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  • HTML5 Canvas 绘制新西兰国旗

    代码:

    <!DOCTYPE html>
    <html lang="utf-8">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <head>
         <title>新西兰国旗</title>
        </head>
    
         <body onload="draw()">
            <canvas id="myCanvus" width="480px" height="240px" style="border:1px dashed black;">
                出现文字表示你的浏览器不支持HTML5
            </canvas>
         </body>
    </html>
    <script type="text/javascript">
    <!--
        function draw(){
            var canvas=document.getElementById("myCanvus");
            var canvasWidth=240;
            var canvasHeight=120;
    
            var context=canvas.getContext("2d");
            
            context.fillStyle = "white";
            context.fillRect(0, 0, canvasWidth*2, canvasHeight*2);
            
            // 先画角上蓝色方块
            context.fillStyle = "blue";
            context.fillRect(0, 0, 100, 40);
            context.fillRect(140, 0, 100, 40);
            context.fillRect(0, 80, 100, 40);
            context.fillRect(140, 80, 100, 40);
    
            // 用旋转的白色长条去盖上蓝色方块,覆盖完出现八个三角块
            context.save();
            context.translate(120,60);
            context.rotate(getRad(26.56));
            context.fillStyle = "white";
            context.fillRect(-300, -12, 600, 24);
            context.restore();
    
            context.save();
            context.translate(120,60);
            context.rotate(getRad(-26.56));
            context.fillStyle = "white";
            context.fillRect(-300, -12, 600, 24);
            context.restore();
    
            // 四个红条
            context.save();
            context.translate(120,60);
            context.rotate(getRad(26.56));
            context.fillStyle = "red";
            context.fillRect(-300, 0, 300, 8);
            context.restore();
    
            context.save();
            context.translate(120,60);
            context.rotate(getRad(-26.56));
            context.fillStyle = "red";
            context.fillRect(-300, 0, 300, 8);
            context.restore();
    
            context.save();
            context.translate(120,60);
            context.rotate(getRad(-26.56));
            context.fillStyle = "red";
            context.fillRect(0, -8, 300, 8);
            context.restore();
    
            context.save();
            context.translate(120,60);
            context.rotate(getRad(26.56));
            context.fillStyle = "red";
            context.fillRect(0, -8, 300, 8);
            context.restore();
    
            // 用一个白条去把中间部分的多余红边去掉
            context.fillStyle = "white";
            context.fillRect(0, 40, 240, 40);
    
            // 画中间的红色十字
            context.fillStyle = "red";
            context.fillRect(0, 48, 240, 24);
            context.fillRect(108, 0, 24, 120);
    
            // 用蓝色方块覆盖掉多出来的部分
            context.fillStyle = "blue";
            context.fillRect(0, canvasHeight, canvasWidth*2, canvasHeight);
            context.fillRect(canvasWidth, 0, canvasWidth, canvasHeight);
    
            // 逐个画南十字星的四颗星
    
            // 第一颗星
            var x=360;
            var y=45;
            context.save();
            var r=14;
            context.translate(x-r,y-r);
            context.strokeStyle = "white";
            context.fillStyle = "white";
            context.beginPath();
            context.moveTo(r, 0);
            context.lineTo(r+Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r-Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r+Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r-Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r, 0);
            context.fill();
            context.stroke();
            context.closePath();
            context.restore();
    
            context.save();
            r=10;
            context.translate(x-r,y-r);
            context.strokeStyle = "red";
            context.fillStyle = "red";
            context.beginPath();
            context.moveTo(r, 0);
            context.lineTo(r+Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r-Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r+Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r-Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r, 0);
            context.fill();
            context.stroke();
            context.closePath();
            context.restore();
    
            // 第二颗星
            var x=360;
            var y=200;
            context.save();
            var r=14;
            context.translate(x-r,y-r);
            context.strokeStyle = "white";
            context.fillStyle = "white";
            context.beginPath();
            context.moveTo(r, 0);
            context.lineTo(r+Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r-Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r+Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r-Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r, 0);
            context.fill();
            context.stroke();
            context.closePath();
            context.restore();
    
            context.save();
            r=10;
            context.translate(x-r,y-r);
            context.strokeStyle = "red";
            context.fillStyle = "red";
            context.beginPath();
            context.moveTo(r, 0);
            context.lineTo(r+Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r-Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r+Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r-Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r, 0);
            context.fill();
            context.stroke();
            context.closePath();
            context.restore();
    
            // 第三颗星
            var x=300;
            var y=110;
            context.save();
            var r=14;
            context.translate(x-r,y-r);
            context.strokeStyle = "white";
            context.fillStyle = "white";
            context.beginPath();
            context.moveTo(r, 0);
            context.lineTo(r+Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r-Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r+Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r-Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r, 0);
            context.fill();
            context.stroke();
            context.closePath();
            context.restore();
    
            context.save();
            r=10;
            context.translate(x-r,y-r);
            context.strokeStyle = "red";
            context.fillStyle = "red";
            context.beginPath();
            context.moveTo(r, 0);
            context.lineTo(r+Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r-Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r+Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r-Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r, 0);
            context.fill();
            context.stroke();
            context.closePath();
            context.restore();
    
            // 第四颗星
            var x=420;
            var y=100;
            context.save();
            var r=14;
            context.translate(x-r,y-r);
            context.strokeStyle = "white";
            context.fillStyle = "white";
            context.beginPath();
            context.moveTo(r, 0);
            context.lineTo(r+Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r-Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r+Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r-Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r, 0);
            context.fill();
            context.stroke();
            context.closePath();
            context.restore();
    
            context.save();
            r=10;
            context.translate(x-r,y-r);
            context.strokeStyle = "red";
            context.fillStyle = "red";
            context.beginPath();
            context.moveTo(r, 0);
            context.lineTo(r+Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r-Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r+Math.cos(Math.PI*1/10)*r, r-Math.sin(Math.PI*1/10)*r);
            context.lineTo(r-Math.cos(Math.PI*3/10)*r, r+Math.sin(Math.PI*3/10)*r);
            context.lineTo(r, 0);
            context.fill();
            context.stroke();
            context.closePath();
            context.restore();
        }
    
        function getRad(degree){
            return degree/180*Math.PI;
        }
    //-->
    </script>
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  • 原文地址:https://www.cnblogs.com/heyang78/p/7472041.html
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