情人节的表白神器:H5 canvas ❤动画面

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<!DOCTYPE html>

<head>

body {

margin: 0;

padding: 0;

background: white;

}

#myCanvas {

display: block;

}

</style>

</head>

<body>

</body>

<scripttype="text/javascript">

window.requestAnimFrame = (function () {

return window.requestAnimationFrame ||

window.webkitRequestAnimationFrame ||

window.mozRequestAnimationFrame ||

window.oRequestAnimationFrame ||

window.msRequestAnimationFrame ||

function (callback) {

window.setTimeout(callback, 1000 / 60);

};

})();

*basic stuff

var FX = {

config: {

background :'rgba(250,250,250,0.2)',

color : 'rgb(0,0,0)',//初始的颜色

highlight : 'rgb(0,0,0)'//鼠标经过de鼠标经过的yanse

dots : []

};

FX.canvas =document.getElementById('myLove');

FX.ctx = FX.canvas.getContext('2d');

*Extend Math Object

Math.TO_RAD = Math.PI/180;

Math.getDistance = function( x1, y1, x2, y2) {

var xs = 0,

ys = 0;

xs = x1 - x2;

ys = y1 - y2;

xs = xs * xs;

ys = ys * ys;

return Math.sqrt( xs + ys );

};

Math.getDegree = function( x1, y1, x2, y2 ){

var dx = x2 - x1,

dy = y2 - y1;

return Math.atan2(dy,dx) / Math.TO_RAD;

};

*Dot Object

var Dot = function( opts ) {

this.color = opts.color;

this.x = 0;

this.y = 0;

this.dest_x = (opts.dest_x - 75);

this.dest_y = (opts.dest_y - 75);

};

Dot.prototype.update = function() {

var d = this,

dist_x = d.dest_x - d.x,

dist_y = d.dest_y - d.y;

d.x += dist_x * 0.05;

d.y += dist_y * 0.05;

FX.ctx.fillStyle = d.color;

FX.ctx.fillRect( d.x-2, d.y-2, 4, 4 );

};

*full screen canvas

FX.setFullscreen = function() {

FX.width = FX.canvas.width = window.innerWidth;

FX.height = FX.canvas.height = window.innerHeight;

};

*Mouse

FX.handleMouseEvent = function(e, power) {

var radius = 75,

k = FX.dots.length,

i=0,

mx, my,

dist, degree,

if(e.offsetX) {

mx = e.offsetX;

my = e.offsetY;

}else if(e.layerX) {

mx = e.layerX;

my = e.layerY;

}

mx -= FX.width/2;

my -= FX.height/2;

for( ;i<k;i=i+1 ) {

d = FX.dots[i];

dist = Math.getDistance( mx, my, d.x, d.y);

if( dist < radius ) {

degree = Math.getDegree( d.x, d.y, mx, my );

d.x += (Math.cos( degree * Math.TO_RAD ) * ((radius-dist) * power));

d.y += (Math.sin( degree * Math.TO_RAD ) * ((radius-dist) * power));

d.color = FX.config.highlight;

} else {

d.color = FX.config.color;

}

};

*create the heart

FX.createHeart = function() {

var coords =[[1,4],[1,5],[1,6],[1,7],[1,8],[2,3],[2,4],[2,5],[2,6],[2,7],[2,8],[2,9],[3,2],[3,3],[3,4],[3,5],[3,6],[3,7],[3,8],[3,9],[3,10],[4,2],[4,3],[4,4],[4,5],[4,6],[4,7],[4,8],[4,9],[4,10],[4,11],[5,2],[5,3],[5,4],[5,5],[5,6],[5,7],[5,8],[5,9],[5,10],[5,11],[6,2],[6,3],[6,4],[6,5],[6,6],[6,7],[6,8],[6,9],[6,10],[6,11],[6,12],[7,3],[7,4],[7,5],[7,6],[7,7],[7,8],[7,9],[7,10],[7,11],[7,12],[8,3],[8,4],[8,5],[8,6],[8,7],[8,8],[8,9],[8,10],[8,11],[8,12],[8,13],[9,2],[9,3],[9,4],[9,5],[9,6],[9,7],[9,8],[9,9],[9,10],[9,11],[9,12],[10,2],[10,3],[10,4],[10,5],[10,6],[10,7],[10,8],[10,9],[10,10],[10,11],[11,2],[11,3],[11,4],[11,5],[11,6],[11,7],[11,8],[11,9],[11,10],[11,11],[12,2],[12,3],[12,4],[12,5],[12,6],[12,7],[12,8],[12,9],[12,10],[13,3],[13,4],[13,5],[13,6],[13,7],[13,8],[13,9],[14,4],[14,5],[14,6],[14,7],[14,8]],

k = coords.length,

raster = 10,

i = 0;

for( ;i<k;i=i+1 ) {

FX.dots.push( new Dot({

dest_x : coords[i][0] * raster,

dest_y : coords[i][1] * raster,

color: FX.config.color

}) );

}

};

*main loop

FX.loop = function() {

var ctx = FX.ctx,

k = FX.dots.length,

i = 0;

ctx.fillStyle = FX.config.background;

ctx.fillRect(0,0, FX.width, FX.height );

ctx.save();

ctx.translate( FX.width/2, FX.height/2 );

for( ;i<k;i=i+1 ) {

FX.dots[i].update();

}

ctx.restore();

requestAnimFrame( FX.loop );

};

*Event bindings

window.addEventListener('resize',FX.setFullscreen );

FX.canvas.addEventListener('mousemove',function(e) { FX.handleMouseEvent(e, -0.1); } );

FX.canvas.addEventListener('mousedown',function(e) { FX.handleMouseEvent(e, 1); } );

*Init

FX.setFullscreen();

FX.createHeart();

FX.loop();

</script>

</html>

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