ts-components-canvas-path2d.md

# Path2D

>  **NOTE**
>
>  The APIs of this module are supported since API version 8. Updates will be marked with a superscript to indicate their earliest API version.


**Path2D** allows you to describe a path through an existing path. This path can be drawn through the **stroke** API of **Canvas**.


## addPath

addPath(path: path2D, transform?:Matrix2D): void

Adds a path to this path.

**Parameters**

| Name| Type| Mandatory| Default Value| Description|
| -------- | -------- | -------- | -------- | -------- |
| path | path2D | Yes| - | Path to be added to this path.|
| transform | Matrix2D | No| null | Transformation matrix of the new path.|


**Example**

  ```ts
  // xxx.ets
  @Entry
  @Component
  struct AddPath {
    private settings: RenderingContextSettings = new RenderingContextSettings(true)
    private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
  
    private path2Da: Path2D = new Path2D("M250 150 L150 350 L350 350 Z")
    private path2Db: Path2D = new Path2D()
  
    build() {
      Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
        Canvas(this.context)
          .width('100%')
          .height('100%')
          .backgroundColor('#ffff00')
          .onReady(() =>{
            this.path2Db.addPath(this.path2Da)
            this.context.stroke(this.path2Db)
          })
      }
      .width('100%')
      .height('100%')
    }
  }
  ```

  ![en-us_image_0000001211898520](figures/en-us_image_0000001211898520.png)


## closePath

closePath(): void

Moves the current point of the path back to the start point of the path, and draws a straight line between the current point and the start point. If the shape has already been closed or has only one point, this method does nothing.

**Example**

  ```ts
  // xxx.ets
  @Entry
  @Component
  struct ClosePath {
    private settings: RenderingContextSettings = new RenderingContextSettings(true)
    private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
    private path2Db: Path2D = new Path2D()
  
    build() {
      Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
        Canvas(this.context)
          .width('100%')
          .height('100%')
          .backgroundColor('#ffff00')
          .onReady(() =>{
            this.path2Db.moveTo(200, 100)
            this.path2Db.lineTo(300, 100)
            this.path2Db.lineTo(200, 200)
            this.path2Db.closePath()
            this.context.stroke(this.path2Db)
          })
      }
      .width('100%')
      .height('100%')
    }
  }
  ```

  ![en-us_image_0000001212218482](figures/en-us_image_0000001212218482.png)


## moveTo

moveTo(x: number, y: number): void

Moves the current coordinate point of the path to the target point, without drawing a line during the movement.

**Parameters**

| Name| Type| Mandatory| Default Value| Description|
| -------- | -------- | -------- | -------- | -------- |
| x | number | Yes| 0 | X-coordinate of the target point.|
| y | number | Yes| 0 | Y-coordinate of the target point.|

**Example**

  ```ts
  // xxx.ets
  @Entry
  @Component
  struct MoveTo {
    private settings: RenderingContextSettings = new RenderingContextSettings(true)
    private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
    private path2Db: Path2D = new Path2D()
  
    build() {
      Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
        Canvas(this.context)
          .width('100%')
          .height('100%')
          .backgroundColor('#ffff00')
          .onReady(() =>{
            this.path2Db.moveTo(50, 100)
            this.path2Db.lineTo(250, 100)
            this.path2Db.lineTo(150, 200)
            this.path2Db.closePath()
            this.context.stroke(this.path2Db)
          })
      }
      .width('100%')
      .height('100%')
    }
  }
  ```

  ![en-us_image_0000001257138389](figures/en-us_image_0000001257138389.png)


## lineTo

lineTo(x: number, y: number): void

Draws a straight line from the current point to the target point.

**Parameters**

| Name| Type| Mandatory| Default Value| Description|
| -------- | -------- | -------- | -------- | -------- |
| x | number | Yes| 0 | X-coordinate of the target point.|
| y | number | Yes| 0 | Y-coordinate of the target point.|

**Example**

  ```ts
  // xxx.ets
  @Entry
  @Component
  struct LineTo {
    private settings: RenderingContextSettings = new RenderingContextSettings(true)
    private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
    private path2Db: Path2D = new Path2D()
  
    build() {
      Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
        Canvas(this.context)
          .width('100%')
          .height('100%')
          .backgroundColor('#ffff00')
          .onReady(() =>{
            this.path2Db.moveTo(100, 100)
            this.path2Db.lineTo(100, 200)
            this.path2Db.lineTo(200, 200)
            this.path2Db.lineTo(200, 100)
            this.path2Db.closePath()
            this.context.stroke(this.path2Db)
          })
      }
      .width('100%')
      .height('100%')
    }
  }
  ```

  ![en-us_image_0000001256858435](figures/en-us_image_0000001256858435.png)


## bezierCurveTo

bezierCurveTo(cp1x: number, cp1y: number, cp2x: number, cp2y: number, x: number, y: number): void

Draws a cubic bezier curve on the canvas.

**Parameters**

| Name| Type| Mandatory| Default Value| Description|
| -------- | -------- | -------- | -------- | -------- |
| cp1x | number | Yes| 0 | X-coordinate of the first parameter of the bezier curve.|
| cp1y | number | Yes| 0 | Y-coordinate of the first parameter of the bezier curve.|
| cp2x | number | Yes| 0 | X-coordinate of the second parameter of the bezier curve.|
| cp2y | number | Yes| 0 | Y-coordinate of the second parameter of the bezier curve.|
| x | number | Yes| 0 | X-coordinate of the end point on the bezier curve.|
| y | number | Yes| 0 | Y-coordinate of the end point on the bezier curve.|

**Example**

  ```ts
  // xxx.ets
  @Entry
  @Component
  struct BezierCurveTo {
    private settings: RenderingContextSettings = new RenderingContextSettings(true)
    private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
    private path2Db: Path2D = new Path2D()
  
    build() {
      Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
        Canvas(this.context)
          .width('100%')
          .height('100%')
          .backgroundColor('#ffff00')
          .onReady(() =>{
            this.path2Db.moveTo(10, 10)
            this.path2Db.bezierCurveTo(20, 100, 200, 100, 200, 20);this.context.stroke(this.path2Db)
          })
      }
      .width('100%')
      .height('100%')
    }
  }
  ```

  ![en-us_image_0000001257058445](figures/en-us_image_0000001257058445.png)


## quadraticCurveTo

quadraticCurveTo(cpx: number, cpy: number, x: number ,y: number): void

Draws a quadratic curve on the canvas.

**Parameters**

| Name| Type| Mandatory| Default Value| Description|
| -------- | -------- | -------- | -------- | -------- |
| cpx | number | Yes| 0 | X-coordinate of the bezier curve parameter.|
| cpy | number | Yes| 0 | Y-coordinate of the bezier curve parameter.|
| x | number | Yes| 0 | X-coordinate of the end point on the bezier curve.|
| y | number | Yes| 0 | Y-coordinate of the end point on the bezier curve.|

**Example**

  ```ts
  // xxx.ets
  @Entry
  @Component
  struct QuadraticCurveTo {
    private settings: RenderingContextSettings = new RenderingContextSettings(true)
    private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
    private path2Db: Path2D = new Path2D()
  
    build() {
      Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
        Canvas(this.context)
          .width('100%')
          .height('100%')
          .backgroundColor('#ffff00')
          .onReady(() =>{
            this.path2Db.moveTo(10, 10)
            this.path2Db.quadraticCurveTo(100, 100, 200, 20)
            this.context.stroke(this.path2Db)
        })
      }
      .width('100%')
      .height('100%')
    }
  }
  ```

  ![en-us_image_0000001212058512](figures/en-us_image_0000001212058512.png)


## arc

arc(x: number, y: number, radius: number, startAngle: number, endAngle: number, counterclockwise?: boolean): void

Draws an arc on the canvas.

**Parameters**

| Name| Type| Mandatory| Default Value| Description|
| -------- | -------- | -------- | -------- | -------- |
| x | number | Yes| 0 | X-coordinate of the center point of the arc.|
| y | number | Yes| 0 | Y-coordinate of the center point of the arc.|
| radius | number | Yes| 0 | Radius of the arc.|
| startAngle | number | Yes| 0 | Start radian of the arc.|
| endAngle | number | Yes| 0 | End radian of the arc.|
| counterclockwise | boolean | No| false | Whether to draw the arc counterclockwise.|

**Example**

  ```ts
  // xxx.ets
  @Entry
  @Component
  struct Arc {
    private settings: RenderingContextSettings = new RenderingContextSettings(true)
    private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
    private path2Db: Path2D = new Path2D()
  
    build() {
      Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
        Canvas(this.context)
          .width('100%')
          .height('100%')
          .backgroundColor('#ffff00')
          .onReady(() =>{
            this.path2Db.arc(100, 75, 50, 0, 6.28);this.context.stroke(this.path2Db)
          })
      }
      .width('100%')
      .height('100%')
    }
  }
  ```

  ![en-us_image_0000001212378446](figures/en-us_image_0000001212378446.png)


## arcTo

arcTo(x1: number, y1: number, x2: number, y2: number, radius: number): void

Draws an arc based on the radius and points on the arc.

**Parameters**

| Name| Type| Mandatory| Default Value| Description|
| -------- | -------- | -------- | -------- | -------- |
| x1 | number | Yes| 0 | X-coordinate of the first point on the arc.|
| y1 | number | Yes| 0 | Y-coordinate of the first point on the arc.|
| x2 | number | Yes| 0 | X-coordinate of the second point on the arc.|
| y2 | number | Yes| 0 | Y-coordinate of the second point on the arc.|
| radius | number | Yes| 0 | Radius of the arc.|

**Example**

  ```ts
  // xxx.ets
  @Entry
  @Component
  struct ArcTo {
    private settings: RenderingContextSettings = new RenderingContextSettings(true)
    private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
    private path2Db: Path2D = new Path2D()
  
    build() {
      Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
        Canvas(this.context)
          .width('100%')
          .height('100%')
          .backgroundColor('#ffff00')
          .onReady(() =>{
            this.path2Db.arcTo(150, 20, 150, 70, 50)
            this.context.stroke(this.path2Db)
          })
      }
      .width('100%')
      .height('100%')
    }
  }
  ```

  ![en-us_image_0000001212058510](figures/en-us_image_0000001212058510.png)


## ellipse

ellipse(x: number, y: number, radiusX: number, radiusY: number, rotation: number, startAngle: number, endAngle: number, counterclockwise?: number): void

Draws an ellipse in the specified rectangular region on the canvas.

**Parameters**

| Name| Type| Mandatory| Default Value| Description|
| -------- | -------- | -------- | -------- | -------- |
| x | number | Yes| 0 | X-coordinate of the ellipse center.|
| y | number | Yes| 0 | Y-coordinate of the ellipse center.|
| radiusX | number | Yes| 0 | Ellipse radius on the x-axis.|
| radiusY | number | Yes| 0 | Ellipse radius on the y-axis.|
| rotation | number | Yes| 0 | Rotation angle of the ellipse. The unit is radian.|
| startAngle | number | Yes| 0 | Angle of the start point for drawing the ellipse. The unit is radian.|
| endAngle | number | Yes| 0 | Angle of the end point for drawing the ellipse. The unit is radian.|
| counterclockwise | number | No| 0 | Whether to draw the ellipse counterclockwise. The value **0** means to draw the ellipse clockwise, and **1** means to draw the ellipse counterclockwise. This parameter is optional. The default value is **0**. |

**Example**

  ```ts
  // xxx.ets
  @Entry
  @Component
  struct CanvasExample {
    private settings: RenderingContextSettings = new RenderingContextSettings(true)
    private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
    private path2Db: Path2D = new Path2D()
  
    build() {
      Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
        Canvas(this.context)
          .width('100%')
          .height('100%')
          .backgroundColor('#ffff00')
          .onReady(() =>{
            this.path2Db.ellipse(200, 200, 50, 100, Math.PI * 0.25, Math.PI * 0.5, Math.PI)
            this.context.stroke(this.path2Db)
          })
      }
      .width('100%')
      .height('100%')
    }
  }
  ```

  ![en-us_image_0000001257138391](figures/en-us_image_0000001257138391.png)


## rect

rect(x: number, y: number, w: number, h: number): void

Creates a rectangle on the canvas.

**Parameters**

| Name| Type| Mandatory| Default Value| Description|
| -------- | -------- | -------- | -------- | -------- |
| x | number | Yes| 0 | X-coordinate of the upper left corner of the rectangle.|
| y | number | Yes| 0 | Y-coordinate of the upper left corner of the rectangle.|
| w | number | Yes| 0 | Width of the rectangle.|
| h | number | Yes| 0 | Height of the rectangle.|

**Example**

  ```ts
  // xxx.ets
  @Entry
  @Component
  struct CanvasExample {
    private settings: RenderingContextSettings = new RenderingContextSettings(true)
    private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
    private path2Db: Path2D = new Path2D()
  
    build() {
      Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
        Canvas(this.context)
          .width('100%')
          .height('100%')
          .backgroundColor('#ffff00')
          .onReady(() =>{
            this.path2Db.rect(20, 20, 100, 100);this.context.stroke(this.path2Db)
          })
      }
      .width('100%')
      .height('100%')
    }
  }
  ```

  ![en-us_image_0000001256978385](figures/en-us_image_0000001256978385.png)