[英]angular-chart add horizontal line
首先,您需要使用您在帖子中提到的擴展來擴展Chart.js,如下所示:(使用@ jbman223片段)
// 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,我們必須將此新的Chart類型與angular-chart鏈接。 不幸的是,它是高級抽象庫,因此沒有內置功能。 因此,到目前為止,我發現這樣做的唯一方法是通過在config中添加一行來修改angular-chart.js:
return angular.module('chart.js', [])
.provider('ChartJs', ChartJsProvider)
.factory('ChartJsFactory', ['ChartJs', '$timeout', ChartJsFactory])
//...
.directive('chartLinebis', ['ChartJsFactory', function (ChartJsFactory) { return new ChartJsFactory('LineWithLine'); }]);
最后,使用新的圖表標簽調用angular-chart:
<canvas class="chart chart-linebis" chart-data="data" chart-labels="labels" chart-legend="true" chart-series="series"></canvas>
請注意,js導入必須遵守此順序,這一點非常重要:chart.js-> myExtend.js-> angular-chart.js
JSFiddle (免責聲明:出於引入訂單的目的,我在代碼段的中間添加了angular-chart.js)
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