def draw(self):
        self.plot._render_lock.acquire()
        self.camera.apply_transformation()

        calc_verts_pos, calc_verts_len = 0, 0
        calc_cverts_pos, calc_cverts_len = 0, 0

        should_update_caption = (clock() - self.last_caption_update >
                                 self.caption_update_interval)

        if len(self.plot._functions.values()) == 0:
            self.drawing_first_object = True

        for r in self.plot._functions.itervalues():
            if self.drawing_first_object:
                self.camera.set_rot_preset(r.default_rot_preset)
                self.drawing_first_object = False

            glPushMatrix()
            r._draw()
            glPopMatrix()

            # might as well do this while we are
            # iterating and have the lock rather
            # than locking and iterating twice
            # per frame:

            if should_update_caption:
                try:
                    if r.calculating_verts:
                        calc_verts_pos += r.calculating_verts_pos
                        calc_verts_len += r.calculating_verts_len
                    if r.calculating_cverts:
                        calc_cverts_pos += r.calculating_cverts_pos
                        calc_cverts_len += r.calculating_cverts_len
                except __HOLE__:
                    pass

        for r in self.plot._pobjects:
            glPushMatrix()
            r._draw()
            glPopMatrix()

        if should_update_caption:
            self.update_caption(calc_verts_pos, calc_verts_len,
                                calc_cverts_pos, calc_cverts_len)
            self.last_caption_update = clock()

        if self.plot._screenshot:
            self.plot._screenshot._execute_saving()

        self.plot._render_lock.release()
dataset/ETHPy150Open sympy/sympy/sympy/plotting/pygletplot/plot_window.py/PlotWindow.draw