SDL2.0编的模拟贪吃蛇小游戏，随机生成食物，键盘方向键控制蛇的移动方向，有4关，每关蛇的速度会越来越快，背景会切换。游戏需要进行sdl的ttf、image、mixer拓展。-SDL2.0 Snake game series of the simulation randomly generates the direction of movement of food, the keyboard arrow keys to control the snake, four off, each sna