// Computer Graphics - Amir Hesami
// This program is showing how to draw 
// points with different colors using a keyboard
// and quit with ctrl-c 
// keyboard 1.cpp


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

#pragma comment(lib, "opengl32.lib")  // Link OpenGL32.lib
#pragma comment(lib, "glu32.lib")	  // Link Glu32.lib
#pragma comment(lib, "glut32.lib")    // Link Glut32.lib
#pragma comment(linker, "/entry:\"mainCRTStartup\"" )  // set the entry point to be main()
#pragma comment(linker, "/subsystem:\"Windows\"" )  // set the entry point to be main()


const int screenWidth=640;
const int screenHeight=480;
static int color;

class point{
public:
	GLint x,y;
};


void display(void);
void init(void);
void drawpoint(GLint x,GLint y);
void bigdipper(void);
void keyboard(unsigned char key, int x, int y);
void special(int,int,int);
void reshape(int ww, int wh);

int main(int argc, char** argv)
{
	glutInit(&argc, argv); //initialize the toolkit
	glutInitDisplayMode( GLUT_SINGLE | GLUT_RGB); //set display mode
	glutInitWindowSize(screenWidth, screenHeight); // set window size
	glutInitWindowPosition(50,50); //set window position
	glutCreateWindow("Keyboard: R:Red, G:Green, B:Blue, Q:Quit F1: Quit"); // create the window
	
	
	init();
	glutDisplayFunc(display); // register redraw function
	glutKeyboardFunc(keyboard);//register keyboard events
	glutSpecialFunc(special);//register special keys
	glutReshapeFunc(reshape);
	glutMainLoop(); // go into the loop
	return 0;
}

void init(void)
{
	glClear(GL_COLOR_BUFFER_BIT); //clear the screen
	glClearColor(1.0, 1.0, 1.0, 1.0); //set background color
    glPointSize(4.0); // set the size of the points
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D(0.0, float(screenWidth), 0.0, float(screenHeight));
}

void display(void)
{
	
}

void reshape(int ww, int wh)
{  
	
    glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D(0.0, float(screenWidth), 0.0, float(screenHeight));
    glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	glViewport(0,0,ww, wh);
	glClearColor(1.0,1.0,1.0,1.0);
    glClear(GL_COLOR_BUFFER_BIT);
	glFlush();
}

void drawpoint(GLint x,GLint y)
{
	glBegin(GL_POINTS);
	   glVertex2i(x,y);
	glEnd();
	glFlush();
}

void bigdipper(void)
{
	
	point p[8]={{289,190},
	{320,128},
	{239,67},
	{194,101},
	{129,83},
	{75,73},
	{74,74},
	{20,10}};
	for(int i=0;i<8;i++)
		drawpoint(p[i].x,p[i].y);
}

void keyboard(unsigned char key, int x, int y)
{
	
	switch(key){
	case 'R': 
	case 'r':glColor3f(1.0, 0.0, 0.0);
		     bigdipper();
		     break;
	case 'G': 
	case 'g':glColor3f(0.0, 1.0, 0.0);
             bigdipper();
		     break;
	case 'B': 
	case 'b':glColor3f(0.0, 0.0, 1.0);
             bigdipper();
		     break;
    
	case 'Q':
	case 'q':exit(0);
		    break;
	default:break;
	}
}


void special(int key, int x, int y)
{
	
	
	if(key==GLUT_KEY_F1) exit(0);
}