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  Using bitwise operators to create a gradient  (Read 2231 times)
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Offline Porlus

Junior Devvie





« Posted 2012-04-09 23:49:22 »

Hi all,
I have a starting colour:

int col = 0xFF000000;

And I'm trying to create a loop that increases that colour to 0xFF111111 and then 0xFF222222 and so on. Is there an easier way of doing this with bitwise operators than doing it manually?

Thanks in advance

Paul
Offline davedes
« Reply #1 - Posted 2012-04-10 00:03:48 »

How are you rendering?

Why do you need the step size to be so particular? (to be exact, 17 bytes)

Why not just increment RGB values gradually to produce a smooth gradient?

Offline Porlus

Junior Devvie





« Reply #2 - Posted 2012-04-10 00:06:15 »

I'm putting the pixel straight into a bufferedimage with setRGB. I'm just trying to loop through and change that colour to one grade high each time.
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Offline SimonH
« Reply #3 - Posted 2012-04-10 00:30:58 »

How about;
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      for (int i=0;i<16;i++)
      {
          int col=0xFF000000;
          for (int j=0;j<24;j+=4)
          {
              col|=(i<<j);
          }
          System.out.println(Integer.toHexString(col));
      }

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Offline Porlus

Junior Devvie





« Reply #4 - Posted 2012-04-10 00:36:43 »

Ah, that's exactly what I wanted. Smiley Thanks!
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