canvas制作饼图和环形图，使用Excanvas兼容IE67

excanvas 地址：http://excanvas.sourceforge.net/
<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8" />

<title>canvas</title>

<style>

</style>

<!--[if lte IE 9]>

<script src="../html5shiv.js"></script>

<script src="excanvas.js"></script>

<script src="../jquery-1.11.0.min.js"></script>

<!--[if gt IE 9]><!-->

<script src="../jquery-2.1.0.min.js"></script>

<![endif]-->

</head>

<body>

<canvas id="pie" width="100" height="100" data-ratio="0.65_0.15_0.20" ></canvas>

<canvas class="doughnut" width="100" height="100" data-ratio="0.66_0.34"></canvas>

<script>

(function($){

$.fn.extend({

    pieChart: function(o){

            this.each(function(m, n){

                var target = $(n),

                    ratio = target.data('ratio').split('_'),

                    colors = o.colors,

                    ctx = n.getContext('2d'),

                    center = Math.floor(target.height()/2),    //圆心

                    radius = center - (o.borderWidth || 0),                    //半径

                    startAngle = Math.PI * 1.5,                             //起始弧度

                    endAngle = Math.PI * 1.5;     //结束弧度

                ctx.fillStyle = o.borderCorlor || '#ffffff';

                ctx.arc(center, center, center, 0, Math.PI * 2, true);

                ctx.fill();

                $.each(ratio, function(i, v){

                    endAngle = endAngle - v * Math.PI * 2; //结束弧度

                    ctx.fillStyle = colors[i];

                    ctx.beginPath();

                    ctx.moveTo(center, center);                     //移动到到圆心

                    ctx.arc(center, center, radius, startAngle, endAngle, true);

                    ctx.closePath();

                    ctx.fill();

                    if(o.stroke){

                        ctx.strokeStyle = o.stroke.color || '#ffffff';

                        ctx.lineWidth =  o.stroke.width || 1;

                        ctx.stroke();

                    }

                    startAngle = endAngle;                     //设置起始弧度

                });

            });    

        },

        doughnutChart: function(o){

            this.each(function(m, n){

                var target = $(n),

                    ratio = target.data('ratio').split('_'),

                    colors = o.colors,

                    ctx = n.getContext('2d'),

                    center = Math.floor(target.height()/2),

                    radius = center,

                    startAngle = Math.PI * 1.5,

                    endAngle = Math.PI * 1.5;

                $.each(ratio, function(i, v){

                    //弧度 = 角度 * Math.PI / 180

                    //v*360*Math.PI/180 =  v * Math.PI * 2

                    endAngle = endAngle - v * Math.PI * 2;

                    ctx.fillStyle = colors[i];

                    ctx.beginPath();

                    ctx.moveTo(center, center);

                    ctx.arc(center, center, radius, startAngle, endAngle, true);

                    ctx.closePath();

                    ctx.fill();

                    startAngle = endAngle;

                });

                ctx.fillStyle = o.centerColor;

                ctx.beginPath();

                ctx.arc(center, center, radius-o.borderWidth, 0, Math.PI * 2, true);

                ctx.fill();

            });

        }

});

$(window).on('load', function(){

    $('#pie').pieChart({

        colors: ['#7cb228', '#abd667', '#ededed'],

        borderWidth: 2,

        borderCorlor: '#7cb228'

        // stroke: {

        //     color: '#ff0000',

        //     width: 2

        // }

    });

    $('.doughnut').doughnutChart({

        colors: ['#7cb228', '#ededed'],

        centerColor: '#ffffff',

        borderWidth: 10

    });

});

})(jQuery);

</script>

</body>

</html>
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canvas制作饼图和环形图，使用Excanvas兼容IE67

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