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3d rotating cube in c++

Posted on 2006-07-14
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How can i make a 3D cube in C++ and  also  rotate it .. using Turbo C++ 3.0
No VC++ or OpenGL or DirectX please..
I want to make it in simple C++
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Question by:shilpi84
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Expert Comment

by:InteractiveMind
ID: 17109895
Are you happy to use GDI/+ for this? Or do you wish to incorporate even your own line/polygon rendering?

How is your math?
You're going to need to be familiar with vectors, matrices, and projections for this.
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by:shilpi84
ID: 17110255
i m familiar with  matrices and projections!the problem is i m not able 2 put my knowledge 2 make a program.dont know how 2 start:(
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Expert Comment

by:InteractiveMind
ID: 17110370
What problem(s) are you having with this, specifically?

How confident are you with C++?
Is your OOP any good?
Have you learnt to multi-thread in C++?
Are you able to use GDI/+ (which you could use for 2D rendering to the screen)?
  If so, then have you learnt any of this before?
Have you figured out how to represent and manipulate the 3D cube programmatically?
And..Do you wish to incorporate some form of lighting into this?
  If so, then are you happy with how exactly you would do this?

Anything else..?
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Author Comment

by:shilpi84
ID: 17110519
>>How confident are you with C++?

on a scale of 10 i wud give my self 6Have you learnt to multi-thread in C++?.

Is your OOP any good?

i m quiet familiar with oop concepts.

Have you learnt to multi-thread in C++?.

nope but i know multithreading of java.i just took its lesson.

About representing the cube i know how 2 project 3d coordinates onto 2d plane.i reffered baker 4 the rotation and other transformation matrices.
i dont want ne special effects in my cube no lightting and all.actually i m trying 2 make a rotating dice 4 my game.

and plz dont say that u wont be able 2 help me remember u helped me a lot in getting through infosys(puzzles).i really want 2 make this.
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Expert Comment

by:InteractiveMind
ID: 17110791
Why not use Java for this (at least, for now) ?
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Expert Comment

by:InteractiveMind
ID: 17110795
(It's entirely up to you... it would just be easier if you learnt to do this sort of thing in a more familiar environment, and then perhaps ported it to C++ at a later stage?)
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Expert Comment

by:jagadeesh_motamarri
ID: 17110965
/****************************************************************************\
*                                                                            *
*  Cube.cpp                                                                  *
*  CubeU.cpp                                                                 *
*                                                                            *
*  This program draws a cube in 3D world space and allows the user to move   *
*  and rotate the cube through keyboard controls. Each of the six cube faces *
*  is a different color.                                                     *
*                                                                            *
\****************************************************************************/
#include
#pragma hdrstop
#include "CubeU.h"
//---------------------------------------------------------------------------
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
   : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::OnIdle(TObject *Sender, bool &Done)
{
   CheckForMovement();
   Done = False;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormActivate(TObject *Sender)
{
   fg_realize(hPal);
   Invalidate();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormCreate(TObject *Sender)
{
   hDC = GetDC(Form1->Handle);
   fg_setdc(hDC);
   hPal = fg_defpal();
   fg_realize(hPal);
   fg_vbinit();
   vbDepth = fg_colors();
   fg_vbdepth(vbDepth);
   hVB = fg_vballoc(vbWidth,vbHeight);
   fg_vbopen(hVB);
   fg_vbcolors();
   fg_setcolor(-1);
   fg_fillpage();
   fg_3Dviewport(0,vbWidth-1,0,vbHeight-1,0.5);
   fg_3Drenderstate(FG_ZCLIP);
   Application->OnActivate = OnActivate;
   Application->OnIdle = OnIdle;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormPaint(TObject *Sender)
{
   fg_vbscale(0,vbWidth-1,0,vbHeight-1,0,cxClient-1,0,cyClient-1);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormResize(TObject *Sender)
{
   cxClient = ClientWidth;
   cyClient = ClientHeight;
   Invalidate();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormDestroy(TObject *Sender)
{
   fg_vbclose();
   fg_vbfree(hVB);
   fg_vbfin();
   DeleteObject(hPal);
   ReleaseDC(Form1->Handle,hDC);
}
/****************************************************************************\
*                                                                            *
*  CheckForMovement()                                                        *
*                                                                            *
*  The CheckForMovement() function checks for key presses that control the   *
*  cube's movement, and if required redraws the cube at its new position and *
*  orientation. It is called from the application's OnIdle event handler.    *
*                                                                            *
\****************************************************************************/
void __fastcall TForm1::CheckForMovement()
{
   static double xWorld = 0.0, yWorld = 0.0, zWorld = 100.0;
   static int xAngle = 0, yAngle = 0, zAngle = 0;
   static bool Redraw = True;
   bool ShiftKey;
   // check if either shift key is pressed
   ShiftKey = fg_kbtest(42) | fg_kbtest(54);
   // + and - move cube along the z axis (+ is toward viewer, - is
   // away from viewer)
   if (fg_kbtest(74))
   {
      zWorld += 3.0;
      Redraw = True;
   }
   else if (fg_kbtest(78))
   {
      zWorld -= 3.0;
      Redraw = True;
   }
   // left and right arrow keys move cube along x axis
   else if (fg_kbtest(75))
   {
      xWorld -= 3.0;
      Redraw = True;
   }
   else if (fg_kbtest(77))
   {
      xWorld += 3.0;
      Redraw = True;
   }
   // up and down arrow keys move cube along y axis
   else if (fg_kbtest(72))
   {
      yWorld += 3.0;
      Redraw = True;
   }
   else if (fg_kbtest(80))
   {
      yWorld -= 3.0;
      Redraw = True;
   }
   // x rotates counterclockwise around x axis, X rotates clockwise
   else if (fg_kbtest(45))
   {
      if (ShiftKey)
      {
         xAngle += 6;
         if (xAngle >= 360) xAngle -= 360;
      }
      else
      {
         xAngle -= 6;
         if (xAngle < 0) xAngle += 360;
      }
      Redraw = True;
   }
   // y rotates counterclockwise around y axis, Y rotates clockwise
   else if (fg_kbtest(21))
   {
      if (ShiftKey)
      {
         yAngle += 6;
         if (yAngle >= 360) yAngle -= 360;
      }
      else
      {
         yAngle -= 6;
         if (yAngle < 0) yAngle += 360;
      }
      Redraw = True;
   }
   // z rotates counterclockwise around z axis, Z rotates clockwise
   else if (fg_kbtest(44))
   {
      if (ShiftKey)
      {
         zAngle += 6;
         if (zAngle >= 360) zAngle -= 360;
      }
      else
      {
         zAngle -= 6;
         if (zAngle < 0) zAngle += 360;
      }
      Redraw = True;
   }
   // if the cube's position or rotation changed, redraw the cube
   if (Redraw)
   {
      // erase the previous frame from the virtual buffer
      fg_setcolor(-1);
      fg_fillpage();
      // define the cube's new position and rotation in 3D world space
      fg_3Dsetobject(xWorld,yWorld,zWorld,xAngle*10,yAngle*10,zAngle*10);
      // draw the cube
      DrawCube();
      // display what we just drew
      fg_vbscale(0,vbWidth-1,0,vbHeight-1,0,cxClient-1,0,cyClient-1);
      Redraw = False;
   }
}
/****************************************************************************\
*                                                                            *
*  DrawCube()                                                                *
*                                                                            *
*  Draws each of the six cube faces in 3D world space.                       *
*                                                                            *
\****************************************************************************/
void __fastcall TForm1::DrawCube()
{
   register int i;
   int r, g, b;
   static int Colors[] = {84,88,92,96,100,104};
   for (i = 0; i < 6; i++)
   {
      if (vbDepth > 8)
      {
         fg_getrgb(Colors[i],&r,&g,&b);
         fg_setcolorrgb(r,g,b);
      }
      else
      {
         fg_setcolor(Colors[i]);
      }
      fg_3Dpolygonobject((double *)Faces[i],4);
   }
}


Source: http://www.fastgraph.com/help/cube_builder.html
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Author Comment

by:shilpi84
ID: 17111064
InteractiveMind, I think you have a valid point .. i'll make a static cube only..
I got some codes from various sites but i wanted to understand it..
I've made a Snakes n Ladders game in c++ so i'm not going to restart it in Java ..

And how tough is OpenGL/DirectX? And if i start reading tutorials(from d net), abt how long will it take?
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Author Comment

by:shilpi84
ID: 17111067
Which is better DirectX or OpenGL and especially easier to learn
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Accepted Solution

by:
InteractiveMind earned 500 total points
ID: 17111196
Many people (including myself) prefer OpenGL to DirectX.
I found OpenGL a lot easier to learn.

If you check out the NeHe tutorials (on OpenGL), then you could perhaps get something working by tonight:
http://nehe.gamedev.net/


[[ But nothing beats a good book! ]]
      (The OpenGL Red Book!!)
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