def on_draw(self):
        self.parent.set_caption(str(pyglet.clock.get_fps()))
        gl.glClear(gl.GL_COLOR_BUFFER_BIT)
        gl.glColor4ub(*[255,255,255,255])
        self.room.bg.blit(0,0)

        self.room.render()
        
        gl.glColor4ub(255,255,255,255)
        self.player.draw()
        self.room.lightbatch.draw()
        self.player.draw_eye()
        self.player.draw_integrity()
        
        if self.pause:
            gl.glColor4ub(50,50,50,150)
            left = self.message['text'].x-self.message['text'].width/2 -5
            down = self.message['text'].y-self.message['text'].height/2 -5
            right = self.message['text'].x+self.message['text'].width/2 + 5
            up = self.message['text'].y+self.message['text'].height/2 + 5
            gl.glRecti(left,down,right,up)
            gl.glLineWidth(2)
            gl.glColor4ub(200,200,200,200)
            gl.glBegin(gl.GL_LINE_LOOP)
            gl.glVertex2i(left,down)
            gl.glVertex2i(left,up)
            gl.glVertex2i(right,up)
            gl.glVertex2i(right,down)
            gl.glEnd()
            gl.glLineWidth(1)
            gl.glColor4ub(255,255,255,255)
            self.message['text'].draw()
            self.message['helper'].draw()
            self.message['sprite'].draw()

def draw_block(block):
    transformed = [world_to_screen(block.GetWorldPoint(p)) for p in POINTS]
    gl.glColor3f(1.0, 0.1, 0)
    gl.glBegin(gl.GL_LINE_LOOP)
    for p in transformed:
        gl.glVertex2f(*p)
    gl.glEnd()

    def draw_button(self, x, y, point_down, over):
        if over and self.pressed:
            border = SCROLL_BAR_PRESSED
        elif over:
            border = SCROLL_BAR_OVER
        else:
            border = SCROLL_BAR_BORDER
        draw_rectangle(x, y, x + self.width, y + self.buttonHeight, 
            border)
        draw_rectangle(x + 1, y + 1, x + self.width - 1, 
            y + self.buttonHeight - 1, SCROLL_BAR_BUTTON)
        glBegin(GL_TRIANGLES)
        glColor4ub(*SCROLL_BAR_POINTER)
        singleX = self.width / 3.0
        upperX = self.width / 2.0
        singleY = self.buttonHeight / 3.0
        if point_down:
            y -= 1
            glVertex2f(singleX + x, singleY * 2 + y)
            glVertex2f(upperX + x, singleY + y)
            glVertex2f(singleX * 2 + x, singleY * 2 + y)

        else:
            glVertex2f(singleX + x, singleY + y)
            glVertex2f(upperX + x, singleY * 2 + y)
            glVertex2f(singleX * 2 + x, singleY + y)
        glEnd()

    def draw(self):
        from miru.context import context
        gl.glEnable(gl.GL_LINE_STIPPLE)
        gl.glLineStipple(1, 0x51315)
        gl.glColor4f(*self.color)
        for c in self.metaCamera.cameras:

            vp = c.projection

            x = vp.x == 0 and 1 or vp.x
            width = vp.x == 0 and vp.width - 1 or vp.width
            width = (vp.x + vp.width) >= context.window.width and width - 1 or width

            y = vp.y == 0 and 1 or vp.y
            height = vp.y == 0 and vp.height - 1 or vp.height
            height = (vp.y + vp.height) >= context.window.height and height - 1 or height

            gl.glBegin(gl.GL_LINE_LOOP)
            gl.glVertex2f(x, y)
            gl.glVertex2f(x, y + height)
            gl.glVertex2f(x + width, y + height)
            gl.glVertex2f(x + width, y)
            gl.glEnd()
        gl.glDisable(gl.GL_LINE_LOOP)
        gl.glColor4f(1,1,1,1)

def rectangle(x1, y1, x2, y2):
    gl.glBegin(gl.GL_TRIANGLE_STRIP)
    gl.glVertex2f(x1, y1)
    gl.glVertex2f(x1, y2)
    gl.glVertex2f(x2, y1)
    gl.glVertex2f(x2, y2)
    gl.glEnd()

 def render_boid(self):
     glBegin(GL_TRIANGLES)
     glColor3f(*self.color)
     glVertex2f(-(self.size), 0.0)
     glVertex2f(self.size, 0.0)
     glVertex2f(0.0, self.size * 3.0)
     glEnd()

    def blit_buffer(self, framebuffer, parent_width, parent_height, **kwargs):
        """Draw the texture into the parent scene

        .. warning:

            This method's arguments are not part of the API yet and may change
            at any time.
        """
        gl.glViewport(0, 0, parent_width, parent_height)

        gl.glTexParameteri(gl.GL_TEXTURE_2D,
            gl.GL_TEXTURE_MAG_FILTER, gl.GL_NEAREST)
        gl.glBindTexture(gl.GL_TEXTURE_2D, framebuffer.texture_id)
        gl.glEnable(gl.GL_TEXTURE_2D)

        gl.glColor4fv((gl.GLfloat * 4)(*self.color + (self.opacity, )))
        gl.glBlendFunc(gl.GL_ONE, gl.GL_ONE_MINUS_SRC_ALPHA)  # premultipl.
        gl.glBegin(gl.GL_TRIANGLE_STRIP)
        gl.glTexCoord2f(0, 0)
        gl.glVertex2i(0, 0)
        gl.glTexCoord2f(0, parent_height)
        gl.glVertex2i(0, parent_height)
        gl.glTexCoord2f(parent_width, 0)
        gl.glVertex2i(parent_width, 0)
        gl.glTexCoord2f(parent_width, parent_height)
        gl.glVertex2i(parent_width, parent_height)
        gl.glEnd()
        gl.glTexParameteri(gl.GL_TEXTURE_2D,
            gl.GL_TEXTURE_MAG_FILTER, gl.GL_LINEAR)
        gl.glDisable(gl.GL_TEXTURE_2D)
        gl.glTexParameteri(gl.GL_TEXTURE_2D,
            gl.GL_TEXTURE_MAG_FILTER, gl.GL_NEAREST)
        gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA)

        gl.glViewport(0, 0, parent_width, parent_height)

 def render_indicators(self, W, H):
     gl.glBegin(gl.GL_QUADS)
     s = W/40.0
     h = H/40.0
     gl.glColor4f(0,0,0,1)
     gl.glVertex3f(W, 0, 0)
     gl.glVertex3f(W, 5*h, 0)
     gl.glVertex3f(0, 5*h, 0)
     gl.glVertex3f(0, 0, 0)
     def vertical_ind(place, val, color):
         gl.glColor4f(color[0], color[1], color[2], 1)
         gl.glVertex3f((place+0)*s, h + h*val, 0)
         gl.glVertex3f((place+1)*s, h + h*val, 0)
         gl.glVertex3f((place+1)*s, h, 0)
         gl.glVertex3f((place+0)*s, h, 0)
     def horiz_ind(place, val, color):
         gl.glColor4f(color[0], color[1], color[2], 1)
         gl.glVertex3f((place+0)*s, 4*h , 0)
         gl.glVertex3f((place+val)*s, 4*h, 0)
         gl.glVertex3f((place+val)*s, 2*h, 0)
         gl.glVertex3f((place+0)*s, 2*h, 0)
     true_speed = np.sqrt(np.square(self.car.hull.linearVelocity[0]) + np.square(self.car.hull.linearVelocity[1]))
     vertical_ind(5, 0.02*true_speed, (1,1,1))
     vertical_ind(7, 0.01*self.car.wheels[0].omega, (0.0,0,1)) # ABS sensors
     vertical_ind(8, 0.01*self.car.wheels[1].omega, (0.0,0,1))
     vertical_ind(9, 0.01*self.car.wheels[2].omega, (0.2,0,1))
     vertical_ind(10,0.01*self.car.wheels[3].omega, (0.2,0,1))
     horiz_ind(20, -10.0*self.car.wheels[0].joint.angle, (0,1,0))
     horiz_ind(30, -0.8*self.car.hull.angularVelocity, (1,0,0))
     gl.glEnd()
     self.score_label.text = "%04i" % self.reward
     self.score_label.draw()

 def run(self):
     while not self.has_exit:
         dt = pyglet.clock.tick()
         self.dispatch_events()
         gl.glClear(gl.GL_COLOR_BUFFER_BIT)
         gl.glLoadIdentity()
         self.shader.use()
         self.shader["real"] = self.real
         self.shader["w"] = self.w
         self.shader["imag"] = self.imag
         self.shader["h"] = self.h
         gl.glBegin(gl.GL_QUADS)
         gl.glVertex3f(0.0, 0.0, 0.0)
         gl.glVertex3f(0.0, self.height, 0.0)
         gl.glVertex3f(self.width, self.height, 0.0)
         gl.glVertex3f(self.width, 0.0, 0.0)
         gl.glEnd()
         self.shader.stop()
         if self.show_fps:
             self.fps.draw()
         if self.auto_zoom_in:
             self.zoom_in(dt)
         if self.auto_zoom_out:
             self.zoom_out(dt)
         self.key_move(dt=dt)
         self.flip()

def draw_circle(cx, cy, r, num_segments=None, mode=gl.GL_POLYGON, color=(1, 1, 1, 1)):
	if not num_segments:
		num_segments = get_num_circle_segments(r)

	theta = 2 * math.pi / float(num_segments)
	tangetial_factor = math.tan(theta)
	radial_factor = math.cos(theta)

	x = float(r)
	y = 0.0

	gl.glColor4f(color[0], color[1], color[2], color[3])
	gl.glBegin(mode)
	for i in xrange(num_segments):
		gl.glVertex2f(x + cx, y + cy)

		tx = y * -1
		ty = x

		x += tx * tangetial_factor
		y += ty * tangetial_factor

		x *= radial_factor
		y *= radial_factor
	gl.glEnd()

    def draw(self, scale, pos):
        LINE_COLOUR = (255, 255, 255)

        # gl.glEnable(gl.GL_DEPTH_TEST);
        gl.glEnable(gl.GL_BLEND)
        gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA)
        gl.glEnable(gl.GL_LINE_SMOOTH)
        gl.glHint(gl.GL_LINE_SMOOTH_HINT, gl.GL_DONT_CARE)

        gl.glBegin(gl.GL_LINES)
        for link in self.links:
            if link.highlight:
                gl.glColor3ub(*self.colour)
                gl.glColor3ub(*self.colour)
            else:
                gl.glColor3ub(*LINE_COLOUR)
                gl.glColor3ub(*LINE_COLOUR)
            if link.highlight:
                depth = 0.5
            else:
                depth = 0.5
            gl.glVertex3f(*util.add_tup(pos, util.scale_tup(link.points[0].pos, scale)) + (depth,))
            gl.glVertex3f(*util.add_tup(pos, util.scale_tup(link.points[1].pos, scale)) + (depth,))
            print util.add_tup(pos, util.scale_tup(link.points[0].pos, scale))
        gl.glEnd()

 def draw(self):
     gl.glClear(gl.GL_DEPTH_BUFFER_BIT)
     if self.game.game_over:
         if self.game.game_lost:
             gl.glBegin(gl.GL_QUADS)
             gl.glColor3f(1, 1, 1)
             gl.glVertex3f(0, 0, -0.9)
             gl.glVertex3f(0, defs.WINDOW_HEIGHT, -0.9)
             gl.glVertex3f(defs.WINDOW_WIDTH, defs.WINDOW_HEIGHT, -0.9)
             gl.glVertex3f(defs.WINDOW_WIDTH, 0, -0.9)
             gl.glEnd()
             self.you_died.draw()
             self.you_died2.draw()
             if not self.died:
                 for name in self.VALUES:
                     getattr(self, name + '_label').color = (0, 0, 0, 255)
             self.died = True
         else:
             gl.glBegin(gl.GL_QUADS)
             gl.glColor3f(0, 0, 0)
             gl.glVertex3f(0, 0, -0.9)
             gl.glVertex3f(0, defs.WINDOW_HEIGHT, -0.9)
             gl.glVertex3f(defs.WINDOW_WIDTH, defs.WINDOW_HEIGHT, -0.9)
             gl.glVertex3f(defs.WINDOW_WIDTH, 0, -0.9)
             gl.glEnd()
             self.you_win.draw()
     for name in self.VALUES:
         getattr(self, name + '_label').draw()

    def _set_texture(self, t):
        self._texture = t
        from pyglet import gl
        try:
            gl.glFramebufferTexture2DEXT(
                gl.GL_FRAMEBUFFER_EXT,
                gl.GL_COLOR_ATTACHMENT0_EXT,
                t.target, t.id, 0,
            )
        except gl.GLException:
            # HACK: Some Intel card return errno == 1286L
            # which means GL_INVALID_FRAMEBUFFER_OPERATION_EXT
            # but IT ACTUALLY WORKS FINE!!
            pass

        gl.glViewport(0, 0, t.width, t.height)

        gl.glMatrixMode(gl.GL_PROJECTION)
        gl.glLoadIdentity()
        gl.gluOrtho2D(0, t.width, 0, t.height)

        gl.glMatrixMode(gl.GL_MODELVIEW)
        gl.glLoadIdentity()

        # ATI cards hack
        gl.glBegin(gl.GL_LINES)
        gl.glEnd()

    def draw_points(self):
        self.points_lock.acquire()

        try:
            from pyglet.gl import glCallList, glBegin, GL_LINE_STRIP, glColor4f, glVertex2f, glEnd

            # line from previous iterate to next iterate of function
            glBegin(GL_LINE_STRIP)
            glColor4f(1, 1, 1, 0.3)

            state_index = self.state_indices[0]

            for i in [1, 2]:
                state_previous = self.point.state[state_index]
                self.point.state = self.system.iterate(self.point.state, self.point.parameters)

                glVertex2f(state_previous, state_previous)
                glVertex2f(state_previous, self.point.state[state_index])

            glEnd()

            # call display lists, doesn't work in init_points()
            if self.server.iteration <= 1:
                glCallList(self.iterate_list)
                glCallList(self.reflection_list)
        except Exception, detail:
            print "draw_points()", type(detail), detail

    def draw(self):
        glPushMatrix()

        glTranslatef(self.xoffset, self.yoffset, self.zoffset)

        def color(i):
            if i % self.graduations_major == 0:
                glColor4f(*self.color_grads_major)
            elif i % (self.graduations_major / 2) == 0:
                glColor4f(*self.color_grads_interm)
            else:
                if self.light: return False
                glColor4f(*self.color_grads_minor)
            return True

        # draw the grid
        glBegin(GL_LINES)
        for i in range(0, int(math.ceil(self.width + 1))):
            if color(i):
                glVertex3f(float(i), 0.0, 0.0)
                glVertex3f(float(i), self.depth, 0.0)

        for i in range(0, int(math.ceil(self.depth + 1))):
            if color(i):
                glVertex3f(0, float(i), 0.0)
                glVertex3f(self.width, float(i), 0.0)
        glEnd()

        # draw fill
        glColor4f(*self.color_fill)
        glRectf(0.0, 0.0, float(self.width), float(self.depth))

        glPopMatrix()

def rect(a, b, color=(1.0,1.0,1.0), alpha=1.0):
    """
    Draws a rectangle in the plane spanned by a,b with GL_QUADS

    :param a: Point a
    :type a: 2-float tuple

    :param b: Point b
    :type b: 2-float tuple

    :param color: the color in [0..1] range
    :type color: 3-float tuple

    :param aa: Anti aliasing Flag

    :param alpha: the alpha value in [0..1] range

    """

    glDisable(GL_TEXTURE_2D)

    glBegin(GL_QUADS)
    glVertex3f(a[0], a[1], 0)
    glVertex3f(b[0], a[1], 0)
    glVertex3f(b[0], b[1], 0)
    glVertex3f(a[0], b[1], 0)

    glEnd()
    glEnable(GL_TEXTURE_2D)
    glColor4f(color+(alpha,))

    def draw_points(self):
        self.points_lock.acquire()
        
        try:
            from pyglet.gl import glBegin, glEnd, GL_POINTS, glColor4f, glVertex2f
                   
            glBegin(GL_POINTS)
               
            for i in xrange(0, len(self.points)):
                p = self.points[i]
                parameter_index = self.parameter_indices[0]
                state_index = self.state_indices[0]

                glColor4f(1, 1, 1, p.age / (self.age_max*2.0))
                glVertex2f(p.parameters[parameter_index], p.state[state_index])
                
                p.state = self.system.iterate(p.state, p.parameters)
                p.age += 1
                
                #if p.age >= self.age_max:
                #    self.points[i] = OrbitPoint(tool=self, varying_parameter=p.parameters[parameter_index])
            
            glEnd()
        except Exception, detail:
            print 'draw_points()', type(detail), detail

 def f():
     for u in range(1, len(self.u_set)):
         pgl.glBegin(pgl.GL_QUAD_STRIP)
         for v in range(len(self.v_set)):
             pa = self.verts[u - 1][v]
             pb = self.verts[u][v]
             if pa is None or pb is None:
                 pgl.glEnd()
                 pgl.glBegin(pgl.GL_QUAD_STRIP)
                 continue
             if use_cverts:
                 ca = self.cverts[u - 1][v]
                 cb = self.cverts[u][v]
                 if ca is None:
                     ca = (0, 0, 0)
                 if cb is None:
                     cb = (0, 0, 0)
             else:
                 if use_solid_color:
                     ca = cb = self.default_solid_color
                 else:
                     ca = cb = self.default_wireframe_color
             pgl.glColor3f(*ca)
             pgl.glVertex3f(*pa)
             pgl.glColor3f(*cb)
             pgl.glVertex3f(*pb)
         pgl.glEnd()

 def draw(self, colour=(0., 0., 1.)):
   s = self.size # just a shorthand
   gl.glColor3f(*colour)
   gl.glBegin(gl.GL_LINE_LOOP)
   for vertex in self.verticies:
     gl.glVertex2f(*vertex)
   gl.glEnd()

def nakresli_caru(x1, y1, x2, y2):
   
    gl.glBegin(gl.GL_LINES)
    #  gl.glBegin(gl.GL_TRIANGLE_FAN)
    gl.glVertex2f(x1, y1)
    gl.glVertex2f(x2, y2)   
    gl.glEnd()