微信小程序 使用canvas画饼图
<canvas canvas-id="Canvas" style="width:100%;height:360px;"></canvas>
Javascript文件
Page({
data: {
},
onLoad: function () {
var context = wx.createCanvasContext('Canvas');
var array = [20, 50, 60];
var colors = ["#228B22", "#008B8B","#ADFF2F"];
var total = 0;
for (var val = 0; val < array.length; val++) {
total += array[val];
}
var point = { x: 160, y: 120 };
var radius = 100;
for (var i = 0; i < array.length; i++) {
context.beginPath();
var start = 0;
if (i > 0) {
for (var j = 0; j < i; j++) {
start += array[j] / total * 2 * Math.PI;
}
}
context.arc(point.x, point.y, radius, start, start+array[i] / total * 2 * Math.PI, false);
context.setLineWidth(2)
context.lineTo(point.x, point.y);
context.setStrokeStyle('#F5F5F5');
context.setFillStyle(colors[i]);
context.fill();
context.closePath();
context.stroke();
}
context.draw();
}
})
效果图