/*************************************************************************

 PROBLEM STATEMENT - 
ANIMATION:
Implement Animation (Moving Car) Assignment

*************************************************************************/


#include <GL/freeglut.h>
#include<GL/glut.h>

int frame1=0;

void Init()
{
glClearColor(0.6,0.9,1,0);
gluOrtho2D(0,640,0,480);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
}

void car()
{
glColor3f(0.8,0.8,0.8);
glBegin(GL_POLYGON);
glVertex2d(20,160);
glVertex2d(20,200);
glVertex2d(100,200);
glVertex2d(120,180);
glVertex2d(120,160);
glEnd();

glColor3f(0,0,0);
glBegin(GL_LINE_LOOP);
glVertex2d(80,200);
glVertex2d(80,180);
glVertex2d(120,180);
glVertex2d(100,200);
glEnd();

glBegin(GL_LINE_LOOP);
glVertex2d(20,160);
glVertex2d(20,200);
glVertex2d(100,200);
glVertex2d(120,180);
glVertex2d(120,160);
glEnd();

glColor3f(0,0,0); //wheels
glPushMatrix();
glTranslated(30,160,0);
glutWireSphere(5,110,110);
glPopMatrix();
glPushMatrix();
glTranslated(110,160,0);
glutWireSphere(5,110,110);
glPopMatrix();
glFlush();
}

void doframe(int v)
{
frame1++;
glutPostRedisplay();
glutTimerFunc(20,doframe,0);
}

void Display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//glColor3f(0,0.75,0);
glColor3f(0.5f,0.35f,0.05f);
glBegin(GL_TRIANGLES); //mountains
glVertex2d(0,300);
glVertex2d(75,350);
glVertex2d(150,300);

glVertex2d(140,300);
glVertex2d(230,350);
glVertex2d(300,300);

glVertex2d(340,300);
glVertex2d(415,350);
glVertex2d(490,300);

glVertex2d(480,300);
glVertex2d(570,350);
glVertex2d(640,300);
glEnd();

glColor3f(0.5,1,0.5); //surface
glBegin(GL_POLYGON);
glVertex2d(0,0);
glVertex2d(0,300);
glVertex2d(640,300);
glVertex2d(640,0);
glEnd();

glColor3f(0,1,1); //river
glBegin(GL_POLYGON);
glVertex2d(220,0);
glVertex2d(300,300);
glVertex2d(340,300);
glVertex2d(400,0);
glEnd();

glColor3f(0.5,0.5,0.5); //road
glBegin(GL_POLYGON);
glVertex2d(0,120);
glVertex2d(0,160);
glVertex2d(640,160);
glVertex2d(640,120);
glEnd();

glColor3f(1,0,0.5); //Building
glBegin(GL_POLYGON);
glVertex2d(10,160);
glVertex2d(10,260);
glVertex2d(45,300);
glVertex2d(80,260);
glVertex2d(80,160);
glEnd();
glColor3f(1,1,1);
glBegin(GL_LINES);
glVertex2d(45,220);
glVertex2d(45,240);
glEnd();

glPushMatrix();    //Move car from left to right
glTranslated((frame1 % 640),0,0);
car();
glPopMatrix();
glFlush();
}

int main(int argc,char **argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowPosition(0,0);
glutInitWindowSize(800,600);
glutCreateWindow("ANIMATION - MOVING CAR");
Init();
glutDisplayFunc(Display);
glutTimerFunc(100,doframe,0);
glutMainLoop();
}