JavaScript canvas实现围绕旋转动画

 function Circle(obj) { this._init(obj); } Circle.prototype = { _init: function (obj) { this.x = obj.x, //圆心x轴的坐标 this.y = obj.y, //圆心y轴的坐标 this.outR = obj.outR, //外圆的半径 this.inR = obj.inR, //内圆的半径 this.color = obj.fill, //填充颜色 this.text = obj.text, //内圆的文字 this.outOpacity = obj.outOpacity, //外圆的透明度 this.inOpacity = obj.inOpacity  //内圆的透明度 }, drawCircle: function (group) { //创建一个组 var groupCir = new Konva.Group({ x: this.x, y: this.y }); //外圆 var outCir = new Konva.Circle({ x: 0, y: 0, radius: this.outR, fill: this.color, opacity: this.outOpacity }); groupCir.add(outCir); //内圆 var inCir = new Konva.Circle({ x: 0, y: 0, radius: this.inR, fill: this.color, opacity: this.inOpacity }); groupCir.add(inCir); //添加文字 var text = new Konva.Text({ x: -this.inR, y: -10, text: this.text, fill: "white", fontSize: 20, width: 2 * this.inR, align: "center" }); groupCir.add(text); group.add(groupCir); } }