Home  >  Article  >  Web Front-end  >  JavaScript+canvas realizes the seven-color board effect example_javascript skills

JavaScript+canvas realizes the seven-color board effect example_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:15:011568browse

The example in this article describes how JavaScript+canvas achieves the seven-color board effect. Share it with everyone for your reference, the details are as follows:

The rendering is as follows:

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();
    }
}

Readers who are interested in more JavaScript-related content can check out the special topics on this site: "Summary of JavaScript animation special effects and techniques", "Summary of JavaScript expansion techniques", "Summary of JavaScript motion effects and techniques", "Summary of JavaScript mathematical operation usage" and "Javascript object-oriented introductory tutorial"

I hope this article will be helpful to everyone in JavaScript programming.

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn