python - 在 Jython 中通过对角线镜像图像

Question

所以我需要镜像一个图像。图像的右上角应翻转到左下角。我创建了一个将图像的左上角翻转到右下角的函数，但我似乎无法弄清楚如何以另一种方式做到这一点。这是代码：

def mirrorPicture(picture):
 height = getHeight(canvas)
 width = height 

 # to make mirroring easier, let us make it a square with odd number 
 # of rows and columns
 if (height % 2 == 0):
    height =  width = height -1  # let us make the height and width odd


 maxHeight = height - 1
 maxWidth  = width - 1

 for y in range(0, maxWidth):
      for x in range(0, maxHeight - y):     
      sourcePixel = getPixel(canvas, x, y)
      targetPixel = getPixel(canvas, maxWidth - y, maxWidth - x)
      color = getColor(sourcePixel)
      setColor(targetPixel, color)

 return canvas

顺便说一句，我正在使用一个名为“JES”的 IDE。

Answer 1

如果通过“镜像”，您的意思是“对角翻转”，这应该有效：

def mirrorPicture(picture):
    height = getHeight(picture)
    width = getWidth(picture)

    newPicture = makeEmptyPicture(height, width)

    for x in range(0, width):   
        for y in range(0, height):
            sourcePixel = getPixel(picture, x, y)

            targetPixel = getPixel(newPicture, y, x)
            #                                  ^^^^  (simply invert x and y)
            color = getColor(sourcePixel)
            setColor(targetPixel, color)

    return newPicture

给予：

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