/*   demo2a.c   */

/* 
   Purpose:  Drawing Primitives in OpenGL
*/

#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif

#include <stdlib.h>
#include <stdio.h>

#define KEY_ESC 27  /* glut doesn't define this  */

GLvoid keyboard( GLubyte key, GLint x, GLint y)
{
	switch (key) 
	{
	case KEY_ESC:   /* exit when escape key is pressed */
		exit(0);
	break;
    case ' ':           /* Generate another 1000 points */
		glutPostRedisplay();
    break;
    }
	
}

GLvoid display(GLvoid)
{
	/*  Do all your OpenGL rendering here  */
	glClear(GL_COLOR_BUFFER_BIT);

	glColor3f(0.0,0.0,0.0);

	glPointSize(8.0);
	glLineWidth(5.0);

	glBegin(GL_POINTS);
		glVertex2f(-0.75,-0.75);
		glVertex2f(-0.25,-0.25);
		glVertex2f(0.0,0.5);
		glVertex2f(0.75,0.5);
	glEnd();


	glFlush();
}

void init(void)
{
	/* set background color */
	glClearColor(1.0,0.0,0.0,1.0);
}

int main(int argc, char* argv[])
{
	GLint width;
	GLint height;

	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);

	width = glutGet(GLUT_SCREEN_WIDTH);
	height = glutGet(GLUT_SCREEN_HEIGHT);
	glutInitWindowPosition(width/4, height/4);
	glutInitWindowSize(width/2, height/2);
	glutCreateWindow(argv[0]);

	glutDisplayFunc( display );
	glutKeyboardFunc( keyboard );

	init();

	glutMainLoop();

	return 0;
}