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1	Game Development / Newbie & Debugging Questions / Re: Achieving transparency using RGB values	on: 2013-01-13 00:06:27
Quote from: HeroesGraveDev on 2013-01-13 00:00:55 Quote from: PhQ on 2013-01-12 23:50:08 Quote from: HeroesGraveDev on 2013-01-12 23:01:32 Just draw the shapes with alpha values in the colours. Seriously, why wouldn't you? A real man likes a challenge! @ pjt33 This is exactly what I needed. Thank you! It's not a challenge if you ask someone else for the answer. True I've been trying to do it for like 5 hours and it didn't work for me It's only a challenge if you can figure it out.

2	Game Development / Newbie & Debugging Questions / Re: Achieving transparency using RGB values	on: 2013-01-12 23:50:08
Quote from: HeroesGraveDev on 2013-01-12 23:01:32 Just draw the shapes with alpha values in the colours. Seriously, why wouldn't you? A real man likes a challenge! @ pjt33 This is exactly what I needed. Thank you!

3	Game Development / Newbie & Debugging Questions / Re: Achieving transparency using RGB values	on: 2013-01-12 22:34:26
Quote from: HeroesGraveDev on 2013-01-12 22:30:08 Try 0x7F000000 And btw, no matter how transparent the black is, it's not going to show on a black background. Sorry for not explaining very well. I need to transform the one pixel to a darker pixel thus creating an illusion of transparency. I believe 0x7F000000 will not work because I am using 1 BufferedImage to render things. The last image on the second row.

Game Development / Newbie & Debugging Questions / Achieving transparency using RGB values

on: 2013-01-12 22:23:59

Hi!
I am trying to draw a black box with transparency. You know.. a black box with like 50% opacity. And I'm not really sure how to do it, I have tried using http://en.wikipedia.org/wiki/Alpha_compositing , but I had no luck. Could anyone explain to me how to do it?
If you are wondering, here is what I have so far which is basically nothing:

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public void fillAlpha() {
      int x = 50;
      int y = 50;
      int w = 70;
      int h = 70;
      int background = 0x000000;
      
      for (int yy = y; yy < h + y; yy++) {
         for (int xx = x; xx < w + x; xx++) {
            
            pixels[xx + yy * width] = 0x000000;
            
         }
      }
   }

I have removed the formulas from the wikipedia page because I couldn't make them work.

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