harmony 鸿蒙Polyline

2022-08-09
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Polyline

The <Polyline> component is used to draw a polyline.

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

Polyline(value?: {width?: string|number, height?: string|number})

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

Parameters

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

Attributes

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

Name	Type	Default Value	Description
points	Array<Point>	[]	List of coordinates that the polyline passes through. Since API version 9, this API is supported in ArkTS widgets. NOTE An invalid value is handled as the default value.
fill	ResourceColor	Color.Black	Color of the fill area. 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	1	Opacity of the fill area. 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. Since API version 9, this API is supported in ArkTS widgets. NOTE An invalid value is handled as the default value.
strokeDashOffset	number \|string	0	Offset of the start point for drawing the stroke. Since API version 9, this API is supported in ArkTS widgets. NOTE An invalid value is handled as the default value.
strokeLineCap	LineCapStyle	LineCapStyle.Butt	Cap style of the stroke. Since API version 9, this API is supported in ArkTS widgets.
strokeLineJoin	LineJoinStyle	LineJoinStyle.Miter	Join style of the stroke. Since API version 9, this API is supported in ArkTS widgets.
strokeMiterLimit	number \|string	4	Limit on the ratio of the miter length to the value of strokeWidth used to draw a miter join. The miter length indicates the distance from the outer tip to the inner corner of the miter. Since API version 9, this API is supported in ArkTS widgets. NOTE This attribute works only when strokeLineJoin is set to LineJoinStyle.Miter. The value must be greater than or equal to 1.0. If the value is in the [0, 1) range, the value 1.0 will be used. In other cases, the default value will be used. Since API version 9, this API is supported in ArkTS widgets.
strokeOpacity	number \|string \|Resource	1	Stroke opacity. 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	1	Stroke width. 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	true	Whether anti-aliasing is enabled. Since API version 9, this API is supported in ArkTS widgets. NOTE An invalid value is handled as the default value.

Point

Describes the coordinates of a point.

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

Name	Type	Description
Point	[number, number]	Coordinates of a point. The first parameter is the x-coordinate, and the second parameter is the y-coordinate (relative coordinate).

Example

// xxx.ets
@Entry
@Component
struct PolylineExample {
  build() {
    Column({ space: 10 }) {
      // Draw a polyline in a 100 x 100 rectangle. The start point is (0, 0), the end point is (100, 100), and the passing point is (20,60).
      Polyline({ width: 100, height: 100 })
        .points([[0, 0], [20, 60], [100, 100]])
        .fillOpacity(0)
        .stroke(Color.Blue)
        .strokeWidth(3)
      // Draw a polyline in a 100 x 100 rectangle. The start point is (20, 0), the end point is (100, 90), and the passing point is (0,100).
      Polyline()
        .width(100)
        .height(100)
        .fillOpacity(0)
        .stroke(Color.Red)
        .strokeWidth(8)
        .points([[20, 0], [0, 100], [100, 90]])
          // Set the join style of the stroke to a round corner.
        .strokeLineJoin(LineJoinStyle.Round)
          // Set the cap style of the stroke to a half circle.
        .strokeLineCap(LineCapStyle.Round)
    }.width('100%')
  }
}

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