67 lines
2.2 KiB
TypeScript
67 lines
2.2 KiB
TypeScript
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class Composite {
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private _constraints: Constraint[] = [];
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public friction = new Vector2(0.98, 1);
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public drawParticles: boolean = true;
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public drawConstraints: boolean = true;
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public particles: Particle[] = [];
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/**
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* 处理解决所有约束条件
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*/
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public solveConstraints(){
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for (let i = this._constraints.length - 1; i >= 0; i --){
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this._constraints[i].solve();
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}
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}
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public addParticle(particle: Particle){
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this.particles.push(particle);
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return particle;
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}
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public addConstraint<T extends Constraint>(constraint: T): T{
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this._constraints.push(constraint);
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constraint.composite = this;
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return constraint;
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}
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public removeConstraint(constraint: Constraint){
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this._constraints.remove(constraint);
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}
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public updateParticles(deltaTimeSquared: number, gravity: Vector2){
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for (let j = 0; j < this.particles.length; j ++){
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let p = this.particles[j];
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if (p.isPinned){
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p.position = p.pinnedPosition;
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continue;
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}
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p.applyForce(Vector2.multiply(new Vector2(p.mass, p.mass), gravity));
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let vel = Vector2.multiply(Vector2.subtract(p.position, p.lastPosition), this.friction);
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let nextPos = Vector2.add(Vector2.add(p.position, vel), Vector2.multiply(p.acceleration, new Vector2(0.5 * deltaTimeSquared, 0.5 * deltaTimeSquared)));
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p.lastPosition = p.position;
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p.position = nextPos;
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p.acceleration.x = p.acceleration.y = 0;
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}
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}
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public debugRender(graphics: egret.Graphics){
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if (this.drawConstraints){
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for (let i = 0; i < this._constraints.length; i ++){
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this._constraints[i].debugRender(graphics);
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}
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}
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if (this.drawParticles){
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for (let i = 0; i < this.particles.length; i ++){
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let size = this.particles[i].radius ? this.particles[i].radius : 4;
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graphics.lineStyle(4, DebugDefaults.verletParticle);
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graphics.drawRect(this.particles[i].position.x, this.particles[i].position.y, size, size);
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graphics.endFill();
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}
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}
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}
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}
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