.circle-box {
text-align: center;
margin-top: 10vw;
}
.circle {
position: absolute;
left: 0;
right: 0;
margin: auto;
}
.draw_btn {
width: 35vw;
position: absolute;
top: 33vw;
right: 0;
left: 0;
margin: auto;
border: 1px #000 solid;
border-radius: 5vw;
}
var interval;
var varName;
var ctx = wx.createCanvasContext('canvasArcCir');
Page({
data: {
},drawCircle: function () {
clearInterval(varName);
function drawArc(s,e) {
ctx.setFillStyle('white');
ctx.clearRect(0,200,200);
ctx.draw();
var x = 100,y = 100,radius = 96;
ctx.setLineWidth(5);
ctx.setStrokeStyle('#d81e06');
ctx.setLineCap('round');
ctx.beginPath();
ctx.arc(x,y,radius,s,e,false);
ctx.stroke()
ctx.draw()
}
var step = 1,startAngle = 1.5 Math.PI,endAngle = 0;
var animation_interval = 1000,n = 60;
var animation = function () {
if (step <= n) {
endAngle = step 2 Math.PI / n + 1.5 Math.PI;
drawArc(startAngle,endAngle);
step++;
} else {
clearInterval(varName);
}
};
varName = setInterval(animation,animation_interval);
},onReady: function () {
//创建并返回绘图上下文context对象。
var cxt_arc = wx.createCanvasContext('canvasCircle');
cxt_arc.setLineWidth(6);
cxt_arc.setStrokeStyle('#eaeaea');
cxt_arc.setLineCap('round');
cxt_arc.beginPath();
cxt_arc.arc(100,100,96,2 * Math.PI,false);
cxt_arc.stroke();
cxt_arc.draw();
},onLoad: function (options) {
}
})
