/*
 * Header Begins--Do not remove################################################
 *
 *	C-code driver that exercises the plotting package to produce circles,
 *	spheres and ellipses.
 *
 *	(c) Eugene Fiume, University of Toronto, 1995.
 *
 *	You are permitted to use this code for noncommercial, educational
 *	purposes only.  This header must not be removed from this file.
 *
 * Header Ends--Do not remove##################################################
 */
#include <stdio.h>
#include <math.h>
#include "Plot.h"

/*
 *	Some useful constants
 */

#define pi  3.141592654
#define pi4 3.141592654/4.0
#define pi8 3.141592654/8.0
#define nt  24
#define ns  24


/* 
 *	Parametric functions for a circle of radius 1.
 */
double foo(t)
	double t;
{
	return t;
}

double circx(t)
	double t;
{
	return(cos(t));
} /* circx */


double circy(t)
	double t;
{
	return(sin(t));
} /* circy */



/* 
 *	Parametric functions for a sphere of radius 1.
 */
double sphx(theta, phi)
	double theta, phi;
{
	return(cos(theta)*sin(phi));
} /* sphx */

double sphy(theta, phi)
	double theta, phi;
{
	return(sin(theta)*sin(phi));
} /* sphy */

double sphz(theta, phi)
	double theta, phi;
{
	return(cos(phi));
} /* sphz */



/*
 *	Parametric functions for an ellipse
 */

double ellx(theta, phi)
	double theta, phi;
{
	return(1.5*cos(theta)*sin(phi));
} /* ellx */

double elly(theta, phi)
	double theta, phi;
{
	return(0.75*sin(theta)*sin(phi));
} /* elly */

double ellz(theta, phi)
	double theta, phi;
{
	return(0.5*cos(phi));
} /* ellz */


main(argc, argv)
	int argc;
	char *argv[];
{
	printf("2D and 3D Plotting Demonstration\n");
	XOpen(800,800, argc, argv);

	/*
	 *	Let's plot something
	 */

	printf("First, a circle.  Hit a mouse button to start.\n");
	GetEvent();
	SetScale(100.0,100.0);
	SetOffset(150,150);
	SetColour(1);
	Plot2D(circx,circy,0.0,2.0*pi,128);

	printf("Next, a sphere.  Hit a mouse button to continue.\n");
	GetEvent();
	SetRotation(pi8,pi8,pi8);
	SetColour(2);
	SetOffset(500,100);
	Plot3D(sphx,sphy,sphz, 0.0,2.0*pi,ns, 0.0,pi,nt);

	printf("Last, an ellipse.  Hit a mouse button to continue.\n");
	GetEvent();
	SetColour(3);
	SetOffset(400,250);
	Plot3D(ellx,elly,ellz, 0.0,2.0*pi,ns, 0.0,pi,nt);

	printf("We're done.  Hit a mouse button to stop.\n");
	GetEvent();
}