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锁定老帖子 主题：Canvas模拟小时候一种很炫的绘图玩具
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发表时间：2012-12-05
小时候的这个玩具是这样的：一块大齿轮圈圈，齿轮在圈内，还有其他几块小的齿轮圈圈，齿轮在圈外，小齿轮内还有很多小孔，把小齿轮放在大齿轮圈内，将铅笔插入小齿轮圈的小孔上，然后滑动铅笔，就能画出各式各样的弧线形状。 但忘记了这个玩具叫什么，有谁知道的，望告知。
演示地址：http://www.cssass.com/blog/index.php/2012/1335.html
<!doctype html>
<html>
<head>
<meta charset='UTF-8' />
<title>圈圈图</title>
<style>
*{padding:0;margin:0;}
body{background:#999}
#operationBar{position: fixed;bottom:0;width:100%;text-align:center;}
</style>
</head>
<body>
<div id="operationBar">
<label><input class="opt" id="showCricle" type="checkbox" />圈</label>
<label><input class="opt" id="showLine" type="checkbox" checked/>线</label>
<label><input class="opt" id="showPoint" type="checkbox" />点</label>
<label><input class="opt" id="showColor" type="checkbox" checked />颜色</label>
<label><input class="opt" id="isRefresh" type="checkbox" />刷新</label>
<label>大圈半径:<input class="opt" id="bigRadius" type="text" value="133" /></label>
<label>小圈半径:<input class="opt" id="smallRadius" type="text" value="140" /></label>
<label>线长:<input class="opt" id="lineLength" type="text" value="123" /></label>
<label><input id="runBtn" type="button" value="新建"/></label>
</div>
</body>
<script>
function $id(o){
return document.getElementById(o);
}
function extendCopy(p, c) {
var c = c || {};
for (var i in p) {
c[i] = p[i];
}
c.uber = p;
return c;
}
function Toy(options){
this.setOptions(options);
this.createPad();
this.draw(true);
}
Toy.prototype = {
setOptions: function(options) {
this.options = {
R: 133, //大圈半径
r: 140, //小圈半径
l: 123, //线长
showPoint: false, //显示小点
showCricle: false, //显示小圈
showLine: true, //显示线条
isRefresh: false, //每次清屏
showColor : false, //颜色变化
count : 1500 //绘制次数
};
extendCopy(options || {}, this.options);
//实际占用区域半径的计算
var delta = 0;
if(this.options.R > this.options.r){
delta = (this.options.r > this.options.l) ? 0 : this.options.l - this.options.r;
this.radius = this.options.R + delta;
}else{
delta = (this.options.r > this.options.l) ? this.options.r - this.options.R : this.options.l - this.options.R;
this.radius = this.options.r + delta;
}
this.radius += 10;
this.color = {
r : 0,
g : 0,
b : 255,
a : 0.5
};
this.colorValue = "rgba("+this.color.r+","+this.color.g+","+this.color.b+","+this.color.a+")";
this.angle = 0;
this.timePlay = null;
},
changeColor : function(){
this.color.r += 10;
if(this.color.r > 255){
this.color.r = 0;
this.color.g += 10;
}
if(this.color.g > 255){
this.color.r = 0;
this.color.g = 0;
this.color.b += 10;
}
if(this.color.b > 255){
this.color.r = 0;
this.color.g = 0;
this.color.b = 0;
}
this.colorValue = "rgba("+this.color.r+","+this.color.g+","+this.color.b+","+this.color.a+")";
},
createPad : function(isReset){
if(!isReset){
this.pad = document.createElement("canvas");
document.body.appendChild(this.pad);
}
this.pad.width = this.radius * 2;
this.pad.height = this.radius * 2;
this.ctx = this.pad.getContext('2d');
this.ctx.lineJoin = 'round';
this.ctx.lineCap = 'round';
this.ctx.lineWidth=.5;
this.ctx.strokeStyle = this.colorValue;
this.ctx.fillStyle = this.colorValue;
},
draw : function(isFirst){
this.ctx.save();
if(this.options.showColor){
this.changeColor();
this.ctx.strokeStyle = this.colorValue;
this.ctx.fillStyle = this.colorValue;
}
//大圆
this.ctx.translate(this.radius, this.radius);
if(isFirst){
this.ctx.beginPath();
this.ctx.arc(0,0,this.options.R,0,Math.PI*2,true);
this.ctx.closePath();
this.ctx.stroke();
}
//小圆
this.ctx.rotate(-this.angle);
this.ctx.translate(this.options.R-this.options.r,0);
if(this.options.showCricle || isFirst){
this.ctx.beginPath();
this.ctx.arc(0,0,this.options.r,0,Math.PI*2,true);
this.ctx.closePath();
this.ctx.stroke();
}
//线
this.ctx.rotate(this.angle * this.options.R/this.options.r);
if(this.options.showLine || isFirst){
this.ctx.beginPath();
this.ctx.moveTo(0,0);
this.ctx.lineTo(this.options.l,0);
this.ctx.stroke();
}
//小点
if(this.options.showPoint || isFirst){
this.ctx.translate(this.options.l,0);
this.ctx.beginPath();
this.ctx.arc(0,0,1,0,Math.PI*2,true);
this.ctx.fill();
}
this.ctx.restore();
this.angle += 0.2;
return this;
},
move : function(){
var that = this,
count = 0,
_s = function(){
that.clear(count == 0).draw();
count ++;
that.timePlay = setTimeout(_s,50);
if(that.options.count < count) {
clearTimeout(that.timePlay)
};
}
_s();
return this;
},
stop : function(){
clearTimeout(this.timePlay);
return this;
},
clear : function(isInit){
if(this.options.isRefresh || isInit){
this.ctx.clearRect(0,0,this.radius * 2,this.radius * 2);
}
return this;
},
reset : function(options){
this.setOptions(options);
this.createPad(true);
this.draw(true);
return this;
}
}
function getOpt(){
return {
R : $id("bigRadius").value - 0 || 133,
r : $id("smallRadius").value - 0 || 140,
l : $id("lineLength").value - 0 || 123,
showPoint: $id("showPoint").checked,
showCricle: $id("showCricle").checked,
showLine: $id("showLine").checked,
isRefresh: $id("isRefresh").checked,
showColor : $id("showColor").checked
}
}
$id("runBtn").onclick = function(){
new Toy(getOpt()).move();
}
var opt = getOpt();
var temp1 = new Toy(opt),
temp2 = new Toy(opt).move();
var inputs = document.getElementsByClassName("opt");
for (var i = inputs.length - 1; i >= 0; i--) {
inputs[i].onchange = function(){
temp1.reset(getOpt());
}
};
</script>
</html>
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发表时间：2012-12-05
最后修改：2012-12-05
附图
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发表时间：2012-12-05
这个数学上叫摆线
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发表时间：2012-12-17
这玩具名字叫 繁花规
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发表时间：2012-12-20
刚开始接触html5，感谢楼主分享源码，先顶贴，再细读
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发表时间：2012-12-28
嗯，繁花规
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