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glOrtho... by myllymaa
1
 
W and H are the width and height of the window

void drawHud()
{
  glMatrixMode(GL_PROJECTION);
  glPushMatrix();
  glLoadIdentity();

  glOrtho(0,W,0,H,-1,10);
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();

  glDisable(GL_LIGHTING);

  glTranslatef(hudPosX,H-hudPosY-hudHeight,0);

  glColor4f(1,1,1,0.5);
  glBegin(GL_POLYGON);
  glVertex3f(120,0,0);
  glVertex3f(120,30,0);
  glVertex3f(0,30,0);
  glVertex3f(0,0,0);
  glEnd();

<some stuff more>
}


then picking:

void mouseMotion(int x, int y)
{
  GLfloat sx,sy;

  sx = x-mouseOriginX;
  sy = y-mouseOriginY;

  if((x>hudPosX) && (x<(hudPosX+hudLength)) &&
     (y>hudPosY) && (y<(hudPosY+hudHeight)))
  {
    hudPosX = origHudPosX + sx;
    hudPosY = origHudPosY + sy;
  }
  glutPostRedisplay();
}