PRODUCT  :  Borland C++                           NUMBER  :  1302
  VERSION  :  3.x
       OS  :  DOS
     DATE  :  October 25, 1993                         PAGE  :  1/2

    TITLE  :  How to display black text using BGI graphics.




  QUESTION: How do I display black text in bgi graphics?  Attempts
            to display text after a call to setcolor(BLACK) fail
            after a previous call to setbkcolor().

  ANSWER:   The zeroth entry in the palette is the background
            color. When setbkcolor() was called the index to BLACK
            was lost. To fix this replace one of the palette
            entries with BLACK and use that index for BLACK.

  EXAMPLE:

  #include <graphics.h>
  #include <stdlib.h>
  #include <stdio.h>
  #include <conio.h>
  #define NEWCOLOR 5 //we will take over color number 5 in palette

  int main(void)
  {
     char msg[80]= "this is a test";
     int bkcol, maxcolor, x, y;
     int gdriver = DETECT, gmode, errorcode;

     /* initialize graphics mode */
     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);             /* return with error code */
     }

     /* for centering text messages */
     settextjustify(CENTER_TEXT, CENTER_TEXT);
     x = getmaxx() / 2;
     y = getmaxy() / 2;

     setpalette(NEWCOLOR, BLACK);  //set one color number to BLACK













  PRODUCT  :  Borland C++                           NUMBER  :  1302
  VERSION  :  3.x
       OS  :  DOS
     DATE  :  October 25, 1993                         PAGE  :  2/2

    TITLE  :  How to display black text using BGI graphics.




     /* select a new background color */
     setbkcolor(RED);

     /* select a new color */
     setcolor(NEWCOLOR);

     /* output a messsage */
        outtextxy(x, y, msg);
        getch();
     /* clean up */
     closegraph();
     return 0;
  }


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