From:	nicblais AT my-deja DOT com
Newsgroups:	comp.os.msdos.djgpp
Subject:	Please help...matrix problem with Allegro
Date:	Tue, 05 Oct 1999 19:54:26 GMT
Organization:	Deja.com - Before you buy.
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Here's my problem.  I made an array called matrix
composed of 2 dimension, res_x (resolution of x)
and res_y.  I want to plot a pixel on the screen
but not if it already exists so if, let's say
that matrix[78][204] = 1, it means that at 78,204
there's a pixel.  If it were 0, there wouldn't be.

Here's my code part that does just that:  It
freezes my computer.

#define RGB makecol15

ushort run_program()
{
ushort pix_x;
ushort pix_y;
ushort color_red;
unsigned int matrix[res_x][res_y];

for (unsigned int i = 0; i < (res_x * res_y); i++)
     {
     if (keypressed())
        break;
     pix_x = (random() % res_x) + 1;
     pix_y = (random() % res_y) + 1;
     if (matrix[pix_x][pix_y] == 1)
        continue;
     else
          matrix[pix_x][pix_y] = 1;
     color_red = (random() % 255) + 1;
     putpixel(screen, pix_x, pix_y, RGB
(color_red, 0, 0));
     }
return 1;
}


Please help.  Sincerly, Nicolas Blais.


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