libGDX 从精灵或纹理中获取像素颜色-移动开发问题

libGDX get pixel color from sprite or texture(libGDX 从精灵或纹理中获取像素颜色)

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问题描述

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.

I was searching it on net but i wasn't able to find any solution. I have a sprite or a texture and when i touch it i want to get pixel color from touch coordinates.

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:)

推荐答案

类似以下的方法可能有效，但未经测试.您可以通过 sprite 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.

Something like the following might work, but is untested. You can get the color via the Pixmap of the sprite's Texture. You need to make sure that you are converting the input (screen) coordinates properly to the local coordinates of the texture.

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));
    }
}

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