zh/builder/src/echarts3/chart/gauge/PointerPath.js

import Path from 'zrender/src/graphic/Path';
export default Path.extend({
  type: 'echartsGaugePointer',
  shape: {
    angle: 0,
    width: 10,
    r: 10,
    x: 0,
    y: 0
  },
  buildPath: function (ctx, shape) {
    var mathCos = Math.cos;
    var mathSin = Math.sin;
    var r = shape.r;
    var width = shape.width;
    var angle = shape.angle;
    var x = shape.x - mathCos(angle) * width * (width >= r / 3 ? 1 : 2);
    var y = shape.y - mathSin(angle) * width * (width >= r / 3 ? 1 : 2);
    angle = shape.angle - Math.PI / 2;
    ctx.moveTo(x, y);
    ctx.lineTo(shape.x + mathCos(angle) * width, shape.y + mathSin(angle) * width);
    ctx.lineTo(shape.x + mathCos(shape.angle) * r, shape.y + mathSin(shape.angle) * r);
    ctx.lineTo(shape.x - mathCos(angle) * width, shape.y - mathSin(angle) * width);
    ctx.lineTo(x, y);
    return;
  }
});