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

int angle = 0;
void init() {
	// set matrix mode to PROJECTION mode
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D(0,200,0,200);
	
	
}



void drawTriangle() {
	//delete buffers
	glPushMatrix();	
	glClear(GL_COLOR_BUFFER_BIT);
	glLineWidth(5.0);
	glShadeModel(GL_SMOOTH);

	
	glTranslatef(100.0f, 100.0f,0.0f);
	glRotatef(angle, 0.0f, 0.0f, 1.0f);
	glTranslatef(-100.0f, -100.0f,0.0f);

	glBegin(GL_TRIANGLES);
		glColor3f(1.0f, 0.0f, 0.0f); /* red */
		glVertex2i(60,60);
		
		glColor3f(0.0f, 1.0f, 0.0f); /* red */
		glVertex2i(100,140);

		glColor3f(0.0f, 0.0f, 1.0f); /* blue */
		glVertex2i(140,60);
	glEnd();

	glPopMatrix();
}

void keyboard(unsigned char key, int x, int y) {
	switch(key) {
		case 27: 
			exit(0);
			break;
	}
}

// Called to draw scene
void RenderScene(void)
	{
	// Clear the window with current clearing color
	glClear(GL_COLOR_BUFFER_BIT);
	
	drawTriangle();

	// Flush drawing commands
	glutSwapBuffers();
	}


// Setup the rendering state
void SetupRC(void)
    {
    // Set clear color to black
    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
	
	

    }

void Timer(int value)
{
  printf("Timer esemeny (%d)\n", value);
  angle += 2.0f;
  if( angle > 360.0f ) angle = 0.0f;
  glutPostRedisplay();
  glutTimerFunc(10, Timer, value + 1);
}

void Idle()
{

  glutPostRedisplay();
}




// Main program entry point
int main(int argc, char* argv[])
    {
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
	glutInitWindowSize(100,100);
	glutInitWindowPosition(20,20);
	
	glutCreateWindow("Points");
	SetupRC();
	
	init();
	glutDisplayFunc(RenderScene);
	glutKeyboardFunc(keyboard);
	glutTimerFunc(10, Timer, 1); // 1 mp mulva meghivodik a Timer() fuggveny
	glutIdleFunc(Idle); // Idle(), ha nem tortenik semmi

	

	glutMainLoop();

	return 0;
    }