harmony 鸿蒙Circle

2022-08-09
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Circle

The <Circle> component is used to draw a circle.

NOTE

This component is supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version.

Child Components

Not supported

APIs

Circle(options?: {width?: string|number, height?: string|number})

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

Parameters

Name	Type	Mandatory	Description
width	string \|number	No	Width of the circle. Default value: 0 NOTE An invalid value is handled as the default value.
height	string \|number	No	Height of the circle. Default value: 0 NOTE An invalid value is handled as the default value.

Attributes

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

Name	Type	Description
fill	ResourceColor	Color of the fill area. Default value: Color.Black Since API version 9, this API is supported in ArkTS widgets. NOTE An invalid value is handled as the default value.
fillOpacity	number \|string \|Resource	Opacity of the fill area. Default value: 1 Since API version 9, this API is supported in ArkTS widgets. NOTE An invalid value is handled as the default value.
stroke	ResourceColor	Stroke color. If this attribute is not set, the component does not have any stroke. Since API version 9, this API is supported in ArkTS widgets. NOTE If the value is invalid, no stroke will be drawn.
strokeDashArray	Array<Length>	Stroke dashes. Default value: [] Since API version 9, this API is supported in ArkTS widgets. NOTE An invalid value is handled as the default value.
strokeDashOffset	number \|string	Offset of the start point for drawing the stroke. Default value: 0 Since API version 9, this API is supported in ArkTS widgets. NOTE An invalid value is handled as the default value.
strokeLineCap	LineCapStyle	Cap style of the stroke. Default value: LineCapStyle.Butt Since API version 9, this API is supported in ArkTS widgets.
strokeLineJoin	LineJoinStyle	Join style of the stroke. Default value: LineJoinStyle.Miter Since API version 9, this API is supported in ArkTS widgets.
strokeMiterLimit	number \|string	Limit on the ratio of the miter length to the value of strokeWidth used to draw a miter join. Default value: 4 Since API version 9, this API is supported in ArkTS widgets. NOTE This attribute does not take effect for the <Circle> component, because it does not have a miter join.
strokeOpacity	number \|string \|Resource	Stroke opacity. Default value: 1 Since API version 9, this API is supported in ArkTS widgets. NOTE The value range is [0.0, 1.0]. A value less than 0.0 evaluates to the value 0.0. A value greater than 1.0 evaluates to the value 1.0. Any other value evaluates to the value 1.0.
strokeWidth	Length	Stroke width. Default value: 1 Since API version 9, this API is supported in ArkTS widgets. NOTE The value cannot be a percentage. An invalid value is handled as the default value.
antiAlias	boolean	Whether anti-aliasing is enabled. Default value: true Since API version 9, this API is supported in ArkTS widgets.

Example

// xxx.ets
@Entry
@Component
struct CircleExample {
  build() {
    Column({ space: 10 }) {
      // Draw a circle whose diameter is 150.
      Circle({ width: 150, height: 150 })
      // Draw a circle whose diameter is 150 and stroke color is red. (If the width and height values are different, the smaller value will be used as the diameter.)
      Circle()
        .width(150)
        .height(200)
        .fillOpacity(0)
        .strokeWidth(3)
        .stroke(Color.Red)
        .strokeDashArray([1, 2])
    }.width('100%')
  }
}

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