github.com/atsaki/terraform@v0.4.3-0.20150919165407-25bba5967654/website/source/assets/javascripts/app/Engine.Particle.Fixed.js (about)

     1  (function(
     2  	Particle,
     3  	Engine,
     4  	Vector
     5  ){
     6  
     7  Particle.Fixed = function(width, height){
     8  	var targetX, targetY;
     9  
    10  	this.radius = Engine.getRandomFloat(0.1, 1);
    11  	// this.fillA = 'rgba(136,67,237,' + Engine.getRandomFloat(0.4, 0.5) + ')';
    12  	// this.fillB = 'rgba(136,67,237,' + Engine.getRandomFloat(0.51, 0.6) + ')';
    13  	this.fillA = '#3a1066';
    14  	this.fillB = '#561799';
    15  	this.frameMax = Engine.getRandomInt(4, 10);
    16  
    17  	this.max = {
    18  		x: width  + this.maxRadius,
    19  		y: height + this.maxRadius
    20  	};
    21  
    22  	this.min = {
    23  		x: 0 - this.maxRadius,
    24  		y: 0 - this.maxRadius
    25  	};
    26  
    27  	targetX = Engine.getRandomInt(0 + this.radius, width  + this.radius);
    28  	targetY = Engine.getRandomInt(0 + this.radius, height + this.radius);
    29  
    30  	this.pos = new Vector(targetX, targetY);
    31  };
    32  
    33  Engine.Particle.Fixed.prototype = {
    34  
    35  	radius: 1,
    36  
    37  	pos: {
    38  		x: 0,
    39  		y: 0
    40  	},
    41  
    42  	frame: 0,
    43  	showA: false,
    44  
    45  	update: function(engine){
    46  		this.frame++;
    47  		if (this.frame > this.frameMax) {
    48  			this.frame = 0;
    49  			this.showA = !this.showA;
    50  		}
    51  		return this;
    52  	},
    53  
    54  	draw: function(ctx, scale){
    55  		// Draw a circle - far less performant
    56  		ctx.beginPath();
    57  		ctx.arc(
    58  			this.pos.x * scale >> 0,
    59  			this.pos.y * scale >> 0,
    60  			this.radius * scale,
    61  			0,
    62  			Math.PI * 2,
    63  			false
    64  		);
    65  		if (this.showA) {
    66  			ctx.fillStyle = this.fillA;
    67  		} else {
    68  			ctx.fillStyle = this.fillB;
    69  		}
    70  		ctx.fill();
    71  
    72  		return this;
    73  	}
    74  
    75  };
    76  
    77  })(window.Engine.Particle, window.Engine, window.Vector);