Draw diagonal lines on a picture from top right to bottom left using addLine.

What will be an ideal response?

```
def lineDiagonal2 ():
img = makePicture(pickAFile())
midHeight = getHeight(img)/2
midWidth = getWidth(img)/2

addLine(img, getWidth(img), 0, midWidth, midHeight)
addLine(img, midWidth, midHeight, 0, getHeight(img))

show(img)
return img
```