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

static GLfloat spin = 0.0;

void init (void){
	glClearColor(0.0,0.0,0.0,0.0);
	glShadeModel(GL_FLAT);
}

void display(void){
	glClear(GL_COLOR_BUFFER_BIT);
	glPushMatrix();
	glRotatef(spin,0.0,0.0,1.0);
	glColor3f(1.0,1.0,1.0);
	glRectf(-25.0,-25.0,25.0,25.0);
	glPopMatrix();
	glutSwapBuffers();
}
void spinDisplay(void){
	spin=spin+2.0;
	if(spin>360.0)
		spin=spin - 360.0;
	glutPostRedisplay();
}

void reshape (int w, int h){
	glViewport (0,0,  (GLsizei) w, (GLsizei) h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(-50.0,50.0,-50.0,50.0,-1.0,1.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}

void mouse(int button,int state, int x , int y){
	switch(button){
		case GLUT_LEFT_BUTTON:
			if (state==GLUT_DOWN)
				glutIdleFunc(spinDisplay);
			break;
		case GLUT_MIDDLE_BUTTON:
			if(state==GLUT_DOWN)
				glutIdleFunc(NULL);
			break;
		default:
			break;
	}
}

int main(int argc, char** argv){
	glutInit(&argc,argv);
	glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
	glutInitWindowSize(250,250);
	glutInitWindowPosition(100,100);
	glutCreateWindow(argv[0]);
	init();
	glutDisplayFunc(display);
	glutReshapeFunc(reshape);
	glutMouseFunc(mouse);
	glutMainLoop();
	return 0;
}