bus

#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include <windows.h>
#include <glut.h>
#define pi (2*acos(0.0))

int x;
double angle;
double incx=0, incy;
int state;
double points;

struct point
{
    double x,y,z;
};
void draw_tri()
{
    glBegin(GL_POLYGON);
        glVertex2f(10, 10);
        glVertex2f(10, 0);
        glVertex2f(-10, 0);
    glEnd();
}
void push_pop(void)
{
    glPushMatrix();
        //glRotatef(45, 0, 0, 1);
        glPushMatrix(); // Furthest Triangle, Draw first
            //glRotatef(45, 0, 0, 1);
            glTranslatef(-20, 0, 0);
            glScaled(0.5, 2, 0);
            glColor3f(0.0, 0.0, 1.0);
            draw_tri();

        glPopMatrix();
        glPushMatrix(); // Middle Triangle, Draw 2nd
            glColor3f(0.0, 1.0, 0.0);
            draw_tri();
        glPopMatrix();

        glPushMatrix(); // Nearest Triangle, Draw last
            glTranslatef(20, 0, 0);
            glColor3f(1.0, 0.0, 0.0);
            draw_tri();
        glPopMatrix();

    glPopMatrix();

}


void drawAxes()
{

    glColor3f(1.0, 1.0, 1.0);
    glBegin(GL_LINES);{
        glVertex3f( 100,0,0);
        glVertex3f(-100,0,0);

        glVertex3f(0,-100,0);
        glVertex3f(0, 100,0);

        glVertex3f(0,0, 100);
        glVertex3f(0,0,-100);
    }glEnd();

}


void drawGrid()
{
    int i;

    glColor3f(0.6, 0.6, 0.6);   //grey
    glBegin(GL_LINES);{
        for(i=-8;i<=8;i++){

            if(i==0)
                continue;   //SKIP the MAIN axes

            //lines parallel to Y-axis
            glVertex3f(i*10, -90, 0);
            glVertex3f(i*10,  90, 0);

            //lines parallel to X-axis
            glVertex3f(-90, i*10, 0);
            glVertex3f( 90, i*10, 0);
        }
    }glEnd();

}

void drawSquare(double a)
{
    //glColor3f(1.0,0.0,0.0);
    glBegin(GL_QUADS);{
        glVertex3f( a, a,0);
        glVertex3f( a,-a,0);
        glVertex3f(-a,-a,0);
        glVertex3f(-a, a,0);
    }glEnd();
}

void rec_animation()
{
    glColor3f(0,1,0);
    //glRotatef(5*angle,0,0,1);
    glTranslatef(incx,incy,0);
    glRotatef(5*angle,0,0,1);
    drawSquare(5);

}
void draw_rec()
{

    drawSquare(1);

}

void simple_trans()
{
    glPushMatrix();
        glPushMatrix();
            glRotatef(10*angle, 0, 0, 1);
            //glTranslatef(20, 0, 0);
            glColor3f(1.0, 1.0, 1.0);
            draw_rec();
        glPopMatrix();



        glRotatef(angle, 0, 0, 1);
        glTranslatef(20, 0, 0);
        glRotatef(angle, 0, 0, 1);

        glColor3f(0.0, 0.0, 1.0);

        draw_rec();
    glPopMatrix();
}

/*
You will implement the following function to produce the simulation in the video.

*/
void body()
{
    //rectangle
    glBegin(GL_QUADS);{
        glVertex3f( 30, 10,0);
        glVertex3f( 30,-10,0);
        glVertex3f(-30,-10,0);
        glVertex3f(-30, 10,0);
    }glEnd();
}
void cycle()
{
    //tire
    glBegin(GL_QUADS);{
        glVertex3f( 10, 2,0);
        glVertex3f( 10,-2,0);
        glVertex3f(-10,-2,0);
        glVertex3f(-10, 2,0);
    }glEnd();
    glBegin(GL_QUADS);{
        glVertex3f( 2, 10,0);
        glVertex3f( 2,-10,0);
        glVertex3f(-2,-10,0);
        glVertex3f(-2, 10,0);
    }glEnd();
}
void BusMove_Assignment()
{
    glPushMatrix();
    glTranslatef(incx,incy,0);

    glPushMatrix();
    glRotatef(angle,0,0,1);
    glColor3f(0,0,1);
    cycle();
    glPopMatrix();

    glPushMatrix();
    glTranslatef(30,0,0);
    glRotatef(angle,0,0,1);
    glColor3f(0,1,0);
    cycle();
    glPopMatrix();

    glPushMatrix();
    glTranslatef(15,10,0);  //<--
    glColor3f(1,0,0);
    body();
    glPopMatrix();
    glPopMatrix();
}

void display(){

    //clear the display
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glClearColor(0,0,0,0);  //color black
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);



    glMatrixMode(GL_MODELVIEW);


    glLoadIdentity();


    gluLookAt(0,0,70,   0,0,0,  0,1,0);



    glMatrixMode(GL_MODELVIEW);

    BusMove_Assignment();

    drawAxes();
    drawGrid();
    //BusMove_Assignment();





    //ADD this line in the end --- if you use double buffer (i.e. GL_DOUBLE)
    glutSwapBuffers();
}


void animate(){
    //rotation
    angle-=0.1; //speed of rotation
    incx+=0.01;
    points+=0.005;

    glutPostRedisplay();
}

void init(){
    //codes for initialization
    angle=0;

    //clear the screen
    glClearColor(0,0,0,0);


    //load the PROJECTION matrix
    glMatrixMode(GL_PROJECTION);

    //initialize the matrix
    glLoadIdentity();

    //give PERSPECTIVE parameters
    gluPerspective(80,  1,  1,  1000.0);

}

int main(int argc, char **argv){
    glutInit(&argc,argv);
    glutInitWindowSize(500, 500);
    glutInitWindowPosition(0, 0);
    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGB);   //Depth, Double buffer, RGB color

    glutCreateWindow("My OpenGL Program");

    init();

    glEnable(GL_DEPTH_TEST);    //enable Depth Testing

    glutDisplayFunc(display);   //display callback function
    glutIdleFunc(animate);      //what you want to do in the idle time (when no drawing is occuring)

    //glutKeyboardFunc(keyboardListener);
    //glutSpecialFunc(specialKeyListener);
    //glutMouseFunc(mouseListener);

    glutMainLoop();     //The main loop of OpenGL

    return 0;
}