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  LibGDX rectangles not calculating negative width and heght  (Read 494 times)
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Offline kingroka123

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Medals: 72
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Exp: 2 years


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« Posted 2014-01-24 01:51:34 »

So i've implemented a highlighting box into my game (if not sure what I mean go here  Pointing kind of like this except in 2d) and it works perfectly if my mouse moves in a totally positive manner (+x and +y) but when I try to move my mouse in any negative (-x or -y) it won't move. here is my code :
note: this is the rectangle class from libGDX package
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com.badlogic.gdx.math.Rectangle

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public static Rectangle mbounds() {
      return new Rectangle(startX, startY, boxSizeX, boxSizeY);
   }

start x is where the mouse was clicked first and the boxSizes are the current mouse position minus the start position
so:
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boxSizeX=currentX -startX;
boxSizeY = currentY-startY;


any help would be great
btw, if anyone knows how to draw a rectangle of this kind straight from the function, please tell me thanks again

[EDIT] New Information!!! It seems that the problem may lie in the .overlaps() function because when I set a shape renderer to draw it, it drew correctly. Which means it is probably a problem with collision.

I get collision by calling:

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if(mbounds().overlaps(bounds()){
//do something
}


Offline Riven
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Exp: 16 years


Hand over your head.


« Reply #1 - Posted 2014-01-24 07:56:20 »

Just take the 2 coordinates of the start-point and end-point of your area, and calculate the rectangle as such:

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pMin.x = Math.min(p1.x, p2.x);
pMin.y = Math.min(p1.y, p2.y);
pMax.x = Math.max(p1.x, p2.x);
pMax.y = Math.max(p1.y, p2.y);

new Rectangle(pMin.x, pMin.y, pMax.x - pMin.x, pMax.y - pMin.y);

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