/*****************************************************************************
                           Include file for CS480
******************************************************************************
    Author: Stan Sclaroff
            Boston University Computer Science Dept.
            January 27, 1995
******************************************************************************
 Modifications:

******************************************************************************/

typedef struct {
  Colorindex *pixels;
  long w,h;
  long winid;
} Pixmap;

void draw_point(),set_pixmap(),post_pixmap(),free_pixmap(),close_window();
Pixmap *create_pixmap();
Device get_event();
long open_window();

#define Sign(A) ((A > 0.0) ? 1 : ((A < 0.0) ? -1 : 0))

#define	PI	        3.14159265358979323846

/* This macro writes a pixel to a pixmap */
#define write_pixel(pixmap,x,y,color) pixmap->pixels[x+y*pixmap->w] = color

/* This macro reads a pixel's color from a pixmap */
#define read_pixel(pixmap,x,y) (pixmap->pixels[x+y*pixmap->w])