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  Centering text in a JFrame  (Read 1264 times)
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Offline StonePickaxes

JGO Coder


Medals: 4
Projects: 2


Nathan Kramber


« Posted 2011-12-25 02:18:49 »

Is there a way, using g.drawString(), to automatically center text instead of trying to guess and check?

Thanks,

-Nathan

Check out my website!
Offline AbstractChaos

Senior Newbie


Medals: 2



« Reply #1 - Posted 2011-12-25 03:30:58 »

I've always done it by (for games at least)
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FontMetrics metrics = graphics.getFontMetrics(yourFont);
Rectangle rect = metrics.getStringBounds(str, graphics);


then using the JPanel size and performing a quick bit of math Smiley
Offline ghostsoldier23

Junior Devvie


Medals: 1



« Reply #2 - Posted 2011-12-29 05:45:04 »

Right so if you use FontMetrics as the above poster stated, you can think about it like this:

1.  You have the Rectangle bounds for both the JPanel and the String.
2.  You know the center of each rectangle is the same point... because that is the center.
3.  You get the center point by dividing the width and height of the JPanel both by 2.
4.  Subtract from that point the halved width and height of the String, and boom, you have the location for the string to be drawn.

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int strWidth = (int) rect.getWidth();
int strHeight = (int) rect.getHeight();
int pw = panel.getWidth();
int ph = panel.getHeight();

int centerX = pw/2;
int centerY = ph/2;

int strx = centerX - (strWidth/2);
int stry = centerY - (strHeight/2);

g.drawString(str, strx, stry);
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