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未验证 提交 0fa2c5c5 编写于 作者: O openharmony_ci 提交者： Gitee
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!10703 canvas文档整改 

Merge pull request !10703 from lanyi/cherry-pick-1666000797
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zh-cn/application-dev/reference/arkui-ts/Readme-CN.md
浏览文件 @ 0fa2c5c5
......@@ -132,12 +132,12 @@
- 画布组件
- [Canvas](ts-components-canvas-canvas.md)
- [CanvasRenderingContext2D对象](ts-canvasrenderingcontext2d.md)
- [OffscreenCanvasRenderingContext2D对象](ts-offscreencanvasrenderingcontext2d.md)
- [Lottie](ts-components-canvas-lottie.md)
- [Path2D对象](ts-components-canvas-path2d.md)
- [CanvasGradient对象](ts-components-canvas-canvasgradient.md)
- [ImageBitmap对象](ts-components-canvas-imagebitmap.md)
- [ImageData对象](ts-components-canvas-imagedata.md)
- [OffscreenCanvasRenderingContext2D对象](ts-offscreencanvasrenderingcontext2d.md)
- [Path2D对象](ts-components-canvas-path2d.md)
- [Lottie](ts-components-canvas-lottie.md)
- 动画
......
zh-cn/application-dev/reference/arkui-ts/ts-canvasrenderingcontext2d.md
浏览文件 @ 0fa2c5c5
# CanvasRenderingContext2D对象
使用RenderingContext在Canvas组件上进行绘制，绘制对象可以是矩形、文本、图片等。
> **说明：**
>
> 从API Version 8开始支持。后续版本如有新增内容，则采用上角标单独标记该内容的起始版本。
使用RenderingContext在Canvas组件上进行绘制，绘制对象可以是矩形、文本、图片等。
## 接口
......@@ -723,6 +723,7 @@ strokeRect(x: number, y: number, w: number, h: number): void
struct StrokeRect {
private settings: RenderingContextSettings = new RenderingContextSettings(true);
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings);
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -766,6 +767,7 @@ clearRect(x: number, y: number, w: number, h: number): void
struct ClearRect {
private settings: RenderingContextSettings = new RenderingContextSettings(true);
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings);
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -774,8 +776,8 @@ clearRect(x: number, y: number, w: number, h: number): void
.backgroundColor('#ffffff')
.onReady(() =>{
this.context.fillStyle = 'rgb(0,0,255)'
this.context.fillRect(0,0,500,500)
this.context.clearRect(20,20,150,100)
this.context.fillRect(20,20,200,200)
this.context.clearRect(30,30,150,100)
})
}
.width('100%')
......@@ -811,6 +813,7 @@ fillText(text: string, x: number, y: number, maxWidth?: number): void
struct FillText {
private settings: RenderingContextSettings = new RenderingContextSettings(true);
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings);
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -855,6 +858,7 @@ strokeText(text: string, x: number, y: number, maxWidth?:number): void
struct StrokeText {
private settings: RenderingContextSettings = new RenderingContextSettings(true);
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings);
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -923,6 +927,7 @@ measureText(text: string): TextMetrics
struct MeasureText {
private settings: RenderingContextSettings = new RenderingContextSettings(true);
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings);
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -975,6 +980,8 @@ stroke(path?: Path2D): void
.onReady(() =>{
this.context.moveTo(25, 25)
this.context.lineTo(25, 105)
this.context.lineTo(75, 105)
this.context.lineTo(75, 25)
this.context.strokeStyle = 'rgb(0,0,255)'
this.context.stroke()
})
......@@ -1437,7 +1444,7 @@ ellipse(x: number, y: number, radiusX: number, radiusY: number, rotation: number
.backgroundColor('#ffff00')
.onReady(() =>{
this.context.beginPath()
this.context.ellipse(200, 200, 50, 100, Math.PI * 0.25, Math.PI * 0.5, Math.PI)
this.context.ellipse(200, 200, 50, 100, Math.PI * 0.25, Math.PI * 0.5, Math.PI * 2)
this.context.stroke()
})
}
......@@ -1618,11 +1625,11 @@ clip(fillRule?: CanvasFillRule): void
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.context.rect(0, 0, 200, 200)
this.context.rect(0, 0, 100, 200)
this.context.stroke()
this.context.clip()
this.context.fillStyle = "rgb(255,0,0)"
this.context.fillRect(0, 0, 150, 150)
this.context.fillRect(0, 0, 200, 200)
})
}
.width('100%')
......@@ -1636,7 +1643,7 @@ clip(fillRule?: CanvasFillRule): void
clip(path: Path2D, fillRule?: CanvasFillRule): void
对封闭路径进行填充。该接口为空接口。
设置当前路径为剪切路径
**参数:**
......@@ -1646,6 +1653,38 @@ clip(path: Path2D, fillRule?: CanvasFillRule): void
| fillRule | CanvasFillRule | 否 | "nonzero" | 指定要剪切对象的规则。<br/>可选参数为："nonzero", "evenodd"。 |
**示例:**
```ts
// xxx.ets
@Entry
@Component
struct Clip {
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
.width('100%')
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
let region = new Path2D();
region.rect(80,10,20,130);
region.rect(40,50,100,50);
this.context.clip(region,"evenodd")
this.context.fillStyle = "rgb(255,0,0)"
this.context.fillRect(0, 0, this.context.width, this.context.height)
})
}
.width('100%')
.height('100%')
}
}
```
![zh-cn_image_000000127777779](figures/zh-cn_image_000000127777779.png)
### filter
......@@ -1753,9 +1792,10 @@ scale(x: number, y: number): void
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.context.strokeRect(10, 10, 25, 25)
this.context.lineWidth = 3
this.context.strokeRect(30, 30, 50, 50)
this.context.scale(2, 2) // Scale to 200%
this.context.strokeRect(10, 10, 25, 25)
this.context.strokeRect(30, 30, 50, 50)
})
}
.width('100%')
......@@ -1985,7 +2025,7 @@ drawImage(image: ImageBitmap | PixelMap, sx: number, sy: number, sw: number, sh:
createImageData(sw: number, sh: number): ImageData
创建新的ImageData 对象，请参考[ImageData](ts-components-canvas-imagebitmap.md)。
创建新的ImageData 对象，请参考[ImageData](ts-components-canvas-imagedata.md)。
**参数：**
......@@ -1995,23 +2035,21 @@ createImageData(sw: number, sh: number): ImageData
| sh | number | 是 | 0 | ImageData的高度。 |
### createImageData
createImageData(imageData: ImageData): ImageData
创建新的ImageData 对象，请参考[ImageData](ts-components-canvas-imagebitmap.md)。
创建新的ImageData 对象，请参考[ImageData](ts-components-canvas-imagedata.md)。
**参数：**
| 参数 | 类型 | 必填 | 默认 | 描述 |
| --------- | ---------------------------------------- | ---- | ---- | ----------------- |
| imagedata | [ImageData](ts-components-canvas-imagebitmap.md) | 是 | null | 复制现有的ImageData对象。 |
| imagedata | [ImageData](ts-components-canvas-imagedata.md) | 是 | null | 复制现有的ImageData对象。 |
**返回值：**
| 类型 | 说明 |
| ---------------------------------------- | -------------- |
| [ImageData](ts-components-canvas-imagebitmap.md) | 新的ImageData对象。 |
| [ImageData](ts-components-canvas-imagedata.md) | 新的ImageData对象。 |
### getPixelMap
......@@ -2039,7 +2077,7 @@ getPixelMap(sx: number, sy: number, sw: number, sh: number): PixelMap
getImageData(sx: number, sy: number, sw: number, sh: number): ImageData
以当前canvas指定区域内的像素创建[ImageData](ts-components-canvas-imagebitmap.md)对象。
以当前canvas指定区域内的像素创建[ImageData](ts-components-canvas-imagedata.md)对象。
**参数：**
......@@ -2054,7 +2092,39 @@ getImageData(sx: number, sy: number, sw: number, sh: number): ImageData
| 类型 | 说明 |
| ---------------------------------------- | -------------- |
| [ImageData](ts-components-canvas-imagebitmap.md) | 新的ImageData对象。 |
| [ImageData](ts-components-canvas-imagedata.md) | 新的ImageData对象。 |
**示例：**
```ts
// xxx.ets
@Entry
@Component
struct GetImageData {
private settings: RenderingContextSettings = new RenderingContextSettings(true);
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings);
private img:ImageBitmap = new ImageBitmap("/common/images/1234.png")
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
.width('100%')
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.context.drawImage(this.img,0,0,130,130);
var imagedata = this.context.getImageData(50,50,130,130);
this.context.putImageData(imagedata,150,150);
})
}
.width('100%')
.height('100%')
}
}
```
![zh-cn_image_000000127777780](figures/zh-cn_image_000000127777780.png)
### putImageData
......@@ -2063,13 +2133,13 @@ putImageData(imageData: ImageData, dx: number, dy: number): void
putImageData(imageData: ImageData, dx: number, dy: number, dirtyX: number, dirtyY: number, dirtyWidth: number, dirtyHeight: number): void
使用[ImageData](ts-components-canvas-imagebitmap.md)数据填充新的矩形区域。
使用[ImageData](ts-components-canvas-imagedata.md)数据填充新的矩形区域。
**参数：**
| 参数 | 类型 | 必填 | 默认值 | 描述 |
| ----------- | ---------------------------------------- | ---- | ------------ | ----------------------------- |
| imagedata | [ImageData](ts-components-canvas-imagebitmap.md) | 是 | null | 包含像素值的ImageData对象。 |
| imagedata | [ImageData](ts-components-canvas-imagedata.md) | 是 | null | 包含像素值的ImageData对象。 |
| dx | number | 是 | 0 | 填充区域在x轴方向的偏移量。 |
| dy | number | 是 | 0 | 填充区域在y轴方向的偏移量。 |
| dirtyX | number | 否 | 0 | 源图像数据矩形裁切范围左上角距离源图像左上角的x轴偏移量。 |
......@@ -2144,6 +2214,7 @@ setLineDash(segments: number[]): void
.onReady(() =>{
this.context.arc(100, 75, 50, 0, 6.28)
this.context.setLineDash([10,20])
this.context.stroke()
})
}
.width('100%')
......@@ -2167,24 +2238,34 @@ getLineDash(): number[]
| -------- | ------------------------ |
| number[] | 返回数组，该数组用来描述线段如何交替和间距长度。 |
**示例：**
```ts
// xxx.ets
@Entry
@Component
struct GetLineDash {
@Entry
@Component
struct CanvasGetLineDash {
@State message: string = 'Hello World'
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Row() {
Column() {
Text(this.message)
.fontSize(50)
.fontWeight(FontWeight.Bold)
.onClick(()=>{
console.error('before getlinedash clicked')
let res = this.context.getLineDash()
console.error(JSON.stringify(res))
})
Canvas(this.context)
.width('100%')
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
var grad = this.context.createLinearGradient(50,0, 300,100)
.onReady(() => {
this.context.arc(100, 75, 50, 0, 6.28)
this.context.setLineDash([10,20])
this.context.stroke();
......@@ -2192,10 +2273,13 @@ getLineDash(): number[]
})
}
.width('100%')
.height('100%')
}
.height('100%')
}
}
```
![zh-cn_image_000000127777778](figures/zh-cn_image_000000127777778.png)
### imageSmoothingQuality
......@@ -2222,7 +2306,7 @@ transferFromImageBitmap(bitmap: ImageBitmap): void
| 参数 | 类型 | 描述 |
| ------ | ---------------------------------------- | ------------------ |
| bitmap | [ImageData](ts-components-canvas-imagebitmap.md) | 待显示的ImageBitmap对象。 |
| bitmap | [ImageBitmap](ts-components-canvas-imagebitmap.md) | 待显示的ImageBitmap对象。 |
**示例：**
......@@ -2230,7 +2314,7 @@ transferFromImageBitmap(bitmap: ImageBitmap): void
// xxx.ets
@Entry
@Component
struct PutImageData {
struct TransferFromImageBitmap {
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
......@@ -2259,7 +2343,8 @@ transferFromImageBitmap(bitmap: ImageBitmap): void
}
}
```
![zh-cn_image_000000127777773](figures/zh-cn_image_000000127777773.png)
![zh-cn_image_0000001238952387](figures/zh-cn_image_0000001238952387.png)
### toDataURL
......@@ -2330,7 +2415,11 @@ restore(): void
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.context.restore()
this.context.save(); // save the default state
this.context.fillStyle = "green";
this.context.fillRect(20, 20, 100, 100);
this.context.restore(); // restore to the default state
this.context.fillRect(150, 75, 100, 100);
})
}
.width('100%')
......@@ -2338,6 +2427,7 @@ restore(): void
}
}
```
![zh-cn_image_000000127777781](figures/zh-cn_image_000000127777781.png)
### save
......@@ -2363,7 +2453,11 @@ save(): void
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.context.save()
this.context.save(); // save the default state
this.context.fillStyle = "green";
this.context.fillRect(20, 20, 100, 100);
this.context.restore(); // restore to the default state
this.context.fillRect(150, 75, 100, 100);
})
}
.width('100%')
......@@ -2371,6 +2465,7 @@ save(): void
}
}
```
![zh-cn_image_000000127777781](figures/zh-cn_image_000000127777781.png)
### createLinearGradient
......
zh-cn/application-dev/reference/arkui-ts/ts-components-canvas-canvas.md
浏览文件 @ 0fa2c5c5
# Canvas
> **说明：** 该组件从API Version 8开始支持。后续版本如有新增内容，则采用上角标单独标记该内容的起始版本。
提供画布组件，用于自定义绘制图形。
> **说明：**
>
> 该组件从API Version 8开始支持。后续版本如有新增内容，则采用上角标单独标记该内容的起始版本。
## 权限列表
无
......@@ -34,7 +38,8 @@ Canvas(context?: CanvasRenderingContext2D)
| ----------------------------- | ---- | -------------------- |
| onReady(event: () => void) | 无 | Canvas组件初始化完成时的事件回调，该事件之后Canvas组件宽高确定且可获取，可使用Canvas相关API进行绘制。 |
## 示例
**示例：**
```ts
// xxx.ets
......@@ -59,3 +64,4 @@ struct CanvasExample {
}
}
```
![zh-cn_image_0000001194032666](figures/zh-cn_image_0000001194032666.png)
\ No newline at end of file
zh-cn/application-dev/reference/arkui-ts/ts-components-canvas-canvasgradient.md
浏览文件 @ 0fa2c5c5
# CanvasGradient对象
渐变对象。
> **说明：**
>
> 从 API Version 8 开始支持。后续版本如有新增内容，则采用上角标单独标记该内容的起始版本。
渐变对象。
## addColorStop
......@@ -13,13 +14,16 @@ addColorStop(offset: number, color: string): void
设置渐变断点值，包括偏移和颜色。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 默认值 | 描述 |
| ------ | ------ | ---- | --------- | ---------------------------- |
| offset | number | 是 | 0 | 设置渐变点距离起点的位置占总体长度的比例，范围为0到1。 |
| color | string | 是 | '#ffffff' | 设置渐变的颜色。 |
- 示例
**示例：**
```ts
// xxx.ets
......@@ -48,10 +52,6 @@ addColorStop(offset: number, color: string): void
.height('100%')
}}
```
![zh-cn_image_0000001194032516](figures/zh-cn_image_0000001194032516.png)
\ No newline at end of file
zh-cn/application-dev/reference/arkui-ts/ts-components-canvas-imagebitmap.md
浏览文件 @ 0fa2c5c5
# ImageBitmap对象
ImageBitmap对象可以存储canvas渲染的像素数据。
> **说明：**
>
> 从 API Version 8 开始支持。后续版本如有新增内容，则采用上角标单独标记该内容的起始版本。
ImageBitmap对象可以存储canvas渲染的像素数据。
## 属性
......@@ -14,6 +15,36 @@ ImageBitmap对象可以存储canvas渲染的像素数据。
| width | number | ImageBitmap的像素宽度。 |
| height | number | ImageBitmap的像素高度。 |
**示例：**
```ts
// xxx.ets
@Entry
@Component
struct ImageExample {
private settings: RenderingContextSettings = new RenderingContextSettings(true);
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings);
private img:ImageBitmap = new ImageBitmap("common/images/example.jpg");
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
.width('100%')
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.context.drawImage( this.img,0,0,500,500,0,0,400,200);
})
}
.width('100%')
.height('100%')
}
}
```
![zh-cn_image_0000001194352442](figures/zh-cn_image_0000001194352442.png)
## 方法
......
zh-cn/application-dev/reference/arkui-ts/ts-components-canvas-imagedata.md
浏览文件 @ 0fa2c5c5
# ImageData对象
ImageData对象可以存储canvas渲染的像素数据。
> **说明：**
>
> 从 API Version 8 开始支持。后续版本如有新增内容，则采用上角标单独标记该内容的起始版本。
ImageData对象可以存储canvas渲染的像素数据。
## 属性
......@@ -15,3 +16,34 @@ ImageData对象可以存储canvas渲染的像素数据。
| height | number | 矩形区域实际像素高度。 |
| data | Uint8ClampedArray | 一维数组，保存了相应的颜色数据，数据值范围为0到255。 |
**示例：**
```ts
// xxx.ets
@Entry
@Component
struct Translate {
private settings: RenderingContextSettings = new RenderingContextSettings(true);
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings);
private img:ImageBitmap = new ImageBitmap("/common/images/1234.png")
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
.width('100%')
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.context.drawImage(this.img,0,0,130,130);
var imagedata = this.context.getImageData(50,50,130,130);
this.context.putImageData(imagedata,150,150);
})
}
.width('100%')
.height('100%')
}
}
```
![zh-cn_image_000000127777780](figures/zh-cn_image_000000127777780.png)
zh-cn/application-dev/reference/arkui-ts/ts-components-canvas-lottie.md
浏览文件 @ 0fa2c5c5
......@@ -3,13 +3,10 @@
提供Lottie动画。
> **说明：**
>
> 从 API Version 8 开始支持。后续版本如有新增内容，则采用上角标单独标记该内容的起始版本。
## 权限列表
无
## 导入模块
......@@ -32,7 +29,8 @@ path: string, container: object, render: string, loop: boolean, autoplay: boolea
加载动画，须提前声明Animator('__lottie_ets')对象，并在Canvas完成布局后调用。可配合Canvas组件生命周期接口使用，比如onAppear()与onPageShow()。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| -------------- | --------------------------- | ---- | ---------------------------------------- |
| path | string | 是 | hap包内动画资源文件路径，仅支持json格式。示例：path:&nbsp;"common/lottie/data.json" |
......@@ -50,12 +48,13 @@ destroy(name: string): void
销毁动画，页面退出时，必须调用。可配合Canvas组件生命周期接口使用，比如onDisappear()与onPageHide()。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ---- | ------ | ---- | ---------------------------------------- |
| name | string | 是 | 被指定的动画名，同loadAnimation接口参数name,&nbsp;缺省时销毁所有动画。 |
- 示例
**示例：**
```ts
// xxx.ets
import lottie from '@ohos/lottieETS'
......@@ -130,12 +129,14 @@ play(name: string): void
播放指定动画。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ---- | ------ | ---- | ---------------------------------------- |
| name | string | 是 | 被指定的动画名,&nbsp;同loadAnimation接口参数name，缺省时播放所有动画。 |
- 示例
**示例：**
```ts
lottie.play(this.animateName)
```
......@@ -147,12 +148,14 @@ pause(name: string): void
暂停指定动画，下次调用lottie.play()从当前帧开始。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ---- | ------ | ---- | ---------------------------------------- |
| name | string | 是 | 被指定的动画名，同loadAnimation接口入参name，缺省时暂停所有动画。 |
- 示例
**示例：**
```ts
lottie.pause(this.animateName)
```
......@@ -164,12 +167,14 @@ togglePause(name: string): void
暂停或播放指定动画，等效于lottie.play()与lottie.pause()切换调用。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ---- | ------ | ---- | ---------------------------------------- |
| name | string | 是 | 被指定的动画名，同loadAnimation接口参数name，缺省时停止所有动画。 |
- 示例
**示例：**
```ts
lottie.togglePause(this.animateName)
```
......@@ -181,12 +186,14 @@ stop(name: string): void
停止指定动画，下次调用lottie.play()从第一帧开始。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ---- | ------ | ---- | ---------------------------------------- |
| name | string | 是 | 被指定的动画名，同loadAnimation接口参数name，缺省时停止所有动画。 |
- 示例
**示例：**
```ts
lottie.stop(this.animateName)
```
......@@ -198,13 +205,15 @@ setSpeed(speed: number, name: string): void
设置指定动画播放速度。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ----- | ------ | ---- | ---------------------------------------- |
| speed | number | 是 | 值为浮点类型,&nbsp;speed&gt;0正向播放,&nbsp;speed&lt;0反向播放,&nbsp;speed=0暂停播放,&nbsp;speed=1.0/-1.0正常速度播放。 |
| name | string | 是 | 被指定的动画，同loadAnimation接口参数name，缺省时停止所有动画。 |
- 示例
**示例：**
```ts
lottie.setSpeed(5, this.animateName)
```
......@@ -216,13 +225,15 @@ setDirection(direction: AnimationDirection, name: string): void
设置指定动画播放顺序。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| --------- | ------------------ | ---- | ---------------------------------------- |
| direction | AnimationDirection | 是 | 1为正向，-1为反向;&nbsp;当设置为反向时，从当前播放进度开始回播直到首帧，loop值为true时可无限倒放；speed&lt;0叠加时也是倒放。<br/>AnimationDirection：1&nbsp;\|&nbsp;-1 |
| name | string | 是 | 被指定的动画名，同loadAnimation接口参数name，缺省时设置所有动画方向。 |
- 示例
**示例：**
```ts
lottie.setDirection(-1, this.animateName)
```
......@@ -262,12 +273,14 @@ play(name?: string): void
播放动画。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ---- | ------ | ---- | --------------- |
| name | string | 否 | 被指定的动画名，缺省默认为空。 |
- 示例
**示例：**
```ts
this.animateItem.play()
```
......@@ -279,12 +292,14 @@ destroy(name?: string): void
销毁动画。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ---- | ------ | ---- | --------------- |
| name | string | 否 | 被指定的动画名，缺省默认为空。 |
- 示例
**示例：**
```ts
this.animateItem.destroy()
```
......@@ -296,12 +311,14 @@ pause(name?: string): void
暂停动画，下次调用play接口从当前帧开始播放。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ---- | ------ | ---- | --------------- |
| name | string | 否 | 被指定的动画名，缺省默认为空。 |
- 示例
**示例：**
```ts
this.animateItem.pause()
```
......@@ -313,12 +330,14 @@ togglePause(name?: string): void
暂停或播放动画，等效于play接口与pause接口之间轮换调用。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ---- | ------ | ---- | --------------- |
| name | string | 否 | 被指定的动画名，缺省默认为空。 |
- 示例
**示例：**
```ts
this.animateItem.togglePause()
```
......@@ -330,12 +349,14 @@ stop(name?: string): void
停止动画，下次调用play接口从第一帧开始播放。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ---- | ------ | ---- | --------------- |
| name | string | 否 | 被指定的动画名，缺省默认为空。 |
- 示例
**示例：**
```ts
this.animateItem.stop()
```
......@@ -347,12 +368,14 @@ setSpeed(speed: number): void
设置动画播放速度。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ----- | ------ | ---- | ---------------------------------------- |
| speed | number | 是 | 值为浮点类型,&nbsp;speed&gt;0正向播放,&nbsp;speed&lt;0反向播放,&nbsp;speed=0暂停播放,&nbsp;speed=1.0&nbsp;\|&nbsp;-1.0正常速度播放。 |
- 示例
**示例：**
```ts
this.animateItem.setSpeed(5);
```
......@@ -364,12 +387,14 @@ setDirection(direction: AnimationDirection): void
设置动画播放顺序。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| --------- | ------------------ | ---- | ---------------------------------------- |
| direction | AnimationDirection | 是 | 1为正向，-1为反向;&nbsp;当设置为反向时，从当前播放进度开始回播直到首帧，loop值为true时可无限倒放；speed&lt;0叠加时也是倒放。<br/>AnimationDirection：1&nbsp;\|&nbsp;-1。 |
- 示例
**示例：**
```ts
this.animateItem.setDirection(-1)
```
......@@ -381,14 +406,16 @@ goToAndStop(value: number, isFrame?: boolean): void
设置动画停止在指定帧或时间进度。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ------- | ------- | ---- | ---------------------------------------- |
| value | number | 是 | 帧号(值大于等于0)或时间进度(ms)。 |
| isFrame | boolean | 否 | true:&nbsp;按指定帧控制，false:按指定时间控制，缺省默认false。 |
| name | string | 否 | 被指定的动画名，缺省默认为空。 |
- 示例
**示例：**
```ts
// 按帧号控制
this.animateItem.goToAndStop(25, true)
......@@ -403,14 +430,16 @@ goToAndPlay(value: number, isFrame: boolean, name?: string): void
设置动画从指定帧或时间进度开始播放。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ------- | ------- | ---- | ---------------------------------------- |
| value | number | 是 | 帧号(值大于等于0)或时间进度(ms) |
| isFrame | boolean | 是 | true：按指定帧控制，&nbsp;false：按指定时间控制，缺省默认false。 |
| name | string | 否 | 被指定的动画名，缺省默认为空。 |
- 示例
**示例：**
```ts
// 按帧号控制
this.animateItem.goToAndPlay(25, true)
......@@ -425,13 +454,15 @@ playSegments(segments: AnimationSegment | AnimationSegment[], forceFlag: boolean
设置动画仅播放指定片段。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| --------- | ---------------------------------------- | ---- | ---------------------------------------- |
| segments | AnimationSegment&nbsp;=&nbsp;[number,&nbsp;number]&nbsp;\|&nbsp;AnimationSegment[] | 是 | 片段或片段列表；<br/>如果片段列表全部播放完毕后，下轮循环播放仅播放最后一个片段 |
| forceFlag | boolean | 是 | true：即时生效播放，false：延迟到下轮循环播放再生效 |
- 示例
**示例：**
```ts
// 指定播放片段
this.animateItem.playSegments([10, 20], false)
......@@ -446,12 +477,14 @@ resetSegments(forceFlag: boolean): void
重置动画播放片段，播放全帧。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| --------- | ------- | ---- | ------------------------------ |
| forceFlag | boolean | 是 | true：即时生效播放，false：延迟到下轮循环播放再生效 |
- 示例
**示例：**
```ts
this.animateItem.resetSegments(true)
```
......@@ -463,7 +496,8 @@ resize(): void
刷新动画布局。
- 示例
**示例：**
```ts
this.animateItem.resize()
```
......@@ -475,12 +509,14 @@ setSubframe(useSubFrame: boolean): void
设置属性currentFrame的精度显示浮点数。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ------------ | ------- | ---- | ---------------------------------------- |
| useSubFrames | boolean | 是 | currentFrame属性默认显示浮点数，该接口参数将影响currentFrame属性的精度。<br/>true：属性currentFrame显示浮点。<br/>false：属性currentFrame去浮点数显示整数。 |
- 示例
**示例：**
```ts
this.animateItem.setSubframe(false)
```
......@@ -492,12 +528,14 @@ getDuration(inFrames?: boolean): void
获取动画单次完整播放的时间(与播放速度无关)或帧数, 与Lottie.loadAnimation接口入参initialSegment有关。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| -------- | ------- | ---- | ---------------------------------------- |
| inFrames | boolean | 否 | true：获取帧数，&nbsp;false：获取时间(单位ms)，缺省默认false。 |
- 示例
**示例：**
```ts
this.animateItem.getDuration(true)
```
......@@ -509,13 +547,15 @@ addEventListener&lt;T = any&gt;(name: AnimationEventName, callback: AnimationEve
添加侦听事件, 事件完成后会触发指定回调函数。返回可删除该侦听事件的函数对象。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| -------- | ------------------------------- | ---- | ---------------------------------------- |
| name | AnimationEventName | 是 | 指定动画事件类型，Lottie内置动画事件类型AnimationEventName：<br/>'enterFrame'、'loopComplete'、'complete'、'segmentStart'、'destroy'、'config_ready'、'data_ready'、'DOMLoaded'、'error'、'data_failed'、'loaded_images' |
| callback | AnimationEventCallback&lt;T&gt; | 是 | 用户自定义回调函数 |
- 示例
**示例：**
```ts
private callbackItem: any = function() {
console.log("grunt loopComplete")
......@@ -533,13 +573,15 @@ removeEventListener&lt;T = any&gt;(name: AnimationEventName, callback?: Animatio
删除侦听事件。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| -------- | ------------------------------- | ---- | ---------------------------------------- |
| name | AnimationEventName | 是 | 指定动画事件类型，Lottie内置动画事件类型AnimationEventName：<br/>'enterFrame'、'loopComplete'、'complete'、'segmentStart'、'destroy'、'config_ready'、'data_ready'、'DOMLoaded'、'error'、'data_failed'、'loaded_images' |
| callback | AnimationEventCallback&lt;T&gt; | 否 | 用户自定义回调函数；缺省为空时，删除此事件的所有回调函数。 |
- 示例
**示例：**
```ts
this.animateItem.removeEventListener('loopComplete', this.animateName)
```
......@@ -551,13 +593,15 @@ triggerEvent&lt;T = any&gt;(name: AnimationEventName, args: T): void
直接触发指定事件的所有已设置的回调函数。
- 参数
**参数：**
| 参数 | 类型 | 必填 | 描述 |
| ---- | ------------------ | ---- | --------- |
| name | AnimationEventName | 是 | 指定动画事件类型 |
| args | any | 是 | 用户自定义回调参数 |
- 示例
**示例：**
```ts
private triggerCallBack: any = function(item) {
console.log("trigger loopComplete, name:" + item.name)
......
zh-cn/application-dev/reference/arkui-ts/ts-components-canvas-path2d.md
浏览文件 @ 0fa2c5c5
# Path2D对象
路径对象，支持通过对象的接口进行路径的描述，并通过Canvas的stroke接口进行绘制。
> **说明：**
>
> 从 API Version 8 开始支持。后续版本如有新增内容，则采用上角标单独标记该内容的起始版本。
路径对象，支持通过对象的接口进行路径的描述，并通过Canvas的stroke接口进行绘制。
## addPath
......@@ -225,7 +226,8 @@ bezierCurveTo(cp1x: number, cp1y: number, cp2x: number, cp2y: number, x: number,
.backgroundColor('#ffff00')
.onReady(() =>{
this.path2Db.moveTo(10, 10)
this.path2Db.bezierCurveTo(20, 100, 200, 100, 200, 20);this.context.stroke(this.path2Db)
this.path2Db.bezierCurveTo(20, 100, 200, 100, 200, 20)
this.context.stroke(this.path2Db)
})
}
.width('100%')
......@@ -319,7 +321,8 @@ arc(x: number, y: number, radius: number, startAngle: number, endAngle: number,
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.path2Db.arc(100, 75, 50, 0, 6.28);this.context.stroke(this.path2Db)
this.path2Db.arc(100, 75, 50, 0, 6.28)
this.context.stroke(this.path2Db)
})
}
.width('100%')
......@@ -415,7 +418,7 @@ ellipse(x: number, y: number, radiusX: number, radiusY: number, rotation: number
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.path2Db.ellipse(200, 200, 50, 100, Math.PI * 0.25, Math.PI * 0.5, Math.PI)
this.path2Db.ellipse(200, 200, 50, 100, 0, Math.PI * 1, Math.PI*2)
this.context.stroke(this.path2Db)
})
}
......@@ -461,7 +464,8 @@ rect(x: number, y: number, w: number, h: number): void
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.path2Db.rect(20, 20, 100, 100);this.context.stroke(this.path2Db)
this.path2Db.rect(20, 20, 100, 100);
this.context.stroke(this.path2Db)
})
}
.width('100%')
......
zh-cn/application-dev/reference/arkui-ts/ts-offscreencanvasrenderingcontext2d.md
浏览文件 @ 0fa2c5c5
# OffscreenCanvasRenderingContext2D对象
使用OffscreenCanvasRenderingContext2D在Canvas上进行离屏绘制，绘制对象可以是矩形、文本、图片等。离屏绘制是指将需要绘制的内容先绘制在缓存区，然后将其转换成图片，一次性绘制到canvas上，加快了绘制速度。
> **说明：**
>
> 从 API Version 8 开始支持。后续版本如有新增内容，则采用上角标单独标记该内容的起始版本。
使用OffscreenCanvasRenderingContext2D在Canvas上进行离屏绘制，绘制对象可以是矩形、文本、图片等。离屏绘制是指将需要绘制的内容先绘制在缓存区，然后将其转换成图片，一次性绘制到canvas上，加快了绘制速度。
## 接口
......@@ -41,7 +42,6 @@ OffscreenCanvasRenderingContext2D(width: number, height: number, setting: Render
| [shadowOffsetX](#shadowoffsetx) | number | 设置绘制阴影时和原有对象的水平偏移值。 |
| [shadowOffsetY](#shadowoffsety) | number | 设置绘制阴影时和原有对象的垂直偏移值。 |
| [imageSmoothingEnabled](#imagesmoothingenabled) | boolean | 用于设置绘制图片时是否进行图像平滑度调整，true为启用，false为不启用。 <br/>-&nbsp;默认值：true。 |
| imageSmoothingQuality | string | 用于设置图像平滑度，支持如下三种类型：'low',&nbsp;'medium',&nbsp;'high'。<br/>-&nbsp;默认值：'low'。 |
> ![icon-note.gif](public_sys-resources/icon-note.gif) **说明：**
> fillStyle、shadowColor与 strokeStyle 中string类型格式为 'rgb(255, 255, 255)'，'rgba(255, 255, 255, 1.0)'，'\#FFFFFF'。
......@@ -572,8 +572,7 @@ struct ShadowColor {
this.offContext.shadowColor = 'rgb(0,0,255)'
this.offContext.fillStyle = 'rgb(255,0,0)'
this.offContext.fillRect(30, 30, 100, 100)
var image = this.offContext.transferToImageBitmap
()
var image = this.offContext.transferToImageBitmap()
this.context.transferFromImageBitmap(image)
})
}
......@@ -739,7 +738,7 @@ fillRect(x: number, y: number, w: number, h: number): void
}
```
![zh-cn_image_0000001238832407](figures/zh-cn_image_0000001238832407.png)
![zh-cn_image_0000001194192436](figures/zh-cn_image_0000001194192436.png)
### strokeRect
......@@ -767,6 +766,7 @@ strokeRect(x: number, y: number, w: number, h: number): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -785,7 +785,7 @@ strokeRect(x: number, y: number, w: number, h: number): void
}
```
![zh-cn_image_0000001238712441](figures/zh-cn_image_0000001238712441.png)
![zh-cn_image_0000001194352436](figures/zh-cn_image_0000001194352436.png)
### clearRect
......@@ -813,6 +813,7 @@ clearRect(x: number, y: number, w: number, h: number): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -821,8 +822,8 @@ clearRect(x: number, y: number, w: number, h: number): void
.backgroundColor('#ffff00')
.onReady(() =>{
this.offContext.fillStyle = 'rgb(0,0,255)'
this.offContext.fillRect(0,0,500,500)
this.offContext.clearRect(20,20,150,100)
this.offContext.fillRect(20,20,200,200)
this.offContext.clearRect(30,30,150,100)
var image = this.offContext.transferToImageBitmap()
this.context.transferFromImageBitmap(image)
})
......@@ -833,7 +834,7 @@ clearRect(x: number, y: number, w: number, h: number): void
}
```
![zh-cn_image_0000001194192458](figures/zh-cn_image_0000001194192458.png)
![zh-cn_image_0000001238952377](figures/zh-cn_image_0000001238952377.png)
### fillText
......@@ -861,6 +862,7 @@ fillText(text: string, x: number, y: number, maxWidth?: number): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -880,7 +882,7 @@ fillText(text: string, x: number, y: number, maxWidth?: number): void
}
```
![zh-cn_image_0000001194352454](figures/zh-cn_image_0000001194352454.png)
![zh-cn_image_0000001194032458](figures/zh-cn_image_0000001194032458.png)
### strokeText
......@@ -908,6 +910,7 @@ strokeText(text: string, x: number, y: number): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -976,6 +979,7 @@ measureText(text: string): TextMetrics
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1021,6 +1025,7 @@ stroke(path?: Path2D): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1030,6 +1035,8 @@ stroke(path?: Path2D): void
.onReady(() =>{
this.offContext.moveTo(25, 25)
this.offContext.lineTo(25, 105)
this.offContext.lineTo(75, 105)
this.offContext.lineTo(75, 25)
this.offContext.strokeStyle = 'rgb(0,0,255)'
this.offContext.stroke()
var image = this.offContext.transferToImageBitmap()
......@@ -1042,7 +1049,7 @@ stroke(path?: Path2D): void
}
```
![zh-cn_image_0000001239032427](figures/zh-cn_image_0000001239032427.png)
![zh-cn_image_0000001238832389](figures/zh-cn_image_0000001238832389.png)
### beginPath
......@@ -1061,6 +1068,7 @@ beginPath(): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1110,6 +1118,7 @@ moveTo(x: number, y: number): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1157,6 +1166,7 @@ lineTo(x: number, y: number): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1197,6 +1207,7 @@ closePath(): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1253,6 +1264,7 @@ createPattern(image: ImageBitmap, repetition: string | null): CanvasPattern | nu
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private img:ImageBitmap = new ImageBitmap("common/images/icon.jpg")
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1303,6 +1315,7 @@ bezierCurveTo(cp1x: number, cp1y: number, cp2x: number, cp2y: number, x: number,
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1352,6 +1365,7 @@ quadraticCurveTo(cpx: number, cpy: number, x: number, y: number): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1403,6 +1417,7 @@ arc(x: number, y: number, radius: number, startAngle: number, endAngle: number,
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1452,6 +1467,7 @@ arcTo(x1: number, y1: number, x2: number, y2: number, radius: number): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1512,7 +1528,7 @@ ellipse(x: number, y: number, radiusX: number, radiusY: number, rotation: number
.backgroundColor('#ffff00')
.onReady(() =>{
this.offContext.beginPath()
this.offContext.ellipse(200, 200, 50, 100, Math.PI * 0.25, Math.PI * 0.5, Math.PI)
this.offContext.ellipse(200, 200, 50, 100, Math.PI * 0.25, Math.PI * 0.5, Math.PI * 2)
this.offContext.stroke()
var image = this.offContext.transferToImageBitmap()
this.context.transferFromImageBitmap(image)
......@@ -1524,7 +1540,7 @@ ellipse(x: number, y: number, radiusX: number, radiusY: number, rotation: number
}
```
![zh-cn_image_0000001238832411](figures/zh-cn_image_0000001238832411.png)
![zh-cn_image_0000001194192440](figures/zh-cn_image_0000001194192440.png)
### rect
......@@ -1552,6 +1568,7 @@ rect(x: number, y: number, w: number, h: number): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1576,11 +1593,15 @@ rect(x: number, y: number, w: number, h: number): void
### fill
fill(): void
fill(fillRule?: CanvasFillRule): void
对封闭路径进行填充。
**示例：**
**参数:**
| 参数 | 类型 | 必填 | 默认值 | 描述 |
| -------- | -------------- | ---- | --------- | ---------------------------------------- |
| fillRule | CanvasFillRule | 否 | "nonzero" | 指定要填充对象的规则。<br/>可选参数为："nonzero", "evenodd"。 |
```ts
// xxx.ets
......@@ -1590,6 +1611,7 @@ fill(): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1612,12 +1634,73 @@ fill(): void
![zh-cn_image_0000001194192462](figures/zh-cn_image_0000001194192462.png)
fill(path: Path2D, fillRule?: CanvasFillRule): void
对封闭路径进行填充。
**参数:**
| 参数 | 类型 | 必填 | 默认值 | 描述 |
| -------- | -------------- | ---- | --------- | ---------------------------------------- |
| path | Path2D | 是 | | Path2D填充路径。 |
| fillRule | CanvasFillRule | 否 | "nonzero" | 指定要填充对象的规则。<br/>可选参数为："nonzero", "evenodd"。 |
**示例:**
```ts
// xxx.ets
@Entry
@Component
struct Fill {
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
.width('100%')
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
let region = new Path2D();
region.moveTo(30, 90);
region.lineTo(110, 20);
region.lineTo(240, 130);
region.lineTo(60, 130);
region.lineTo(190, 20);
region.lineTo(270, 90);
region.closePath();
// Fill path
this.offContext.fillStyle = 'green';
this.offContext.fill(region, "evenodd");
var image = this.offContext.transferToImageBitmap()
this.context.transferFromImageBitmap(image)
})
}
.width('100%')
.height('100%')
}
}
```
![zh-cn_image_000000127777775](figures/zh-cn_image_000000127777775.png)
### clip
clip(): void
clip(fillRule?: CanvasFillRule): void
设置当前路径为剪切路径。
**参数:**
| 参数 | 类型 | 必填 | 默认值 | 描述 |
| -------- | -------------- | ---- | --------- | ---------------------------------------- |
| fillRule | CanvasFillRule | 否 | "nonzero" | 指定要剪切对象的规则。<br/>可选参数为："nonzero", "evenodd"。 |
**示例：**
```ts
......@@ -1628,6 +1711,7 @@ clip(): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1635,11 +1719,11 @@ clip(): void
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.offContext.rect(0, 0, 200, 200)
this.offContext.rect(0, 0, 100, 200)
this.offContext.stroke()
this.offContext.clip()
this.offContext.fillStyle = "rgb(255,0,0)"
this.offContext.fillRect(0, 0, 150, 150)
this.offContext.fillRect(0, 0, 200, 200)
var image = this.offContext.transferToImageBitmap()
this.context.transferFromImageBitmap(image)
})
......@@ -1650,7 +1734,90 @@ clip(): void
}
```
![zh-cn_image_0000001194352458](figures/zh-cn_image_0000001194352458.png)
![zh-cn_image_0000001194032462](figures/zh-cn_image_0000001194032462.png)
clip(path:Path2D, fillRule?: CanvasFillRule): void
设置封闭路径为剪切路径。
**参数:**
| 参数 | 类型 | 必填 | 默认值 | 描述 |
| -------- | -------------- | ---- | --------- | ---------------------------------------- |
| path | Path2D | 是 | | Path2D剪切路径。 |
| fillRule | CanvasFillRule | 否 | "nonzero" | 指定要剪切对象的规则。<br/>可选参数为："nonzero", "evenodd"。 |
**示例：**
```ts
// xxx.ets
@Entry
@Component
struct Clip {
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
.width('100%')
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
let region = new Path2D();
region.rect(80,10,20,130);
region.rect(40,50,100,50);
this.offContext.clip(region,"evenodd")
this.offContext.fillStyle = "rgb(255,0,0)"
this.offContext.fillRect(0, 0, 600, 600)
var image = this.offContext.transferToImageBitmap()
this.context.transferFromImageBitmap(image)
})
}
.width('100%')
.height('100%')
}
}
```
![zh-cn_image_000000127777779](figures/zh-cn_image_000000127777779.png)
### filter
filter(filter: string): void
为Canvas图形设置各类滤镜效果。该接口为空接口。
**参数:**
| 参数 | 类型 | 必填 | 默认值 | 说明 |
| ------ | ------ | ---- | ---- | ------------ |
| filter | string | 是 | - | 接受各类滤镜效果的函数。 |
### getTransform
getTransform(): Matrix2D
获取当前被应用到上下文的转换矩阵。该接口为空接口。
### resetTransform
resetTransform(): void
使用单位矩阵重新设置当前变形。该接口为空接口。
### direction
direction(direction: CanvasDirection): void
绘制文本时，描述当前文本方向的属性。该接口为空接口。
### rotate
......@@ -1675,6 +1842,7 @@ rotate(angle: number): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1720,6 +1888,7 @@ scale(x: number, y: number): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1727,9 +1896,10 @@ scale(x: number, y: number): void
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.offContext.strokeRect(10, 10, 25, 25)
this.offContext.lineWidth = 3
this.offContext.strokeRect(30, 30, 50, 50)
this.offContext.scale(2, 2) // Scale to 200%
this.offContext.strokeRect(10, 10, 25, 25)
this.offContext.strokeRect(30, 30, 50, 50)
var image = this.offContext.transferToImageBitmap()
this.context.transferFromImageBitmap(image)
})
......@@ -1740,7 +1910,7 @@ scale(x: number, y: number): void
}
```
![zh-cn_image_0000001194032484](figures/zh-cn_image_0000001194032484.png)
![zh-cn_image_0000001193872498](figures/zh-cn_image_0000001193872498.png)
### transform
......@@ -1777,6 +1947,7 @@ transform方法对应一个变换矩阵，想对一个图形进行变化的时
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1832,6 +2003,7 @@ setTransform方法使用的参数和transform()方法相同，但setTransform()
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1880,6 +2052,7 @@ translate(x: number, y: number): void
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -1934,7 +2107,7 @@ drawImage(image: ImageBitmap | PixelMap, sx: number, sy: number, sw: number, sh:
// xxx.ets
@Entry
@Component
struct Index {
struct DrawImage {
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private img:ImageBitmap = new ImageBitmap("common/images/icon.jpg")
......@@ -1964,7 +2137,7 @@ drawImage(image: ImageBitmap | PixelMap, sx: number, sy: number, sw: number, sh:
createImageData(sw: number, sh: number): ImageData
根据宽高创建ImageData对象，请参考[ImageData](ts-components-canvas-imagebitmap.md)。
根据宽高创建ImageData对象，请参考[ImageData](ts-components-canvas-imagedata.md)。
**参数：**
......@@ -1974,23 +2147,21 @@ createImageData(sw: number, sh: number): ImageData
| sh | number | 是 | 0 | ImageData的高度。 |
### createImageData
createImageData(imageData: ImageData): ImageData
根据已创建的ImageData对象创建新的ImageData对象，请参考[ImageData](ts-components-canvas-imagebitmap.md)。
根据已创建的ImageData对象创建新的ImageData对象，请参考[ImageData](ts-components-canvas-imagedata.md)。
**参数：**
| 参数 | 类型 | 必填 | 默认 | 描述 |
| --------- | ---------------------------------------- | ---- | ---- | ---------------- |
| imagedata | [ImageData](ts-components-canvas-imagebitmap.md) | 是 | null | 被复制的ImageData对象。 |
| imagedata | [ImageData](ts-components-canvas-imagedata.md) | 是 | null | 被复制的ImageData对象。 |
**返回值：**
| 类型 | 说明 |
| ---------------------------------------- | ------------- |
| [ImageData](ts-components-canvas-imagebitmap.md) | 新的ImageData对象 |
| [ImageData](ts-components-canvas-imagedata.md) | 新的ImageData对象 |
### getPixelMap
......@@ -2018,7 +2189,7 @@ getPixelMap(sx: number, sy: number, sw: number, sh: number): PixelMap
getImageData(sx: number, sy: number, sw: number, sh: number): ImageData
以当前canvas指定区域内的像素创建[ImageData](ts-components-canvas-imagebitmap.md)对象。
以当前canvas指定区域内的像素创建[ImageData](ts-components-canvas-imagedata.md)对象。
**参数：**
......@@ -2033,7 +2204,42 @@ getImageData(sx: number, sy: number, sw: number, sh: number): ImageData
| 类型 | 说明 |
| ---------------------------------------- | ------------- |
| [ImageData](ts-components-canvas-imagebitmap.md) | 新的ImageData对象 |
| [ImageData](ts-components-canvas-imagedata.md) | 新的ImageData对象 |
**示例：**
```ts
// xxx.ets
@Entry
@Component
struct GetImageData {
private settings: RenderingContextSettings = new RenderingContextSettings(true);
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings);
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
private img:ImageBitmap = new ImageBitmap("/common/images/1234.png")
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
.width('100%')
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.offContext.drawImage(this.img,0,0,130,130);
var imagedata = this.offContext.getImageData(50,50,130,130);
this.offContext.putImageData(imagedata,150,150);
var image = this.offContext.transferToImageBitmap()
this.context.transferFromImageBitmap(image)
})
}
.width('100%')
.height('100%')
}
}
```
![zh-cn_image_000000127777780](figures/zh-cn_image_000000127777780.png)
### putImageData
......@@ -2042,7 +2248,7 @@ putImageData(imageData: Object, dx: number, dy: number): void
putImageData(imageData: Object, dx: number, dy: number, dirtyX: number, dirtyY: number, dirtyWidth?: number, dirtyHeight: number): void
使用[ImageData](ts-components-canvas-imagebitmap.md)数据填充新的矩形区域。
使用[ImageData](ts-components-canvas-imagedata.md)数据填充新的矩形区域。
**参数：**
......@@ -2153,21 +2359,29 @@ getLineDash(): number[]
```ts
// xxx.ets
@Entry
@Component
struct GetLineDash {
@Entry
@Component
struct OffscreenCanvasGetLineDash {
@State message: string = 'Hello World'
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Row() {
Column() {
Text(this.message)
.fontSize(50)
.fontWeight(FontWeight.Bold)
.onClick(()=>{
console.error('before getlinedash clicked')
let res = this.offContext.getLineDash()
console.error(JSON.stringify(res))
})
Canvas(this.context)
.width('100%')
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
var grad = this.context.createLinearGradient(50,0, 300,100)
.onReady(() => {
this.offContext.arc(100, 75, 50, 0, 6.28)
this.offContext.setLineDash([10,20])
this.offContext.stroke();
......@@ -2177,53 +2391,14 @@ getLineDash(): number[]
})
}
.width('100%')
.height('100%')
}
.height('100%')
}
}
```
![zh-cn_image_000000127777778](figures/zh-cn_image_000000127777778.png)
### transferFromImageBitmap
transferFromImageBitmap(bitmap: ImageBitmap): void
显示给定的ImageBitmap对象。
**参数：**
| 参数 | 类型 | 描述 |
| ------ | ---------------------------------------- | ------------------ |
| bitmap | [ImageData](ts-components-canvas-imagebitmap.md) | 待显示的ImageBitmap对象。 |
**示例：**
```ts
// xxx.ets
@Entry
@Component
struct GetLineDash {
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
.width('100%')
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.offContext.fillRect(0, 0, 200, 200)
var image = this.offContext.transferToImageBitmap()
this.context.transferFromImageBitmap(image)
})
}
.width('100%')
.height('100%')
}
}
```
![zh-cn_image_000000127777773](figures/zh-cn_image_000000127777773.png)
### toDataURL
......@@ -2247,7 +2422,7 @@ toDataURL(type?: string, quality?: number): string
**示例：**
```ts
// xxx.ets
// xxx.ets
@Entry
@Component
struct ToDataURL {
......@@ -2272,6 +2447,19 @@ struct ToDataURL {
```
### imageSmoothingQuality
imageSmoothingQuality(quality: imageSmoothingQuality)
用于设置图像平滑度。该接口为空接口。
**参数：**
| 参数 | 类型 | 描述 |
| ------- | --------------------- | ---------------------------------------- |
| quality | imageSmoothingQuality | 支持如下三种类型：'low',&nbsp;'medium',&nbsp;'high'。 |
### transferToImageBitmap
transferToImageBitmap(): ImageBitmap
......@@ -2282,7 +2470,7 @@ transferToImageBitmap(): ImageBitmap
| 类型 | 说明 |
| ---------------------------------------- | --------------- |
| [ImageData](ts-components-canvas-imagebitmap.md) | 存储离屏画布上渲染的像素数据。 |
| [ImageBitmap](ts-components-canvas-imagebitmap.md) | 存储离屏画布上渲染的像素数据。 |
**示例：**
......@@ -2291,10 +2479,11 @@ transferToImageBitmap(): ImageBitmap
// xxx.ets
@Entry
@Component
struct CanvasExample {
struct PutImageData {
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -2302,7 +2491,14 @@ transferToImageBitmap(): ImageBitmap
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.offContext.restore()
var imageData = this.offContext.createImageData(100, 100)
for (var i = 0; i < imageData.data.length; i += 4) {
imageData.data[i + 0] = 255
imageData.data[i + 1] = 0
imageData.data[i + 2] = 255
imageData.data[i + 3] = 255
}
this.offContext.putImageData(imageData, 10, 10)
var image = this.offContext.transferToImageBitmap()
this.context.transferFromImageBitmap(image)
})
......@@ -2312,6 +2508,7 @@ transferToImageBitmap(): ImageBitmap
}
}
```
![zh-cn_image_0000001238952387](figures/zh-cn_image_0000001238952387.png)
### restore
......@@ -2323,12 +2520,13 @@ restore(): void
```ts
// xxx.ets
@Entry
@Component
struct CanvasExample {
@Entry
@Component
struct CanvasExample {
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -2336,7 +2534,11 @@ restore(): void
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.offContext.restore()
this.offContext.save(); // save the default state
this.offContext.fillStyle = "green";
this.offContext.fillRect(20, 20, 100, 100);
this.offContext.restore(); // restore to the default state
this.offContext.fillRect(150, 75, 100, 100);
var image = this.offContext.transferToImageBitmap()
this.context.transferFromImageBitmap(image)
})
......@@ -2344,8 +2546,9 @@ restore(): void
.width('100%')
.height('100%')
}
}
}
```
![zh-cn_image_000000127777781](figures/zh-cn_image_000000127777781.png)
### save
......@@ -2358,12 +2561,13 @@ save(): void
```ts
// xxx.ets
@Entry
@Component
struct CanvasExample {
@Entry
@Component
struct CanvasExample {
private settings: RenderingContextSettings = new RenderingContextSettings(true)
private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
private offContext: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(600, 600, this.settings)
build() {
Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
Canvas(this.context)
......@@ -2371,7 +2575,11 @@ save(): void
.height('100%')
.backgroundColor('#ffff00')
.onReady(() =>{
this.offContext.save()
this.offContext.save(); // save the default state
this.offContext.fillStyle = "green";
this.offContext.fillRect(20, 20, 100, 100);
this.offContext.restore(); // restore to the default state
this.offContext.fillRect(150, 75, 100, 100);
var image = this.offContext.transferToImageBitmap()
this.context.transferFromImageBitmap(image)
})
......@@ -2379,8 +2587,9 @@ save(): void
.width('100%')
.height('100%')
}
}
}
```
![zh-cn_image_000000127777781](figures/zh-cn_image_000000127777781.png)
### createLinearGradient
......
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