// opengl.cpp : Defines the entry point for the console application.
//

#include "glut.h"
#include "math.h"
float x=0,y=0;
void drawCircle (float xc, float yc, float rad)
{
//
// draw a circle centered at (xc,yc) with radius rad
//
glPushMatrix();
glTranslatef(xc,yc,0);
glBegin(GL_LINE_LOOP);
//
for (int angle=0; angle<365; angle=angle+5)
{
float angle_radians = angle * (float)3.14159 / (float)180;
float x = rad * (float)cos(angle_radians);
float y = rad * (float)sin(angle_radians);
glVertex3f(x,y,0);
}
//
glEnd();
glPopMatrix();
}
void display(void)

{
    /* clear window */

     glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();
glTranslatef(x,y,0);
//glRotatef(kat,0,0,1); rotacja w okolo osi z

    /* draw unit square polygon */

    glBegin(GL_POLYGON);
        glVertex2f(-0.5, -0.5);
        glVertex2f(-0.5, 0.5);
        glVertex2f(0.5, 0.5);
        glVertex2f(0.5, -0.5);
    glEnd();

    /* flush GL buffers */
glPopMatrix();
    glFlush();

}


static void Key(unsigned char key, int x_d, int y_d)
{

    switch (key) {
      case '1':
    x+=.1;
    y+=.1;
    glutPostRedisplay();
    break;
    case '2':
    x-=.1;
    y-=.1;
    glutPostRedisplay();
    break;
      case 27:
    exit(0);
    }
}
void init()
{

    /* set clear color to black */

    glClearColor (0.0, 0.0, 0.0, 0.0);
    /* set fill  color to white */

    glColor3f(1.0, 1.0, 1.0);

    /* set up standard orthogonal view with clipping */
    /* box as cube of side 2 centered at origin */
    /* This is default view and these statement could be removed */

    glMatrixMode (GL_PROJECTION);
    glLoadIdentity ();
    glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
glMatrixMode (GL_MODELVIEW);
    glLoadIdentity ();
}
int main(int argc, char* argv[])
{
    glutInit(&argc,argv);
    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(500,500);
    glutInitWindowPosition(0,0);
    glutCreateWindow("simple");
    glutDisplayFunc(display);
    glutKeyboardFunc(Key);
    init();
    glutMainLoop();

    return 0;
}