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  [Libgdx] Strange issue when scaling a sprite  (Read 528 times)
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Offline opilkin

Senior Newbie





« Posted 2014-05-08 17:16:32 »

I'm trying to stretch a sprite to screen bounds uniformly. First I set the origin of the sprite to the centre of the screen. Since it's an Android device, I have several pages to scroll through to reach the end. In my experience, width*2 covers the extra distance.

1  
2  
mSprite.setOrigin(Gdx.graphics.getWidth(), Gdx.graphics.getHeight()/2);
//these return 1080 and 960 on my device

Next I set the sprite's X and Y relative to the origin:

1  
2  
mSprite.setPosition(mSprite.getOriginX()-mSprite.getWidth()/2, mSprite.getOriginY()-mSprite.getHeight()/2);
//sprite width and height are 1440 and 1280

Now draw it with
1  
mSprite.draw(batch)




To a naked eye, it doesn't look off. Having measured the distance, there is no difference.

Now I apply a scale:

1  
mSprite.setScale(1.2f, 1.2f);


Result:



As you can see, after scaling, the sprite no longer appears to be in the centre.

Why? What am I doing wrong? If this is how it's supposed to work, can anyone please recommend a viable workaround to uniformly scale a sprite?

Thanks
Offline bilznatch

JGO Coder


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« Reply #1 - Posted 2014-05-09 04:20:37 »

use:
1  
mSprite.setOriginCenter();

do this after setting the position, and remove your setOrigin line of code.
Offline opilkin

Senior Newbie





« Reply #2 - Posted 2014-05-12 11:31:49 »

Thanks, I figured it out. Origin should be set to centre of the sprite. I shouldn't have set my position relative to the origin. It should be set relative to the surface instead.
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