arloader 0.1.63

Command line application and library for uploading files to Arweave.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141

use arloader::{commands::*, error::Error};
use image::Rgb;
use imageproc::drawing::draw_text;
use rand::Rng;
use rayon::prelude::*;
use rusttype::{Font, Scale};
use std::fs;
use std::path::PathBuf;

#[tokio::main]
async fn main() -> CommandResult {
    // Generate images and metadata.
    println!("\n\nCreating images...\n");
    files_setup(10, 1280, 640, 44, "arloader", 156.0)?;

    Ok(())
}

fn files_setup(
    num_nfts: i32,
    width: u32,
    height: u32,
    iters: usize,
    text: &str,
    font_size: f32,
) -> Result<PathBuf, Error> {
    let temp_dir = PathBuf::from("target/examples/repo_image");
    fs::create_dir_all(&temp_dir)?;

    let font = Vec::from(include_bytes!("../tests/fixtures/OpenSans-Semibold.ttf") as &[u8]);
    let font = Font::try_from_vec(font).unwrap();
    let mut rng = rand::thread_rng();

    let _ = (0..num_nfts).into_iter().for_each(|i| {
        let cx: f64 = rng.gen_range(-0.9..-0.3);
        let cy: f64 = rng.gen_range(0.5..0.6);

        generate_image(
            temp_dir.join(format!("{}.png", i)),
            width,
            height,
            cx,
            cy,
            iters,
            text,
            &font,
            font_size,
        );
    });
    Ok(temp_dir)
}

fn generate_image(
    file_path: PathBuf,
    width: u32,
    height: u32,
    cx: f64,
    cy: f64,
    iters: usize,
    text: &str,
    font: &Font,
    font_size: f32,
) {
    let imgbuf = generate_julia_fractal(width, height, cx, cy, iters);
    let imgbuf = add_text(text, font, width / 2 - 30, height / 2, font_size, imgbuf);
    imgbuf.save(file_path).unwrap();
}

fn generate_julia_fractal(
    width: u32,
    height: u32,
    cx: f64,
    cy: f64,
    iters: usize,
) -> image::RgbImage {
    let mut image = image::ImageBuffer::new(width, height);
    let c = num_complex::Complex64::new(cx as f64, cy);

    image.par_chunks_mut(3).enumerate().for_each(|(i, p)| {
        let (x, y) = index_to_coordinates(i as u32, width);
        let inner_height = height as f64;
        let inner_width = width as f64;
        let inner_y = y as f64;
        let inner_x = x as f64;

        let zx = 2.0 * (inner_x - 0.7 * inner_width) / (inner_width * 1.4);
        let zy = 1.3 * (inner_y - 0.3 * inner_height) / (inner_height * 1.4);

        let mut i = iters;

        let mut z = num_complex::Complex64::new(zx, zy);
        while (z + z).re <= 4.0 && i > 1 {
            z = z * z + c;
            i -= 1;
        }

        let r = (i << 4) as u8;
        let g = (i << 6) as u8;
        let b = (i * 3) as u8;
        let pixel = into_rgb(r, g, b);
        p.copy_from_slice(&pixel);
    });

    image
}

fn index_to_coordinates(idx: u32, length: u32) -> (u32, u32) {
    let x = idx % length;
    let y = idx / length;
    (x, y)
}

fn into_rgb(r: u8, g: u8, b: u8) -> [u8; 3] {
    [r, g, b]
}

fn add_text(
    text: &str,
    font: &Font,
    x: u32,
    y: u32,
    height: f32,
    mut imgbuf: image::ImageBuffer<Rgb<u8>, Vec<u8>>,
) -> image::RgbImage {
    let scale = Scale {
        x: height,
        y: height,
    };

    let imgbuf = draw_text(
        &mut imgbuf,
        Rgb([255u8, 255u8, 255u8]),
        x,
        y,
        scale,
        &font,
        &text,
    );

    imgbuf
}