canvas一周一练 -- canvas绘制中国银行标志（4）

运行效果：
<!DOCTYPE html>

<html>

<head>

</head>

<body>

    <canvas id="drawing" width="" height="">A drawing of someing!</canvas>

    <script type="text/javascript">

        //绘制中国银行标志

        var drawBoc = function(){

            var drawing = document.getElementById('drawing');

            if(drawing.getContext) {

                var context = drawing.getContext('2d');

                //画外环

                context.fillStyle = '#f00';

                context.strokeStyle = '#f00';

                context.beginPath();

                context.arc(, , , , *Math.PI, false);

                context.closePath();

                context.stroke();

                context.fill();

                context.save();

                context.fillStyle = '#fff';

                context.beginPath();

                context.arc(, , , , *Math.PI, false);

                context.closePath();

                context.stroke();

                context.fill();

                //画外面的口（圆角矩形）

                context.restore();

                roundRec(context, , , , , , true, false);

                //画里面的口

                context.fillStyle = '#fff';

                context.fillRect(, , , );

                //画上下两竖

                context.fillStyle = '#f00';

                context.fillRect(, , , );

                context.fillRect(, , , );

            }

        };

        //画圆角矩形

        var roundRec = function(context, x, y, width, height, radius, fill, stroke){

            if(typeof stroke == 'undefined') {

                stroke = true;

            }

            if(typeof radius == 'undefined') {

                radius = ;

            }

            context.beginPath();

            context.moveTo(x+radius, y);

            context.lineTo(x+width-radius, y);

            context.quadraticCurveTo(x+width, y, x+width, y+radius);

            context.lineTo(x+width, y+height-radius);

            context.quadraticCurveTo(x+width, y+height, x+width-radius, y+height);

            context.lineTo(x+radius, y+height);

            context.quadraticCurveTo(x, y+height, x, y+height-radius);

            context.lineTo(x, y+radius);

            context.quadraticCurveTo(x, y, x+radius, y);

            context.closePath();

            if(stroke) {

                context.stroke();

            }

            if(fill) {

                context.fill();

            }

        };

        drawBoc();

    </script>

</body>

</html>
巴特西

canvas一周一练 -- canvas绘制中国银行标志（4）

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