javascript - 带箭头的 highcharts 单线

Question

我想要一个图表，其中有一个单线箭头，如下所示:

<-------X------------>
1    2    3    4    5

或者像这样(其中/假设是一个箭头:)):

           \/
 -------------------------
 | 1 | 2 | 3 | 4 | 5 |
 -------------------------

我尝试对此进行了一些尝试，但没有任何结果，而且我找不到任何好的例子。有什么好的 Highcharts 吗？

http://jsfiddle.net/o6cxfn5s/

Answer 1

请参阅此现场演示:http://jsfiddle.net/kkulig/u3qj6u74/

它包含负责绘制图形的包装核心函数:

  (function(H) {
    H.wrap(H.Series.prototype, 'drawGraph', function(proceed) {
      // Now apply the original function with the original arguments, 
      // which are sliced off this function's arguments
      proceed.apply(this, Array.prototype.slice.call(arguments, 1));

      var arrowLength = 15,
        arrowWidth = 9,
        series = this,
        lastPoint = series.points[series.points.length - 1],
        nextLastPoint = series.points[series.points.length - 2],
        path = [];


      var angle = Math.atan((lastPoint.plotX - nextLastPoint.plotX) / (lastPoint.plotY - nextLastPoint.plotY));

      if (angle < 0) angle = Math.PI + angle;

      path.push('M', lastPoint.plotX, lastPoint.plotY);

      if (lastPoint.plotX > nextLastPoint.plotX) {
        path.push(
          'L',
          lastPoint.plotX + arrowWidth * Math.cos(angle),
          lastPoint.plotY - arrowWidth * Math.sin(angle));
        path.push(
          lastPoint.plotX + arrowLength * Math.sin(angle),
          lastPoint.plotY + arrowLength * Math.cos(angle));
        path.push(
          lastPoint.plotX - arrowWidth * Math.cos(angle),
          lastPoint.plotY + arrowWidth * Math.sin(angle),
          'Z');
      } else {
        path.push(
          'L',
          lastPoint.plotX - arrowWidth * Math.cos(angle),
          lastPoint.plotY + arrowWidth * Math.sin(angle));
        path.push(
          lastPoint.plotX - arrowLength * Math.sin(angle),
          lastPoint.plotY - arrowLength * Math.cos(angle));
        path.push(
          lastPoint.plotX + arrowWidth * Math.cos(angle),
          lastPoint.plotY - arrowWidth * Math.sin(angle),
          'Z');
      }

      if (series.arrow) {
        series.arrow.attr({
          d: path
        });
      } else {
        series.arrow = series.chart.renderer.path(path)
          .attr({
            fill: series.color
          })
          .add(series.group);
      }
    });
  }(Highcharts));

您可以轻松调整此代码，使两端都有箭头。

<小时/>

有关包装的文档页面:https://www.highcharts.com/docs/extending-highcharts/extending-highcharts