78 lines
1.8 KiB
JavaScript
78 lines
1.8 KiB
JavaScript
var canvas = document.getElementById( 'canvas' ),
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ctx = canvas.getContext( '2d' ),
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canvas2 = document.getElementById( 'canvas2' ),
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ctx2 = canvas2.getContext( '2d' ),
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// full screen dimensions
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cw = window.innerWidth,
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ch = window.innerHeight,
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charArr = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'],
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maxCharCount = 100,
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fallingCharArr = [],
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fontSize = 10,
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maxColums = cw/(fontSize);
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canvas.width = canvas2.width = cw;
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canvas.height = canvas2.height = ch;
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function randomInt( min, max ) {
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return Math.floor(Math.random() * ( max - min ) + min);
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}
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function randomFloat( min, max ) {
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return Math.random() * ( max - min ) + min;
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}
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function Point(x,y)
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{
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this.x = x;
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this.y = y;
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}
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Point.prototype.draw = function(ctx){
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this.value = charArr[randomInt(0,charArr.length-1)].toUpperCase();
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this.speed = randomFloat(1,5);
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ctx2.fillStyle = "rgba(255,255,255,0.8)";
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ctx2.font = fontSize+"px san-serif";
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ctx2.fillText(this.value,this.x,this.y);
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ctx.fillStyle = "#0F0";
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ctx.font = fontSize+"px san-serif";
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ctx.fillText(this.value,this.x,this.y);
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this.y += this.speed;
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if(this.y > ch)
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{
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this.y = randomFloat(-100,0);
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this.speed = randomFloat(2,5);
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}
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}
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for(var i = 0; i < maxColums ; i++) {
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fallingCharArr.push(new Point(i*fontSize,randomFloat(-500,0)));
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}
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var update = function()
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{
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ctx.fillStyle = "rgba(0,0,0,0.05)";
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ctx.fillRect(0,0,cw,ch);
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ctx2.clearRect(0,0,cw,ch);
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var i = fallingCharArr.length;
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while (i--) {
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fallingCharArr[i].draw(ctx);
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var v = fallingCharArr[i];
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}
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requestAnimationFrame(update);
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}
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update(); |