harmony 鸿蒙Polyline

  • 2025-06-12
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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(options?: PolylineOptions)

Widget capability: This API can be used in ArkTS widgets since API version 9.

Atomic service API: This API can be used in atomic services since API version 11.

Parameters

Name Type Mandatory Description
options PolylineOptions No Options for drawing a polyline.

PolylineOptions18+

Describes the options for drawing a polyline.

Widget capability: This API can be used in ArkTS widgets since API version 18.

Atomic service API: This API can be used in atomic services since API version 18.

System capability: SystemCapability.ArkUI.ArkUI.Full

Name Type Mandatory Description
width string |number No Width. The value must be greater than or equal to 0.
Default value: 0.
Default unit: vp.
Invalid values are treated as the default value.
height string |number No Height. The value must be greater than or equal to 0.
Default value: 0.
Default unit: vp.
Invalid values are treated as the default value.

Attributes

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

points

points(value: Array<any>)

Sets the list of coordinates that the polyline passes through. Invalid values are treated as the default value.

Widget capability: This API can be used in ArkTS widgets since API version 9.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value Array<Point> Yes List of coordinates that the polyline passes through.
Default value: [].
Default unit: vp

fill

fill(value: ResourceColor)

Sets the color of the fill area. An invalid value is handled as the default value. If this attribute and the universal attribute foregroundColor are both set, whichever is set later takes effect.

Widget capability: This API can be used in ArkTS widgets since API version 9.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value ResourceColor Yes Color of the fill area.
Default value: Color.Black.

fillOpacity

fillOpacity(value: number|string|Resource)

Sets the opacity of the fill area. The value range is [0.0, 1.0]. A value less than 0.0 is treated as 0.0. A value greater than 1.0 is treated as 1.0. Any other value is treated as 1.0.

Widget capability: This API can be used in ArkTS widgets since API version 9.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value number |string |Resource Yes Opacity of the fill area.
Default value: 1.

stroke

stroke(value: ResourceColor)

Sets the stroke color. If this attribute is not set, the component does not have any stroke. If the value is invalid, no stroke will be drawn.

Widget capability: This API can be used in ArkTS widgets since API version 9.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value ResourceColor Yes Stroke color.

strokeDashArray

strokeDashArray(value: Array<any>)

Sets the stroke dashes. Line segments may overlap when they intersect. The value must be greater than or equal to 0. Invalid values are treated as the default value.

Widget capability: This API can be used in ArkTS widgets since API version 9.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value Array<any> Yes Stroke dashes.
Default value: [].
Default unit: vp

strokeDashOffset

strokeDashOffset(value: number|string)

Sets the offset of the line drawing start point. Invalid values are treated as the default value.

Widget capability: This API can be used in ArkTS widgets since API version 9.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value number |string Yes Offset of the start point for drawing the stroke.
Default value: 0.
Default unit: vp

strokeLineCap

strokeLineCap(value: LineCapStyle)

Sets the style of end points of lines.

Widget capability: This API can be used in ArkTS widgets since API version 9.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value LineCapStyle Yes Cap style of the stroke.
Default value: LineCapStyle.Butt

strokeLineJoin

strokeLineJoin(value: LineJoinStyle)

Sets the join style of the stroke.

Widget capability: This API can be used in ArkTS widgets since API version 9.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value LineJoinStyle Yes Join style of lines.
Default value: LineJoinStyle.Miter

strokeMiterLimit

strokeMiterLimit(value: number|string)

Sets the 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. 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.

Widget capability: This API can be used in ArkTS widgets since API version 9.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value number |string Yes Limit on the ratio of the miter length to the value of strokeWidth used to draw a miter join.
Default value: 4

strokeOpacity

strokeOpacity(value: number|string|Resource)

Sets the stroke opacity. The value range is [0.0, 1.0]. A value less than 0.0 is treated as 0.0. A value greater than 1.0 is treated as 1.0. Any other value is treated as 1.0.

Widget capability: This API can be used in ArkTS widgets since API version 9.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value number |string |Resource Yes Stroke opacity.
Default value: 1.

strokeWidth

strokeWidth(value: Length)

Sets the stroke width. If this attribute is of the string type, percentage values are not supported and will be treated as 1 px.

Widget capability: This API can be used in ArkTS widgets since API version 9.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value Length Yes Stroke width. The value must be greater than or equal to 0.
Default value: 1
Default unit: vp.
Invalid values are treated as the default value.

antiAlias

antiAlias(value: boolean)

Specifies whether anti-aliasing is enabled.

Widget capability: This API can be used in ArkTS widgets since API version 9.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value boolean Yes Whether anti-aliasing is enabled.
true: Anti-aliasing is enabled.
false: Anti-aliasing is disabled.
Default value: true

Point

Describes the coordinates of a point.

Widget capability: This API can be used in ArkTS widgets since API version 9.

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

This example demonstrates how to use points, fillOpacity, stroke, strokeLineJoin, and strokeLineCap to draw a polyline with specific coordinates, opacity, stroke colors, corner styles, and endpoint styles.

// 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 rounded corner.
        .strokeLineJoin(LineJoinStyle.Round)
        // Set the cap style of the stroke to a half circle.
        .strokeLineCap(LineCapStyle.Round)
    }.width('100%')
  }
}

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