#include <gl/glut.h>
#include <stdio.h>
#define GLUT_DISABLE_ATEXIT_HACK
//Clipping window limits
float xwmin=0, xwmax=640, ywmin=0, ywmax=480;
//Application window dimensions
int windowWidth=640, windowHeight=480;
GLfloat xw1=0,yw1=0;
GLfloat xw2=xw1+20,yw2=yw1+20;
void display()
{
glClearColor(1,1,1,0);
glClear(GL_COLOR_BUFFER_BIT);
glRectf(xw1,yw1,xw2,yw2);
glFlush();
}
void mouseButtonClicked(int button,int state,int x, int y)
{
if(state==GLUT_DOWN)
{
printf("Mouse click event detected (button down).\n");
//Converting coordinates captured by event handler to world coordinates
xw1=(float)(xwmin+(float)(x)*(xwmax-xwmin)/(float)(windowWidth));
yw1=(float)(ywmin+(float)(windowHeight-y)*(ywmax-ywmin)/(float)(windowHeight));
xw2=xw1+20;
yw2=yw1+20;
if (button==GLUT_LEFT_BUTTON)
glColor3f(1,0,0);
else if (button==GLUT_MIDDLE_BUTTON)
glColor3f(0,1,0);
else if (button==GLUT_RIGHT_BUTTON)
glColor3f(0,0,1);
//Generate a display event
glutPostRedisplay();
}
}
int main(int argc, char** argv)
{
	glutInit(&argc,argv);
	glutInitWindowPosition(50,50);
	glutInitWindowSize(windowWidth,windowHeight);
	glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
	glutCreateWindow("Mouse active motion events");
	glMatrixMode(GL_PROJECTION);
	gluOrtho2D(xwmin,xwmax,ywmin,ywmax);
	glutDisplayFunc(display);
	//glutMotionFunc(mouseActiveMotion);
	glutMouseFunc(mouseButtonClicked);
	glutMainLoop();
	return 0;
}