Write a general crop function that takes a source picture, the start X value, the start Y value, the end X value, and the end Y value. Create and return the new picture and copy just the specified area into the new picture.

What will be an ideal response?

```
def crop (src, x1, y1, x2, y2):
w = getWidth(src)
h = getHeight(src)
canvas = makeEmptyPicture(x2-x1,y2-y1)
for x in range(x1, x2):
for y in range(y1,y2):
p = getPixel(canvas, x-x1, y-y1)
p2 = getPixel(src, x, y)
color = getColor(p2)
setColor(p, color)
return canvas
```

Note: The important lines here are to make sure that you grab from the correct pixels from the canvas. Grabbing the pixels “x” and “y” will not work, as they may be larger than the canvas you’re copying to.