en/builder/src/zrender/graphic/shape/Ring.js

/**
 * 圆环
 * @module zrender/graphic/shape/Ring
 */
import Path from '../Path';
export default Path.extend({
  type: 'ring',
  shape: {
    cx: 0,
    cy: 0,
    r: 0,
    r0: 0
  },
  buildPath: function (ctx, shape) {
    var x = shape.cx;
    var y = shape.cy;
    var PI2 = Math.PI * 2;
    ctx.moveTo(x + shape.r, y);
    ctx.arc(x, y, shape.r, 0, PI2, false);
    ctx.moveTo(x + shape.r0, y);
    ctx.arc(x, y, shape.r0, 0, PI2, true);
  }
});