egret-docs-master/Engine2D/bitmapTexture/fillMode/README.md

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位图的填充方式有两种,
* 拉伸图像以填充区域
* 重复图像以填充区域
### 1.拉伸图像填充
创建 `Bitmap` 对象时会默认选择第一种填充方式。
下面是的示例中使用默认填充方式。使用的纹理图片为一张100*100的图片。图像宽度设置为2倍高度设置为3倍。
```javascript
class BitmapTest extends egret.DisplayObjectContainer{
public constructor()
{
super();
this.addEventListener(egret.Event.ADDED_TO_STAGE,this.onAddToStage,this);
}
private onAddToStage(event:egret.Event) {
RES.addEventListener(RES.ResourceEvent.GROUP_COMPLETE, this.onGroupComp, this);
RES.loadConfig("resource/resource.json", "resource/");
RES.loadGroup("preload");
}
private onGroupComp()
{
var img:egret.Bitmap = new egret.Bitmap();
img.texture = RES.getRes("box");
img.width *= 2;
img.height *= 3;
this.addChild(img);
}
}
```
编译后运行,效果如图:
![](56614f986ab98.png)
### 2.重复图像填充
设置填充方法需要改变 `Bitmap` 中的 `fillMode` 属性。
```javascript
img.fillMode = egret.BitmapFillMode.REPEAT
```
具体示例代码如下:
```javascript
class BitmapTest extends egret.DisplayObjectContainer{
public constructor()
{
super();
this.addEventListener(egret.Event.ADDED_TO_STAGE,this.onAddToStage,this);
}
private onAddToStage(event:egret.Event) {
RES.addEventListener(RES.ResourceEvent.GROUP_COMPLETE, this.onGroupComp, this);
RES.loadConfig("resource/resource.json", "resource/");
RES.loadGroup("preload");
}
private onGroupComp()
{
var img:egret.Bitmap = new egret.Bitmap();
img.texture = RES.getRes("box");
img.fillMode = egret.BitmapFillMode.REPEAT;
img.width *= 2;
img.height *= 3;
this.addChild(img);
}
}
```
编译后运行,效果如图:
![](56614f988d39e.png)