simple snake game in pygame movement limitation-CodePudding

Hi im building simple snake game, its almost finished but i have problem with snake movement. For example if the snake is moving right and i press left he goes into himslef. i probably can solve this problem but all my ideas are to complicated. im sure there are simplier soulutions

    def move_up(self):
        self.direction = "up"

    def move_down(self):
        self.direction = "down"

    def move_right(self):
        self.direction = "right"

    def move_left(self):
        self.direction = "left" ```

CodePudding user response：

there is no question in your title nor in description,

some mathematical resolution to your problem could be to put numbers to your directions, for example up=1 down=-1 left=2 right=-2 and then on keypress to change direction check:

if not actualPosition   newPosition:
    #dont do anything since collision
else:
    #do your action

CodePudding user response：

You can check if the new direction is different from the old one. If it is diffrent, you update the direction, otherwise you keep the same direction:

    def new_dir(self, new_dir):
        return new_dir if new_dir != self.direction else self.direction     

    def move_up(self):
        self.direction = self.new_dir("up")

    def move_down(self):
        self.direction = self.new_dir("down")

    def move_right(self):
        self.direction = self.new_dir("right")

    def move_left(self):
        self.direction = self.new_dir("left")