CS-460/560
Spring, 1998
R. Eckert

BITMAPPED CHARACTERS--AN ILLUSTRATION

The following illustrates how a 'T' could be displayed using the bitmapped technique:


1. Define the bitmap for the letter. The following is one possibility for a 'T'-

   int t[7][7] = { {0,0,0,0,0,0,0}, {0,1,1,1,1,1,0}, {0,0,0,1,0,0,0},
                                 {0,0,0,1,0,0,0}, {0,0,0,1,0,0,0}, {0,0,0,1,0,0,0},
                                 {0,0,0,0,0,0,0}};   /* bitmap for the letter T */

[In general, we could have a file that contains similar bitmap descriptions 
of each character in the character set that is to be displayed.]


2. Define the function that will display the bitmap letter[][] at pixel
   coordinates (x,y)--

   disp_letter (int x, int y, int letter[7][7])
   {
   int i,j;
   for (i=0; i<7; i++)
          for (j=0; j<7; j++)
                 if (letter[i][j] == 1)
                        setpixel(x+j,y+i,3);  /* plot the letter from its bitmap */
   }

[Here we are assuming that we have a pixel-setting function, setpixel(x,y)]


3. Call the function, passing it the desired letter's bitmap--

   disp_letter (50,100,t);  /* draw a 'T' at (50,100) */


In a Win32 application, the disp_letter() function would be called from the WndProc().