// Computer Graphics - Amir Hesami
// This program shows the effect of the mouse motion callback function.
// freehand2.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()


#define passive 0
#define active 1
void display();
void reshape(GLsizei, GLsizei);
void init();
void mydisplay(int ,int);

void mousemotion(int, int);

const int wh=500,ww =500; //The size of the window

int main(int argc, char** argv)
{
	int mode=active;
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
	glutInitWindowSize(ww,wh);
	glutInitWindowPosition(100,100);
	glutCreateWindow("Mouse Motion Freehand");
	glutDisplayFunc(display);
	glutReshapeFunc(reshape);
	if (mode==active)
		glutMotionFunc(mousemotion);
	else
	    glutPassiveMotionFunc(mousemotion);
	init();
	glutMainLoop();
	return 0;
}


void mousemotion(int mousex, int mousey)
{
	GLint x = mousex;
	GLint y = wh - mousey;
	mydisplay(x,y);
}

void display(void)
{}

void mydisplay(int xmin,int ymin)
{	
	
	glColor3f(1.0,0.0,0.0);
	glPointSize(3.0);
	glBegin(GL_POINTS);
	   glVertex2i(xmin,ymin);
	        
    glEnd();
	glFlush();
}

void init(void)
{
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(0.0, (GLdouble)ww,0.0 , (GLdouble)wh,-1.0,1.0);
	glClearColor(1.0, 1.0, 1.0, 1.0);
	glClear(GL_COLOR_BUFFER_BIT);

}

void reshape(int ww, int wh)
{   
    glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(0.0, (GLdouble)ww,0.0 , (GLdouble)wh,-1.0,1.0);
    glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	glViewport(0,0,ww, wh);
	glClearColor(1.0,1.0,1.0,1.0);
    glClear(GL_COLOR_BUFFER_BIT);
	
}