#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <math.h>
#include <windows.h>
#include "winbgim.cpp"


int gprintf( int xloc, int yloc, char *fmt, ... )
{
  va_list  argptr;                      /* Argument list pointer        */
  char str[140];                        /* Buffer to build sting into   */
  int cnt;                              /* Result of SPRINTF for return */

  va_start( argptr, fmt );              /* Initialize va_ functions     */

  cnt = vsprintf( str, fmt, argptr );   /* prints string to buffer      */
  outtextxy( xloc, yloc, str );         /* Send string in graphics mode */
  //yloc += textheight( "H" ) + 2;      /* Advance to next line         */

  va_end( argptr );                     /* Close va_ functions          */

  return( cnt );                        /* Return the conversion count  */

}

float Cos[360];
float Sin[360];


struct Point{
public:
	float x,y,z;
};

class Matrix3D{
public:
   //Point verts[8];
   Point *verts;
   int numOfVerts;

   Matrix3D();
   Matrix3D(char filename[]);//loading
   ~Matrix3D();

   void draw();

   //origin
   float xo, yo, zo;

   //the connection lines.
   //int lines[12][2];
   int **lines;
   int numOfLines;


   void xyrot(int theta);
   void xzrot(int theta);
   void yzrot(int theta);

   void scale(float factor);
   void translate(int x, int y, int z);
};

Matrix3D::Matrix3D(){

	numOfVerts = 8;
   numOfLines = 12;

	verts = new Point[numOfVerts];

   lines = new int*[numOfLines];
   for(int i=0; i<numOfLines; i++)
   	lines[i] = new int[2];


//              x               y               z
	verts[0].x =-1; verts[0].y =-1; verts[0].z =-1;
	verts[1].x = 1; verts[1].y =-1; verts[1].z =-1;
   verts[2].x = 1; verts[2].y = 1; verts[2].z =-1;
   verts[3].x =-1; verts[3].y = 1; verts[3].z =-1;

   verts[4].x =-1; verts[4].y =-1; verts[4].z = 1;
   verts[5].x = 1; verts[5].y =-1; verts[5].z = 1;
   verts[6].x = 1; verts[6].y = 1; verts[6].z = 1;
   verts[7].x =-1; verts[7].y = 1; verts[7].z = 1;

 	//add lines. -1 for the array index
   lines[0][0] = 0; lines[0][1]=1;
   lines[1][0] = 1; lines[1][1]=2;
   lines[2][0] = 2; lines[2][1]=3;
   lines[3][0] = 3; lines[3][1]=0;

   lines[4][0] = 4; lines[4][1]=5;
   lines[5][0] = 5; lines[5][1]=6;
	lines[6][0] = 6; lines[6][1]=7;
	lines[7][0] = 7; lines[7][1]=4;

   lines[8][0] = 0; lines[8][1]=4;
   lines[9][0] = 1; lines[9][1]=5;
   lines[10][0] =2; lines[10][1]=6;
   lines[11][0] =3; lines[11][1]=7;

   xo=0; yo=0; zo=0;
}

Matrix3D::Matrix3D(char filename[])
{

	FILE *stream;
   if ((stream = fopen(filename, "r"))==NULL)
   {	printf("error opening %s", filename); getch(); exit(1);}

   //the first two numbers are the number of vertcies and number of lines
   fscanf(stream, "%f %f", &numOfVerts, &numOfLines);

  	verts = new Point[numOfVerts];

   lines = new int*[numOfLines];
   for(int i=0; i<numOfLines; i++)
   	lines[i] = new int[2];

   //the second three numbers are the origin coords.
   fscanf(stream, "%f %f %f", &xo, &yo, &zo);

   //reads in the verts
   for(int i=0; i<numOfVerts; i++)
   	fscanf(stream, "%f", &verts[i]);

   //reads in the line connections
   for(int i=0; i<numOfLines; i++)
   	fscanf(stream, "%f %f", &lines[i][0], &lines[i][1]);

   fclose(stream);
}

Matrix3D::~Matrix3D()
{
//clear out some of the dynamic stuff
	delete[] verts;

   for(int i=0; i<numOfLines; i++)
   	delete[] lines[i];
   delete[] lines;
}


void Matrix3D::draw()
{
   int point1, point2;

   float x1, y1, x2, y2;

   for(int i=0; i<12; i++)
   {
      point1 = lines[i][0];
      point2 = lines[i][1];

      x1 = ( verts[point1].x + xo)*360/(360+verts[point1].z+zo);
      y1 = ( -verts[point1].y + yo)*360/(360+verts[point1].z+zo);

      x2 = ( verts[point2].x + xo)*360/(360+verts[point2].z+zo);
      y2 = ( -verts[point2].y + yo)*360/(360+verts[point2].z+zo);

      //this makes the lines in the center of the screen
      line(x1+320, y1+240, x2+320, y2+240);

      //gprintf(x1+320, y1+240, "%i", point1);
   }
}

void Matrix3D::xyrot(int theta)
{
	for(int i=0; i<8; i++)
   {
		verts[i].x = ( verts[i].x * Cos[theta] + verts[i].y * Sin[theta] );
      verts[i].y = ( verts[i].y * Cos[theta] - verts[i].x * Sin[theta] );
   }

   xo = (xo * Cos[theta] + yo * Sin[theta]);
   yo = (yo * Cos[theta] - xo * Sin[theta]);

}

void Matrix3D::xzrot(int theta)
{
	for(int i=0; i<8; i++)
   {
		verts[i].x = ( verts[i].x * Cos[theta] + verts[i].z * Sin[theta] );
      verts[i].z = ( verts[i].z * Cos[theta] - verts[i].x * Sin[theta] );
   }

   xo = (xo * Cos[theta] + zo * Sin[theta]);
   zo = (zo * Cos[theta] - xo * Sin[theta]);

}

void Matrix3D::yzrot(int theta)
{
	for(int i=0; i<8; i++)
   {
		verts[i].z = ( verts[i].z * Cos[theta] + verts[i].y * Sin[theta] );
      verts[i].y = ( verts[i].y * Cos[theta] - verts[i].z * Sin[theta] );
   }

   zo = (zo * Cos[theta] + yo * Sin[theta]);
   yo = (yo * Cos[theta] - zo * Sin[theta]);

}

void Matrix3D::scale(float factor)
{
	for(int i=0; i<8; i++)
   {
		verts[i].x = ( verts[i].x * factor );
      verts[i].y = ( verts[i].y * factor );
      verts[i].z = ( verts[i].z * factor );
   }
}

void Matrix3D::translate(int x, int y, int z)
{
		xo = x;
      yo = y;
      zo = z;
}

void main()
{

 for(int i=0; i<360; i++)
 {
   	Cos[i]=cos(i*M_PI/180.0);
      Sin[i]=sin(i*M_PI/180.0);
 }


 initwindow(640, 480);

 Matrix3D cube;
 cube.scale(75);

 gprintf(0,0,"default cube");

 for(int i=0; i<360; i++)
 {
   cube.xzrot(1.0);
 	cube.draw();
   delay(10);
   cleardevice();
 }

 getch();




 closegraph();
}
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