Question

目前正在使用python设计蛇游戏，使用import.draw，没有pygame！我的大部分游戏都已经完成并且运行得非常好，除了每次点击箭头（向上，向下，向左或向右）之后蛇的长度变得更大，这不是我想要的发生这种情况，因为一旦蛇吃掉苹果，长度应该变大！这是我的代码：导入Draw 随机导入

Draw.setCanvasSize(600,600)
masterList = [[None for col in range(30)] for row in range(30)]

def startscreen():  #WELCOME SCREEN
#set screen
#(may change to loop later)
Draw.setBackground(Draw.CYAN)
Draw.setColor(Draw.RED)
Draw.filledRect(0,100,600,200)
Draw.setColor(Draw.GREEN)
Draw.filledRect(0,200,600,200)
Draw.setColor(Draw.PINK)
Draw.filledRect(0,200,600,200)
Draw.setColor(Draw.BLUE)
Draw.filledRect(0,300,600,200)
Draw.setColor(Draw.YELLOW)
Draw.filledRect(0,400,600,200)
Draw.setColor(Draw.VIOLET)
Draw.filledRect(0,500,600,200)
Draw.setFontSize(80)
Draw.setFontFamily("Courier")
a = "SNAKE GAME"
Draw.setColor(Draw.BLACK)
Draw.string(a,50,220)
Draw.setFontSize(35)
Draw.string("CLICK ANYWHERE TO CONTINUE",30,330)

def clickAnywhere():
while True:
    if Draw.mousePressed():
        return True

#code for press enter to continue using draw package and keys
def playGame(size):
#choose starting point for apple
appleX = random.randrange(0, 580, 20)
appleY = random.randrange(0, 580, 20)  
positionApple = random.randrange(0, 580, 20) 

masterList[positionApple//20][positionApple//20] = 'a'

# initial position of snake in middle
lengthSnake = 4 # four boxes
positionSnakeX = 300
positionSnakeY = 300
for i in range(15, 19):
    masterList[15][i] = 'x'

drawTheBoard(appleX,appleY, positionSnakeX, positionSnakeY,lengthSnake)

#while positionSnake != 0 and positionSnake != 600:
while True:
    # check if user pressed a key to change snake direction
    if Draw.hasNextKeyTyped():
        newKey = Draw.nextKeyTyped()
        if newKey == "Left":
            positionSnakeX -= 20
            lengthSnake += 1
        elif newKey == "Right":
            positionSnakeX += 20   
            lengthSnake += 1
        elif newKey == "Up":
            positionSnakeY -= 20 
            lengthSnake += 1
        elif newKey == "Down":
            positionSnakeY += 20  
            lengthSnake += 1

        drawTheBoard(appleX,appleY, positionSnakeX, positionSnakeY, 
lengthSnake)


    # if snake hit the apple, then add a box to the snake
    if hitApple(positionSnakeX, positionSnakeY, positionApple, positionApple):
        lengthSnake += 1
        masterList[positionApple/20][positionApple/20] = None
        positionApple = random.randrange(0, 580, 20)
        masterList[positionApple/20][positionApple/20] = 'a'

    #check if snake hit wall using hitWall()
  #      if hitWall(positionSnake, positionSnake):
   #          return False # will this break the while loop 

    # check if snake hit itself

    # otherwise draw the board
    #    drawTheBoard(positionApple, positionSnakeX, positionSnakeY, 
   lengthSnake) # function that clears and resets board after each round
    #def moveSnake(s,dx,dy):
   #head= s[0]
   #news= [[head[0] + dy, head[1]+dx]]+s[0:-1]]
   #return news

 def drawTheBoard(appleX,appleY,snakeX,snakeY,lengthSnake):
#clear Canvas
Draw.clear()
#Draw Snake using for loop to draw the number of rectangles corresponding to
#how many boxes in 2D list it has
Draw.picture("snakeBackground.gif",0,0)
Draw.setColor(Draw.BLACK)
for i in range(lengthSnake):
    Draw.filledRect(snakeX+(20*i), snakeY, 20, 20)
    # change the x, y coordinates based on 2D list

# Draw Apple
Draw.setColor(Draw.RED)
drawApple(appleX, appleY)
if snakeX == appleX and snakeY == appleY:
    drawApple()

    #return true
    #if snake hit wall
    #return False
Draw.show()

 def drawApple(appleX, appleY):
   #appleX = random.randrange(0, 580, 20) 
   #appleY = random.randrange(0, 580, 20) 
   Draw.setColor(Draw.RED)
   Draw.filledOval(appleX, appleY, 20, 20)       

 def hitApple(snakeX, snakeY, appleX, appleY):
if (appleX < snakeX < appleX + 20) or (appleY < snakeY < appleY + 20):
    return True
return False

 #def hitWall(snakeCoords):
#use x, y coordinates to check if snake hit wall, returning True or False
#if snake's x is less than 0 or x is greater than or equal to numCols
#if y is less than 0 or y is greater than or equal to numRows
#return True
# Else, return False
# (0,600) is considered hitting the wall

 def main():
startscreen()
if clickAnywhere():
    Draw.clear()
#clear the screen
snakeSize = 4
#for each of x times
#ans= playGame(size)
#If ans= playGame(size):
#snakeSize += 1
playGame(snakeSize)

#Draw.show（） main（）的

Answer 1

你执行

lengthSnake += 1

每次Draw.hasNextKeyTyped()都是真实的（关键是＆＃34;左＆＃34; /＆＃34;右＆＃34; /＆＃34; Up＆＃34; /＆＃34; Down＆＃ 34。）

Answer 2

通过这个while循环，每按一次键就会告诉计算机加一个蛇的长度。

while True:
    # check if user pressed a key to change snake direction
    if Draw.hasNextKeyTyped():
        newKey = Draw.nextKeyTyped()
        if newKey == "Left":
            positionSnakeX -= 20
            lengthSnake += 1
        elif newKey == "Right":
            positionSnakeX += 20   
            lengthSnake += 1
        elif newKey == "Up":
            positionSnakeY -= 20 
            lengthSnake += 1
        elif newKey == "Down":
            positionSnakeY += 20  
            lengthSnake += 1`enter code here`

从每个if块中删除lengthSnake + = 1。

蛇游戏帮助 - 不使用Pygame（Python）

2 个答案: