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forked from SpaceActuary's block: Group Clustering
forked from proto1994's block: canvas force
Created
June 9, 2020 15:38
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canvas force
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| license: mit |
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| ID | Location | Group | Class | Type | |
|---|---|---|---|---|---|
| 1 | 1 | A | X | M | |
| 2 | 1 | A | Y | N | |
| 3 | 1 | A | Y | N | |
| 4 | 1 | B | Z | M | |
| 5 | 1 | B | Y | M | |
| 6 | 1 | B | X | N | |
| 7 | 1 | B | Z | N | |
| 8 | 2 | A | Z | M | |
| 9 | 2 | B | Z | M | |
| 10 | 2 | B | Y | N | |
| 11 | 2 | B | X | N | |
| 12 | 2 | B | X | M |
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| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <style> | |
| body{ | |
| padding:0; | |
| margin:0; | |
| overflow: hidden; | |
| } | |
| #cas{ | |
| display: block; | |
| background-color:rgba(0,0,0,0); | |
| margin:auto; | |
| border:1px solid; | |
| } | |
| </style> | |
| <title>缓存测试(有缓存)</title> | |
| </head> | |
| <body> | |
| <div > | |
| <canvas id='cas' width="800" height="600">浏览器不支持canvas</canvas> | |
| <div style="text-align:center">使用了缓存，1000个圈圈对象也不卡</div> | |
| </div> | |
| <script> | |
| var testBox = function(){ | |
| var canvas = document.getElementById("cas"), | |
| ctx = canvas.getContext('2d'), | |
| borderWidth = 2, | |
| Balls = []; | |
| var ball = function(x , y , vx , vy , useCache){ | |
| this.x = x; | |
| this.y = y; | |
| this.vx = vx; | |
| this.vy = vy; | |
| this.r = getZ(getRandom(20,40)); | |
| this.color = []; | |
| this.cacheCanvas = document.createElement("canvas"); | |
| this.cacheCtx = this.cacheCanvas.getContext("2d"); | |
| this.cacheCanvas.width = 2*this.r; | |
| this.cacheCanvas.height = 2*this.r; | |
| var num = getZ(this.r/borderWidth); | |
| for(var j=0;j<num;j++){ | |
| this.color.push("rgba("+getZ(getRandom(0,255))+","+getZ(getRandom(0,255))+","+getZ(getRandom(0,255))+",1)"); | |
| } | |
| this.useCache = useCache; | |
| if(useCache){ | |
| this.cache(); | |
| } | |
| } | |
| function getZ(num){ | |
| var rounded; | |
| rounded = (0.5 + num) | 0; | |
| // A double bitwise not. | |
| rounded = ~~ (0.5 + num); | |
| // Finally, a left bitwise shift. | |
| rounded = (0.5 + num) << 0; | |
| return rounded; | |
| } | |
| ball.prototype = { | |
| paint:function(ctx){ | |
| if(!this.useCache){ | |
| ctx.save(); | |
| var j=0; | |
| ctx.lineWidth = borderWidth; | |
| for(var i=1;i<this.r;i+=borderWidth){ | |
| ctx.beginPath(); | |
| ctx.strokeStyle = this.color[j]; | |
| ctx.arc(this.x , this.y , i , 0 , 2*Math.PI); | |
| ctx.stroke(); | |
| j++; | |
| } | |
| ctx.restore(); | |
| } else{ | |
| ctx.drawImage(this.cacheCanvas , this.x-this.r , this.y-this.r); | |
| } | |
| }, | |
| cache:function(){ | |
| this.cacheCtx.save(); | |
| var j=0; | |
| this.cacheCtx.lineWidth = borderWidth; | |
| for(var i=1;i<this.r;i+=borderWidth){ | |
| this.cacheCtx.beginPath(); | |
| this.cacheCtx.strokeStyle = this.color[j]; | |
| this.cacheCtx.arc(this.r , this.r , i , 0 , 2*Math.PI); | |
| this.cacheCtx.stroke(); | |
| j++; | |
| } | |
| this.cacheCtx.restore(); | |
| }, | |
| move:function(){ | |
| this.x += this.vx; | |
| this.y += this.vy; | |
| if(this.x>(canvas.width-this.r)||this.x<this.r){ | |
| this.x=this.x<this.r?this.r:(canvas.width-this.r); | |
| this.vx = -this.vx; | |
| } | |
| if(this.y>(canvas.height-this.r)||this.y<this.r){ | |
| this.y=this.y<this.r?this.r:(canvas.height-this.r); | |
| this.vy = -this.vy; | |
| } | |
| this.paint(ctx); | |
| } | |
| } | |
| var Game = { | |
| init:function(){ | |
| for(var i=0;i<1000;i++){ | |
| var b = new ball(getRandom(0,canvas.width) , getRandom(0,canvas.height) , getRandom(-10 , 10) , getRandom(-10 , 10) , true) | |
| Balls.push(b); | |
| } | |
| }, | |
| update:function(){ | |
| ctx.clearRect(0,0,canvas.width,canvas.height); | |
| for(var i=0;i<Balls.length;i++){ | |
| Balls[i].move(); | |
| } | |
| }, | |
| loop:function(){ | |
| var _this = this; | |
| this.update(); | |
| RAF(function(){ | |
| _this.loop(); | |
| }) | |
| }, | |
| start:function(){ | |
| this.init(); | |
| this.loop(); | |
| } | |
| }; | |
| window.RAF = (function(){ | |
| return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (callback) {window.setTimeout(callback, 1000 / 60); }; | |
| })(); | |
| return Game; | |
| }(); | |
| function getRandom(a , b){ | |
| return Math.random()*(b-a)+a; | |
| } | |
| window.onload = function(){ | |
| testBox.start(); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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