Camera Movement in OPENGL

Hi Auqa,

Below is my code for creation of walls and apply texture to it.All the methods below in the class are used to create the walls in a polygon grid (10 X 10) format.And also create a ambient light for Day and Night effect.Now the only thing i need to do i put in a camera so that the user can move only inside the room.

Sorry for my silly question.As i am not programmer basically and i am working in networking feild.And this is the first time i am using C++ and opengl.


#ifndef WIN32
#define WIN32
#endif
#include <windows.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <iostream.h>


// included to enable using of images
#include "textureclass.cpp"
#include "Camera.h"

    Camera view;

    // The below 2 vriables are for the rotation
    static GLfloat spin = 0.0;
    int ifFound=0;

       // Variable to enable and disable night mode.
   // nightMode - false, enables global ambient
   // nightMode - true, disables global ambient
   static bool nightMode = false;

   GLUquadric* quad;

   float xtmp;


   // The viewing position of the camera
   static GLdouble xPos = 0.0;
   static GLdouble yPos = 0.0;  
   static GLdouble zPos = 5.0;

   // Texture Maps are declared
   static Texture_Image wall_bmp;
   static Texture_Image bathRug_bmp;
   static Texture_Image bathDoor_bmp;
   static Texture_Image bathwalls_bmp;
   static Texture_Image bathceiling_bmp;


void draw_backwall(void)
{
      // Store all the Values of the vertices x,y,z and the diffenrce between the
        // first and the consecutive polygon.
      float x= 0.978024;
        float y= 1.00523;
        float z = 0;
      float diffy = 0.197046;
      float diffx = 0.196046;
      

      
       for(int i=1;i<=10;i++)
      {
            x= 0.978024;
            for(int j=1;j<=10;j++)
            {
                  glBegin (GL_POLYGON);
                  glVertex3f(x,y,z);
                  glVertex3f(x,y-diffy,z);
                  glVertex3f(x-diffx,y-diffy,z);
                  glVertex3f(x-diffx,y,z);
                  glEnd();
                  x=x-diffx;
            }
                        y=y-diffy;
      }
            
}


void draw_ceilingwall(void)
{
      // Store all the Values of the vertices x,y,z and the diffenrce between the
        // first and the consecutive polygon.
      float x= -0.982438;
        float y= 1.005;
        float z =  0.206816;
      float diffz = 0.197046;
      float diffx = -0.196046;

                      glBindTexture( GL_TEXTURE_2D, bathceiling_bmp.Get_Texture() );
                      float fwidth, fheight;            
                        int width, height;
                        bathceiling_bmp.Get_Fraction_Used ( &fwidth, &fheight);
                        glEnable(GL_TEXTURE_2D);
      
       for(int i=1;i<=10;i++)
      {
            x= -0.982438;
            for(int j=1;j<=10;j++)
            {
                                    
                  glBegin (GL_POLYGON);
                  glTexCoord2f(1.0f, 0.0f); glVertex3f(x-diffx,y,z);
                  glTexCoord2f(1.0f, 1.0f); glVertex3f(x-diffx,y,z-diffz);
                  glTexCoord2f(0.0f, 1.0f); glVertex3f(x,y,z-diffz);
                  glTexCoord2f(0.0f, 0.0f); glVertex3f(x,y,z);
                  glEnd();
                  x=x-diffx;
      
            }
                        z=z+diffz;
      }
                  glDisable(GL_TEXTURE_2D);            
}


void draw_floorwall(void)
{
      // Store all the Values of the vertices x,y,z and the diffenrce between the
        // first and the consecutive polygon.
 
      float x= -0.786392;
        float y= -0.97277;
        float z = 1.765194;
      float diffz = 0.197046;
      float diffx = 0.196046;
      


       for(int i=1;i<=10;i++)
      {
                  glBindTexture( GL_TEXTURE_2D, wall_bmp.Get_Texture() );
                      float fwidth, fheight;            
                        int width, height;
                        wall_bmp.Get_Fraction_Used ( &fwidth, &fheight);
                        glEnable(GL_TEXTURE_2D);      
            x= -0.786392;
            for(int j=1;j<=10;j++)
            {
                                    
                  glBegin (GL_POLYGON);
                  glTexCoord2f(1.0f, 0.0f); glVertex3f(x,y,z);
                  glTexCoord2f(1.0f, 1.0f); glVertex3f(x,y,z+diffz);
                  glTexCoord2f(0.0f, 1.0f); glVertex3f(x-diffx,y,z+diffz);
                  glTexCoord2f(0.0f, 0.0f); glVertex3f(x-diffx,y,z);
                  glEnd();
                  x=x+diffx;
      
            }
                        z=z-diffz;
            
      }
                  glDisable(GL_TEXTURE_2D);                  
}



void draw_rightwall(void)
{
      // Store all the Values of the vertices x,y,z and the diffenrce between the
        // first and the consecutive polygon.
   
      float x= 0.979804;
        float y= -0.768184;
        float z = 1.76026;
      float diffy = 0.197046;
      float diffz = -0.19605;
      
      glBindTexture( GL_TEXTURE_2D, bathwalls_bmp.Get_Texture() );
          float fwidth, fheight;
            int width, height;
            bathwalls_bmp.Get_Fraction_Used ( &fwidth, &fheight);
      glEnable(GL_TEXTURE_2D);
      
       for(int i=1;i<=10;i++)
      {
            z= 1.76026;
            for(int j=1;j<=10;j++)
            {
                                    
                  glBegin (GL_POLYGON);
                  glTexCoord2f(1.0f, 0.0f); glVertex3f(x,y,z);
                  glTexCoord2f(1.0f, 1.0f); glVertex3f(x,y-diffy,z);
                  glTexCoord2f(0.0f, 1.0f); glVertex3f(x,y-diffy,z-diffz);
                  glTexCoord2f(0.0f, 0.0f); glVertex3f(x,y,z-diffz);
                  glEnd();
                  z=z+diffz;
      
            }
                        y=y+diffy;
                  
      }
                  glDisable(GL_TEXTURE_2D);
}

void draw_leftwall(void)
{
      // Store all the Values of the vertices x,y,z and the diffenrce between the
        // first and the consecutive polygon.

      glBindTexture( GL_TEXTURE_2D, bathwalls_bmp.Get_Texture() );
          float fwidth, fheight;
            int width, height;
            bathwalls_bmp.Get_Fraction_Used ( &fwidth, &fheight);
      glEnable(GL_TEXTURE_2D);
 
   
      float x= -0.990528;
        float y= 1.00523;
        float z = -0.0160207;
      float diffy = 0.197046;
      float diffz = -0.1960457;
      
       for(int i=1;i<=10;i++)
      {
            z= -0.0160207;
            for(int j=1;j<=10;j++)
            {
                                    
                  glBegin (GL_POLYGON);
                  glTexCoord2f(1.0f, 0.0f); glVertex3f(x,y,z);
                  glTexCoord2f(1.0f, 1.0f); glVertex3f(x,y-diffy,z);
                  glTexCoord2f(0.0f, 1.0f); glVertex3f(x,y-diffy,z-diffz);
                  glTexCoord2f(0.0f, 0.0f); glVertex3f(x,y,z-diffz);
                  glEnd();
                  z=z-diffz;
      
            }
                        y=y-diffy;
      }
      glDisable(GL_TEXTURE_2D);
}

void draw_mat(void)
{

                        glBindTexture( GL_TEXTURE_2D, bathRug_bmp.Get_Texture() );
          float fwidth, fheight;
            int width, height;
            bathRug_bmp.Get_Fraction_Used ( &fwidth, &fheight);
                  glEnable(GL_TEXTURE_2D);
                  glBegin (GL_POLYGON);
                  glTexCoord2f(1.0f, 0.0f); glVertex3f(0.41,-0.96,0.05);
                  glTexCoord2f(1.0f, 1.0f); glVertex3f(0.95,-0.96,0.05);
                  glTexCoord2f(0.0f, 1.0f); glVertex3f(0.95,-0.96,0.38);
                  glTexCoord2f(0.0f, 0.0f); glVertex3f(0.41,-0.96,0.38);
                  glEnd();
                  glDisable(GL_TEXTURE_2D);
}

void draw_door(void)
{

                        glBindTexture( GL_TEXTURE_2D, bathDoor_bmp.Get_Texture() );
                            float fwidth, fheight;
                              int width, height;
                              bathDoor_bmp.Get_Fraction_Used ( &fwidth, &fheight);
                              glEnable(GL_TEXTURE_2D);
                  glBegin (GL_POLYGON);
                  glTexCoord2f(1.0f, 0.0f); glVertex3f(0.25,0.86,0.01);
                  glTexCoord2f(1.0f, 1.0f); glVertex3f(0.95,0.86,0.01);
                  glTexCoord2f(0.0f, 1.0f); glVertex3f(0.95,-0.96,0.01);
                  glTexCoord2f(0.0f, 0.0f); glVertex3f(0.25,-0.96,0.01);
                  glEnd();
                  glDisable(GL_TEXTURE_2D);
}

// method to setup the lighting
   void set_light ( void)
   {


        // controlling the ambient light
        GLfloat ambientVal;
        if(!nightMode)
              ambientVal = 2.0;
        else
                ambientVal = 0.2;

        GLfloat lmodel_ambient[] = {ambientVal,ambientVal,ambientVal, 1.0 };
        glClearColor(0.0,0.0,0.0,1.0);
        glShadeModel(GL_SMOOTH);

      // enable ambient light
        glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);

            glLightModeli ( GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE );
      glLightModeli ( GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE );

       // enable all the lighting
        glEnable ( GL_LIGHTING ); // ambient
        glEnable (GL_DEPTH_TEST);
        glEnable(GL_COLOR_MATERIAL); // to enable proper transparency and color after the lighting
   }

void control(unsigned char key, int x, int y){
               Camera temp(view);
               Point a;
               
               //Point blah = temp.getLooking();
               switch(key){
                    //Strafe Left
                    case '7':
                         temp.strafe(1);
                         a.copy(temp.getLooking());
                         
                         break;
                    //Strafe Right
                    case '9':
                         temp.strafe(-1);
                         a.copy(temp.getLooking());
                         
                         break;
                    //Look up
                    case '8':
                         temp.pitch(1);
                         a.copy(temp.getLooking());              
                         break;
                    //Look down
                    case '5':
                         temp.pitch(-1);
                         a.copy(temp.getLooking());
                         break;
                    //Turn left
                    case '4':
                         temp.turn(1);
                         a.copy(temp.getLooking());
                         break;
                    //Turn right
                    case '6':
                         temp.turn(-1);
                         a.copy(temp.getLooking());
                         break;
                    //Move foreward
                    case '0':
                         temp.walk(1);
                         a.copy(temp.getLooking());
                         break;
                    //Move backward
                    case '1':
                         temp.walk(-1);
                         a.copy(temp.getLooking());
                         break;
                    case 'q':
                         temp.altitude(1);
                         break;
                    case 'a':
                         temp.altitude(-1);
                         break;
                    default:
                         break;
             }

                    bool x1 = false;
                temp.atLoc.setY(Collision::checkScene(temp.getAt()));
                    view.upd(temp,a,x1);
                    view.setStatic();
             glutPostRedisplay();
          }



void init(void)
{
     //glClearColor (.5,1,1,1); // Black is the Background
     glShadeModel (GL_SMOOTH); // The Shade Model is smooth , to create the reality.

      glClearColor (1,1,1, 1.0);
      glClearDepth (1.0);

     // set all the textures
      wall_bmp.Make_Std_Texture("wall_back.bmp",true,GL_BLEND);
      bathRug_bmp.Make_Std_Texture("bath_rug.bmp",true,GL_DECAL);
      bathDoor_bmp.Make_Std_Texture("bath_door.bmp",true,GL_DECAL);
      bathwalls_bmp.Make_Std_Texture("bath_walls.bmp",true,GL_DECAL);
      bathceiling_bmp.Make_Std_Texture("bath_walls.bmp",true,GL_DECAL);

      glShadeModel (GL_FLAT);
      quad = gluNewQuadric();
      glShadeModel (GL_SMOOTH);
}


void display(void)
{
      
     set_light(); // Call the light
      // clear colour and depth buffer(window)
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
      glLoadIdentity();
      glPushMatrix();
         

      // current position of viewer x,y,z
       gluLookAt ( xPos, yPos, zPos, 0., 0., 0., 0., 1.0, 0. );


      // Enabling depth testing
      glEnable (GL_DEPTH_TEST);
      
      
            glScalef(1.55,1.55,1.55);
      // Draw the Back Wall
      draw_backwall();

      // Draw the roof of the room.
      draw_ceilingwall();

      // Draw the floor of the wall
      draw_floorwall();

      // Draw the right Wall
      draw_rightwall();

      
        // Draw the left Wall
      draw_leftwall();
      
      // Draw the mat at the entrance
      draw_mat();
      
      // Draw the door the bathrroom
      draw_door();

   glutSwapBuffers();

}

   void reshape(int width, int height)
   {


           // Viewport is set to the same size of the window.
      glViewport (0, 0, (GLsizei) width, (GLsizei) height);

           // Sets the Matrix mode to Projection
      glMatrixMode(GL_PROJECTION);

      glLoadIdentity();

           // Program uses a perspective projection
      // Parameters: field of view (in angle degrees), aspect ratio, distance to near clipping plane,
      // distance to far cutoff plane

      gluPerspective(75.0, 1.0, 0.5, 1500.0);

           // Sets the Matrix mode to Modelview
      glMatrixMode(GL_MODELVIEW);
      glLoadIdentity();

   }


   
  void keyboard(unsigned char key, int x, int y)
  {
      switch (key) {

       case 'o':
          nightMode = false;
          break;

       case 'O':
          nightMode = true;
          break;

           default:
            return;
            break;
       }
          glutPostRedisplay ();
  }

   int main(int argc, char** argv)
   {
      glutInit(&argc, argv);
      glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);            //set up window (double buffering, colour setup)
      glutInitWindowSize (700, 700);            // Set initial window size to 700 x 700
      glutInitWindowPosition (10, 10);      // Set initial window position of project
      glutCreateWindow (argv[0]);            // Create the application window

      init();

      glutDisplayFunc(display);

      glutKeyboardFunc(keyboard);
      glutReshapeFunc(reshape);

      glutMainLoop();
      return 0;
   }


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