rust/land2d/src/lib.rs
author unc0rr
Wed, 17 Oct 2018 22:00:58 +0200
changeset 13955 9c112f2ae02d
parent 13952 9230aed8a32e
child 13957 78c798d655ad
permissions -rw-r--r--
Raise levels of abstraction to implement draw_thick_line() avoiding code duplication
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extern crate vec2d;
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use std::cmp;
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use std::ops;
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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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impl<T: Copy + PartialEq> Land2D<T> {
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    pub fn new(width: usize, height: usize, fill_value: T) -> 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, fill_value),
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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_x(&self, x: i32) -> bool {
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        (x as usize & self.width_mask) == 0
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    }
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    #[inline]
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    pub fn is_valid_y(&self, y: i32) -> bool {
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        (y as usize & self.height_mask) == 0
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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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        self.is_valid_x(x) && self.is_valid_y(y)
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    }
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    #[inline]
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    pub fn map<U: Default, F: FnOnce(&mut T) -> U>(&mut self, y: i32, x: i32, f: F) -> U {
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        if self.is_valid_coordinate(x, y) {
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            unsafe {
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                // hey, I just checked that coordinates are valid!
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                f(self.pixels.get_unchecked_mut(y as usize, x as usize))
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            }
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        } else {
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            U::default()
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        }
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    }
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    fn apply_along_line<U: Default + ops::AddAssign, F: FnMut(i32, i32) -> U>(
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        x1: i32,
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        y1: i32,
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        x2: i32,
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        y2: i32,
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        f: &mut F,
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    ) -> U {
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        let mut result = U::default();
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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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            result += f(x, y);
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        }
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        result
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    }
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    fn apply_around_circle<U: Default + ops::AddAssign, F: FnMut(i32, i32) -> U>(
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        radius: i32,
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        f: &mut F,
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    ) -> U {
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        let mut dx: i32 = 0;
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        let mut dy: i32 = radius;
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        let mut d = 3 - 2 * radius;
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        let mut result = U::default();
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        while dx < dy {
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            result += f(dx, dy);
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            if d < 0 {
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                d += 4 * dx + 6;
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            } else {
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                d += 4 * (dx - dy) + 10;
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                dy -= 1;
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            }
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            dx += 1;
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        }
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        if dx == dy {
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            result += f(dx, dy);
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        }
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        result
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    }
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    pub fn draw_line(&mut self, x1: i32, y1: i32, x2: i32, y2: i32, value: T) -> usize {
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        <Land2D<T>>::apply_along_line(x1, y1, x2, y2, &mut |x, y| {
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            self.map(y, x, |p| *p = value);
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            1
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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: 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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    #[inline]
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    fn fill_circle_line<F: Fn(&mut T) -> usize>(
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        &mut self,
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        y: i32,
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        x_from: i32,
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        x_to: i32,
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        f: &F,
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    ) -> usize {
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        let mut result = 0;
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        if self.is_valid_y(y) {
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            for i in cmp::min(x_from, 0) as usize..cmp::max(x_to as usize, self.width() - 1) {
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                unsafe {
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                    // coordinates are valid at this point
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                    result += f(self.pixels.get_unchecked_mut(y as usize, i));
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                }
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            }
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        }
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        result
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    }
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    #[inline]
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    fn fill_circle_lines<F: Fn(&mut T) -> usize>(
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        &mut self,
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        x: i32,
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        y: i32,
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        dx: i32,
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        dy: i32,
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        f: &F,
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    ) -> usize {
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        self.fill_circle_line(y + dy, x - dx, x + dx, f)
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            + self.fill_circle_line(y - dy, x - dx, x + dx, f)
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            + self.fill_circle_line(y + dx, x - dy, x + dy, f)
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            + self.fill_circle_line(y - dx, x - dy, x + dy, f)
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    }
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    pub fn change_round<F: Fn(&mut T) -> usize>(
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        &mut self,
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        x: i32,
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        y: i32,
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        radius: i32,
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        f: F,
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    ) -> usize {
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        <Land2D<T>>::apply_around_circle(radius, &mut |dx, dy| {
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            self.fill_circle_lines(x, y, dx, dy, &f)
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        })
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    }
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    #[inline]
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    fn change_dots_around<U: Default + ops::AddAssign, F: FnMut(i32, i32) -> U>(
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        x: i32,
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        y: i32,
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        xx: i32,
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        yy: i32,
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        f: &mut F,
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   288
    ) -> U {
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        let mut result = U::default();
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        result += f(y + yy, x + xx);
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        result += f(y - yy, x + xx);
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        result += f(y + yy, x - xx);
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        result += f(y - yy, x - xx);
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        result += f(y + xx, x + yy);
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        result += f(y - xx, x + yy);
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        result += f(y + xx, x - yy);
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        result += f(y - xx, x - yy);
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        result
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    }
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    pub fn draw_thick_line(
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   303
        &mut self,
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        x1: i32,
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        y1: i32,
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        x2: i32,
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        y2: i32,
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        radius: i32,
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        value: T,
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   310
    ) -> usize {
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   311
        <Land2D<T>>::apply_around_circle(radius, &mut |dx, dy| {
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            <Land2D<T>>::apply_along_line(x1, y1, x2, y2, &mut |x, y| {
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                <Land2D<T>>::change_dots_around(x, y, dx, dy, &mut |x, y| {
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                    self.map(x, y, |p| {
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                        if *p != value {
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                            *p = value;
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                            1
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                        } else {
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                            0
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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, 0);
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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, 0);
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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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}