libGDX從精靈或紋理獲取像素顏色

Question

我在網上搜索它，但我無法找到任何解決方案。我有一個精靈或紋理，當我觸摸它時，我想從觸摸座標獲得像素顏色。

，所以我必須：

if (Gdx.input.isTouched()) { 
      Rectangle spriteBounds = sprite.getBoundingRectangle(); 
      if (sprite.contains(Gdx.input.getX(), Gdx.input.getY())) { 
       //and here something like 
       //Color color = sprite.getPixelColor(Gdx.input.getX(), Gdx.input.getY()); 
      } 
     } 

這可能嗎？謝謝:)

Answer 1

像下面這樣的東西可能會工作，但未經測試。您可以通過精靈Texture的Pixmap獲取顏色。您需要確保將輸入（屏幕）座標正確轉換爲紋理的局部座標。

if (Gdx.input.isTouched()) { 
    Rectangle spriteBounds = sprite.getBoundingRectangle(); 
    if (spriteBounds.contains(Gdx.input.getX(), Gdx.input.getY())) { 
     Texture texture = sprite.getTexture(); 

     int spriteLocalX = (int) (Gdx.input.getX() - sprite.getX()); 
     // we need to "invert" Y, because the screen coordinate origin is top-left 
     int spriteLocalY = (int) ((Gdx.graphics.getHeight() - Gdx.input.getY()) - sprite.getY()); 

     int textureLocalX = sprite.getRegionX() + spriteLocalX; 
     int textureLocalY = sprite.getRegionY() + spriteLocalY; 

     if (!texture.getTextureData().isPrepared()) { 
      texture.getTextureData().prepare(); 
     } 
     Pixmap pixmap = texture.getTextureData().consumePixmap(); 
     return new Color(pixmap.getPixel(textureLocalX, textureLocalY)); 
    } 
}