canvas 怎么设置图片为圆形

1 回复

szeng1 楼4 年前

wx.createSelectorQuery().selectAll(".taste-canvas").boundingClientRect(function (rects) {

rects.forEach(function (rect) {

var ctx = wx.createCanvasContext(rect.dataset.id)

var num = rect.dataset.num

var color = rect.dataset.color

var wd = rect.width / 2.6

var po = rect.width / 2

console.info(rect.width / 2)

ctx.beginPath()

ctx.setLineCap("round")

ctx.setLineWidth(1)

ctx.arc(po, po, wd, 0, 2 * Math.PI);

ctx.setStrokeStyle("#f2f2f2");

ctx.stroke();

ctx.closePath();

ctx.beginPath()

ctx.arc(po, po, wd, 0, num * Math.PI);

ctx.setStrokeStyle(color)

ctx.setLineWidth(1)

ctx.setGlobalAlpha(0.9)

ctx.stroke()

ctx.closePath();

ctx.draw()

})

}).exec()