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JavaScript+canvas实现七色板效果实例

2019-11-20 10:34:20
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本文实例讲述了JavaScript+canvas实现七色板效果。分享给大家供大家参考,具体如下:

效果图如下:

html:

<canvas id="canvas" class="canvas" width="600" height="600"></canvas>

css:

html,body{margin: 0;padding: 0}.canvas{display: block; margin-left:auto;margin-right:auto;margin-top: 50px;}

javascript:

var disk = [    {      area:[{x:0,y:0},{x:600,y:0},{x:300,y:300}],      color:"#CBF263"    },    {      area:[{x:0,y:0},{x:0,y:600},{x:300,y:300}],      color:"#5CB6D0"    },    {      area:[{x:0,y:600},{x:300,y:600},{x:150,y:450}],      color:"#FE9CCD"    },    {      area:[{x:150,y:450},{x:300,y:300},{x:450,y:450},{x:300,y:600}],      color:"#A696C3"    },    {      area:[{x:300,y:600},{x:600,y:600},{x:600,y:300}],      color:"#FBC421"    },    {      area:[{x:600,y:300},{x:600,y:0},{x:450,y:150},{x:450,y:450}],      color:"#FF5061"    },    {      area:[{x:450,y:450},{x:450,y:150},{x:300,y:300}],      color:"#FDEA11"    }]window.onload = function(){    var canvasDom = document.getElementById("canvas");    var ctx = canvasDom.getContext("2d");    drawDisk(disk,ctx)}function drawDisk(disk,ctx){    for(var i = 0;i<disk.length;i++){      ctx.beginPath();      ctx.moveTo(disk[i].area[0].x,disk[i].area[0].y);      for(var j = 1;j<disk[i]["area"].length;j++){        ctx.lineTo(disk[i].area[j].x,disk[i].area[j].y);      }      ctx.closePath();      ctx.fillStyle = disk[i]["color"];      ctx.fill();    }}

更多关于JavaScript相关内容感兴趣的读者可查看本站专题:《JavaScript动画特效与技巧汇总》、《JavaScript扩展技巧总结》、《JavaScript运动效果与技巧汇总》、《JavaScript数学运算用法总结》及《javascript面向对象入门教程

希望本文所述对大家JavaScript程序设计有所帮助。

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