https://github.com/siraben/functional-images

Replicating the Functional Images paper by Conal Elliott using Haskell, C and SDL2.
https://github.com/siraben/functional-images

c functional-reactive-programming haskell sdl2

Last synced: 3 months ago
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Replicating the Functional Images paper by Conal Elliott using Haskell, C and SDL2.

• Host: GitHub
• URL: https://github.com/siraben/functional-images
• Owner: siraben
• License: mit
• Created: 2020-07-06T09:35:10.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2020-07-06T09:59:05.000Z (almost 5 years ago)
• Last Synced: 2025-02-10T11:11:14.477Z (4 months ago)
• Topics: c, functional-reactive-programming, haskell, sdl2
• Language: Haskell
• Homepage:
• Size: 6.92 MB
• Stars: 1
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Replicating the Functional Images Paper

![Figure 19](figures/fig19.png)

In _Functional Images_ Conal Elliott presents a refreshing take on

what an image is, a _function_ from points to colors.  With this

precise semantic model we can take advantage of various laws and

typeclasses related to functions, and experiment with different kinds

of images, for instance, regions, which are functions from points to

booleans.

It's a gem of a paper, however it's been almost 20 years since the

release of the [Pan](http://conal.net/Pan/Releases/default.htm)

functional image library.  This is my attempt at reproducing the paper

using more modern libraries such as SDL2.  The project is split in the

following parts;

- `render.c` - C backend for rendering with SDL2

- `Picture.hs` - the Haskell program implementing the code from

  functional images (along with typo corrections)

- `Timing.c` - helper program to report timing information

## Requirements

- `ghc` - GHC Haskell compiler

- SDL2 library

- `make`

## Building and Running

Type `make run` to build the project and launch a window showing the

animation `mainAnim` (see `Picture.hs`).  For instance, to see Figure

19, change `mainAnim` to `mainAnim = static fig19`.  For a figure that's an

animation, for instance Figure 32, change it to `mainAnim = fig32`.

The function `calculate` performs time and coordinate normalization so

that it can be adjusted as pleased to slow down or speed up time, or

change the duration of the animation.