harmony 鸿蒙Gauge

2022-08-09
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Gauge

The <Gauge> component is used to display data in a ring chart.

NOTE

This component is supported since API version 8. Updates will be marked with a superscript to indicate their earliest API version.

Child Components

Not supported

APIs

Gauge(options:{value: number, min?: number, max?: number})

Since API version 9, this API is supported in ArkTS widgets.

Parameters

Name	Type	Mandatory	Description
value	number	Yes	Current value of the chart, that is, the position to which the pointer points in the chart. It is used as the initial value of the chart when the component is created. NOTE If the value is not within the range defined by the min and max parameters, the value of min is used.
min	number	No	Minimum value of the current data segment. Default value: 0
max	number	No	Maximum value of the current data segment. Default value: 100 NOTE If the value of max is less than that of min, the default values 0 and 100 are used. The values of max and min can be negative numbers.

Attributes

In addition to the universal attributes, the following attributes are supported.

Name	Type	Description
value	number	Value of the chart. It can be dynamically changed. Default value: 0 Since API version 9, this API is supported in ArkTS widgets.
startAngle	number	Start angle of the chart. The value 0 indicates 0 degrees, and a positive value indicates the clockwise direction. Default value: 0 Since API version 9, this API is supported in ArkTS widgets.
endAngle	number	End angle of the chart. The value 0 indicates 0 degrees, and a positive value indicates the clockwise direction. Default value: 360 Since API version 9, this API is supported in ArkTS widgets.
colors	Array<[ResourceColor, number]>	Colors of the chart. Colors can be set for individual segments. Default value: Color.Black Since API version 9, this API is supported in ArkTS widgets. NOTE The first parameter indicates the color value. If it is set to a non-color value, the black color is used. The second parameter indicates the color weight. If it is set to a negative number or a non-numeric value, the color weight is 0.
strokeWidth	Length	Stroke width of the chart. Default value: 4 Unit: vp Since API version 9, this API is supported in ArkTS widgets. NOTE A value less than or equal to 0 evaluates to the default value. The value cannot be in percentage.

Example

// xxx.ets
@Entry
@Component
struct GaugeExample {
  build() {
    Column({ space: 20 }) {
      // Use the default value of min and max, which is 0-100, and the default values of startAngle and endAngle, which are 0 and 360, respectively.
      // Set the current value to 75.
      Gauge({ value: 75 })
        .width(200).height(200)
        .colors([[0x317AF7, 1], [0x5BA854, 1], [0xE08C3A, 1], [0x9C554B, 1]])
      
      // Set the value parameter to 75 and the value attribute to 25. The attribute setting is used.
      Gauge({ value: 75 })
        .value(25) // If both the attribute and parameter are set, the attribute setting is used.
        .width(200).height(200)
        .colors([[0x317AF7, 1], [0x5BA854, 1], [0xE08C3A, 1], [0x9C554B, 1]])
      
      // A ring chart of 210 to 150 degrees
      Gauge({ value: 30, min: 0, max: 100 })
        .startAngle(210)
        .endAngle(150)
        .colors([[0x317AF7, 0.1], [0x5BA854, 0.2], [0xE08C3A, 0.3], [0x9C554B, 0.4]])
        .strokeWidth(20)
        .width(200)
        .height(200)
    }.width('100%').margin({ top: 5 })
  }
}

gauge