Libgdx Touch Coordination Confusion

as I understood, libGDX coordinate system set by default, so the (0,0) is located at the bottom left corner, like in the following picture: (source: gyazo.com) Is it possible to

Solution 1:

You'll need to use a camera to do this. If you're not using a camera, I'd highly recommend adding one in, as it makes things a lot easier. Simply call camera.setToOrtho(true), which will switch LibGDX's coordinate system to the one you want, (0,0) in the top left.

To do this with a certain viewport width and height other than what you get from Gdx.graphics.getWidth/Height(), you can call camera.setToOrtho(true, viewportWidth, viewportHeight).

Solution 2:

I don't know how to set it at top left corner but one thing you could is to convert input coordinate to libgdx coordinate. I hope that could help you or help somebody else :

intScreen_height= Gdx.graphics.getHeight(); // Your screen height    @OverridepublicbooleantouchDown(int screenX, int screenY, int pointer, int button) {
   System.out.println("X: " + screenX  + " Y: " + (Screen_height - screenY));
   this.instance.player.setLocation(screenX, (Screen_height - screenY));
returnfalse;
}

Solution 3:

Yes, and it's very easy. You just have to subtract from the Y value the height of the screen. So: The finger position Y = Heigh of the screen - the Y value you have found.

Solution 4:

There's an easier way: Just make the subtraction bellow

Gdx.graphics.getHeight()-screenY

Only this line of code is necessary, as you can see.

Solution 5:

Create the variable fingerY and use the subtraction:

fingerY= Gdx.graphics.getHeight()-screenY;

So, if screenY equals 10 from the left bottom corner and the height of the screen equals 240 pixels:

fingerY=240-10

Then fingerY=230 pixels from the bottom left corner, while it is 10 pixels from the top left corner.