角度图添加水平线

问题描述

我想在这里添加水平线 [Chart.js - 绘制水平线 到我的 angular-chart.js(如果我理解正确，我需要做的就是扩展线型图表).

I want add horizontal line like here [Chart.js - draw horizontal line to my angular-chart.js (if I understand right, what I need to do is to extend the line type chart).

我应该如何以及在哪里做(编写自己的指令，尝试在 angular .config 中扩展 char.js)?

How and where I should do it (write own directive, try extend the char.js in angular .config)?

推荐答案

首先，您需要使用您在帖子中提到的扩展来扩展 Chart.js，如下所示:(使用 @jbman223 片段)

First of all, you need to extends Chart.js with the extend you mentionned in your post, like this : (using @jbman223 snippet)

// Extend chart.js with a new type of chart
Chart.types.Line.extend({
   name: "LineWithLine",
   initialize: function () {
      Chart.types.Line.prototype.initialize.apply(this, arguments);
   },
   draw: function () {
    Chart.types.Line.prototype.draw.apply(this, arguments);

    // Needs to be set with angular-chart options
    var lineAtIndex = 2;

    var point = this.datasets[0].points[lineAtIndex]
    var scale = this.scale
    console.log(this);

    // draw line
    this.chart.ctx.beginPath();
    this.chart.ctx.moveTo(scale.startPoint+12, point.y);
    this.chart.ctx.strokeStyle = '#ff0000';
    this.chart.ctx.lineTo(this.chart.width, point.y);
    this.chart.ctx.stroke();

    // write TODAY
    this.chart.ctx.textAlign = 'center';
    this.chart.ctx.fillText("TODAY", scale.startPoint + 35, point.y+10);
}
});

然后，我们必须将这个新的图表类型与角度图表联系起来.不幸的是，它是一个高级抽象库，因此没有内置功能.因此，到目前为止，我发现这样做的唯一方法是通过在配置中添加一行来修改 angular-chart.js:

Then, we have to link this new Chart type with angular-chart. Unfortunately, it is a high level of abstraction library, so there is no built-in feature for that. So, the only way I have found to do that so far is to modify angular-chart.js by adding a line in the config :

  return angular.module('chart.js', [])
  .provider('ChartJs', ChartJsProvider)
  .factory('ChartJsFactory', ['ChartJs', '$timeout', ChartJsFactory])
  //...
  .directive('chartLinebis', ['ChartJsFactory', function (ChartJsFactory) { return new ChartJsFactory('LineWithLine'); }]);

最后，用你的新图表标签调用 angular-chart :

Finally, call angular-chart with your new chart label :

      <canvas class="chart chart-linebis" chart-data="data" chart-labels="labels" chart-legend="true" chart-series="series"></canvas>

请注意，js 导入遵守此顺序非常重要:chart.js -> myExtend.js -> angular-chart.js

Note that it is very important that the js imports respect this order : chart.js -> myExtend.js -> angular-chart.js

JSFiddle (免责声明:我在片段中间包含了 angular-chart.js进口订单目的)

JSFiddle (disclaimer : I included angular-chart.js in the middle of the snippet for import order purpose)

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