Canvas-line.html 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>

<body>
    <canvas id="canvas" style="border: 1px #ddd solid;display: block;margin:0 auto"></canvas>

    <script>

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

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

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

                // one

                    // 直线状态设置
                    context.beginPath();

                        context.moveTo(100,100);  
                        context.lineTo(700,700);  
                        context.lineTo(100,700);  
                        context.lineTo(100,100);  

                    context.closePath();

                    context.lineWidth = 5;    

                    // 绘制线 stroke
                    context.strokeStyle="blue"; 
                    context.stroke();          

                    // 填充色 fill
                    context.fillStyle = "rgb(2,100,30)";  
                    context.fill();

            }else{
                alert('当前游览器不支持Canvas，请更换游览器后再试！');
            }
        }
        
/*总结

    1.canvas的三个方法 width 、height、context

        context的方法
            moveTo  画笔起始位置
            lineTo  经过点
            lineWidth  线宽

            strokeStyle 画笔色
            stroke   绘制

            fillStyle 填充色
            fill  填充

    2.绘制多个图形的时候要使用 
        context.beginPath
        context.closePath

*/
    </script>
</body>
</html>

 

posted @ 2015-11-19 17:25  Cynthia娆墨旧染  阅读(186)  评论(0)  编辑  收藏  举报