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

Question

This question can potentially be confusing as it suggests that multiple lines need to be drawn, but does not give precise instructions. To simplify, one can assume that they should draw two lines to get from the top left to bottom right, as below:

Answer 1

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

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

show(img)
return img
```