Because the DrRacket interactions window seems to clip overly-large images, two images that should look very visibly distinct in the interactions window can actually end up resembling one another.
#lang htdp/isl+
(require 2htdp/image)
(define BIG-CIRCLE (circle 3000 "solid" "blue"))
(define ACTUALLY-CLIPPED-CIRCLE
(crop 0 0 4167 6000 BIG-CIRCLE))
BIG-CIRCLE
ACTUALLY-CLIPPED-CIRCLE
(image-width BIG-CIRCLE)
(image-height BIG-CIRCLE)
(image-width ACTUALLY-CLIPPED-CIRCLE)
(image-height ACTUALLY-CLIPPED-CIRCLE)
When a user copies that clipped image back to the definitions window, the clipped cache silently becomes the copied/exported representation of the full image.
Copying and pasting such an image into a check-expect leads to perhaps-surprising test failure error messages, where the images look the same but its frames that look different.
Because the DrRacket interactions window seems to clip overly-large images, two images that should look very visibly distinct in the interactions window can actually end up resembling one another.
When a user copies that clipped image back to the definitions window, the clipped cache silently becomes the copied/exported representation of the full image.
Copying and pasting such an image into a check-expect leads to perhaps-surprising test failure error messages, where the images look the same but its frames that look different.