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// STERN.BAS 29.04.1996
// STERN.CPP 11.02.2000
// STERN.C   11.07.2003
// stern.c   07.02.2004

#include <X11/Xlib.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>

void Calc3D(void);
void DrawObject(void);
void InitProgram(void);
void MainLoop(void);
void Rotation(void);

#define SLEEP 50000
#define WIDTH 320
#define HIGHT 320
#define X_POS 0
#define Y_POS 0
#define BORDER 2
#define PI 3.1415926
#define Lines 72

/* Lines 36
static int World[Lines][3] = {
		-60, 40, 20,	-20, 40, 20,
		-20, 40, 20,	-20,  0, 20,
		-20,  0, 20,	 60,  0, 20,
		 60,  0, 20,	 60,-40, 20,
		 60,-40, 20,	-60,-40, 20,
		-60,-40, 20,	-60, 40, 20,

		-60, 40,-20,	-20, 40,-20,
		-20, 40,-20,	-20,  0,-20,
		-20,  0,-20,	 60,  0,-20,
		 60,  0,-20,	 60,-40,-20,
		 60,-40,-20,	-60,-40,-20,
		-60,-40,-20,	-60, 40,-20,

		-60, 40, 20,	-60, 40,-20,
		-20, 40, 20,	-20, 40,-20,
		-20,  0, 20,	-20,  0,-20,
		 60,  0, 20,	 60,  0,-20,
		 60,-40, 20,	 60,-40,-20,
		-60,-40, 20,	-60,-40,-20};
*/
/* Lines 72 */
static int World[Lines][3] = {
	 90,  0,  0,   10, 10, 10,     90,  0,  0,   10, 10,-10,
	 90,  0,  0,   10,-10,-10,     90,  0,  0,   10,-10, 10,
	-90,  0,  0,  -10, 10, 10,    -90,  0,  0,  -10, 10,-10,
	-90,  0,  0,  -10,-10,-10,    -90,  0,  0,  -10,-10, 10,
	  0, 90,  0,   10, 10, 10,      0, 90,  0,  -10, 10, 10,
	  0, 90,  0,  -10, 10,-10,      0, 90,  0,   10, 10,-10,
	  0,-90,  0,   10,-10, 10,      0,-90,  0,  -10,-10, 10,
	  0,-90,  0,  -10,-10,-10,      0,-90,  0,   10,-10,-10,
	  0,  0, 90,   10, 10, 10,      0,  0, 90,   10,-10, 10,
	  0,  0, 90,  -10,-10, 10,      0,  0, 90,  -10, 10, 10,
	  0,  0,-90,   10, 10,-10,      0,  0,-90,   10,-10,-10,
	  0,  0,-90,  -10,-10,-10,      0,  0,-90,  -10, 10,-10,
	 10, 10, 10,  -10, 10, 10,     10,-10, 10,  -10,-10, 10,
	 10, 10,-10,  -10, 10,-10,     10,-10,-10,  -10,-10,-10,
	 10, 10, 10,   10,-10, 10,    -10, 10, 10,  -10,-10, 10,
	 10, 10,-10,   10,-10,-10,    -10, 10,-10,  -10,-10,-10,
	 10, 10, 10,   10, 10,-10,     10,-10, 10,   10,-10,-10,
	-10,-10, 10,  -10,-10,-10,    -10, 10, 10,  -10, 10,-10};


float X, Y, Z, sX, sY, Xa, Ya, Za, sXs, sYs, D, Page, Xmid, Ymid;
float R, R1, R2, R3, Sr1, Sr2, Sr3, Cr1, Cr2, Cr3, mX, mY, mZ;

Display *display;
Window win;
GC gc;
XGCValues values;

int main(void)
{
	InitProgram();
	MainLoop();
	XCloseDisplay(display);
	exit(0);
}


void InitProgram(void)
{
	int screen;

	display = XOpenDisplay(getenv("DISPLAY"));
	screen = DefaultScreen(display);
	win = XCreateSimpleWindow(display, RootWindow(display, screen),
				X_POS, Y_POS, WIDTH, HIGHT, BORDER,
				BlackPixel(display, screen),
				WhitePixel(display, screen));
	XMapWindow(display, win);
	XFlush(display);
	gc = XCreateGC(display, win, 0, &values);
	XSetForeground(display, gc, BlackPixel(display, screen));
	XSetBackground(display, gc, WhitePixel(display, screen));
	XSetLineAttributes(display, gc, 1, LineSolid, CapButt, JoinBevel);
	XSetFillStyle(display, gc, FillSolid);
	XSync(display, False);

	Xmid = WIDTH / 2;
	Ymid = HIGHT / 2;

	D  = 1200;      /* View point and rotation values */
	mZ = -850;
	mX = -5;
	R1 = 0;
	R2 = 0;
	R3 = 0.3;
}

void MainLoop(void)
{
	int k;
	while(1)
	{
		R += 0.1;
		if(R > (2 * PI)) R = 0;
		R1 = R;
		R2 = R;
		R3 = R;

		XClearWindow(display, win);
		DrawObject();
		XFlush(display);
		usleep(SLEEP);
	}
}

void DrawObject(void)
{
	int i;

	Rotation();
	for(i=0; i<Lines; i+=2)
	{
		X = World[i][0];
		Y = World[i][1];
		Z = World[i][2];
		Calc3D();
		sXs = sX;
		sYs = sY;

		X = World[i+1][0];
		Y = World[i+1][1];
		Z = World[i+1][2];
		Calc3D();

		XDrawLine(display, win, gc, sXs, sYs, sX, sY);
	}
}

void Calc3D(void)
{
	X  =  -1 * X;
	Xa = Cr1 * X  - Sr1 * Z;
	Za = Sr1 * X  + Cr1 * Z;
	X  = Cr2 * Xa + Sr2 * Y;
	Ya = Cr2 * Y  - Sr2 * Xa;
	Z  = Cr3 * Za - Sr3 * Ya;
	Y  = Sr3 * Za + Cr3 * Ya;
	X  = X + mX;
	Y  = Y + mY;
	Z  = Z + mZ;
	sX = Xmid + D * X / Z;
	sY = Ymid + D * Y / Z;
}

void Rotation(void)
{
	Sr1 = sin(R1);
	Sr2 = sin(R2);
	Sr3 = sin(R3);
	Cr1 = cos(R1);
	Cr2 = cos(R2);
	Cr3 = cos(R3);
}