如何在JES中创建拼贴

Question

我有一个项目，可以创建一个拼贴画，其中包含6张图像的副本，其中有些副本被翻转，有些副本具有颜色变化，等等。我对这一切都是全新的，几乎不知道我在做什么。 我写出了代码，但是当我在JES中测试它并命令Explore（newpicture）时，会弹出一个标题为“ None”的白框。 我试图弄乱它，但是被卡住了。 在此之前，我已经有了所有的定义，可以进行翻转，更改颜色百分比等。我想我的问题是我测试不正确，或者是下面的偏移或拼贴代码。 为了测试，我输入：

    verticalPicture = flipVertically(myPict)
    redPicture = matchRedToGreen(myPict)
    negativePicture = negative(myPict)
    bluePicture = clearBlue(myPict)
    clockwisePicture = rotateC90(myPict)
    newpicture = makeCollage(myPict)
    explore(newpicture)

def offsetPicture(littlePicture, bigPicture, xOffset, yOffset):
  for aPixel in getPixels(myPict):
  littleX = getX(aPixel)
  littleY = getY(aPixel)
  bigX = littleX + xOffset
  bigY = littleY + yOffset
  bigPicturePixel = getPixel (bigPicture, bigX, 375)
  setColor(bigPicturePixel, getColor (aPixel))

def makeCollage(myPict):
 newWidth = 3*getWidth(myPict)
 newHeight = 2*getHeight(myPict)
 bigPicture = makeEmptyPicture(newWidth, newHeight)
 offsetPicture(littlePicture, bigPicture, 0, 0)
 offsetPicture(clockwisePicture, bigPicture, getWidth(myPict), 0)
 offsetPicture(redPicture, bigPicture, 0, getHeight(myPict))
 offsetPicture(bluePicture, bigPicture, 2*getWidth(myPict), 0)
 offsetPicture(verticalPicture, bigPicture, getWidth(myPict), getHeight(myPict))
 offsetPicture(negativePicture, bigPicture, 2*getWidth(myPict), 2*getHeight(myPict))
return (bigPicture)

Answer 1

您的代码中有一些缩进错误。 我不知道这是否是将代码复制并粘贴到Stack Overflow中的结果。

发现的错误：

• makeCollage()的return语句需要缩进一个空格。
• offsetPicture() for循环之后的语句需要缩进。

还有下面几行代码位于顶部。 这些行应在定义函数之后进行。

verticalPicture = flipVertically(myPict)
redPicture = matchRedToGreen(myPict)
negativePicture = negative(myPict)
bluePicture = clearBlue(myPict)
clockwisePicture = rotateC90(myPict)
newpicture = makeCollage(myPict)
explore(newpicture)