def _gen_grid()

in gym-minigrid/gym_minigrid/envs/putnear.py [0:0]

• 46 lines of code
• 13 McCabe index (conditional complexity)

    def _gen_grid(self, width, height):
        self.grid = Grid(width, height)

        # Generate the surrounding walls
        self.grid.horz_wall(0, 0)
        self.grid.horz_wall(0, height-1)
        self.grid.vert_wall(0, 0)
        self.grid.vert_wall(width-1, 0)

        # Types and colors of objects we can generate
        types = ['key', 'ball', 'box']

        objs = []
        objPos = []

        def near_obj(env, p1):
            for p2 in objPos:
                dx = p1[0] - p2[0]
                dy = p1[1] - p2[1]
                if abs(dx) <= 1 and abs(dy) <= 1:
                    return True
            return False

        # Until we have generated all the objects
        while len(objs) < self.numObjs:
            objType = self._rand_elem(types)
            objColor = self._rand_elem(COLOR_NAMES)

            # If this object already exists, try again
            if (objType, objColor) in objs:
                continue

            if objType == 'key':
                obj = Key(objColor)
            elif objType == 'ball':
                obj = Ball(objColor)
            elif objType == 'box':
                obj = Box(objColor)

            pos = self.place_obj(obj, reject_fn=near_obj)

            objs.append((objType, objColor))
            objPos.append(pos)

        # Randomize the agent start position and orientation
        self.place_agent()

        # Choose a random object to be moved
        objIdx = self._rand_int(0, len(objs))
        self.move_type, self.moveColor = objs[objIdx]
        self.move_pos = objPos[objIdx]

        # Choose a target object (to put the first object next to)
        while True:
            targetIdx = self._rand_int(0, len(objs))
            if targetIdx != objIdx:
                break
        self.target_type, self.target_color = objs[targetIdx]
        self.target_pos = objPos[targetIdx]

        self.mission = 'put the %s %s near the %s %s' % (
            self.moveColor,
            self.move_type,
            self.target_color,
            self.target_type
        )