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Linux0HatLinux0Hat
committedOct 16, 2024
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‎.gitignore

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/target
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/node_modules

‎Cargo.lock

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‎Cargo.toml

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[package]
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name = "physicium"
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version = "0.1.0"
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authors = ["Adrien de Joux <adrien@d4x.fr>"]
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edition = "2021"
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[lib]
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crate-type = ["cdylib"]
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[dependencies]
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wasm-bindgen = "0.2"
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js-sys = "0.3"
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[dependencies.web-sys]
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version = "0.3"
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features = ['CanvasRenderingContext2d', 'Document', 'Element', 'HtmlCanvasElement', 'Window']

‎README.md

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# Physicium
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A physic engine on the web build with wasm in rust.

‎index.html

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<html>
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<head>
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<meta content="text/html;charset=utf-8" http-equiv="Content-Type"/>
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</head>
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<body>
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<canvas id="canvas" height="800" width="800"></canvas>
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</body>
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</html>

‎index.js

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// For more comments about what's going on here, check out the `hello_world`
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// example.
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import('./pkg')
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.then(wasm => {
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const canvas = document.getElementById('canvas');
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const ctx = canvas.getContext('2d');
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let world = wasm.World.new();
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world.add_object(100., 20., 0., 0., 20., 40.);
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world.add_object(20., 40., 0., 0., 30., 40.);
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let view = wasm.WorldView.new(800, 800)
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function loop() {
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world.apply_physic(16);
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view.draw(world, ctx);
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requestAnimationFrame(loop);
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}
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loop();
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})
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.catch(console.error);

‎package-lock.json

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‎package.json

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{
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"scripts": {
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"build": "webpack",
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"serve": "webpack serve"
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},
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"devDependencies": {
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"@wasm-tool/wasm-pack-plugin": "1.5.0",
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"html-webpack-plugin": "^5.6.0",
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"webpack": "^5.93.0",
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"webpack-cli": "^5.1.4",
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"webpack-dev-server": "^5.0.4"
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}
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}

‎src/lib.rs

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use std::f64;
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use wasm_bindgen::prelude::*;
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use web_sys::CanvasRenderingContext2d;
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const STD_GRAVITY: f32 = 9.8;
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const STD_METER_SIZE: f32 = 50.0;
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#[derive(Clone)]
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pub struct Object {
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pos_x: f32,
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pos_y: f32,
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velocity_x: f32,
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velocity_y: f32,
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radius: f32,
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mass: f32,
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}
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#[wasm_bindgen]
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pub struct World {
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gravity_x: f32,
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gravity_y: f32,
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meter_size: f32,
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objects: Vec<Object>
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}
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#[wasm_bindgen]
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pub struct WorldView {
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canvas_width: u32,
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canvas_height: u32,
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center: (f32, f32),
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scale: f32
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}
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/// Public methods, exported to JavaScript.
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#[wasm_bindgen]
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impl World {
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pub fn new() -> World {
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World{
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gravity_x: 0.0,
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gravity_y: STD_GRAVITY,
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meter_size: STD_METER_SIZE,
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objects: Vec::new()
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}
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}
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pub fn set_gravity_x(&mut self, gravity: f32) {
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self.gravity_x = gravity;
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}
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pub fn set_gravity_y(&mut self, gravity: f32) {
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self.gravity_y = gravity;
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}
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pub fn set_meter_size(&mut self, size: f32) {
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self.meter_size = size;
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}
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pub fn add_object(
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&mut self, pos_x: f32, pos_y: f32,
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velocity_x: f32, velocity_y: f32,
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radius: f32, mass: f32
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) {
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self.objects.push(
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Object{pos_x, pos_y, velocity_x, velocity_y, radius, mass});
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}
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pub fn get_nb_object(&self) -> usize {
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self.objects.len()
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}
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pub fn apply_physic(&mut self, elapsed_time_ms: u32) {
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let elapsed_time: f32 = elapsed_time_ms as f32 / 1000.0;
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for obj in self.objects.iter_mut() {
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obj.velocity_x += self.gravity_x * elapsed_time * self.meter_size;
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obj.velocity_y += self.gravity_y * elapsed_time * self.meter_size;
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}
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for obj in self.objects.iter_mut() {
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obj.pos_x += obj.velocity_x * elapsed_time;
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obj.pos_y += obj.velocity_y * elapsed_time;
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}
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}
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}
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#[wasm_bindgen]
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impl WorldView {
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pub fn new(canvas_width: u32, canvas_height: u32) -> WorldView {
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WorldView{canvas_width, canvas_height, center:(0.0, 0.0), scale: 1.0 }
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}
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pub fn set_view_center(&mut self, canvas_width: u32, canvas_height: u32) {
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self.canvas_width = canvas_width;
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self.canvas_height = canvas_height;
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}
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pub fn set_scale(&mut self, scale: f32) {
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self.scale = scale;
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}
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pub fn draw(&self, world: &World, ctx: CanvasRenderingContext2d) {
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ctx.set_fill_style(&"white".into());
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ctx.fill_rect(0., 0., 800., 800.);
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ctx.set_fill_style(&"black".into());
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for obj in world.objects.iter() {
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ctx.begin_path();
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ctx.arc(
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(obj.pos_x - self.center.0) as f64,
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(obj.pos_y - self.center.1) as f64,
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obj.radius as f64,
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0.0,
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3.1415 * 2.0
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);
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// ctx.set_fill_style(&"rgb(0,0,0)".into());
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ctx.fill();
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ctx.close_path();
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}
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}
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}

‎webpack.config.js

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const path = require('path');
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const HtmlWebpackPlugin = require('html-webpack-plugin');
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const webpack = require('webpack');
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const WasmPackPlugin = require("@wasm-tool/wasm-pack-plugin");
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module.exports = {
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entry: './index.js',
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output: {
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path: path.resolve(__dirname, 'dist'),
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filename: 'index.js',
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},
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plugins: [
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new HtmlWebpackPlugin({
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template: 'index.html'
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}),
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new WasmPackPlugin({
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crateDirectory: path.resolve(__dirname, ".")
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}),
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],
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mode: 'development',
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experiments: {
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asyncWebAssembly: true
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}
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};

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