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import { Face, Spring, Cloth } from './cloth.js';
class Point {
constructor(x, y) {
this.x = x;
this.y = y;
}
add(that) {
return new Point(
this.x + that.x,
this.y + that.y
);
}
sub(that) {
return new Point(
this.x - that.x,
this.y - that.y
);
}
dist(that) {
let a = this.x - that.x;
let b = this.y - that.y;
return Math.sqrt(a * a + b * b)
}
}
/**
* setup THREE JS Scene, Camera and Renderer
*/
function setup_scene(canvasSpace) {
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / (window.innerHeight - canvasSpace), 0.1, 1000);
const renderer = new THREE.WebGLRenderer();
/** size canvas to leave some space for UI */
renderer.setSize(window.innerWidth, window.innerHeight - canvasSpace);
/** embed canvas in HTML */
document.getElementById("threejscontainer").appendChild(renderer.domElement);
/** add global light */
const directionalLight = new THREE.DirectionalLight(0xffffff, 1);
scene.add(directionalLight);
/** position camera */
camera.position.y = 5;
camera.position.z = 10;
return [scene, camera, renderer];
}
/** call "init" when document is fully loaded */
document.body.onload = init;
function init() {
let mousePos = new Point();
let previousClothSimulation;
/**
* Space left empty under canvas
* for UI elements
*/
const canvasSpace = 200;
/** Constant Frame Time */
const frameTime = 1000.0 / 60.0;
/** Setup scene */
let [scene, camera, renderer] = setup_scene(canvasSpace);
/** setup cloth and generate debug mesh */
let cloth = new Cloth();
cloth.createBasic(10, 10, 10, 10);
//cloth.createDebugMesh(scene);
const material = new THREE.MeshBasicMaterial({ color: 0x0000ff });
const mesh = new THREE.Mesh(cloth.geometry, material);
//const mesh = new THREE.WireframeGeometry(cloth.geometry);
//const line = new THREE.LineSegments(mesh);
//line.material.depthTest = false;
//line.material.opacity = 0.25;
//line.material.transparent = true;
scene.add(mesh);
/**
* function called every frame
* @param {number} dt - time passed since last frame
*/
function animate(dt) {
cloth.simulate(dt);
setTimeout(() => {
animate(frameTime);
}, frameTime);
renderer.render(scene, camera);
}
/** add callback for window resize */
let canvas = document.getElementsByTagName("canvas")[0];
let resize = function () {
let w = window.innerWidth;
let h = window.innerHeight - 200;
canvas.width = w;
canvas.height = h;
}
window.onresize = resize;
resize();
/**
* if canvas has been successfully initialized
* start rendering
*/
if (canvas.getContext) {
animate(performance.now());
}
/** add mouse move callback */
canvas.onmousemove = (evt) => {
mousePos.x = evt.clientX;
mousePos.y = evt.clientY;
};
}
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