Tiles Teachpack
| (require tiles/tiles) |
1 About This Teachpack
Provides a variety of functions for combining and manipulating images. Imagine that each image were on a ceramic tile; you would expect to be able to put two tiles together side by side, or one above another, or rotate a tile, etc. That’s exactly what this teachpack provides.
2 Installation
If you’re reading this, you’ve probably already installed the teachpack successfully, but if you need to install it on a different machine, ...
start DrScheme
switch languages to Module and click "Run"
in the Interactions pane, type
after a few seconds, you should see the message "Wrote file "tiles.ss" to installed-teachpacks directory."
switch languages back to one of the HtDP languages, like Beginning Student
from the Language menu, choose "Add Teachpack..." and select "tiles.ss"
click "Run"
3 Functions
| (image-above img1 img2 ) → image? |
| img1 : image? |
| img2 : image? |
Combines two or more images into one, putting the first above the second (above the third, ...).
| (image-above-align-right img1 img2 ) → image? |
| img1 : image? |
| img2 : image? |
Just like image-above, but lines up the right-hand edges of all the images.
| (image-above-align-left img1 img2 ) → image? |
| img1 : image? |
| img2 : image? |
Just like image-above, but lines up the left-hand edges of all the images.
| (image-above-align-center img1 img2 ) → image? |
| img1 : image? |
| img2 : image? |
Just like image-above, but lines up the centers of all the images.
| (image-beside img1 img2 ) → image? |
| img1 : image? |
| img2 : image? |
Combines two or more images into one, putting the first to the left of the second (to the left of the third, ...).
| (image-beside-align-top img1 img2 ) → image? |
| img1 : image? |
| img2 : image? |
Just like image-beside, but lines up the top edges of all the images.
| (image-beside-align-bottom img1 img2 ) → image? |
| img1 : image? |
| img2 : image? |
Just like image-beside, but lines up the bottom edges of all the images.
| (image-beside-align-center img1 img2 ) → image? |
| img1 : image? |
| img2 : image? |
Just like image-beside, but lines up the centers of all the images.
| (reflect-vert img) → image? |
| img : image? |
Flips an image top-to-botom.
| (reflect-horiz img) → image? |
| img : image? |
Flips an image left-to-right.
| (reflect-main-diag img) → image? |
| img : image? |
Flips an image from top-right to bottom-left, leaving the top-left and bottom-right unchanged.
| (reflect-other-diag img) → image? |
| img : image? |
Flips an image from top-left to bottom-right, leaving the top-right and bottom-left unchanged.
| (rotate-cw img) → image? |
| img : image? |
Rotates an image 90 degrees clockwise.
| (rotate-ccw img) → image? |
| img : image? |
Rotates an image 90 degrees counterclockwise.
| (rotate-180 img) → image? |
| img : image? |
Rotates an image 180 degrees around its center.
| (show-pinhole img) → image? |
| img : image? |
Overlays a small black dot at the pinhole of the given image, so you can see where it is. (This function will go away when pinholes go away....)
| (crop-top img pixels) → image? |
| img : image? |
| pixels : natural-number/c |
Chops off the specified number of pixels from the top of the image.
| (crop-bottom img pixels) → image? |
| img : image? |
| pixels : natural-number/c |
Chops off the specified number of pixels from the bottom of the image.
| (crop-left img pixels) → image? |
| img : image? |
| pixels : natural-number/c |
Chops off the specified number of pixels from the left side of the image.
| (crop-right img pixels) → image? |
| img : image? |
| pixels : natural-number/c |
Chops off the specified number of pixels from the right side of the image.
4 Functions from image.ss
Since anybody using these functions will almost certainly also want to use other image-creation and image-manipulation functions, this teachpack includes the standard teachpack image.ss. That is, if you have tiles.ss loaded, you don’t also need image.ss (and you’re better off not loading it).