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c:graphics.h:setrgbpalette [2015/05/06 23:06] (current)
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 +===== setrgbpalette =====
 +
 +
 +====Syntax of setrgbpalette ==== 
 + <code c>
 +#include <graphics.h>
 +void setrgbpalette(int colornum, int red, int green, int blue);
 +  </code>
 +
 +
 +==== Description of setrgbpalette ==== 
 +<code c>
 +setrgbpalette can be used with the IBM 8514 and VGA drivers.
 +colornum defines the palette entry to be loaded, while red, green, and
 +blue define the component colors of the palette entry.
 +For the IBM 8514 display (and the VGA in 256K color mode), colornum is in
 +the range 0 to 255. For the remaining modes of the VGA, colornum is in
 +the range 0 to 15. Only the lower byte of red, green, or blue is used,
 +and out of each byte, only the 6 most significant bits are loaded in the
 +palette.
 +For compatibility with other IBM graphics adapters, the BGI driver
 +defines the first 16 palette entries of the IBM 8514 to the default
 +colors of the EGA/VGA. These values can be used as is, or they can be
 +changed using setrgbpalette.
 +</code>
 +
 +
 +==== Example of setrgbpalette ====
 +<code c>
 +/* setrgbpalette example */
 +
 +#include <graphics.h>
 +#include <stdlib.h>
 +#include <stdio.h>
 +#include <conio.h>
 +
 +int main(void)
 +{
 +   /* select driver and mode that supports use of setrgbpalette */
 +   int gdriver = VGA, gmode = VGAHI, errorcode;
 +   struct palettetype pal;
 +   int i, ht, y, xmax;
 +
 +   /* initialize graphics and local variables */
 +   initgraph(&gdriver, &gmode, "");
 +
 +   /* read result of initialization */
 +   errorcode = graphresult();
 +   if (errorcode != grOk) {  /* an error occurred */
 +
 +printf("Graphics error: %s\n", grapherrormsg(errorcode));
 +printf("Press any key to halt:");
 +getch();
 +exit(1);   /* terminate with an error code */
 +   }
 +
 +   /* grab a copy of the palette */
 +   getpalette(&pal);
 +
 +
 +   /* create gray scale */
 +   for (i=0; i<pal.size; i++)
 +setrgbpalette(pal.colors[i], i*4, i*4, i*4);
 +
 +   /* display the gray scale */
 +   ht = getmaxy() / 16;
 +   xmax = getmaxx();
 +   y = 0;
 +   for (i=0; i<pal.size; i++) {
 +
 +setfillstyle(SOLID_FILL, i);
 +bar(0, y, xmax, y+ht);
 +y += ht;
 +   }
 +
 +   /* clean up */
 +   getch();
 +   closegraph();
 +   return 0;
 +}
 +</code>
 +
 +
 +==== See also ====
 +[[setpalette]]
 +
 +
 +===== output of setrgbpalette example ===== 
 +
 +    no output of example at the moment
 +    do not hesitate and add it...  
 +
 +
  
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c/graphics.h/setrgbpalette.txt · Last modified: 2015/05/06 23:06 (external edit)

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