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// cargo-deps: hsl, image, csv = "1.0.0-beta.4", serde, serde_derive
extern crate hsl;
extern crate image;
extern crate csv;
extern crate serde;
#[macro_use]
extern crate serde_derive;
use std::io;
#[derive(Debug, Deserialize)]
#[serde(rename_all = "camelCase")]
struct Tile {
tile_x: usize,
tile_y: usize,
create_time: u64,
modify_count: u64,
modify_time: u64,
access_count: u64,
access_time: u64
}
const W: u32 = 512;
fn main() {
let mut rdr = csv::Reader::from_reader(io::stdin());
let mut ma = 0.0f32;
let mut mm = 0.0f32;
let mut tiles = [[(0.0f32, 0.0f32); W as usize]; W as usize];
for tile in rdr.deserialize().map(Result::<Tile, _>::unwrap) {
let a = tile.access_count as f32;
let m = tile.modify_count as f32;
if (tile.tile_x, tile.tile_y) != (0, 0) {
ma = ma.max(a);
mm = mm.max(m);
}
tiles[tile.tile_y][tile.tile_x] = (a, m);
}
let mut heatmap = image::ImageBuffer::new(W * 4, W);
let green = hsl::HSL::from_rgb(&[0, 255, 0]).h;
let red = hsl::HSL::from_rgb(&[255, 0, 0]).h;
for y in 0..W {
for x in 0..W {
let (a, m) = tiles[y as usize][x as usize];
let a = (a / ma).min(1.0).powf(0.2) as f64;
let m = (m / mm).min(1.0).powf(0.2) as f64;
let l = a.max(m) * 0.5;
let h = green * (1.0 - m) + red * m;
let (r, g, b) = hsl::HSL { h, s: 1.0, l }.to_rgb();
let rgb = image::Rgb([r, g, b]);
let y = (y + W / 2) % W;
for dx in 0..4 {
let x = (x * 4 + dx + (W - 1) * 2) % (W * 4);
heatmap.put_pixel(x, y, rgb);
}
}
}
heatmap.save("heatmap.png").unwrap();
}
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