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| extern crate rand; | |
| use rand::Rng; | |
| use std::io::Write; | |
| use std::ops::{Index,IndexMut}; | |
| use std::fs; | |
| struct Config { | |
| inner_size: usize, | |
| outer_size: usize, | |
| incr_amt: f32, | |
| decr_amt: f32, | |
| steps: usize, | |
| img_size: usize, | |
| } | |
| fn clamp(low: f32, high: f32, num: f32) -> f32 { | |
| if num < low { | |
| low | |
| } else if num > high { | |
| high | |
| } else { | |
| num | |
| } | |
| } | |
| struct Image { | |
| sz: usize, | |
| px: Vec<f32>, | |
| } | |
| impl Image { | |
| fn new(sz: usize) -> Image { | |
| let mut v = Vec::new(); | |
| for _ in 0..(sz*sz) { | |
| v.push(0.0); | |
| } | |
| Image { sz: sz, px: v } | |
| } | |
| fn new_rand(sz: usize) -> Image { | |
| let mut rng = rand::thread_rng(); | |
| let mut v = Vec::new(); | |
| for _ in 0..(sz*sz) { | |
| v.push(rng.gen()); | |
| } | |
| Image { sz: sz, px: v } | |
| } | |
| fn dim(&self) -> usize { | |
| self.sz | |
| } | |
| fn print(&self, mut f: fs::File) { | |
| writeln!(f, "P2\n{} {}\n128", self.dim(), self.dim()); | |
| for x in 0..self.dim() { | |
| for y in 0..self.dim() { | |
| writeln!(f, "{} ", (self[(x,y)] * 128.0).floor()); | |
| } | |
| writeln!(f, ""); | |
| } | |
| } | |
| } | |
| impl Index<(usize, usize)> for Image { | |
| type Output = f32; | |
| fn index<'a>(&'a self, (x, y): (usize, usize)) -> &'a f32 { | |
| &self.px[x * self.sz + y] | |
| } | |
| } | |
| impl IndexMut<(usize, usize)> for Image { | |
| fn index_mut<'a>(&'a mut self, (x, y): (usize, usize)) -> &'a mut f32 { | |
| &mut self.px[x * self.sz + y] | |
| } | |
| } | |
| fn run_step(old: &Image, new: &mut Image, conf: &Config) { | |
| for x in 0..conf.img_size { | |
| for y in 0..conf.img_size { | |
| if gather_neighbors(old, (x, y), conf.inner_size) > | |
| gather_neighbors(old, (x, y), conf.outer_size) { | |
| new[(x,y)] = clamp(0.0, 1.0, old[(x,y)] + conf.incr_amt) | |
| } else { | |
| new[(x,y)] = clamp(0.0, 1.0, old[(x,y)] - conf.decr_amt) | |
| } | |
| } | |
| } | |
| } | |
| fn gather_neighbors(img: &Image, (x, y): (usize, usize), n: usize) -> f32 { | |
| let mut amt = 0.0; | |
| let mut tot = 0.0; | |
| let ns = n as isize; | |
| for i in -ns..ns { | |
| for j in -ns..ns { | |
| let xn = (i + x as isize) as usize; | |
| let yn = (j + y as isize) as usize; | |
| if xn > 0 && xn < img.dim() && yn > 0 && yn < img.dim() { | |
| amt += img[(xn,yn)]; | |
| tot += 1.0; | |
| } | |
| } | |
| } | |
| amt / tot | |
| } | |
| fn main() { | |
| for isize in 2..10 { | |
| for osize in (isize+2)..12 { | |
| let conf = Config { | |
| inner_size: isize*2, | |
| outer_size: osize*2, | |
| incr_amt: 0.05, | |
| decr_amt: 0.05, | |
| steps: 100, | |
| img_size: 256, | |
| }; | |
| let filename = format!("output/morph-m-{}-{}.pbm", isize*2, osize*2); | |
| println!("Printing to {:?}", filename); | |
| let mut old = Image::new_rand(conf.img_size); | |
| let mut new = Image::new(conf.img_size); | |
| for _ in 0..conf.steps { | |
| run_step(&old, &mut new, &conf); | |
| std::mem::swap(&mut new, &mut old); | |
| } | |
| let mut f = match fs::File::create(filename) { | |
| Ok(f) => f, | |
| _ => panic!("Unable to open file"), | |
| }; | |
| new.print(f); | |
| } | |
| } | |
| } |
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