libGDX 从精灵或纹理中获取像素颜色

Question

我在网上搜索它，但我找不到任何解决方案。我有一个精灵或纹理，当我触摸它时，我想从触摸坐标中获取像素颜色。

所以我有：

 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());
            }
        }

有可能吗？谢谢你:)

Answer 1

以下内容可能有效，但未经测试。您可以通过精灵的Texture 的Pixmap 获取颜色。您需要确保将输入（屏幕）坐标正确转换为纹理的本地坐标。

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));
    }
}