/*
==============================================================================
                      WordUp Graphics Toolkit Version 5.0                     
                             Demonstration Program 27                         
                                                                              
 Draws some circles, captures a block, and skews the block while rotating    
 the colors.                                                                 
                                                                              
 *** PROJECT ***                                                             
 This program requires the file WGT5_WC.LIB to be linked.                    
                                                                              
 *** DATA FILES ***                                                          
 NONE                                                                        
                                                           WATCOM C++ VERSION 
==============================================================================
*/

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


void main(void)
{
  block skewit;                 /* Pointer to our block */
  color palette[256];           /* Our palette */
  short oldmode;                /* Store initial video mode */
  short i = 0;                  /* Loop counter */

  if ( !vgadetected () )
  {
    printf("Error - VGA card required for any WGT program.\n");
    exit (0);
  }
  printf ("WGT Example #27\n\n");
  printf ("A bitmap is skewed left and right while the palette is rotated.\n");
  printf ("Press a key to end the program at any time.\n");
  printf ("\n\nPress any key to continue.\n");
  getch ();


  oldmode = wgetmode ();           /* Gets the current mode */
  vga256 ();                       /* Initialize graphics mode */

  wreadpalette (0, 255, palette);  /* Store our current palette */

  wcls (0);                        /* Clear screen with black */

  for (i = 100; i > 0; i--)        /* Draw 100 filled circles */
  {
    wsetcolor (i);
    wfill_circle (160, 100, i);
  }

  wsetcolor (0);                    /* Use black as active color */
  wbar (0, 0, 104, 199);            /* Draw two solid rectangles */
  wbar (216, 0, 319, 199);
  skewit = wnewblock (100, 40, 220, 160);     /* Grab a block for skewing */

  wcls (0);                              /* Clear screen with black */
  do
  {
    for (i = -100; i < 100; i += 2)      /* Skew image 2 pixels at a time */
    {
      wretrace ();
      wskew (100, 40, skewit, i);
      wcolrotate (1, 100, 0, palette);   /* Rotate palette too */
      wsetpalette (1, 100, palette);     /* And show palette changes */
    }
    for (i = 100; i > -100; i -= 2)      /* Skew image back to starting pos */
    {
      wretrace ();
      wskew (100, 40, skewit, i);
      wcolrotate (1, 100, 0, palette);   /* Rotate palette */
      wsetpalette (1, 100, palette);     /* Show palette changes */
    }
  } while (!kbhit ());                   /* Stop when key is pressed */

  getch ();
  wsetmode (oldmode);                    /* Restore initial video mode */
}