// Computer Graphics - Amir Hesami
// This program shows how to draw different shapes of polygons
//polygonstipples.cpp

#include <GL/glut.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()
void display();

void init( );

int main(int argc, char** argv)
{
	//Initialize glut and specifies command line options
	glutInit(&argc, argv);

	//Initializes opreation's mode and coloring system
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    
	//Specifying the window's size
	glutInitWindowSize(500,500);
    
	//Specifying the window's position
	glutInitWindowPosition(100,100);
    
	//Create the window
	glutCreateWindow("POLYGON STIPPLES");
    
	//Calling the drawing function
	glutDisplayFunc(display);
 
	init();

    //Runing the program
	glutMainLoop();
	return 0;
}

void display()
{
	//Clear the window
	glClear(GL_COLOR_BUFFER_BIT);

	//Set the drawing color to red
	glColor3f(1.0,0.0,0.0);

	//specify the pattern
	GLubyte fillPattern[]={
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00,
		0xFF,0x00,0xFF,0x00
	};

	glPolygonStipple(fillPattern);
	glEnable(GL_POLYGON_STIPPLE);
	
    
	//draw unit square polygon
	glBegin(GL_POLYGON);
	   glVertex2f(0.1f,0.1f);
	   glVertex2f(0.1f,0.2f);
	   glVertex2f(0.2f,0.2f);
	   glVertex2f(0.2f,0.1f);
    glEnd();

    glColor3f(1.0,1.0,0.0);
    glBegin(GL_QUADS);
	   glVertex2f(0.05f,0.35f);
	   glVertex2f(0.15f,0.3f);
	   glVertex2f(0.25f,0.4f);
	   glVertex2f(0.25f,0.5f);
	   glVertex2f(0.35f,0.4f);//This will not be executed
    glEnd();

    glColor3f(0.0,1.0,0.0);
	glBegin(GL_TRIANGLES);
	   glVertex2f(0.05f,0.45f);
	   glVertex2f(0.25f,0.6f);
	   glVertex2f(0.15f,0.65f);
	   glVertex2f(0.25f,0.5f);//This will not be executed
	   glVertex2f(0.35f,0.4f);//This will not be executed
    glEnd();

	glBegin(GL_TRIANGLE_STRIP);
	   glVertex2f(0.4f,0.7f);
	   glVertex2f(0.5f,0.8f);
	   glVertex2f(0.55f,0.7f);
       glColor3f(1.0,0.0,0.0);
	   glVertex2f(0.65f,0.8f);//This will not be executed
	glEnd();

	glBegin(GL_QUAD_STRIP);
	   glVertex2f(0.5f,0.45f);
	   glVertex2f(0.6f,0.55f);
	   glVertex2f(0.6f,0.45f);
       glVertex2f(0.7f,0.55f);
       glColor3f(0.0,0.0,1.0);
	   glVertex2f(0.75f,0.45f);
       glVertex2f(0.85f,0.55f);
	glEnd();

    glBegin(GL_TRIANGLE_FAN);
	   glVertex2f(0.5f,0.15f);
 	   glVertex2f(0.65f,0.35f);
	   glVertex2f(0.75f,0.3f);
	   glVertex2f(0.8f,0.25f);
 	   glVertex2f(0.85f,0.15f);
	glEnd();
	glDisable(GL_POLYGON_STIPPLE);
	//Flush the buffer
	glFlush();
}

void init()
{
	//Set the background color
	glClearColor(1.0,1.0,1.0,1.0);
    
	//Sets the mode of matrix operation
	glMatrixMode(GL_PROJECTION);
    
	//Initalizes the transformation matrix to Identity matrix
	glLoadIdentity();
    
	//Viewing the image in the screen
	gluOrtho2D(0,1.0,0,1.0);
}