在JES中镜像镜像

Question

我在试着镜像一个图像。也就是说，如果一个人面朝左，当程序终止时，我希望这个人现在面朝右。

我理解JES中的镜像是如何工作的，但我不确定如何在这里进行。下面是我正在尝试的；请注意，image是在另一个函数中声明的全局变量。

def flipPic(image):
  width = getWidth(image)
  height = getHeight(image)
  for y in range(0, height):
    for x in range(0, width):
       left = getPixel(image, x, y)
       right = getPixel(image, width-x-1, y)
       color = getColor(left)
       setColor(right, color)
  show(image)
  return image

Answer 1

尝尝这个

width = getWidth(pic)
height = getHeight(pic)
for y in range (0,height):
    for x in range (0, width/2):
        left=getPixel(pic, x, y)
        right=getPixel(pic, width-x-1,y)
        color1=getColor(left)
        color2=getColor(right)
        setColor(right, color1)
        setColor(left, color2)
repaint(pic) 

Answer 2

我个人发现repaint对于新手(比如我！)来说是令人困惑的。我建议这样做：

def mirrorImage(image):

width = getWidth(image)
height = getHeight(image)
for y in range (0,height):
    for x in range (0, width/2):
        left=getPixel(pic, x, y)
        right=getPixel(pic, width-x-1,y)
        color1=getColor(left)
        color2=getColor(right)
        setColor(right, color1)
        setColor(left, color2)
        show(image)
        return image
mirrorImage(image)

Answer 3

这似乎工作得很好..我放了一些注释，这样你就可以用你自己的风格重写了。

请随时提问，但我认为您的问题可能已经得到回答^^

#this function will take the pixel values for a selected picture and 
#past them to a new canvas but fliped over! 
def flipPic(pict):
#here we take the height and width of the original picture
  width=getWidth(pict)
  height=getHeight(pict)
#here we make and empty canvas  
  newPict=makeEmptyPicture(width,height) 
#the Y for loop is setting the range to working for the y axes the started the X for loop 
  for y in range(0, height):
#the X for loop is setting the range to work in for the x axis 
    for x in range(0, width):
#here we are collecting the colour information for the origional pix in range of X and 
      colour=getColor(getPixel(pict,x,y))
#here we are setting the colour information to its new position on the blank canvas
      setColor(getPixel(newPict,width-x-1,y),colour)
      #setColor(getPixel(newPict,width-x-1,height-y-1),colour)#upsidedown
  show(newPict)

#drive function
pict = makePicture(pickAFile())
show(pict)
flipPic(pict)

如果你先把它复制到JES上，可能会更容易阅读:D

顺便说一句，我在我的编程入门课上得到了满分;)