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

Parameters

Name	Type	Mandatory	Default Value	Description
width	string \| number	No	0	Width.
height	string \| number	No	0	Height.

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.
fill	ResourceColor	Color.Black	Color of the fill area.
fillOpacity	number \| string \| Resource	1	Opacity of the fill area.
stroke	ResourceColor	-	Stroke color.
strokeDashArray	Array<Length>	[]	Stroke dashes.
strokeDashOffset	number \| string	0	Offset of the start point for drawing the stroke.
strokeLineCap	LineCapStyle	LineCapStyle.Butt	Cap style of the stroke.
strokeLineJoin	LineJoinStyle	LineJoinStyle.Miter	Join style of the stroke.
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. NOTE This attribute must be set to a value greater than or equal to 1 and takes effect when strokeLineJoin is set to LineJoinStyle.Miter.
strokeOpacity	number \| string \| Resource	1	Stroke opacity. NOTE The value range is [0.0, 1.0]. If the set value is less than 0.0, 0.0 will be used. If the set value is greater than 1.0, 1.0 will be used.
strokeWidth	Length	1	Stroke width.
antiAlias	boolean	true	Whether anti-aliasing is enabled.

Point

Describes the coordinates of a point.

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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