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  Transparent rectangle using awt ?  (Read 2362 times)
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Offline ataris

Senior Newbie

« Posted 2005-08-10 21:58:53 »

This may sound like a bit of a silly question, but i was wondering if anyone knows how to draw a rectangle over the top of an image. So that i can see both the rectangle on top but also see the image underneath through it. Is this possible ?
Offline Jeff

JGO Coder

Got any cats?

« Reply #1 - Posted 2005-08-11 01:21:25 »

It sounds like you are describing translucency.

AWT doesnt support translucency yet, just 1 bit transparency.

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Offline rdcarvallo

Senior Devvie

Projects: 5
Exp: 15 years

2D Java games forever!

« Reply #2 - Posted 2005-08-11 14:55:01 »

Hi .
   As Jeff said, AWT doesn't support translucency (it supports it, but it's not hardware accelerated)
   But you want to draw a rectangle over the image, this can be done with:
//in your rendering code
g.setColor(new Color(0,0,255,100)); //The last param is the alpha that goes from 0: transparent to 255: opaque

    The only problem is that not being hardware acceleratred, this drops your performance and (almost) cannot be used in realtime applications.
    I use this trick to indicate selections in my tile editor (the tile selected is highlighted in blue).

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Offline ataris

Senior Newbie

« Reply #3 - Posted 2005-08-11 16:25:54 »

Yea, translucency was what i meant, not transparency  Roll Eyes

Thats brilliant rdcarvallo ! That's exactly what i need i think and for exactly the same reason you use it  Grin Will try it when i get in.
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