initial rust
This commit is contained in:
Thomas Faour
parent
b4d6062640
commit
97cad94f6e
6
.gitignore
vendored
6
.gitignore
vendored
@ -11,3 +11,9 @@ rust/Cargo.lock
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out.out
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output.json
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*.png
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# Added by cargo
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/target
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Cargo.lock
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@ -1,85 +0,0 @@
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cmake_minimum_required(VERSION 3.10)
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project(orbital_simulator)
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set(CMAKE_CXX_STANDARD 23)
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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# Enable testing
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enable_testing()
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include(CTest)
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# Find required packages
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find_package(Boost REQUIRED COMPONENTS program_options)
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find_package(nlohmann_json REQUIRED)
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find_package(GTest REQUIRED)
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# Add source files
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set(SOURCES
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src/main.cpp
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src/body.cpp
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src/calc.cpp
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src/simulator.cpp
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)
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# Add source files for tests (excluding main.cpp)
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set(TEST_SOURCES
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src/body.cpp
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src/calc.cpp
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src/simulator.cpp
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)
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# Add header files
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set(HEADERS
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src/body.hpp
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src/calc.hpp
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src/simulator.hpp
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src/units.hpp
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)
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# Create main executable
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add_executable(orbital_simulator ${SOURCES} ${HEADERS})
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# Create test executable
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add_executable(orbital_simulator_tests
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tests/body_test.cpp
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tests/calc_test.cpp
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tests/simulator_test.cpp
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${TEST_SOURCES} # Use test sources instead of all sources
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)
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# Link libraries for main executable
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target_link_libraries(orbital_simulator
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PRIVATE
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Boost::program_options
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nlohmann_json::nlohmann_json
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)
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# Link libraries for test executable
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target_link_libraries(orbital_simulator_tests
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PRIVATE
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GTest::GTest
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GTest::Main
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)
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# Include directories
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target_include_directories(orbital_simulator
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PRIVATE
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${CMAKE_SOURCE_DIR}/src
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)
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target_include_directories(orbital_simulator_tests
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PRIVATE
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${CMAKE_SOURCE_DIR}/src
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${CMAKE_SOURCE_DIR}/tests
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)
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# Add tests to CTest
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add_test(NAME orbital_simulator_tests COMMAND orbital_simulator_tests)
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# Optional: Enable ncurses for terminal plotting
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option(ENABLE_NCURSES "Enable terminal plotting with ncurses" OFF)
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if(ENABLE_NCURSES)
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find_package(Curses REQUIRED)
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target_compile_definitions(orbital_simulator PRIVATE NCURSES_ENABLED)
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target_link_libraries(orbital_simulator PRIVATE ${CURSES_LIBRARIES})
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endif()
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10
Cargo.toml
Normal file
10
Cargo.toml
Normal file
@ -0,0 +1,10 @@
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[package]
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name = "orbital_simulator"
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version = "0.1.0"
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edition = "2021"
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authors = ["thomas"]
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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clap = { version = "4.5.39", features = ["derive"] }
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83
README.md
83
README.md
@ -1,83 +0,0 @@
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# Orbital Simulator
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A C++ implementation of an N-body orbital simulator with high-precision calculations.
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## Dependencies
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- C++17 compatible compiler
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- CMake 3.10 or higher
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- Boost library (for high-precision decimal arithmetic)
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- Optional: ncurses (for terminal plotting)
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## Building
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1. Create a build directory:
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```bash
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mkdir build
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cd build
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```
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2. Configure with CMake:
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```bash
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cmake ..
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```
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3. Build the project:
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```bash
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make
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```
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To enable terminal plotting with ncurses, configure with:
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```bash
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cmake -DENABLE_NCURSES=ON ..
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```
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## Usage
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The simulator can be used to simulate orbital mechanics with high precision. The main components are:
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- `Body`: Represents a celestial body with position, velocity, and mass
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- `Simulator`: Manages the simulation of multiple bodies
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- `units.hpp`: Contains physical constants and unit conversion utilities
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Example usage:
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```cpp
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#include "simulator.hpp"
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#include "units.hpp"
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int main() {
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// Create bodies
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std::vector<Body> bodies;
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// Earth
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Position earth_pos{Decimal(0), Decimal(0), Decimal(0)};
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Velocity earth_vel{Decimal(0), Decimal(0), Decimal(0)};
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bodies.emplace_back(earth_pos, earth_vel, EARTH_MASS, "Earth");
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// Moon
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Position moon_pos{AU, Decimal(0), Decimal(0)};
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Velocity moon_vel{Decimal(0), MOON_ORBITAL_VELOCITY, Decimal(0)};
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bodies.emplace_back(moon_pos, moon_vel, MOON_MASS, "Moon");
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// Create simulator
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Simulator sim(bodies, 0.1, 100, "output.txt");
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// Run simulation
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sim.run(1000);
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return 0;
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}
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```
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## Features
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- High-precision decimal arithmetic using Boost.Multiprecision
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- N-body gravitational simulation
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- Progress tracking and checkpointing
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- Optional terminal visualization
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- Configurable simulation parameters
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## License
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This project is open source and available under the MIT License.
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201
animate.py
201
animate.py
@ -1,201 +0,0 @@
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#!/usr/bin/env python3
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import numpy as np
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import matplotlib.pyplot as plt
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from matplotlib.animation import FuncAnimation
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from collections import defaultdict
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import argparse
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import re
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def parse_line(line):
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"""Parse a line from the simulation output."""
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# Skip comments and empty lines
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if line.startswith('#') or not line.strip():
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return None
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# Parse the line format: body_name: X = x1m x2m x3m, V = v1m/s v2m/s v3m/s
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try:
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# Split on colon to separate name and data
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name_part, data_part = line.strip().split(':')
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name = name_part.strip()
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# Split data part into position and velocity
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pos_part, vel_part = data_part.split(',')
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# Extract position values
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pos_str = pos_part.split('=')[1].strip()
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pos_values = [float(x.replace('m', '').strip()) for x in pos_str.split() if x.strip()]
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if len(pos_values) != 3:
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return None
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return {
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'name': name,
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'position': tuple(pos_values)
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}
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except (ValueError, IndexError):
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return None
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def read_output_file(filename):
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"""Read the simulation output file and organize data by body and time."""
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positions = defaultdict(list)
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times = [] # We'll use frame numbers as times since actual time isn't in output
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with open(filename, 'r') as f:
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frame = 0
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for line in f:
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data = parse_line(line)
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if data is None:
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continue
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name = data['name']
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pos = data['position']
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# Store position
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positions[name].append((pos[0], pos[1]))
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frame += 1
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times.append(frame)
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return positions, times
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def calculate_l2_point(sun_pos, earth_pos):
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"""Calculate L2 Lagrange point position."""
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# Calculate distance between bodies
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dx = earth_pos[0] - sun_pos[0]
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dy = earth_pos[1] - sun_pos[1]
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r = np.sqrt(dx*dx + dy*dy)
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# Calculate mass ratio (using approximate values)
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mu = 5.972e24 / (1.989e30 + 5.972e24) # Earth mass / (Sun mass + Earth mass)
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# Calculate L2 position (beyond Earth)
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L2_x = sun_pos[0] + (1 + mu**(1/3)) * dx
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L2_y = sun_pos[1] + (1 + mu**(1/3)) * dy
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return (L2_x, L2_y)
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def center_positions(positions, center_body):
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"""Center all positions relative to the specified body."""
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if center_body not in positions:
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print(f"Warning: Center body '{center_body}' not found in simulation")
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return positions
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centered_positions = defaultdict(list)
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for frame in range(len(next(iter(positions.values())))):
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# Get center body position for this frame
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center_pos = positions[center_body][frame]
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# Shift all positions relative to center body
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for name, pos_list in positions.items():
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if frame < len(pos_list):
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pos = pos_list[frame]
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centered_pos = (pos[0] - center_pos[0], pos[1] - center_pos[1])
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centered_positions[name].append(centered_pos)
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return centered_positions
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def create_animation(positions, times, output_file=None, center_body=None):
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"""Create an animation of the bodies' orbits."""
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# Check if we have any data
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if not positions or not times:
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print("Error: No valid data found in the input file")
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return
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# Center positions if requested
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if center_body:
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positions = center_positions(positions, center_body)
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# Set up the figure and axis
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fig, ax = plt.subplots(figsize=(10, 10))
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# Set equal aspect ratio
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ax.set_aspect('equal')
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# Create scatter plots for each body
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scatters = {}
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for name in positions.keys():
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scatters[name], = ax.plot([], [], 'o-', label=name, alpha=0.7)
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# Set up the plot
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ax.set_xlabel('X (m)')
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ax.set_ylabel('Y (m)')
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title = 'Orbital Simulation (L2 centered)'
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ax.set_title(title)
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ax.legend()
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# Find the bounds of the plot
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all_x = []
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all_y = []
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for pos_list in positions.values():
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if pos_list: # Only process if we have positions
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x, y = zip(*pos_list)
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all_x.extend(x)
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all_y.extend(y)
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if not all_x or not all_y:
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print("Error: No valid position data found")
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return
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# Calculate initial L2 point for reference
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if 'Sun' in positions and 'Earth' in positions:
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initial_l2 = calculate_l2_point(positions['Sun'][0], positions['Earth'][0])
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# Set a fixed zoom level around L2 (adjust the factor to change zoom)
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zoom_factor = 2e9 # 2 million km view
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ax.set_xlim(-zoom_factor, zoom_factor)
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ax.set_ylim(-zoom_factor, zoom_factor)
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# Create L2 point scatter plot at origin
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l2_scatter, = ax.plot([0], [0], 'gx', markersize=10, label='L2')
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scatters['L2'] = l2_scatter
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else:
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max_range = max(max(abs(min(all_x)), abs(max(all_x))),
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max(abs(min(all_y)), abs(max(all_y))))
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ax.set_xlim(-max_range, max_range)
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ax.set_ylim(-max_range, max_range)
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def init():
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"""Initialize the animation."""
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for scatter in scatters.values():
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scatter.set_data([], [])
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return list(scatters.values())
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def update(frame):
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"""Update the animation for each frame."""
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if 'Sun' in positions and 'Earth' in positions:
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# Calculate L2 point for current frame
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l2_point = calculate_l2_point(positions['Sun'][frame], positions['Earth'][frame])
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# Update positions relative to L2
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for name, scatter in scatters.items():
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if name == 'L2':
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scatter.set_data([0], [0]) # Keep L2 at origin
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elif positions[name]: # Only update if we have positions
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x, y = zip(*positions[name][:frame+1])
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# Shift positions relative to L2
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x = [pos - l2_point[0] for pos in x]
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y = [pos - l2_point[1] for pos in y]
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scatter.set_data(x, y)
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return list(scatters.values())
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# Create the animation
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anim = FuncAnimation(fig, update, frames=len(times),
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init_func=init, blit=True,
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interval=50) # 50ms between frames
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if output_file:
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anim.save(output_file, writer='ffmpeg', fps=30)
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else:
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plt.show()
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def main():
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parser = argparse.ArgumentParser(description='Animate orbital simulation output')
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parser.add_argument('input_file', help='Input file from simulation')
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parser.add_argument('--output', '-o', help='Output video file (optional)')
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parser.add_argument('--center', '-c', help='Center the animation on this body')
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args = parser.parse_args()
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positions, times = read_output_file(args.input_file)
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create_animation(positions, times, args.output, args.center)
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if __name__ == '__main__':
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main()
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@ -1,158 +0,0 @@
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import json
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import numpy as np
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import matplotlib.pyplot as plt
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from mpl_toolkits.axes_grid1 import make_axes_locatable
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from matplotlib.colors import LogNorm
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# Constants from our Rust implementation
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G = 6.67430e-11 # Gravitational constant
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R_0 = 149597870700 # Earth radius (normalization length)
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M_0 = 5.972e24 # Earth mass (normalization mass)
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T_0 = 5060.0 # Characteristic time
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def load_bodies(config_file):
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"""Load bodies from config file."""
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with open(config_file, 'r') as f:
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data = json.load(f)
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return data['bodies']
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def calculate_potential(x, y, bodies):
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"""Calculate gravitational potential at point (x,y)."""
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potential = 0.0
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for body in bodies:
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dx = x - body['position'][0]
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dy = y - body['position'][1]
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r = np.sqrt(dx*dx + dy*dy)
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if r > 0: # Avoid division by zero
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potential -= G * body['mass'] / r
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return potential
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def calculate_lagrange_points(bodies):
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"""Calculate approximate positions of Lagrange points."""
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if len(bodies) != 2:
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return []
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# Find primary and secondary bodies
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if bodies[0]['mass'] > bodies[1]['mass']:
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primary, secondary = bodies[0], bodies[1]
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else:
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primary, secondary = bodies[1], bodies[0]
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# Calculate distance between bodies
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dx = secondary['position'][0] - primary['position'][0]
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dy = secondary['position'][1] - primary['position'][1]
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r = np.sqrt(dx*dx + dy*dy)
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# Calculate mass ratio
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mu = secondary['mass'] / (primary['mass'] + secondary['mass'])
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# Calculate Lagrange points
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L1 = np.array([primary['position'][0] + (1 - mu**(1/3)) * dx,
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primary['position'][1] + (1 - mu**(1/3)) * dy])
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L2 = np.array([primary['position'][0] + (1 + mu**(1/3)) * dx,
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primary['position'][1] + (1 + mu**(1/3)) * dy])
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L3 = np.array([primary['position'][0] - (1 + 5*mu/12) * dx,
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primary['position'][1] - (1 + 5*mu/12) * dy])
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L4 = np.array([primary['position'][0] + 0.5 * dx - 0.866 * dy,
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primary['position'][1] + 0.5 * dy + 0.866 * dx])
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L5 = np.array([primary['position'][0] + 0.5 * dx + 0.866 * dy,
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primary['position'][1] + 0.5 * dy - 0.866 * dx])
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return [L1, L2, L3, L4, L5]
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def plot_potential(config_file, grid_size=200, extent=1.5):
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"""Plot gravitational potential field."""
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# Load bodies
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bodies = load_bodies(config_file)
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# Find Earth and Sun
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earth = next((body for body in bodies if body['name'] == 'Earth'), None)
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sun = next((body for body in bodies if body['name'] == 'Sun'), None)
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if not (earth and sun):
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print("Error: Earth and Sun must be present in the config file")
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return
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# Calculate Lagrange points for Earth-Sun system
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lagrange_points = calculate_lagrange_points([sun, earth])
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# Create coordinate grid centered on Earth
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x = np.linspace(earth['position'][0] - extent*R_0, earth['position'][0] + extent*R_0, grid_size)
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y = np.linspace(earth['position'][1] - extent*R_0, earth['position'][1] + extent*R_0, grid_size)
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X, Y = np.meshgrid(x, y)
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# Calculate potential at each grid point
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Z = np.zeros_like(X)
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for i in range(grid_size):
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for j in range(grid_size):
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Z[i,j] = calculate_potential(X[i,j], Y[i,j], bodies)
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# Take absolute value for logarithmic scale
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Z_abs = np.abs(Z)
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# Calculate reference potential at Earth's position
|
||||
earth_potential = abs(calculate_potential(earth['position'][0], earth['position'][1], [sun]))
|
||||
|
||||
# Set scale to focus on Earth-Sun system
|
||||
vmin = earth_potential / 10 # Show potential variations within an order of magnitude
|
||||
vmax = earth_potential * 10
|
||||
|
||||
# Create plot
|
||||
plt.figure(figsize=(12, 10))
|
||||
ax = plt.gca()
|
||||
|
||||
# Plot potential field with logarithmic scale
|
||||
im = ax.imshow(Z_abs, extent=[x[0], x[-1], y[0], y[-1]],
|
||||
origin='lower', cmap='viridis', norm=LogNorm(vmin=vmin, vmax=vmax))
|
||||
|
||||
# Add colorbar
|
||||
divider = make_axes_locatable(ax)
|
||||
cax = divider.append_axes("right", size="5%", pad=0.05)
|
||||
plt.colorbar(im, cax=cax, label='|Gravitational Potential| (J/kg)')
|
||||
|
||||
# Plot bodies with different colors
|
||||
body_colors = {
|
||||
'Sun': 'yellow',
|
||||
'Earth': 'blue',
|
||||
'Moon': 'gray',
|
||||
'Mars': 'red',
|
||||
'Venus': 'orange',
|
||||
'Mercury': 'brown',
|
||||
'Jupiter': 'orange',
|
||||
'Saturn': 'gold',
|
||||
'Uranus': 'lightblue',
|
||||
'Neptune': 'blue'
|
||||
}
|
||||
|
||||
for body in bodies:
|
||||
color = body_colors.get(body['name'], 'white') # Default to white if name not found
|
||||
ax.plot(body['position'][0], body['position'][1], 'o',
|
||||
color=color, markersize=15, label=body['name'])
|
||||
|
||||
# Plot Lagrange points
|
||||
for i, point in enumerate(lagrange_points, 1):
|
||||
ax.plot(point[0], point[1], 'r+', markersize=12, label=f'L{i}')
|
||||
|
||||
# Customize plot
|
||||
ax.set_xlabel('X (m)')
|
||||
ax.set_ylabel('Y (m)')
|
||||
ax.set_title('Gravitational Potential Field with Lagrange Points (Log Scale)')
|
||||
ax.legend()
|
||||
|
||||
# Save plot
|
||||
plt.savefig('potential_field.png', dpi=300, bbox_inches='tight')
|
||||
plt.show()
|
||||
|
||||
if __name__ == "__main__":
|
||||
import argparse
|
||||
parser = argparse.ArgumentParser(description='Plot gravitational potential field from config file')
|
||||
parser.add_argument('config_file', help='Path to config file')
|
||||
parser.add_argument('--grid-size', type=int, default=200, help='Grid size for potential calculation')
|
||||
parser.add_argument('--extent', type=float, default=1.5, help='Plot extent in Earth radii')
|
||||
args = parser.parse_args()
|
||||
|
||||
plot_potential(args.config_file, args.grid_size, args.extent)
|
||||
78
src/body.cpp
78
src/body.cpp
@ -1,78 +0,0 @@
|
||||
#include "body.hpp"
|
||||
#include "calc.hpp"
|
||||
#include <cmath>
|
||||
#include <ranges>
|
||||
|
||||
Body::Body(const Position& X, const Velocity& V, const Mass& m, const std::string& name)
|
||||
: X(X), V(V), m(m), name(name) {
|
||||
A = Acceleration{Decimal(0), Decimal(0), Decimal(0)};
|
||||
}
|
||||
|
||||
void Body::addAcceleration(const Acceleration& new_A) {
|
||||
for (const auto& [new_a, cur_a]: std::views::zip(new_A, this->A)){
|
||||
cur_a += new_a;
|
||||
}
|
||||
}
|
||||
|
||||
void Body::subAcceleration(const Acceleration& new_A) {
|
||||
for (const auto& [new_a, cur_a]: std::views::zip(new_A, this->A)){
|
||||
cur_a -= new_a;
|
||||
}
|
||||
}
|
||||
|
||||
std::tuple<Position, Velocity, Mass> Body::save() const {
|
||||
return std::make_tuple(X, V, m);
|
||||
}
|
||||
|
||||
Body Body::load(const std::tuple<Position, Velocity, Mass>& tup) {
|
||||
return Body(std::get<0>(tup), std::get<1>(tup), std::get<2>(tup));
|
||||
}
|
||||
|
||||
void Body::step(Decimal step_size) {
|
||||
for (int i = 0; i < 3; ++i) {
|
||||
X[i] += step_size * V[i];
|
||||
V[i] += step_size * A[i];
|
||||
A[i] = Decimal(0);
|
||||
}
|
||||
}
|
||||
|
||||
Decimal Body::E() const {
|
||||
return ke() + pe();
|
||||
}
|
||||
|
||||
Decimal Body::pe() const {
|
||||
return -m / dist_from_o();
|
||||
}
|
||||
|
||||
Decimal Body::dist_from_o() const {
|
||||
Decimal sum = Decimal(0);
|
||||
for (const auto& x : X) {
|
||||
sum += x * x;
|
||||
}
|
||||
return std::sqrt(sum);
|
||||
}
|
||||
|
||||
Decimal Body::ke() const {
|
||||
return Decimal(0.5) * m * (_speed() * _speed());
|
||||
}
|
||||
|
||||
Decimal Body::_speed() const {
|
||||
Decimal sum = Decimal(0);
|
||||
for (const auto& v : V) {
|
||||
sum += v * v;
|
||||
}
|
||||
return std::sqrt(sum);
|
||||
}
|
||||
|
||||
std::string Body::speed() const {
|
||||
return format_sig_figs(real_vel(_speed()), 5);
|
||||
}
|
||||
|
||||
std::string Body::toString() const {
|
||||
std::string pos_str, vel_str;
|
||||
for (int i = 0; i < 3; ++i) {
|
||||
pos_str += format_sig_figs(real_pos(X[i]), 10) + "m ";
|
||||
vel_str += format_sig_figs(real_vel(V[i]), 10) + "m/s ";
|
||||
}
|
||||
return name + ": X = " + pos_str + ", V = " + vel_str;
|
||||
}
|
||||
48
src/body.hpp
48
src/body.hpp
@ -1,48 +0,0 @@
|
||||
#pragma once
|
||||
|
||||
#include "units.hpp"
|
||||
#include <string>
|
||||
#include <tuple>
|
||||
#include <memory>
|
||||
|
||||
class Body {
|
||||
public:
|
||||
Body(const Position& X, const Velocity& V, const Mass& m,
|
||||
const std::string& name = "");
|
||||
|
||||
// Save and load state
|
||||
std::tuple<Position, Velocity, Mass> save() const;
|
||||
static Body load(const std::tuple<Position, Velocity, Mass>& tup);
|
||||
|
||||
// Physics calculations
|
||||
void step(Decimal step_size);
|
||||
Decimal E() const; // Total energy
|
||||
Decimal pe() const; // Potential energy
|
||||
Decimal ke() const; // Kinetic energy
|
||||
Decimal dist_from_o() const; // Distance from origin
|
||||
std::string speed() const; // Speed as formatted string
|
||||
|
||||
// Getters
|
||||
const Position& getPosition() const { return X; }
|
||||
const Velocity& getVelocity() const { return V; }
|
||||
const Acceleration& getAcceleration() const { return A; }
|
||||
const Mass& getMass() const { return m; }
|
||||
const std::string& getName() const { return name; }
|
||||
|
||||
// Setters
|
||||
void setAcceleration(const Acceleration& new_A) { A = new_A; }
|
||||
|
||||
void addAcceleration(const Acceleration& new_A);
|
||||
void subAcceleration(const Acceleration& new_A);
|
||||
// String representation
|
||||
std::string toString() const;
|
||||
|
||||
private:
|
||||
Position X;
|
||||
Velocity V;
|
||||
Acceleration A;
|
||||
Mass m;
|
||||
std::string name;
|
||||
|
||||
Decimal _speed() const; // Internal speed calculation
|
||||
};
|
||||
147
src/calc.cpp
147
src/calc.cpp
@ -1,147 +0,0 @@
|
||||
#include "calc.hpp"
|
||||
#include <cmath>
|
||||
#include <iostream>
|
||||
#include <iomanip>
|
||||
#include <sstream>
|
||||
#include <boost/multiprecision/cpp_dec_float.hpp>
|
||||
|
||||
std::vector<std::vector<Decimal>> calculate_distances(const std::vector<Position>& positions) {
|
||||
int N = positions.size();
|
||||
std::vector<std::vector<Decimal>> dists(N, std::vector<Decimal>(N, Decimal(0)));
|
||||
|
||||
for (int i = 0; i < N; ++i) {
|
||||
for (int j = i + 1; j < N; ++j) {
|
||||
Decimal sum = Decimal(0);
|
||||
for (int k = 0; k < 3; ++k) {
|
||||
Decimal diff = positions[i][k] - positions[j][k];
|
||||
sum += diff * diff;
|
||||
}
|
||||
Decimal d = std::sqrt(sum);
|
||||
dists[i][j] = d;
|
||||
dists[j][i] = d;
|
||||
}
|
||||
}
|
||||
return dists;
|
||||
}
|
||||
|
||||
std::string format_sig_figs(Decimal value, int sig_figs) {
|
||||
if (value == 0) {
|
||||
return "0";
|
||||
}
|
||||
|
||||
std::stringstream ss;
|
||||
ss << std::scientific << std::setprecision(sig_figs - 1) << value;
|
||||
return ss.str();
|
||||
}
|
||||
|
||||
void print_progress_bar(int iteration, int total, std::chrono::time_point<std::chrono::steady_clock> start_time, int length, Decimal step_size) {
|
||||
float percent = (float)iteration / total * 100;
|
||||
int filled_length = length * iteration / total;
|
||||
|
||||
std::string bar;
|
||||
bar.reserve(length + 1);
|
||||
bar += '[';
|
||||
bar.append(filled_length, '#');
|
||||
bar.append(length - filled_length, '-');
|
||||
bar += ']';
|
||||
|
||||
auto now = std::chrono::steady_clock::now();
|
||||
auto elapsed = std::chrono::duration_cast<std::chrono::seconds>(now - start_time).count();
|
||||
double steps_per_second = elapsed > 0 ? real_time(Decimal(iteration) * step_size) / elapsed : 0;
|
||||
|
||||
// Determine appropriate time unit
|
||||
std::string time_unit;
|
||||
if (steps_per_second >= 3600) {
|
||||
time_unit = "hour/s";
|
||||
steps_per_second /= 3600;
|
||||
} else if (steps_per_second >= 60) {
|
||||
time_unit = "min/s";
|
||||
steps_per_second /= 60;
|
||||
} else {
|
||||
time_unit = "s/s";
|
||||
}
|
||||
|
||||
// Clear the current line and move cursor to start
|
||||
std::cout << "\r\033[K";
|
||||
|
||||
// Print the progress bar
|
||||
std::cout << bar << " " << std::fixed << std::setprecision(2)
|
||||
<< percent << "% " << std::setprecision(1) << steps_per_second << " " << time_unit << std::flush;
|
||||
}
|
||||
|
||||
#ifdef NCURSES_ENABLED
|
||||
void plot_points_terminal(const std::vector<Position>& vectors, WINDOW* stdscr,
|
||||
Decimal scale, int grid_width, int grid_height) {
|
||||
if (vectors.empty()) {
|
||||
mvwaddstr(stdscr, 0, 0, "No vectors provided.");
|
||||
wrefresh(stdscr);
|
||||
return;
|
||||
}
|
||||
|
||||
// Scale and round vectors
|
||||
std::vector<std::pair<int, int>> scaled_vectors;
|
||||
for (const auto& vec : vectors) {
|
||||
scaled_vectors.emplace_back(
|
||||
std::round(vec[0] / scale),
|
||||
std::round(vec[1] / scale)
|
||||
);
|
||||
}
|
||||
|
||||
// Find bounds
|
||||
int min_x = scaled_vectors[0].first;
|
||||
int max_x = min_x;
|
||||
int min_y = scaled_vectors[0].second;
|
||||
int max_y = min_y;
|
||||
|
||||
for (const auto& vec : scaled_vectors) {
|
||||
min_x = std::min(min_x, vec.first);
|
||||
max_x = std::max(max_x, vec.first);
|
||||
min_y = std::min(min_y, vec.second);
|
||||
max_y = std::max(max_y, vec.second);
|
||||
}
|
||||
|
||||
// Center offsets
|
||||
int center_x = (grid_width / 2) - min_x;
|
||||
int center_y = (grid_height / 2) - min_y;
|
||||
|
||||
// Adjust coordinates
|
||||
std::vector<std::pair<int, int>> adjusted_vectors;
|
||||
for (const auto& vec : scaled_vectors) {
|
||||
adjusted_vectors.emplace_back(
|
||||
vec.first + center_x,
|
||||
vec.second + center_y
|
||||
);
|
||||
}
|
||||
|
||||
// Get terminal bounds
|
||||
int max_terminal_y, max_terminal_x;
|
||||
getmaxyx(stdscr, max_terminal_y, max_terminal_x);
|
||||
max_x = std::min(grid_width, max_terminal_x - 5);
|
||||
max_y = std::min(grid_height, max_terminal_y - 5);
|
||||
|
||||
// Draw grid
|
||||
for (int i = grid_height; i >= 0; --i) {
|
||||
std::string row = std::to_string(i - center_y) + " | ";
|
||||
for (int j = 0; j <= grid_width; ++j) {
|
||||
bool has_point = false;
|
||||
for (const auto& vec : adjusted_vectors) {
|
||||
if (vec.first == j && vec.second == i) {
|
||||
has_point = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
row += has_point ? "● " : ". ";
|
||||
}
|
||||
mvwaddstr(stdscr, max_y - i, 0, row.substr(0, max_terminal_x - 1).c_str());
|
||||
}
|
||||
|
||||
// Print X-axis labels
|
||||
std::string x_labels = " ";
|
||||
for (int j = 0; j <= max_x; ++j) {
|
||||
x_labels += std::to_string(j - center_x) + " ";
|
||||
}
|
||||
mvwaddstr(stdscr, max_y + 1, 0, x_labels.substr(0, max_terminal_x - 1).c_str());
|
||||
|
||||
wrefresh(stdscr);
|
||||
}
|
||||
#endif
|
||||
22
src/calc.hpp
22
src/calc.hpp
@ -1,22 +0,0 @@
|
||||
#pragma once
|
||||
|
||||
#include "units.hpp"
|
||||
#include <vector>
|
||||
#include <string>
|
||||
#include <chrono>
|
||||
|
||||
// Calculate distances between all bodies
|
||||
std::vector<std::vector<Decimal>> calculate_distances(const std::vector<Position>& positions);
|
||||
|
||||
// Format a number to a specified number of significant figures
|
||||
std::string format_sig_figs(Decimal value, int sig_figs);
|
||||
|
||||
// Print progress bar
|
||||
void print_progress_bar(int iteration, int total, std::chrono::time_point<std::chrono::steady_clock> start_time, int length, Decimal step_size);
|
||||
|
||||
// Terminal plotting functions (if needed)
|
||||
#ifdef NCURSES_ENABLED
|
||||
#include <ncurses.h>
|
||||
void plot_points_terminal(const std::vector<Position>& vectors, WINDOW* stdscr,
|
||||
Decimal scale = 500000, int grid_width = 30, int grid_height = 30);
|
||||
#endif
|
||||
167
src/main.cpp
167
src/main.cpp
@ -1,167 +0,0 @@
|
||||
#include <iostream>
|
||||
#include <fstream>
|
||||
#include <string>
|
||||
#include <vector>
|
||||
#include <boost/program_options.hpp>
|
||||
#include <nlohmann/json.hpp>
|
||||
#include "simulator.hpp"
|
||||
#include "body.hpp"
|
||||
#include "units.hpp"
|
||||
|
||||
using json = nlohmann::json;
|
||||
namespace po = boost::program_options;
|
||||
|
||||
struct SimulationConfig {
|
||||
std::string config_file;
|
||||
std::string output_file;
|
||||
int steps;
|
||||
int steps_per_save;
|
||||
Decimal step_size; // Changed to Decimal for normalized time
|
||||
bool overwrite_output;
|
||||
double simulation_time; // in seconds (real time)
|
||||
};
|
||||
|
||||
// Convert time string to seconds
|
||||
double parse_time(const std::string& time_str) {
|
||||
std::string value_str = time_str;
|
||||
std::string unit;
|
||||
|
||||
// Extract the unit (last character)
|
||||
if (!time_str.empty()) {
|
||||
unit = time_str.back();
|
||||
value_str = time_str.substr(0, time_str.length() - 1);
|
||||
}
|
||||
|
||||
double value = std::stod(value_str);
|
||||
|
||||
// Convert to seconds based on unit
|
||||
switch (unit[0]) {
|
||||
case 's': return value; // seconds
|
||||
case 'm': return value * 60; // minutes
|
||||
case 'h': return value * 3600; // hours
|
||||
case 'd': return value * 86400; // days
|
||||
default: throw std::runtime_error("Invalid time unit. Use s/m/h/d for seconds/minutes/hours/days");
|
||||
}
|
||||
}
|
||||
|
||||
SimulationConfig parse_command_line(int argc, char* argv[]) {
|
||||
SimulationConfig config;
|
||||
double temp_step_size; // Temporary variable for parsing
|
||||
|
||||
po::options_description desc("Orbital Simulator Options");
|
||||
desc.add_options()
|
||||
("help,h", "Show help message")
|
||||
("config,c", po::value<std::string>(&config.config_file)->required(),
|
||||
"Path to body configuration file (JSON)")
|
||||
("output,o", po::value<std::string>(&config.output_file)->required(),
|
||||
"Path to output file")
|
||||
("time,t", po::value<std::string>()->required(),
|
||||
"Simulation time with unit (e.g., 1h for 1 hour, 30m for 30 minutes, 2d for 2 days)")
|
||||
("step-size,s", po::value<double>(&temp_step_size)->default_value(1.0),
|
||||
"Simulation step size in seconds")
|
||||
("steps-per-save,p", po::value<int>(&config.steps_per_save)->default_value(100),
|
||||
"Number of steps between saves")
|
||||
("overwrite,w", po::bool_switch(&config.overwrite_output),
|
||||
"Overwrite output file if it exists");
|
||||
|
||||
po::variables_map vm;
|
||||
try {
|
||||
po::store(po::parse_command_line(argc, argv, desc), vm);
|
||||
|
||||
if (vm.count("help")) {
|
||||
std::cout << desc << "\n";
|
||||
exit(0);
|
||||
}
|
||||
|
||||
po::notify(vm);
|
||||
|
||||
// Parse simulation time
|
||||
config.simulation_time = parse_time(vm["time"].as<std::string>());
|
||||
|
||||
// Convert step size to Decimal and normalize
|
||||
config.step_size = norm_time(Decimal(temp_step_size));
|
||||
|
||||
// Calculate number of steps based on normalized time and step size
|
||||
config.steps = static_cast<int>(norm_time(config.simulation_time) / config.step_size);
|
||||
|
||||
} catch (const po::error& e) {
|
||||
std::cerr << "Error: " << e.what() << "\n";
|
||||
std::cerr << desc << "\n";
|
||||
exit(1);
|
||||
} catch (const std::exception& e) {
|
||||
std::cerr << "Error: " << e.what() << "\n";
|
||||
std::cerr << desc << "\n";
|
||||
exit(1);
|
||||
}
|
||||
|
||||
return config;
|
||||
}
|
||||
|
||||
std::vector<Body> load_bodies(const std::string& config_file) {
|
||||
std::ifstream f(config_file);
|
||||
if (!f.is_open()) {
|
||||
throw std::runtime_error("Could not open config file: " + config_file);
|
||||
}
|
||||
|
||||
json j;
|
||||
f >> j;
|
||||
|
||||
std::vector<Body> bodies;
|
||||
for (const auto& body : j["bodies"]) {
|
||||
std::string name = body["name"];
|
||||
double mass = body["mass"];
|
||||
|
||||
std::vector<double> pos = body["position"];
|
||||
std::vector<double> vel = body["velocity"];
|
||||
|
||||
if (pos.size() != 3 || vel.size() != 3) {
|
||||
throw std::runtime_error("Position and velocity must be 3D vectors");
|
||||
}
|
||||
|
||||
// Normalize units before creating the body
|
||||
Position position{norm_pos(pos[0]), norm_pos(pos[1]), norm_pos(pos[2])};
|
||||
Velocity velocity{norm_vel(vel[0]), norm_vel(vel[1]), norm_vel(vel[2])};
|
||||
Mass normalized_mass = norm_mass(mass);
|
||||
|
||||
bodies.emplace_back(position, velocity, normalized_mass, name);
|
||||
|
||||
std::cout << "Loaded " << name << " with mass " << mass << " kg\n";
|
||||
}
|
||||
|
||||
return bodies;
|
||||
}
|
||||
|
||||
int main(int argc, char* argv[]) {
|
||||
try {
|
||||
// Parse command line options
|
||||
auto config = parse_command_line(argc, argv);
|
||||
|
||||
// Load bodies from config file
|
||||
auto bodies = load_bodies(config.config_file);
|
||||
|
||||
// Create and run simulator
|
||||
Simulator simulator(
|
||||
bodies,
|
||||
config.step_size,
|
||||
config.steps_per_save,
|
||||
config.output_file,
|
||||
0, // current_step
|
||||
config.overwrite_output
|
||||
);
|
||||
|
||||
std::cout << "Starting simulation with " << bodies.size() << " bodies\n";
|
||||
std::cout << "Step size: " << real_time(config.step_size) << " seconds\n";
|
||||
std::cout << "Simulation time: " << config.simulation_time << " seconds\n";
|
||||
std::cout << "Total steps: " << config.steps << "\n";
|
||||
std::cout << "Steps per save: " << config.steps_per_save << "\n";
|
||||
|
||||
simulator.run(config.steps);
|
||||
|
||||
std::cout << "Simulation completed successfully\n";
|
||||
return 0;
|
||||
|
||||
} catch (const std::exception& e) {
|
||||
std::cerr << "Error: " << e.what() << std::endl;
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
25
src/main.rs
Normal file
25
src/main.rs
Normal file
@ -0,0 +1,25 @@
|
||||
use clap::Parser;
|
||||
|
||||
|
||||
#[derive(Parser, Debug)]
|
||||
#[command(
|
||||
version,
|
||||
about="Orbital mechanics simulator",
|
||||
long_about = "Given initial conditions you provide to --config, \
|
||||
this program will numerically integrate and determinate their \
|
||||
paths based off Newton's law of gravity.")]
|
||||
struct Args {
|
||||
///Config file for initial conditions
|
||||
#[arg(short, long)]
|
||||
config: String,
|
||||
|
||||
///Step size for simulation (seconds)
|
||||
#[arg(short, long, default_value_t = 10)]
|
||||
step_size: u8,
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let args = Args::parse();
|
||||
|
||||
println!("Loading initial parameters from {}", args.config);
|
||||
}
|
||||
@ -1,121 +0,0 @@
|
||||
#include "simulator.hpp"
|
||||
#include "calc.hpp"
|
||||
#include <fstream>
|
||||
#include <chrono>
|
||||
#include <iostream>
|
||||
#include <stdexcept>
|
||||
|
||||
Simulator::Simulator(const std::vector<Body>& bodies,
|
||||
Decimal step_size,
|
||||
int steps_per_save,
|
||||
const std::filesystem::path& output_file,
|
||||
int current_step,
|
||||
bool overwrite_output)
|
||||
: bodies(bodies),
|
||||
step_size(step_size),
|
||||
steps_per_save(steps_per_save),
|
||||
output_file(output_file),
|
||||
current_step(current_step) {
|
||||
|
||||
if (std::filesystem::exists(output_file) && !overwrite_output) {
|
||||
throw std::runtime_error("File " + output_file.string() + " exists and overwrite flag not given.");
|
||||
}
|
||||
|
||||
if (std::filesystem::exists(output_file) && overwrite_output) {
|
||||
std::cout << "Warning! Overwriting file: " << output_file.string() << std::endl;
|
||||
// Clear the file if we're overwriting
|
||||
std::ofstream clear(output_file, std::ios::trunc);
|
||||
clear.close();
|
||||
}
|
||||
|
||||
out.open(output_file, std::ios::app);
|
||||
if (!out) {
|
||||
throw std::runtime_error("Failed to open output file: " + output_file.string());
|
||||
}
|
||||
|
||||
for (const auto& body : bodies) {
|
||||
out << body.getName() << ": mass=" << body.getMass();
|
||||
out << "\n";
|
||||
}
|
||||
out << "\n";
|
||||
|
||||
// Write initial state
|
||||
checkpoint();
|
||||
}
|
||||
|
||||
Simulator Simulator::from_checkpoint(const std::filesystem::path& output_file) {
|
||||
// TODO: Implement checkpoint loading
|
||||
// This would require implementing a binary format for saving/loading checkpoints
|
||||
throw std::runtime_error("Checkpoint loading not implemented yet");
|
||||
}
|
||||
|
||||
void Simulator::run(int steps) {
|
||||
auto start_time = std::chrono::steady_clock::now();
|
||||
|
||||
for (int i = 0; i < steps; ++i) {
|
||||
calculate_forces();
|
||||
move_bodies();
|
||||
if (i % steps_per_save == 0) {
|
||||
checkpoint();
|
||||
print_progress_bar(i + 1, steps, start_time, 50, step_size);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void Simulator::calculate_forces() {
|
||||
std::vector<Position> positions;
|
||||
positions.reserve(bodies.size());
|
||||
for (const auto& body : bodies) {
|
||||
positions.push_back(body.getPosition());
|
||||
}
|
||||
|
||||
auto dists = calculate_distances(positions);
|
||||
|
||||
// Reset all accelerations to zero
|
||||
for (auto& body : bodies) {
|
||||
body.setAcceleration(Acceleration{Decimal(0), Decimal(0), Decimal(0)});
|
||||
}
|
||||
|
||||
for (size_t i = 0; i < bodies.size(); i++) {
|
||||
for (size_t j = i + 1; j < bodies.size(); j++) {
|
||||
Position vec;
|
||||
for (int k = 0; k < 3; ++k) {
|
||||
vec[k] = positions[i][k] - positions[j][k];
|
||||
}
|
||||
|
||||
Decimal dist = std::sqrt(vec[0] * vec[0] + vec[1] * vec[1] + vec[2] * vec[2]);
|
||||
|
||||
// Calculate force magnitude using Newton's law of gravitation
|
||||
// F = G * m1 * m2 / r^2 BUT G = 1, and we'll multiply by the opposite mass later
|
||||
// for the acceleration. Use r^3 to avoid normalizing vec when multiplying later
|
||||
Decimal force_magnitude = 1 / (dist * dist * dist);
|
||||
|
||||
Decimal acc_magnitude_i = force_magnitude * bodies[j].getMass();
|
||||
Decimal acc_magnitude_j = force_magnitude * bodies[i].getMass();
|
||||
|
||||
// Convert to vector form
|
||||
Acceleration acc_i, acc_j;
|
||||
for (int k = 0; k < 3; ++k) {
|
||||
acc_i[k] = -vec[k] * acc_magnitude_i;
|
||||
acc_j[k] = vec[k] * acc_magnitude_j;
|
||||
}
|
||||
|
||||
bodies[i].addAcceleration(acc_i);
|
||||
bodies[j].addAcceleration(acc_j);
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
void Simulator::move_bodies() {
|
||||
for (auto& body : bodies) {
|
||||
body.step(step_size);
|
||||
}
|
||||
}
|
||||
|
||||
void Simulator::checkpoint() {
|
||||
for (const auto& body : bodies) {
|
||||
out << body.toString() << "\n";
|
||||
}
|
||||
out.flush();
|
||||
}
|
||||
@ -1,43 +0,0 @@
|
||||
#pragma once
|
||||
|
||||
#include "body.hpp"
|
||||
#include <vector>
|
||||
#include <string>
|
||||
#include <filesystem>
|
||||
#include <memory>
|
||||
#include <fstream>
|
||||
|
||||
class Simulator {
|
||||
public:
|
||||
Simulator(const std::vector<Body>& bodies,
|
||||
Decimal step_size,
|
||||
int steps_per_save,
|
||||
const std::filesystem::path& output_file,
|
||||
int current_step = 0,
|
||||
bool overwrite_output = false);
|
||||
|
||||
// Create simulator from checkpoint
|
||||
static Simulator from_checkpoint(const std::filesystem::path& output_file);
|
||||
|
||||
// Run simulation
|
||||
void run(int steps);
|
||||
|
||||
// Getters
|
||||
const std::vector<Body>& getBodies() const { return bodies; }
|
||||
Decimal getStepSize() const { return step_size; }
|
||||
int getStepsPerSave() const { return steps_per_save; }
|
||||
const std::filesystem::path& getOutputFile() const { return output_file; }
|
||||
int getCurrentStep() const { return current_step; }
|
||||
|
||||
private:
|
||||
void calculate_forces();
|
||||
void move_bodies();
|
||||
void checkpoint();
|
||||
|
||||
std::vector<Body> bodies;
|
||||
Decimal step_size;
|
||||
int steps_per_save;
|
||||
std::filesystem::path output_file;
|
||||
std::ofstream out;
|
||||
int current_step;
|
||||
};
|
||||
@ -1,46 +0,0 @@
|
||||
#pragma once
|
||||
|
||||
#include <array>
|
||||
#include <string>
|
||||
#include <cmath>
|
||||
//#include <boost/multiprecision/cpp_dec_float.hpp>
|
||||
|
||||
using Decimal = long double; //boost::multiprecision::cpp_dec_float_50;
|
||||
|
||||
// Type aliases for clarity
|
||||
using Position = std::array<Decimal, 3>;
|
||||
using Velocity = std::array<Decimal, 3>;
|
||||
using Acceleration = std::array<Decimal, 3>;
|
||||
using Mass = Decimal;
|
||||
|
||||
// Constants
|
||||
const Decimal EARTH_MASS = 5972e21;//Decimal("5972e21"); // kg
|
||||
const Decimal EARTH_RADIUS = 6378e3;//Decimal("6378e3"); // meters
|
||||
const Decimal EARTH_ORBITAL_VELOCITY = 29780;//Decimal("29780"); // m/s
|
||||
const Decimal AU = 149597870700;//Decimal("149597870700"); // meters
|
||||
|
||||
const Decimal MOON_MASS = 734767309e14;//Decimal("734767309e14");
|
||||
const Decimal MOON_ORBITAL_VELOCITY = 1022;//Decimal("1022"); // m/s relative to earth
|
||||
|
||||
const Decimal SUN_MASS = 1989e27;//Decimal("1989e27"); // kg
|
||||
const Decimal SUN_RADIUS = 6957e5;//Decimal("6957e5"); // meters
|
||||
|
||||
const Decimal PI = 3.14159265358979323846264338327950288419716939937510;
|
||||
|
||||
// Normalizing constants
|
||||
const Decimal G = 6.67430e-11;
|
||||
const Decimal r_0 = EARTH_RADIUS;
|
||||
const Decimal m_0 = 5.972e24;
|
||||
const Decimal t_0 = std::sqrt((r_0 * r_0 * r_0) / (G * m_0));
|
||||
|
||||
// Utility functions
|
||||
inline Decimal norm_pos(Decimal pos) { return pos / r_0; }
|
||||
inline Decimal real_pos(Decimal pos) { return pos * r_0; }
|
||||
inline Decimal norm_mass(Decimal mass) { return mass / m_0; }
|
||||
inline Decimal real_mass(Decimal mass) { return mass * m_0; }
|
||||
inline Decimal norm_time(Decimal time) { return time / t_0; }
|
||||
inline Decimal real_time(Decimal time) { return time * t_0; }
|
||||
inline Decimal norm_vel(Decimal vel) { return vel / (r_0/t_0); }
|
||||
inline Decimal real_vel(Decimal vel) { return vel * (r_0/t_0); }
|
||||
inline Decimal norm_acc(Decimal acc) { return acc / (r_0/(t_0*t_0)); }
|
||||
inline Decimal real_acc(Decimal acc) { return acc * (r_0/(t_0*t_0)); }
|
||||
44
test.py
44
test.py
@ -1,44 +0,0 @@
|
||||
from orbiter.orbits.body import Body
|
||||
from orbiter.orbits.simulator import Simulator
|
||||
from orbiter.units import *
|
||||
|
||||
from pathlib import Path
|
||||
from decimal import Decimal, getcontext
|
||||
|
||||
getcontext().prec = 50
|
||||
|
||||
#set up the earth
|
||||
earth = Body(
|
||||
Position([0,0,0]),
|
||||
Velocity([0,0,0]),
|
||||
Mass(norm_mass(EARTH_MASS)),
|
||||
"Earth"
|
||||
)
|
||||
|
||||
r = EARTH_RADIUS+100_000
|
||||
#Lets try a body just outside earth accelerating in. Should be 9.8m/s2
|
||||
person = Body(
|
||||
Position([norm_pos(r),0,0]), #10_000m in the sky, airliner height!
|
||||
Velocity([0,(Decimal(0.5)/norm_pos(r)).sqrt(),0]), #orbital velocity
|
||||
Mass(norm_mass(80)), #avg person
|
||||
"Person"
|
||||
)
|
||||
|
||||
T = 2*pi_approx*norm_pos(r)/person.V[1]
|
||||
|
||||
time_to_run = T*3 #norm_time(2000)
|
||||
STEP_SIZE = Decimal(6e-4)
|
||||
n_steps = int(time_to_run/STEP_SIZE)
|
||||
|
||||
def main():
|
||||
print("Before: ")
|
||||
print(str(person))
|
||||
print(str(earth))
|
||||
import cProfile
|
||||
s = Simulator([earth,person], STEP_SIZE, 100, Path("hello_world"))
|
||||
cProfile.run(s.run(n_steps))
|
||||
print("\nAfter:")
|
||||
print(str(person))
|
||||
print(str(earth))
|
||||
|
||||
main()
|
||||
@ -1,111 +0,0 @@
|
||||
#include <gtest/gtest.h>
|
||||
#include "body.hpp"
|
||||
#include <cmath>
|
||||
#include <memory>
|
||||
|
||||
class BodyTest : public testing::Test {
|
||||
protected:
|
||||
BodyTest() {
|
||||
test_body = std::make_unique<Body>(
|
||||
Position{Decimal(0), Decimal(0), Decimal(0)},
|
||||
Velocity{Decimal(0), Decimal(0), Decimal(0)},
|
||||
Mass(1.0),
|
||||
"test_body"
|
||||
);
|
||||
}
|
||||
|
||||
std::unique_ptr<Body> test_body;
|
||||
};
|
||||
|
||||
TEST_F(BodyTest, AddAcceleration) {
|
||||
Acceleration new_A{Decimal(1.0), Decimal(2.0), Decimal(3.0)};
|
||||
test_body->addAcceleration(new_A);
|
||||
|
||||
const auto& A = test_body->getAcceleration();
|
||||
EXPECT_DOUBLE_EQ(A[0], 1.0);
|
||||
EXPECT_DOUBLE_EQ(A[1], 2.0);
|
||||
EXPECT_DOUBLE_EQ(A[2], 3.0);
|
||||
|
||||
// Add another acceleration
|
||||
Acceleration another_A{Decimal(2.0), Decimal(3.0), Decimal(4.0)};
|
||||
test_body->addAcceleration(another_A);
|
||||
|
||||
EXPECT_DOUBLE_EQ(A[0], 3.0);
|
||||
EXPECT_DOUBLE_EQ(A[1], 5.0);
|
||||
EXPECT_DOUBLE_EQ(A[2], 7.0);
|
||||
}
|
||||
|
||||
TEST_F(BodyTest, Step) {
|
||||
// Set initial velocity and acceleration
|
||||
test_body->setAcceleration(Acceleration{Decimal(1.0), Decimal(2.0), Decimal(3.0)});
|
||||
|
||||
// Take a step
|
||||
test_body->step(1.0);
|
||||
|
||||
// Check new position
|
||||
const auto& X = test_body->getPosition();
|
||||
EXPECT_DOUBLE_EQ(X[0], 0.0);
|
||||
EXPECT_DOUBLE_EQ(X[1], 0.0);
|
||||
EXPECT_DOUBLE_EQ(X[2], 0.0);
|
||||
|
||||
// Check new velocity
|
||||
const auto& V = test_body->getVelocity();
|
||||
EXPECT_DOUBLE_EQ(V[0], 1.0);
|
||||
EXPECT_DOUBLE_EQ(V[1], 2.0);
|
||||
EXPECT_DOUBLE_EQ(V[2], 3.0);
|
||||
|
||||
// Check acceleration is reset
|
||||
const auto& A = test_body->getAcceleration();
|
||||
EXPECT_DOUBLE_EQ(A[0], 0.0);
|
||||
EXPECT_DOUBLE_EQ(A[1], 0.0);
|
||||
EXPECT_DOUBLE_EQ(A[2], 0.0);
|
||||
|
||||
}
|
||||
|
||||
TEST_F(BodyTest, Energy) {
|
||||
// Set position and velocity through save/load
|
||||
auto state = std::make_tuple(
|
||||
Position{Decimal(1.0), Decimal(0.0), Decimal(0.0)},
|
||||
Velocity{Decimal(1.0), Decimal(0.0), Decimal(0.0)},
|
||||
Mass(1.0)
|
||||
);
|
||||
test_body = std::make_unique<Body>(Body::load(state));
|
||||
|
||||
// Calculate expected values
|
||||
Decimal expected_ke = Decimal(0.5); // 0.5 * m * v^2
|
||||
Decimal expected_pe = Decimal(-1.0); // -m/r
|
||||
Decimal expected_total = expected_ke + expected_pe;
|
||||
|
||||
EXPECT_DOUBLE_EQ(test_body->ke(), expected_ke);
|
||||
EXPECT_DOUBLE_EQ(test_body->pe(), expected_pe);
|
||||
EXPECT_DOUBLE_EQ(test_body->E(), expected_total);
|
||||
}
|
||||
|
||||
TEST_F(BodyTest, SaveAndLoad) {
|
||||
// Set some values through save/load
|
||||
auto state = std::make_tuple(
|
||||
Position{Decimal(1.0), Decimal(2.0), Decimal(3.0)},
|
||||
Velocity{Decimal(4.0), Decimal(5.0), Decimal(6.0)},
|
||||
Mass(7.0)
|
||||
);
|
||||
test_body = std::make_unique<Body>(Body::load(state));
|
||||
|
||||
// Save state
|
||||
auto saved_state = test_body->save();
|
||||
|
||||
// Create new body from saved state
|
||||
Body loaded_body = Body::load(saved_state);
|
||||
|
||||
// Verify loaded values
|
||||
const auto& X = loaded_body.getPosition();
|
||||
const auto& V = loaded_body.getVelocity();
|
||||
const auto& m = loaded_body.getMass();
|
||||
|
||||
EXPECT_DOUBLE_EQ(X[0], 1.0);
|
||||
EXPECT_DOUBLE_EQ(X[1], 2.0);
|
||||
EXPECT_DOUBLE_EQ(X[2], 3.0);
|
||||
EXPECT_DOUBLE_EQ(V[0], 4.0);
|
||||
EXPECT_DOUBLE_EQ(V[1], 5.0);
|
||||
EXPECT_DOUBLE_EQ(V[2], 6.0);
|
||||
EXPECT_DOUBLE_EQ(m, 7.0);
|
||||
}
|
||||
@ -1,10 +0,0 @@
|
||||
#include <gtest/gtest.h>
|
||||
#include "calc.hpp"
|
||||
#include <cmath>
|
||||
|
||||
TEST(CalcTest, FormatSigFigs) {
|
||||
// Test positive numbers
|
||||
EXPECT_EQ(format_sig_figs(123.456, 3), "1.23e+02");
|
||||
EXPECT_EQ(format_sig_figs(123.456, 4), "1.235e+02");
|
||||
EXPECT_EQ(format_sig_figs(123.456, 5), "1.2346e+02");
|
||||
}
|
||||
@ -1,54 +0,0 @@
|
||||
// #include <gtest/gtest.h>
|
||||
// #include "simulator.hpp"
|
||||
// #include <vector>
|
||||
// #include <filesystem>
|
||||
// #include <memory>
|
||||
|
||||
// class SimulatorTest : public testing::Test {
|
||||
// protected:
|
||||
// SimulatorTest() :
|
||||
// bodies({
|
||||
// Body(
|
||||
// Position{Decimal(0), Decimal(0), Decimal(0)},
|
||||
// Velocity{Decimal(0), Decimal(0), Decimal(0)},
|
||||
// Mass(1.0),
|
||||
// "body1"
|
||||
// ),
|
||||
// Body(
|
||||
// Position{Decimal(1), Decimal(0), Decimal(0)},
|
||||
// Velocity{Decimal(0), Decimal(1), Decimal(0)},
|
||||
// Mass(1.0),
|
||||
// "body2"
|
||||
// )
|
||||
// })
|
||||
// {
|
||||
// simulator = std::make_unique<Simulator>(
|
||||
// bodies,
|
||||
// Decimal(0.1), // step_size
|
||||
// 1, // steps_per_save
|
||||
// std::filesystem::path("test_output.json"), // output_file
|
||||
// 0, // current_step
|
||||
// true // overwrite_output
|
||||
// );
|
||||
// }
|
||||
|
||||
// std::vector<Body> bodies;
|
||||
// std::unique_ptr<Simulator> simulator;
|
||||
// };
|
||||
|
||||
// TEST_F(SimulatorTest, Step) {
|
||||
// // Take a step
|
||||
// //TODO
|
||||
// }
|
||||
|
||||
// TEST_F(SimulatorTest, TotalEnergy) {
|
||||
// //TODO
|
||||
// // Decimal initial_energy = simulator->total_energy();
|
||||
|
||||
// // simulator->step(Decimal(0.1));
|
||||
|
||||
// // Decimal new_energy = simulator->total_energy();
|
||||
|
||||
// // EXPECT_NEAR(initial_energy, new_energy, 1e-10);
|
||||
// }
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user