echarts adds dimension lines

This article covers the methods and properties for adding annotation lines to Echarts charts. It explains how to position their start and end points, as well as customize their appearance and text. The focus is on the use of the addAnnotationLine() m

How to Add Annotation Lines in Echarts?

To add an annotation line to an Echarts chart, use theaddAnnotationLine()method. This method takes two parameters: an object specifying the line's configuration, and the chart's instance.addAnnotationLine()method. This method takes two parameters: an object specifying the line's configuration, and the chart's instance.

Here's an example of how to use theaddAnnotationLine()method:

const myChart = echarts.init(document.getElementById('myChart')); const line = { type: 'line', // 'line', 'curve' x: [10, 20], // Coordinates of the line's starting and ending points. y: [10, 20], symbol: ['none', 'none'], // Symbols at the starting and ending points. label: { // Label attached to the line. show: true, formatter: 'annotation line' } }; myChart.addAnnotationLine(line);

How to Position Annotation Lines' Start and End Points in Echarts?

The starting and ending points of an annotation line can be positioned using thexandy

Here's an example of how to use the addAnnotationLine()method:

const line = { x: [10, 20], y: [10, 20] };

How to Position Annotation Lines' Start and End Points in Echarts?

The starting and ending points of an annotation line can be positioned using the xand yproperties of the line's configuration object. Each property accepts an array of two numbers, representing the X and Y coordinates of the point.

For example, the following configuration positions the line to start at (10, 10) and end at (20, 20):

const line = { lineStyle: { color: 'red', width: 2 }, symbol: ['circle', 'circle'], label: { show: true, formatter: 'Custom Annotation Line' } };

How to Customize Annotation Lines' Appearance and Text in Echarts?To customize the appearance and text of an annotation line, use the following properties in the line's configuration object:

lineStyle

: This property controls the line's color, width, and type.

symbol

: This property controls the shape and size of the symbols at the starting and ending points.

label: This property controls the appearance and text of the label attached to the line.For example, the following configuration sets the line's color to red, its width to 2, and the label's text to "Custom Annotation Line":rrreee

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