mirror of
https://github.com/photonstorm/phaser
synced 2024-12-23 11:33:28 +00:00
74 lines
2 KiB
TypeScript
74 lines
2 KiB
TypeScript
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/// <reference path="../Game.ts" />
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/// <reference path="Particle.ts" />
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/// <reference path="../geom/Vector2.ts" />
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/**
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* Phaser - AngleConstraint
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*
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* constrains 3 particles to an angle
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*/
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module Phaser.Verlet {
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export class AngleConstraint {
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/**
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* Creates a new AngleConstraint object.
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* @class AngleConstraint
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* @constructor
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* @param {Number} x The x coordinate of vector2
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* @param {Number} y The y coordinate of vector2
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* @return {AngleConstraint} This object
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**/
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constructor(a: Phaser.Verlet.Particle, b: Phaser.Verlet.Particle, c: Phaser.Verlet.Particle, stiffness: number) {
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this.a = a;
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this.b = b;
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this.c = c;
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this.angle = this.b.pos.angle2(this.a.pos, this.c.pos);
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this.stiffness = stiffness;
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}
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public a: Phaser.Verlet.Particle;
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public b: Phaser.Verlet.Particle;
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public c: Phaser.Verlet.Particle;
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public angle: number;
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public stiffness: number;
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public relax(stepCoef: number) {
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var angle = this.b.pos.angle2(this.a.pos, this.c.pos);
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var diff = angle - this.angle;
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if (diff <= -Math.PI)
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diff += 2 * Math.PI;
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else if (diff >= Math.PI)
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diff -= 2 * Math.PI;
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diff *= stepCoef * this.stiffness;
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this.a.pos = this.a.pos.rotate(this.b.pos, diff);
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this.c.pos = this.c.pos.rotate(this.b.pos, -diff);
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this.b.pos = this.b.pos.rotate(this.a.pos, diff);
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this.b.pos = this.b.pos.rotate(this.c.pos, -diff);
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}
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public render(ctx) {
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ctx.beginPath();
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ctx.moveTo(this.a.pos.x, this.a.pos.y);
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ctx.lineTo(this.b.pos.x, this.b.pos.y);
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ctx.lineTo(this.c.pos.x, this.c.pos.y);
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var tmp = ctx.lineWidth;
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ctx.lineWidth = 5;
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ctx.strokeStyle = "rgba(255,255,0,0.2)";
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ctx.stroke();
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ctx.lineWidth = tmp;
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}
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}
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}
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