https://github.com/sunsided/rotated-grid

Rotated grid calculations in Rust for CMYK halftone dithering and more
https://github.com/sunsided/rotated-grid

dithering dithering-images halftone image-processing poster print rust

Last synced: 13 days ago
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Rotated grid calculations in Rust for CMYK halftone dithering and more

• Host: GitHub
• URL: https://github.com/sunsided/rotated-grid
• Owner: sunsided
• License: eupl-1.2
• Created: 2023-07-01T23:28:42.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2024-02-26T11:22:44.000Z (9 months ago)
• Last Synced: 2024-04-27T10:09:40.288Z (7 months ago)
• Topics: dithering, dithering-images, halftone, image-processing, poster, print, rust
• Language: Rust
• Homepage: https://crates.io/crates/rotated-grid
• Size: 127 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE.md

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README

        
# Rotated grids in Rust

🎨 _For halftone dithering and more._

---

This crate provides a generator for enumerating grid coordinates at a specified frequency along a rotated grid.

This can come in useful e.g. when you want to create halftone dithering grids for CMYK processing:



    



See e.g. my [opencv-cartoon-effect](https://github.com/sunsided/opencv-cartoon-effect) repo for an almost-real-world 

usage example.

## Usage example

```rust

use rotated_grid::{Angle, GridPositionIterator, GridCoordinate};

const WIDTH: usize = 16;

const HEIGHT: usize = 10;

fn main() {

    let halftone_grids = [

        ("Cyan", 15.0),

        ("Magenta", 75.0),

        ("Yellow", 0.0),

        ("Black", 45.0),

    ];

    

    for (name, angle) in halftone_grids {

        println!("{name} at {angle}°", name = name, angle = angle);

    

        let grid = GridPositionIterator::new(

            WIDTH as _,

            HEIGHT as _,

            7.0,

            7.0,

            0.0,

            0.0,

            Angle::::from_degrees(angle),

        );

    

        let (_, expected_max) = grid.size_hint();

        let mut count = 0;

    

        for GridCoordinate { x, y } in grid {

            println!("{x}, {y}", x = x, y = y);

            count += 1;

        }

    

        assert!(count <= expected_max.unwrap())

    }

}

```

You can run the example application using

```shell

cargo run --package cmyk

```