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c:graphics.h:getpalette

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c:graphics.h:getpalette [2015/05/06 23:06] (current)
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 +===== getpalette =====
 +
 +
 +====Syntax of getpalette ==== 
 + <code c>
 +#include <graphics.h>
 +void getpalette(struct palettetype *palette);
 +  </code>
 +
 +
 +==== Description of getpalette ==== 
 +<code c>
 +getpalette fills the palettetype structure pointed to by palette with
 +information about the current palette's size and colors.
 +The MAXCOLORS constant and the palettetype structure used by getpalette
 +are defined in graphics.h as follows:
 +#define MAXCOLORS  15
 +
 +struct palettetype {
 +   unsigned char size;
 +   signed char colors[MAXCOLORS + 1];
 +};
 +size gives the number of colors in the palette for the current graphics
 +driver in the current mode.
 +colors is an array of size bytes containing the actual raw color numbers
 +for each entry in the palette.
 +getpalette cannot be used with the IBM-8514 driver.
 +</code>
 +
 +
 +==== Example of getpalette ====
 +<code c>
 +/* getpalette example */
 +
 +#include <graphics.h>
 +#include <stdlib.h>
 +#include <stdio.h>
 +#include <conio.h>
 +
 +int main()
 +{
 +
 +   /* request autodetection */
 +   int gdriver = DETECT, gmode, errorcode;
 +   struct palettetype pal;
 +   char psize[80], pval[20];
 +   int i, ht;
 +   int y = 10;
 +
 +   /* 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);
 +
 +   /* convert palette info into strings */
 +   sprintf(psize, "The palette has %d modifiable entries.", pal.size);
 +
 +   /* display the information */
 +   outtextxy(0, y, psize);
 +   if (pal.size != 0) {
 +ht = textheight("W");
 +
 +y += 2*ht;
 +outtextxy(0, y, "Here are the current values:");
 +y += 2*ht;
 +for (i=0; i<pal.size; i++, y+=ht) {
 +   sprintf(pval, "palette[%02d]: 0x%02X", i, pal.colors[i]);
 +   outtextxy(0, y, pval);
 +}
 +   }
 +
 +   /* clean up */
 +   getch();
 +   closegraph();
 +   return 0;
 +}
 +</code>
 +
 +
 +==== See also ====
 +[[getbkcolor]]
 +[[getcolor]]
 +[[getdefaultpalette]]
 +[[getmaxcolor]]
 +[[setallpalette]]
 +[[setpalette]]
 +
 +
 +===== output of getpalette example ===== 
 +
 +    no output of example at the moment
 +    do not hesitate and add it...  
 +
 +
  
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c/graphics.h/getpalette.txt · Last modified: 2015/05/06 23:06 (external edit)

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