#include <stdlib.h>
#include <GL/glut.h>
#include <stdio.h>  // need for function Output
#include <stdarg.h> // need for function Output



float ww=500,wh=500;
float xoffset1=0.0;
float deltax1=0.01;
float xoffset2=0.0;
float deltax2=0.01;



void Output(GLfloat x, GLfloat y, char *format,...)
{
	va_list args;
	char buffer[200], *p;

	va_start(args,format);
	vsprintf( buffer,format,args);
	va_end(args);
	glRasterPos2f(x,y);
	for (p=buffer ; *p ; p++)
		glutBitmapCharacter(GLUT_BITMAP_9_BY_15, *p);
}




void display(void)
{
 
// pick a background color

    glClearColor(1.0f,0.9f,1.0f,1.0f);

// clear screen
    glClear(GL_COLOR_BUFFER_BIT);

    
    
 
  
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();

 

   glColor3f(0.8,0.9,0.9);
   glRectf(0,19,2,20);
   glColor3f(0.0,0.0,0.0);
   Output(0,19.5,"START");

   glColor3f(0.9,0.8,0.9);
   glRectf(0,17.5,2,18.5);
   glColor3f(0.0,0.0,0.0);
   Output(0,18.5,"STOP");

   //WINNER
   //Need a way to check which car is winner.
   //And print it on the screen
   
   glColor3f(0.9,0.8,0.9);
   glRectf(0,16,2,17);
   glColor3f(0.0,0.0,0.0);
   Output(0,16.5,"WINNER");


//draw 2-d objects
//car1

  
     glTranslatef(xoffset1,0,0.0);
     glNormal3f(0.0,0.0,1.0);
	 glColor3f(1.0,1.0,0.7);
	 
	 glBegin(GL_POLYGON);
	      glVertex2f(0,6.0);
		  glVertex2f(3.0,6.0);
		  glVertex2f(3.0,6.4);
		  glVertex2f(2.2,6.4);
		  glVertex2f(2.0,6.8);
		  glVertex2f(1.0,6.8);
		  glVertex2f(0.6,6.4);
		  glVertex2f(0.2,6.4);
		  glVertex2f(0.1,6.4);
		  glVertex2f(0.0,6.0);
		  
	 glEnd();
	 
     glTranslatef(-xoffset1,0.0,0.0);


 
	 
//car2

	 glTranslatef(xoffset2,0,0.0);
     glNormal3f(0.0,0.0,1.0);
	 
	 glColor3f(1.0,0.7,1.0);
	 glBegin(GL_POLYGON);
	      glVertex2f(0,8.0);
		  glVertex2f(3.0,8.0);
		  glVertex2f(3.0,8.4);
		  glVertex2f(2.2,8.4);
		  glVertex2f(2.0,8.8);
		  glVertex2f(1.0,8.8);
		  glVertex2f(0.6,8.4);
		  glVertex2f(0.2,8.4);
		  glVertex2f(0.1,8.4);
		  glVertex2f(0.0,8.0);
		  
	 glEnd();
	 
     glTranslatef(-xoffset2,0.0,0.0);


 
	 

     
     
     
glutSwapBuffers();
glFlush();

}



void Reshape(int w, int h)
{
  
    glViewport(0, 0, w, h);

// use orthographic  projection 

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0.0,20.0,0.0,20.0,-1.0,1.0);
	ww=w;wh=h;

 
}

void mouse(int button,int state,int x,int y)  
{ 
   
	if (button==GLUT_LEFT_BUTTON  &
		( (x<0.10*wh) & (y<0.05*wh))) {
		deltax1=0.1;
		deltax2=0.2;
	}
	else if (button==GLUT_LEFT_BUTTON  &
		( (x<0.10*wh) & (y<0.12*wh) & (y>0.07*wh))) 
		 {
		deltax1=0.0;
		deltax2=0.0
	}

		//winner method : if left click then car1 iis winner
         // else if right click then car2 is winner.  i want
        //this to be printed out on the screen but since this
        //is not in the display function it won't show up


	else if (button==GLUT_LEFT_BUTTON  &
		( (x<0.10*wh) & (y<0.19*wh) & (y>0.14*wh))) 
		 {
		deltax1 = .4;
		glColor3f(0.6, 0.9, 0.6);
		Output(10,20,"Winner");
	}

	else if (button==GLUT_RIGHT_BUTTON  &
		( (x<0.10*wh) & (y<0.19*wh) & (y>0.14*wh))) 
		 {
		deltax1=0.0;
		deltax2=0.0
	}

	glutPostRedisplay();
	
}

void vrooom()  
{ 

	
    
    xoffset1 = xoffset1+deltax1;
	if  (xoffset1>20.0) { xoffset1=0;xoffset2=xoffset2-20.0;}
	else if (xoffset2>20.0) {xoffset2=0;xoffset1=xoffset1-20.0;}
	xoffset2 = xoffset2+deltax2;
	  
	glutPostRedisplay();
	
}



void main(int argc, char **argv)
{
    glutInit(&argc, argv);
//create window
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
    glutInitWindowSize(600, 600);
    glutCreateWindow("races");

//register callback functions
    glutReshapeFunc(Reshape);
    glutDisplayFunc(display);
    glutIdleFunc(vrooom);
  	glutMouseFunc(mouse);
	
	


//enter event loop
    glutMainLoop();
}