canvas-2rect.html 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <canvas id="canvas" style="margin:0 auto;">
        The current browser does not support Canvas, can replace the browser a try!
    </canvas>

    <script>

        // 绘制矩形
        function drawRect(ctx,x,y,width,height,borderWidth,borderColor,fillColor){
            
            ctx.beginPath();
            ctx.rect(x,y,width,height)  //直接绘制矩形
            ctx.closePath();

            ctx.lineWidth = borderWidth;
            ctx.strokeStyle = borderColor;
            ctx.fillStyle = fillColor;

            ctx.fill();
            ctx.stroke();

        }

        function drawRect2(ctx,x,y,width,height,borderWidth,borderColor,fillColor){

            ctx.lineWidth = borderWidth;
            ctx.strokeStyle = borderColor;
            ctx.fillStyle = fillColor;

            ctx.fillRect(x,y,width,height);
            ctx.strokeRect(x,y,width,height);

        }

        window.onload = function(){
            var canvas = document.getElementById('canvas');

            canvas.width = 1024;
            canvas.height = 768;

            if(canvas.getContext('2d')){
                var context = canvas.getContext('2d');

                drawRect(context,100,100,400,400,10,"blue","yellow")
                drawRect2(context,300,300,400,400,10,"red","rgba(0,255,0,0.8)") //后绘制的填充色图形会对前面的图形进行遮挡

            }else{
                alert('当前游览器不支持Canvas，请更换游览器后再试！');
            }
        }
    </script>
</body>
</html>

 

posted @ 2015-11-19 17:29  Cynthia娆墨旧染  阅读(456)  评论(0)    收藏  举报