en/builder/src/echarts3/chart/chord/Ribbon.js

import * as graphic from '../../util/graphic';
var sin = Math.sin;
var cos = Math.cos;
export default graphic.extendShape({
  type: 'ec-ribbon',
  shape: {
    cx: 0,
    cy: 0,
    r: 0,
    s0: 0,
    s1: 0,
    t0: 0,
    t1: 0
  },
  style: {
    fill: '#000'
  },
  buildPath: function (ctx, shape) {
    var clockwise = shape.clockwise || false;
    var cx = shape.cx;
    var cy = shape.cy;
    var r = shape.r;
    var s0 = shape.s0;
    var s1 = shape.s1;
    var t0 = shape.t0;
    var t1 = shape.t1;
    var sx0 = cx + cos(s0) * r;
    var sy0 = cy + sin(s0) * r;
    var sx1 = cx + cos(s1) * r;
    var sy1 = cy + sin(s1) * r;
    var tx0 = cx + cos(t0) * r;
    var ty0 = cy + sin(t0) * r;
    var tx1 = cx + cos(t1) * r;
    var ty1 = cy + sin(t1) * r;
    ctx.moveTo(sx0, sy0);
    ctx.arc(cx, cy, shape.r, s0, s1, !clockwise);
    ctx.bezierCurveTo((cx - sx1) * 0.70 + sx1, (cy - sy1) * 0.70 + sy1, (cx - tx0) * 0.70 + tx0, (cy - ty0) * 0.70 + ty0, tx0, ty0); // Chord to self

    if (shape.s0 === shape.t0 && shape.s1 === shape.t1) {
      return;
    }

    ctx.arc(cx, cy, shape.r, t0, t1, !clockwise);
    ctx.bezierCurveTo((cx - tx1) * 0.70 + tx1, (cy - ty1) * 0.70 + ty1, (cx - sx0) * 0.70 + sx0, (cy - sy0) * 0.70 + sy0, sx0, sy0);
  }
});