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|
use rand::Rng;
use std::vec;
pub struct Config {
pub height: u16,
pub width: u16,
pub frames: u16,
pub out_file: String,
}
impl Config {
pub fn build(mut args: impl Iterator<Item = String>) -> Result<Self, &'static str> {
args.next();
let width: u16 = match args.next() {
Some(arg) => match arg.parse() {
Ok(num) => num,
Err(_) => return Err("Width is not a number"),
},
None => return Err("Didn't get a width"),
};
let height: u16 = match args.next() {
Some(arg) => match arg.parse() {
Ok(num) => num,
Err(_) => return Err("Height is not a number"),
},
None => return Err("Didn't get a height"),
};
let frames: u16 = match args.next() {
Some(arg) => match arg.parse() {
Ok(num) => num,
Err(_) => return Err("Frames is not a number"),
},
None => return Err("Didn't get a frame count"),
};
let out_file = match args.next() {
Some(arg) => arg,
None => return Err("Didn't get an output file"),
};
Ok(Config {
height,
width,
frames,
out_file,
})
}
}
#[derive(Clone)]
struct PointData {
min_dist: f64,
closest_point: Point,
}
impl PointData {
fn get_point_data(gif: &Gif, p: Point) -> Self {
let mut pd = PointData {
min_dist: gif.cross_distance,
closest_point: Point { x: 0, y: 0 },
};
for point in &gif.points {
let d = distance(&p, point);
if d < pd.min_dist {
pd.min_dist = d;
pd.closest_point = point.clone();
}
}
pd
}
}
pub struct Gif {
pub height: u16,
pub width: u16,
pub frames: u16,
pub pixels: Vec<u8>,
point_data: Vec<PointData>,
cross_distance: f64,
points: Vec<Point>,
}
impl Gif {
pub fn create_from_config(config: &Config, num_cells: usize) -> Self {
Gif {
height: config.height,
width: config.width,
frames: config.frames,
pixels: vec![0; config.height as usize * config.width as usize * 3],
point_data: vec![
PointData {
min_dist: 0.0,
closest_point: Point { x: 0, y: 0 }
};
config.height as usize * config.width as usize
],
cross_distance: distance(
&Point { x: 0, y: 0 },
&Point {
x: config.width - 1,
y: config.height - 1,
},
),
points: generate_points(config.width, config.height, num_cells),
}
}
}
#[derive(Clone)]
struct Point {
pub x: u16,
pub y: u16,
}
pub fn fill_canvas(gif: &mut Gif) {
generate_noise(gif);
}
fn set_pixel(gif: &mut Gif, r: u8, g: u8, b: u8, x: u16, y: u16) {
gif.pixels[3 * (gif.width as usize * y as usize + x as usize)] = r;
gif.pixels[3 * (gif.width as usize * y as usize + x as usize) + 1] = g;
gif.pixels[3 * (gif.width as usize * y as usize + x as usize) + 2] = b;
}
fn generate_noise(gif: &mut Gif) {
let mut max_dist = 0.0;
// Get distance and nearest point for each point on the canvas
for y in 0..gif.height {
for x in 0..gif.width {
let index = y as usize * gif.width as usize + x as usize;
gif.point_data[index] = PointData::get_point_data(gif, Point { x, y });
max_dist = f64::max(max_dist, gif.point_data[index].min_dist);
}
}
// normalize distances to [0,1]
for y in 0..gif.height {
for x in 0..gif.width {
let index = y as usize * gif.width as usize + x as usize;
gif.point_data[index].min_dist /= max_dist;
}
}
for y in 0..gif.height {
for x in 0..gif.width {
let index = y as usize * gif.width as usize + x as usize;
let val = 0xFF - (0xFF as f64 * gif.point_data[index].min_dist) as u8;
set_pixel(gif, val, val, val, x, y)
}
}
}
fn generate_points(width: u16, height: u16, num_cells: usize) -> Vec<Point> {
let mut points = vec![Point { x: 0, y: 0 }; num_cells];
for p in &mut points {
p.x = rand::thread_rng().gen_range(0..width);
p.y = rand::thread_rng().gen_range(0..height);
}
points
}
fn distance(p1: &Point, p2: &Point) -> f64 {
let x_dist: f64 = p2.x as f64 - p1.x as f64;
let y_dist: f64 = p2.y as f64 - p1.y as f64;
(x_dist * x_dist + y_dist * y_dist).sqrt()
}
|
