/*
==============================================================================
                      WordUp Graphics Toolkit Version 5.0                     
                             Demonstration Program 24                         
                                                                              
 Display special effects using wwipe command.                                
                                                                              
 *** PROJECT ***                                                             
 This program requires the file WGT5_WC.LIB to be linked.                    
                                                                              
 *** DATA FILES ***                                                          
 Make sure that you have WGT2.PCX in your executable directory. 
                                                           WATCOM C++ VERSION 
==============================================================================
*/

#include <conio.h>
#include <stdio.h>
#include <wgt5.h>


void main(void)
{
  block screen1, screen2;                /* Two virtual screens */
  color palette[256];                    /* Our palette */
  short i, j;                            /* Loop counters */
  short oldmode;                         /* Stores initial video mode */

  if ( !vgadetected () )
  {
    printf("Error - VGA card required for any WGT program.\n");
    exit (0);
  }
  printf ("WGT Example #24\n\n");
  printf ("The WWIPE command is used to show several different screen wipes.\n");
  printf ("Using WRETRACE keeps the speed constant on all computers. Try removing\n");
  printf ("all retraces to obtain maximum speed and notice the difference.\n");
  printf ("A keypress advances to the next wipe at each point.\n");
  printf ("\n\nPress any key to continue.\n");
  getch ();

  oldmode = wgetmode ();                /* Preserve initial video mode */
  vga256 ();                            /* Initialize graphics mode */

  screen1 = wloadpcx ("wgt2.pcx", palette);  /* Load image file from disk */
  wtextcolor (15);                      /* Use index 15 for text */

  /* Note: This text will be on our second screen - used for wipes */
  wouttextxy (0, 0, NULL, "SCREEN BUFFER #2");
  wouttextxy (0, 50, NULL, "This screen is one of our 2 screens");
  wouttextxy (0, 58, NULL, "used to perform the wipe effect.");
  wouttextxy (46, 100, NULL, "Press a key to perform wipe");

  screen2 = wnewblock (0, 0, 319, 199); /* Allocate memory for screen2 */
  wnormscreen ();                       /* Make sure we're drawing on default screen */
  wsetpalette (0, 255, palette);        /* Now use the palette */

  getch ();                             /* Get a keypress */

  for (i = 0; i < 200; i++)
  {
    wwipe (0, 0, 319, i, screen1);           /* Wipe screen down from right */
    wwipe (319, 199, 0, 199 - i, screen1);   /* Wipe screen up from left */
    wretrace ();
  }
  getch ();


  /* Now wipe on the black screen using horizontal lines meeting at middle */
  for (i = 0; i < 100; i++)
  {
    wwipe (0, i, 319, i, screen2);
    wwipe (0, 199 - i, 319, 199 - i, screen2);
    wretrace ();
  }
  getch ();

  /* Now perform a "circular" wipe, by going around the screen from center */
  for (i = 0; i < 320; i++)
   {
    wwipe (159, 99, i, 0, screen1);
    wretrace ();
   }
  for (i = 0; i < 200; i++)
   {
    wwipe (159, 99, 319, i, screen1);
    wretrace ();
   }
  for (i = 319; i >= 0; i--)
   {
    wwipe (159, 99, i, 199, screen1);
    wretrace ();
   }
  for (i = 199; i >= 0; i--)
   {
    wwipe (159, 99, 0, i, screen1);
    wretrace ();
   }
  getch ();

  /* Clear with black screen by wiping top to bottom */
  for (i = 0; i < 200; i++)
   {
    wwipe (0, i, 319, i, screen2);
    wretrace ();
   }
  getch ();

  wfreeblock (screen1);          /* Remember to free that memory */
  wfreeblock (screen2);
  wsetmode (oldmode);            /* Restore initial video mode */
}