extern crate framing;
extern crate png_framing;

use framing::{Chunky, Function, Rgba};

fn main() {
    let image = Function::new(512, 512, |x, y| {
        let x = x as f64 / 256.0 - 1.0;
        let y = y as f64 / 256.0 - 1.0;
        let z = x * x + y * y;

        if z <= 0.5 {
            Rgba(0, 0, 0, 255)
        } else if z <= 0.505 {
            Rgba(0, 255, 0, 255)
        } else {
            Rgba(255, 255, 255, 255)
        }
    });

    match png_framing::save(&Chunky::new(image), "circle.png") {
        Ok(_) => println!("Image saved to `circle.png`!"),
        Err(_) => println!("Could not save image.")
    }
}