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2015-09-06.html
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2015-09-06.html
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<!doctype html>
<html>
<head>
<title>2015/09/06</title>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1">
<style>
html, body {
height: 100%;
padding: 0;
margin: 0;
font-family: "ff-tisa-web-pro-1","ff-tisa-web-pro-2","Lucida Grande","Hiragino Sans GB","Hiragino Sans GB W3";
}
#canvas {
display: block;
/*cursor: none;*/
height: 100%;
width: 100%;
}
.sign {
position: absolute;
bottom: 20px;
right: 20px;
font-size: 14px;
color: #666;
font-style: italic;
}
#doujia {
position: absolute;
top: 50%;
left: 50%;
font-size: 18px;
-webkit-transform: translate3d(-50%, -50%, 0);
transform: translate3d(-50%, -50%, 0);
color: royalblue;
z-index: -1;
}
.help {
position: absolute;
bottom: 20px;
left: 20px;
color: tomato;
font-size: 12px;
text-decoration: underline;
}
.description {
position: absolute;
bottom: 40px;
left: 20px;
color: #666;
font-size: 12px;
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<div class="sign">Beyond</div>
<div id="doujia">
You cannot see me, <br/>until you see the particles.
<br/>
<br/>
<!--I love you, Doujia!-->
</div>
<div class="help">
Use pc to see the effect~
</div>
<div id="position">
</div>
<script type="text/javascript" src="https://code.createjs.com/easeljs-0.8.1.min.js"></script>
<script>
+function() {
var stage = new createjs.Stage("canvas");
var width = document.body.clientWidth;
var height = document.body.clientHeight;
var count = 0;
var center = {};
var cur = {};
function Particle(radius, angle, velocity, color, x, y, reverse) {
this.x = x;
this.y = y;
this.angle = angle;
this.velocity = velocity;
this.counter = 0;
this.particle = new createjs.Shape();
this.particle.graphics.beginFill(color).drawCircle(0, 0, radius);
this.particle.x = x;
this.particle.y = y;
this.reverse = reverse || false;
stage.addChild(this.particle);
return this;
}
Particle.prototype.update = function() {
var disX = cur.x - this.x;
var disY = cur.y - this.y;
var dis = Math.sqrt(disX * disX + disY * disY);
if (dis) {
if (dis < 300) {
if (disX) {
this.angle = Math.atan(disY/disX);
if (this.reverse) {
if (disX >= 0) {
this.angle += Math.PI;
}
}
else {
if (disX < 0) {
this.angle += Math.PI;
}
}
}
else {
if (this.reverse) {
if (disY < 0) {
this.angle = Math.PI / 2;
}
else {
this.angle = 3 * Math.PI / 2;
}
}
else {
if (disY < 0) {
this.angle = 3 * Math.PI / 2;
}
else {
this.angle = Math.PI / 2;
}
}
}
}
}
this.x += Math.cos(this.angle) * this.velocity;
this.y += Math.sin(this.angle) * this.velocity;
this.particle.x = this.x;
this.particle.y = this.y;
this.counter++;
};
Particle.prototype.inBound = function() {
return (this.x >= 0 && this.x <= width && this.y >= 0 && this.y <= height);
};
Particle.prototype.onBound = function() {
var res;
if (this.x >= -5 && this.x <=5) {
res = 0;
}
else if (this.x >= (width - 5) && this.x <= (width + 5)) {
res = 2;
}
else {
res = 1;
}
res *= 3;
if (this.y >= -5 && this.y <=5) {
res += 0;
}
else if (this.y >= (height - 5) && this.y <= (height + 5)) {
res += 2;
}
else {
res += 1;
}
return res;
};
function Emitter(angle, color, reverse) {
this.radius = 150;
this.particles = {};
this.angle = angle;
this.color = color;
this.reverse = reverse;
var emitter = new createjs.Shape();
emitter.graphics.beginFill(color).drawCircle(0, 0, 5);
this.emitter = emitter;
this.emitter.x = center.x + this.radius * Math.cos(this.angle);
this.emitter.y = center.y + this.radius * Math.sin(this.angle);
stage.addChild(emitter);
}
Emitter.prototype.emit = function() {
var angle = parseInt(Math.random() * 360, 10) / 180 * Math.PI;
var velocity = parseInt(Math.random() * 3, 10) + 2;
this.particles[count++] = new Particle(2, angle, velocity, this.color, this.emitter.x, this.emitter.y,
this.reverse);
};
Emitter.prototype.update = function() {
this.emitter.x = center.x + this.radius * Math.cos(this.angle);
this.emitter.y = center.y + this.radius * Math.sin(this.angle);
this.angle += 0.1 / Math.PI;
for (var i in this.particles) {
if (!this.particles.hasOwnProperty(i)) {
continue;
}
if (this.particles[i].counter >= 500) {
stage.removeChild(this.particles[i].particle);
delete this.particles[i];
}
else {
var res = this.particles[i].onBound();
var bx = Math.floor(res / 3);
var by = res % 3;
if (bx != 1) {
this.particles[i].angle = Math.PI - this.particles[i].angle;
// console.log(bx)
}
if (by != 1) {
this.particles[i].angle *= -1;
}
this.particles[i].update();
}
// if (!this.particles[i].inBound() || this.particles[i].counter >= 500) {
// stage.removeChild(this.particles[i].particle);
// delete this.particles[i];
// }
// else {
// this.particles[i].update();
// }
}
stage.update();
};
function init() {
var canvas = document.getElementById('canvas');
var colors = ["#00BFFF", "#FF69B4", "#3CB371", "#FFD700", "#CD5C5C", "#FF4500"];
var emitters = [];
var counter = 0;
cur.x = center.x = width / 2;
cur.y = center.y = height / 2;
canvas.setAttribute('width', width);
canvas.setAttribute('height', height);
createjs.Ticker.setFPS(60);
for (var i = 0; i < colors.length; i++) {
emitters.push(new Emitter(Math.PI * 2 / colors.length * (i + 0.5), colors[i], i % 2));
}
createjs.Ticker.addEventListener("tick", function() {
// cur = {x: stage.mouseX, y: stage.mouseY};
counter++;
emitters.forEach(function(emitter) {
if (counter % 6 == 0) {
emitter.emit();
}
emitter.update();
})
});
canvas.addEventListener('touchmove', function(e){
cur.x = e.touches[0].clientX;
cur.y = e.touches[0].clientY;
});
canvas.addEventListener('mousemove', function(e){
cur.x = e.clientX;
cur.y = e.clientY;
})
}
window.onload = init;
}();
</script>
</body>
</html>