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extern crate vec2d;
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use std::cmp;
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pub struct Land2D<T> {
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pixels: vec2d::Vec2D<T>,
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width_mask: usize,
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height_mask: usize,
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}
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13929
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impl<T: Default + Copy + PartialEq> Land2D<T> {
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13922
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pub fn new(width: usize, height: usize) -> Self {
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assert!(width.is_power_of_two());
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assert!(height.is_power_of_two());
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Self {
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pixels: vec2d::Vec2D::new(width, height, T::default()),
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width_mask: !(width - 1),
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height_mask: !(height - 1),
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}
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}
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#[inline]
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pub fn width(&self) -> usize {
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self.pixels.width()
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}
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#[inline]
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pub fn height(&self) -> usize {
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self.pixels.height()
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}
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#[inline]
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pub fn is_valid_coordinate(&self, x: i32, y: i32) -> bool {
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(x as usize & self.width_mask) == 0 && (y as usize & self.height_mask) == 0
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}
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#[inline]
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pub fn map<U, F: FnOnce(&mut T) -> U>(&mut self, y: i32, x: i32, f: F) {
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if self.is_valid_coordinate(x, y) {
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self.pixels.get_mut(y as usize, x as usize).map(f);
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}
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}
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pub fn draw_line(&mut self, x1: i32, y1: i32, x2: i32, y2: i32, value: T) {
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let mut e_x: i32 = 0;
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let mut e_y: i32 = 0;
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let mut d_x: i32 = x2 - x1;
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let mut d_y: i32 = y2 - y1;
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let s_x: i32;
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let s_y: i32;
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if d_x > 0 {
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s_x = 1;
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} else if d_x < 0 {
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s_x = -1;
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d_x = -d_x;
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} else {
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s_x = d_x;
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}
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if d_y > 0 {
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s_y = 1;
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} else if d_y < 0 {
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s_y = -1;
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d_y = -d_y;
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} else {
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s_y = d_y;
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}
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let d = cmp::max(d_x, d_y);
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let mut x = x1;
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let mut y = y1;
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for _i in 0..=d {
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e_x += d_x;
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e_y += d_y;
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if e_x > d {
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e_x -= d;
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x += s_x;
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}
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if e_y > d {
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e_y -= d;
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y += s_y;
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}
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self.map(y, x, |p| *p = value);
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}
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}
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pub fn fill(&mut self, start_x: i32, start_y: i32, border_value: T, fill_value: T) {
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debug_assert!(self.is_valid_coordinate(start_x - 1, start_y));
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debug_assert!(self.is_valid_coordinate(start_x, start_y));
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let mut stack: Vec<(usize, usize, usize, isize)> = Vec::new();
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fn push<T: Default + Copy + PartialEq>(
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land: &Land2D<T>,
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stack: &mut Vec<(usize, usize, usize, isize)>,
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xl: usize,
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xr: usize,
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y: usize,
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dir: isize,
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) {
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let yd = y as isize + dir;
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if land.is_valid_coordinate(0, yd as i32) {
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stack.push((xl, xr, yd as usize, dir));
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}
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};
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let start_x_l = (start_x - 1) as usize;
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let start_x_r = start_x as usize;
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push(self, &mut stack, start_x_l, start_x_r, start_y as usize, -1);
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push(self, &mut stack, start_x_l, start_x_r, start_y as usize, 1);
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loop {
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let a = stack.pop();
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match a {
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None => return,
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Some(a) => {
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let (mut xl, mut xr, y, mut dir) = a;
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while xl > 0 && self
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.pixels
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.get(y, xl)
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.map_or(false, |v| *v != border_value && *v != fill_value)
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{
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xl -= 1;
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}
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while xr < self.width() - 1 && self
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.pixels
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.get(y, xr)
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.map_or(false, |v| *v != border_value && *v != fill_value)
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{
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xr += 1;
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}
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while xl < xr {
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while xl <= xr
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&& (self.pixels[y][xl] == border_value
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|| self.pixels[y][xl] == fill_value)
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{
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xl += 1;
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}
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let mut x = xl;
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while xl <= xr
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&& (self.pixels[y][xl] != border_value
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&& self.pixels[y][xl] != fill_value)
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{
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self.pixels[y][xl] = fill_value;
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xl += 1;
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}
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if x < xl {
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push(self, &mut stack, x, xl - 1, y, dir);
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push(self, &mut stack, x, xl - 1, y, -dir);
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}
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}
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}
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}
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn basics() {
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let l: Land2D<u8> = Land2D::new(32, 64);
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assert!(l.is_valid_coordinate(0, 0));
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assert!(!l.is_valid_coordinate(-1, -1));
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assert!(l.is_valid_coordinate(31, 63));
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assert!(!l.is_valid_coordinate(32, 63));
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assert!(!l.is_valid_coordinate(31, 64));
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}
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#[test]
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fn fill() {
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let mut l: Land2D<u8> = Land2D::new(128, 128);
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l.draw_line(0, 0, 32, 96, 1);
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l.draw_line(32, 96, 64, 32, 1);
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l.draw_line(64, 32, 96, 80, 1);
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l.draw_line(96, 80, 128, 0, 1);
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l.draw_line(0, 128, 64, 96, 1);
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l.draw_line(128, 128, 64, 96, 1);
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l.fill(32, 32, 1, 2);
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l.fill(16, 96, 1, 3);
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l.fill(60, 100, 1, 4);
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assert_eq!(l.pixels[0][0], 1);
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assert_eq!(l.pixels[96][64], 1);
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assert_eq!(l.pixels[40][32], 2);
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assert_eq!(l.pixels[40][96], 2);
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assert_eq!(l.pixels[5][0], 3);
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assert_eq!(l.pixels[120][0], 3);
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assert_eq!(l.pixels[5][127], 3);
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assert_eq!(l.pixels[120][127], 3);
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assert_eq!(l.pixels[35][64], 3);
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assert_eq!(l.pixels[120][20], 4);
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assert_eq!(l.pixels[120][100], 4);
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assert_eq!(l.pixels[100][64], 4);
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}
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}
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