还没有表白成功么？程序员教你如何用150行代码汇聚粒子爱心来脱单

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?css代码：

<style>
body {
margin: 0;
padding: 0;
background: white;
}

#myCanvas {
display: block;
}
</style>

<canvas
width="400"
height="300"
id="myLove"></canvas>

?javascript代码：
<script>
window.requestAnimFrame = (function () {
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function (callback) {
window.setTimeout(callback, 1000 / 60);
};
})();

var FX = {
config : {
background : 'rgba(250,250,250,0.2)',
color : 'rgb(250,20,75)',
highlight : 'rgb(250,20,20)'
},
dots : []
};

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

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;
};

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 );
};

FX.setFullscreen = function() {
FX.width = FX.canvas.width = window.innerWidth;
FX.height = FX.canvas.height = window.innerHeight;
};

FX.handleMouseEvent = function(e, power) {

var radius = 75,
k = FX.dots.length,
i=0,
mx, my,
dist, degree,
d;

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;
}
}
};

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
}) );
}
};

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 );
};
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); } );
FX.setFullscreen();
FX.createHeart();
FX.loop();
</script>