115 lines
1.7 KiB
JavaScript
115 lines
1.7 KiB
JavaScript
(function(
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Engine,
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Vector
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){ 'use strict';
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Engine.Point = function(id, x, y, shapeSize){
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this.id = id;
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this.shapeSize = shapeSize;
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this.ref = new Vector(x, y);
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this.pos = new Vector(
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x * shapeSize.x,
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y * shapeSize.y
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);
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this.target = this.pos.clone();
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this.pos.x = shapeSize.x / 2;
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this.pos.y = shapeSize.y / 2;
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this.accel = Vector.coerce(this.accel);
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this.vel = Vector.coerce(this.vel);
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this.stiffness = Engine.getRandomFloat(3, 6);
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this.friction = Engine.getRandomFloat(0.15, 0.3);
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};
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Engine.Point.prototype = {
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radius: 1,
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stiffness : 0.5,
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// friction : 0.00001,
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friction : 0.01,
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threshold : 0.03,
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pos: {
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x: 0,
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y: 0
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},
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accel: {
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x: 0,
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y: 0
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},
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vel : {
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x: 0,
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y: 0
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},
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target: {
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x: 0,
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y: 0
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},
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updateBreathingPhysics: function(){
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this.stiffness = 0.1;
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this.friction = 0.05;
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},
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updateTarget: function(newSize){
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var diff;
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this.target.x = this.ref.x * newSize.x;
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this.target.y = this.ref.y * newSize.y;
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diff = Vector.sub(newSize, this.shapeSize).div(2);
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this.target.sub(diff);
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this.target.add({
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x: Engine.getRandomFloat(-8, 8),
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y: Engine.getRandomFloat(-8, 8)
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});
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},
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update: function(engine){
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var newAccel;
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newAccel = Vector.sub(this.target, this.pos)
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.mult(this.stiffness)
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.sub(Vector.mult(this.vel, this.friction));
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this.accel.set(newAccel);
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this.vel.add(this.accel);
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this.pos.add(
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Vector.mult(this.vel, engine.tick)
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);
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newAccel = null;
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return this;
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},
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draw: function(ctx, scale){
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ctx.beginPath();
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ctx.arc(
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this.pos.x * scale,
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this.pos.y * scale,
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this.radius * scale,
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0,
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Math.PI * 2,
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false
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);
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ctx.fillStyle = '#ffffff';
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ctx.fill();
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return this;
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}
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};
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})(window.Engine, window.Vector);
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