draw accumulated instructions in context

def _draw(self, context, opacity):
        """draw accumulated instructions in context"""

        # if we have been moved around, we should update bounds
        fresh_draw = len(self.__new_instructions or []) > 0
        if fresh_draw: #new stuff!
            self.paths = []
            self.__instruction_cache = self.__new_instructions
            self.__new_instructions = []
        else:
            if not self.__instruction_cache:
                return

        for instruction, args in self.__instruction_cache:
            if fresh_draw:
                if instruction in ("new_path", "stroke", "fill", "clip"):
                    self.paths.append((instruction, "path", context.copy_path()))

                elif instruction in ("save", "restore", "translate", "scale", "rotate"):
                    self.paths.append((instruction, "transform", args))

            if instruction == "set_color":
                self._set_color(context, args[0], args[1], args[2], args[3] * opacity)
            elif instruction == "show_layout":
                self._show_layout(context, *args)
            elif opacity < 1 and instruction == "paint":
                context.paint_with_alpha(opacity)
            else:
                getattr(context, instruction)(*args)