ts-drawing-components-polygon.md

Polygon

The <Polygon> component is used to draw a polygon.

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

Polygon(value?: {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>	[]	Vertex coordinates of the polygon.
fill	ResourceColor	Color.Black	Color of the fill area.
fillOpacity	number | string | Resource	1	Opacity of the fill area.
stroke	ResourceColor	-	Stroke color. If this attribute is not set, the component does not have any stroke.
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 value when the sharp angle is drawn as a 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 PolygonExample {
  build() {
    Column({ space: 10 }) {
      // Draw a triangle in a 100 x 100 rectangle. The start point is (0, 0), the end point is (100, 0), and the passing point is (50, 100).
      Polygon({ width: 100, height: 100 })
        .points([[0, 0], [50, 100], [100, 0]])
        .fill(Color.Green)
      // Draw a quadrilateral in a 100 x 100 rectangle. The start point is (0, 0), the end point is (100, 0), and the passing points are (0, 100) and (100, 100).
      Polygon().width(100).height(100)
        .points([[0, 0], [0, 100], [100, 100], [100, 0]])
        .fillOpacity(0)
        .strokeWidth(5)
        .stroke(Color.Blue)
      // Draw a pentagon in a 100 x 100 rectangle. The start point is (50, 0), the end point is (100, 50), and the passing points are (0, 50), (20, 100), and (80, 100).
      Polygon().width(100).height(100)
        .points([[50, 0], [0, 50], [20, 100], [80, 100], [100, 50]])
        .fill(Color.Red)
        .fillOpacity(0.6)
    }.width('100%').margin({ top: 10 })
  }
}