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README.md

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1.egret.RenderTexture

Bitmaps in egret are displayed based on textures, and there are usually four ways to draw a static texture:

  • Get the texture property directly from the Bitmap you've created.

  • Through RES.getRes("run_down_png");directly obtained (if there is a use of Res module)

  • Obtained after loading by URLLoader

  • The bitmapData of the Texture object is assigned a value of the obtained data by the ImageLoader loader.

Besides, egret provides dynamic texture classegret.RenderTexture，used to display object and its children will draw a texture, in order to realize the screenshot function.

var renderTexture:egret.RenderTexture = new egret.RenderTexture();
renderTexture.drawToTexture(displayObject);

2.Methods

2.1.toDataURL()

Theegret.RenderTexture toDataURL()methods，convert texture into "data:image/png;base64," begins the base64 data.

Usage texture.toDataURL("image/png", new egret.Rectangle(20, 20, 100, 100));

  • The first parameter is the format you want to convert to, and currently only “image/png” and “image/jpeg” are supported.

  • The second parameter is the capture area, the default fortexturewhole size。

Note： Because of textureitself, the interception of conversion, so even if Bitmapzooming operations such as deformation, also won't affect texture interception area size.

2.2.saveToFile()

The egret.RenderTexture saveToFile() methods，cutting the designated area and save into images.

Usage：texture.saveToFile("image/png", "a/down.png", new egret.Rectangle(20, 20, 100, 100));

  • The first parameter is the image format

  • The second parameter is the name of the saved file (the path).

  • The third parameter is the truncated area

Note： The browser only supports saving names, so when you write "a/down.png", the browser automatically changes it to "a-down.png". The image will be saved in the browser download location.

Path can be saved under Native. The image will be saved in the game private space, path can not have.. / ". In order to be compatible with all platforms, it is recommended not to use paths.

The sample

Save the screenshot test, the code is as follows:

var texture:egret.Texture = RES.getRes("run_png");
texture.saveToFile("image/png", "a/down.png", new egret.Rectangle(20, 20, 100, 100));

Here are using saveToFile()generated views.

The original image

Interception of complex

2.3.drawToTexture()

The egret.RenderTexture saveToFile() methods，object map will display as a texture

It is important to note that this method will reduce the current texture clear, if you want to keep the previous texture, need to use 2 RenderTexture alternating drawing.

Used interchangeably RenderTexture sample code:

if (this.bmp.texture == this.renderTexture) {
    this.renderTexture2.drawToTexture(this, new egret.Rectangle(0, 0, 1024, 768));   
    this.bmp.texture = this.renderTexture2;
} else {
    this.renderTexture.drawToTexture(this, new egret.Rectangle(0, 0, 1024, 768)); 
    this.bmp.texture = this.renderTexture;
}

The this.bmp is to save the bitmap object sketchpad,this.renderTexture and this.renderTexture2 is used to store grain RenderTexture object.

Update drawing board texture with different from currentRenderTexture object to ensure the last texture will not be empty.

3. Screenshot of the sample

click onDynamic screen，you can view the complete code and effect of dynamic screen sample.