// ROT6.CPP
//
// Author : Saket Soni
// Requirements : DOS/Windows, Turbo C++ 3.0
//
// Description : Program displays a 3D cube which can be rotated
//     along x, y or z axis. To rotate along :
//       *) x-axis - press 'd'
//       *) y-axis - press 'a'
//       *) z-axis - press 'w'
//     To change the direction of rotation along any axis press 's'
//
//

////////////////////////////////////////////////////////////////////////////
// Header files ...
////////////////////////////////////////////////////////////////////////////
#include
#include
#include
#include
#include
#include"rotlib.h"







////////////////////////////////////////////////////////////////////////////
// Global constant declarations ...
////////////////////////////////////////////////////////////////////////////
const long double PI = 3.1415926535897932384626433832795L;
const long double to_degree = 180.0L/PI;  // used for conversion
const long double to_radian = PI/180.0L;  // between degree and radians
const char * const DRIVER_PATH = "\\tc\\bgi";  // Path for EGAVGA.BGI
															  // (graphics driver) file
const float ANGLE = 2;                    // rotation angle in degrees
extern float MaxX;
extern float MaxY;
extern float MidX;
extern float MidY;






////////////////////////////////////////////////////////////////////////////
// Startup code to initialize the graphics system ...
////////////////////////////////////////////////////////////////////////////
void startup_func()	{
	int gdriver = DETECT, gmode, errorcode;
	initgraph(&gdriver, &gmode, DRIVER_PATH);
	errorcode = graphresult();
	if (errorcode != grOk)
	{
		printf("\nGraphics error: %s\n", grapherrormsg(errorcode));
		printf("Is the path set in \"DRIVER_PATH\" macro for EGAVGA.BGI correct ?\n");
		printf("Press any key to halt ... ");
		getch();
		exit(1);
	}
	MaxX = getmaxx();
	MaxY = getmaxy();
	MidX = MaxX/2;
	MidY = MaxY/2;
	setlinestyle(SOLID_LINE,0,THICK_WIDTH);
}
#pragma startup startup_func 64







////////////////////////////////////////////////////////////////////////////
// Shutdown code to close the graphics system ...
////////////////////////////////////////////////////////////////////////////
void exit_func()	{
	closegraph();
}
#pragma exit exit_func 64








////////////////////////////////////////////////////////////////////////////
// Main function ...
////////////////////////////////////////////////////////////////////////////
int main()
{
	// required variables ...
//	CBosS b1();
//	CBoxS b1(50,50,50,150,150,150);
//	CBoxS b1(-120,-120,-120,240,240,240);
	CBoxS b1(-20,-20,-20,40,40,40);
											 // b1 is a 3D cube
	float angle = ANGLE*to_radian; // to rotate by ANGLE degrees
	int dir = 1;                   // to control direction of rotation
	char ch;                       // to rotate along what (x,y or z)?

	// draw the reference lines ...
/*	setcolor(LIGHTRED);
	line(0,MidY,MaxX,MidY);
	line(MidX,0,MidX,MaxY);
*/
	// draw the cube ...
	setcolor(YELLOW);
	b1.draw();

	// set the rotation angle ...
	CVertex::set_theta(angle);

	// repeat while user presses ESC ...
	while ( (ch=getch()) != 27 )
	{
		// erase the previous cube from the screen ...
//		clearviewport();
//		setcolor(BLACK);
//		b1.show();
		b1.hide();
/*		setcolor(LIGHTRED);
		setlinestyle(SOLID_LINE,SOLID_FILL,THICK_WIDTH);
		line(0,MidY,MaxX,MidY);
		line(MidX,0,MidX,MaxY);
*/
		// rotate the cube ...
		switch (ch)
		{
		case 'A':
		case 'a':      // rotate along y if 'a' is pressed
			b1.rotate_y();
			break;

		case 'D':
		case 'd':      // rotate along x if 'd' is pressed
			b1.rotate_x();
			break;

		case 'W':
		case 'w':      // rotate along z if 'w' is pressed
			b1.rotate_z();
			break;

		case 'S':
		case 's':// change the direction if 's' is pressed
			dir = dir * (-1);
			CVertex::set_theta(angle*dir);
			break;
		default:
			printf("\a");
		}

		// redraw the cube on the screen
		setcolor(YELLOW);
		b1.draw();
//		delay(20);
	}

	return 0;  // return successfully
}