/**********************************************************************/
/*                                                                    */
/*            (c) Copyright, 1997 by Professor Gabriel Robins         */
/*                                                                    */
/*      Department of Computer Science, University of Virginia        */
/*          Charlottesville, VA 22903-2442  (804) 982-2207            */
/*   robins@cs.virginia.edu    http://www.cs.virginia.edu/~robins/    */
/*                                                                    */
/*   This code may be freely used for all non-commercial purposes.    */
/*   All copies/portions of this code must contain this header.       */
/*                                                                    */
/**********************************************************************/

/**********************************************************************/
/*                      Graphics.c                                    */
/**********************************************************************/

#include "geometry.h"


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

int scale(int value)
{
return((int) (value * ((float) window_height) / grid_size));

}

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

void draw_point(int x, int y, int diameter)
{

#ifdef MAC

int offset= diameter/2;
Rect myRect;

if(GRAPHICS)
{
SetPort(CGWindow);
SelectWindow(CGWindow);
SetRect(&myRect, scale(x) - offset, scale(y) - offset,
                 scale(x) - offset + diameter, scale(y) - offset + diameter);
FillOval(&myRect, black);
}
#endif


#ifdef SUN

int offset= diameter;

if(GRAPHICS)
{
XFillArc(the_display,window,gc,
	 scale(x) - offset, scale(y) - offset,
         offset, offset,
	 0,64*360);
XFlush(the_display);
sleep(wait);
}
#endif
}


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

void draw_line(struct point p1, struct point p2, int thickness)
{

#ifdef MAC
int offset=  thickness/2;
if(GRAPHICS)
{
SetPort(CGWindow);
SelectWindow(CGWindow);
PenSize(thickness,thickness);
MoveTo(scale(p1.X) - offset, scale(p1.Y) - offset );
LineTo(scale(p2.X) - offset, scale(p2.Y) - offset);
}
#endif

#ifdef SUN
int offset=  thickness;
if (GRAPHICS)
{
XDrawLine ( the_display, window, gc,
	   scale(p1.X) - offset, scale(p1.Y) - offset,  
	   scale(p2.X) - offset, scale(p2.Y) - offset);
XFlush(the_display);
sleep(wait);
}
#endif
}


void write_index(struct  point p1, int index)
{

#ifdef SUN

char  str1[10];
if (GRAPHICS)
{
  sprintf(str1,"%d",index);
  XDrawString ( the_display, window, gc,
	   scale(p1.X), scale(p1.Y),str1,2);
  XFlush(the_display);
  sleep(wait);
}
#endif
}

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

void erase_window(void)
{

#ifdef MAC

int x, y, diameter;

if(GRAPHICS)
{
Rect myRect;
SetPort(CGWindow);
SelectWindow(CGWindow);
SetRect(&myRect, 0, 0, window_width, window_height);
EraseRect(&myRect);
}
#endif

#ifdef	SUN
if (GRAPHICS)
{  
  XClearArea(the_display,window,0,0,0,0,1);
}
#endif
}