画个圆圈咒诅你

public class CirDemo extends Group {
private Image image;
public CirDemo(){
Pixmap pixmap = new Pixmap(Gdx.files.internal("BG.png"));
//
// image = new Image(new Texture("BG.png"));
// addActor(image);
// TextureRegionDrawable drawable = (TextureRegionDrawable)image.getDrawable();
//
// TextureData textureData = drawable.getRegion().getTexture().getTextureData();
// textureData.prepare();
// Pixmap pixmap = drawable.getRegion().getTexture().getTextureData().consumePixmap();
int width = pixmap.getWidth();
int height = pixmap.getHeight();
int min = Math.min(width, height);
Pixmap.Blending blending = pixmap.getBlending();

    pixmap.setBlending(Pixmap.Blending.None);
    for (int i = 0; i < width; i++) {
        for (int i1 = 0; i1 < height; i1++) {
            float i2 = (i-width/2.0F) *(i-width/2.0F) + (i1-height/2.0F) *(i1-height/2.0F);
            if (i2>(min / 8.0F )*(min / 8.0F )){

// System.out.println("-------------------");
pixmap.drawPixel(i,i1, Color.valueOf("#44FFFFFF").toIntBits());
// int pixel = pixmap.getPixel(i, i1);
}
}
}
pixmap.setBlending(blending);

    Image image = new Image(new Texture(pixmap));
    addActor(image);

}

}

image.png