GL N

/*
 * GLUT Shapes Demo
 *
 * Written by Nigel Stewart November 2003
 *
 * This program is test harness for the sphere, cone
 * and torus shapes in GLUT.
 *
 * Spinning wireframe and smooth shaded shapes are
 * displayed until the ESC or q key is pressed.  The
 * number of geometry stacks and slices can be adjusted
 * using the + and - keys.
 */

#include<windows.h>
#include <GL/glut.h>
#include<GL/gl.h>
//#include<windows.h>
#include <stdlib.h>
#include <stdio.h>

double Txval=0,Tyval=0,sval=0,rotat=0;
bool flagScale=true;
int windowWidth=1000,windowHeight=1000;

void rectangle()
{
    glBegin(GL_POLYGON);//Denotes the beginning of a group of vertices that define one or more primitives.
    glColor3f(0.0,1.0,0.0);
    glVertex2f(0.0,1.0);
    glColor3f(0.0,1.0,0.0);
    glVertex2f(2.0,1.0);
    glColor3f(1.0,0.0,0.0);
    glVertex2f(2.0,0.0);
    glColor3f(1.0,0.0,0.0);
    glVertex2f(0.0,0.0);
    glEnd();    //Terminates a list of vertices that specify a primitive initiated by glBegin.

}
void cube()
{
    glBegin(GL_QUADS);                // Begin drawing the color cube with 6 quads
    // Top face (y = 1.0f)
    // Define vertices in counter-clockwise (CCW) order with normal pointing out

  glColor3f(0.0f, 1.0f, 0.0f);     // Green
      glVertex3f( 1.0f, 1.0f, -1.0f);
      glVertex3f(-1.0f, 1.0f, -1.0f);
      glVertex3f(-1.0f, 1.0f,  1.0f);
      glVertex3f( 1.0f, 1.0f,  1.0f);

      // Bottom face (y = -1.0f)
      glColor3f(1.0f, 0.5f, 0.0f);     // Orange
      glVertex3f( 1.0f, -1.0f,  1.0f);
      glVertex3f(-1.0f, -1.0f,  1.0f);
      glVertex3f(-1.0f, -1.0f, -1.0f);
      glVertex3f( 1.0f, -1.0f, -1.0f);

      // Front face  (z = 1.0f)
      glColor3f(1.0f, 0.0f, 0.0f);     // Red
      glVertex3f( 1.0f,  1.0f, 1.0f);
      glVertex3f(-1.0f,  1.0f, 1.0f);
      glVertex3f(-1.0f, -1.0f, 1.0f);
      glVertex3f( 1.0f, -1.0f, 1.0f);

      // Back face (z = -1.0f)
      glColor3f(1.0f, 1.0f, 0.0f);     // Yellow
      glVertex3f( 1.0f, -1.0f, -1.0f);
      glVertex3f(-1.0f, -1.0f, -1.0f);
      glVertex3f(-1.0f,  1.0f, -1.0f);
      glVertex3f( 1.0f,  1.0f, -1.0f);

      // Left face (x = -1.0f)
      glColor3f(0.0f, 0.0f, 1.0f);     // Blue
      glVertex3f(-1.0f,  1.0f,  1.0f);
      glVertex3f(-1.0f,  1.0f, -1.0f);
      glVertex3f(-1.0f, -1.0f, -1.0f);
      glVertex3f(-1.0f, -1.0f,  1.0f);

      // Right face (x = 1.0f)
      glColor3f(1.0f, 0.0f, 1.0f);     // Magenta
      glVertex3f(1.0f,  1.0f, -1.0f);
      glVertex3f(1.0f,  1.0f,  1.0f);
      glVertex3f(1.0f, -1.0f,  1.0f);
      glVertex3f(1.0f, -1.0f, -1.0f);



    glEnd();

}
void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glMatrixMode( GL_PROJECTION );
    glLoadIdentity();
    glOrtho(-8, 8, -8, 8,-8,8);

    glMatrixMode( GL_MODELVIEW );
    glLoadIdentity();
    glRotated(45,0,1,0);
    glRotated(45,1,0,0);
    glRotatef(rotat,1,0,1);
    cube();
    glFlush();
    glutSwapBuffers();
}
void myKeyboardFunc( unsigned char key, int x, int y )
{
    switch ( key )
    {
    case 'r':
        Txval+=0.2;
        break;
    case 'l':
        Txval-=0.2;
        break;
    case 'u':
        Tyval+=0.2;
        break;
    case 'd':
        Tyval-=0.2;
        break;
    case 's':
        flagScale=true;
        break;
    case 'a':
        flagScale=false;
        break;
    case 27:    // Escape key
        exit(1);

    }
    glutPostRedisplay();
}


void animate()
{
    if (flagScale == true)
    {
        rotat+=1;
        if(rotat > 360)
            rotat = 0;
    }
    glutPostRedisplay();
}

int main (int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);

    glutInitWindowPosition(0,0);
    glutInitWindowSize(windowWidth,windowHeight);
    glutCreateWindow("Traingle-Demo");

    glShadeModel( GL_SMOOTH );
    glEnable( GL_DEPTH_TEST );
    glutDisplayFunc(display);
    glutKeyboardFunc(myKeyboardFunc);
    glutIdleFunc(animate);


    glutMainLoop();

    return 0;
}