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|
use std::{
convert::{From, Into, TryFrom},
ops::{Add, Sub},
};
#[derive(Debug)]
pub struct Pixmap<T> {
pub width: u32,
pub height: u32,
pub data: Vec<T>,
}
#[derive(Copy, Clone, Debug)]
pub struct MapPoint {
pub x: u32,
pub y: u32,
}
impl From<(u32, u32)> for MapPoint {
fn from((x, y): (u32, u32)) -> MapPoint {
MapPoint { x, y }
}
}
impl TryFrom<(i32, i32)> for MapPoint {
type Error = ();
fn try_from((x, y): (i32, i32)) -> Result<Self, Self::Error> {
if x < 0 || y < 0 {
return Err(());
} else {
Ok(MapPoint {
x: x as u32,
y: y as u32,
})
}
}
}
impl TryFrom<(i64, i64)> for MapPoint {
type Error = ();
fn try_from((x, y): (i64, i64)) -> Result<Self, Self::Error> {
if x < 0 || y < 0 {
return Err(());
} else {
Ok(MapPoint {
x: x as u32,
y: y as u32,
})
}
}
}
impl Add for MapPoint {
type Output = Self;
fn add(self, rhs: Self) -> Self::Output {
MapPoint {
x: self.x + rhs.x,
y: self.y + rhs.y,
}
}
}
impl Sub for MapPoint {
type Output = Self;
fn sub(self, rhs: Self) -> Self::Output {
MapPoint {
x: self.x - rhs.x,
y: self.y - rhs.y,
}
}
}
#[derive(Debug, Copy, Clone)]
pub enum Axis {
X,
Y,
}
impl MapPoint {
#[inline]
pub fn scale(self, c: u32) -> MapPoint {
MapPoint {
x: self.x * c,
y: self.y * c,
}
}
#[inline]
pub fn mirror_about(self, line: u32, axis: Axis) -> MapPoint {
let MapPoint { x, y } = self;
match axis {
Axis::X => MapPoint { x, y: 2 * line - y },
Axis::Y => MapPoint { x: 2 * line - x, y },
}
}
#[inline]
pub fn reflect(self, around: MapPoint) -> MapPoint {
around.scale(2) - self
}
}
impl<T> Pixmap<T>
where
T: Copy + Clone + Default,
{
pub fn new(width: u32, height: u32) -> Self {
let data = vec![Default::default(); (width * height) as usize];
Pixmap {
width,
height,
data,
}
}
pub fn new_with(width: u32, height: u32, data: Vec<T>) -> Self {
Pixmap {
width,
height,
data,
}
}
pub fn is_inside<P: Into<MapPoint>>(&self, pt: P) -> bool {
let MapPoint { x, y } = pt.into();
x < self.width && y < self.height
}
pub fn idx<P: Into<MapPoint>>(&self, pt: P) -> usize {
let MapPoint { x, y } = pt.into();
(y * self.width + x) as usize
}
pub fn get<P: Into<MapPoint>>(&self, pt: P) -> T {
let idx = self.idx(pt);
self.data[idx]
}
pub fn set<P: Into<MapPoint>>(&mut self, pt: P, new_val: T) -> T {
let pt = pt.into();
let old_val = self.get(pt);
let idx = self.idx(pt);
self.data[idx] = new_val;
old_val
}
pub fn get_circle<P: Into<MapPoint>>(
&self,
center: P,
radius: u32,
filled: bool,
) -> Vec<MapPoint> {
let mut circle: Vec<(i64, i64)> = vec![];
let MapPoint { x, y } = center.into();
let x = x as i64;
let y = y as i64;
let (mut dx, mut dy, mut err) = (radius as i64, 0i64, 1 - radius as i64);
while dx >= dy {
circle.push((x + dx, y + dy));
circle.push((x - dx, y + dy));
circle.push((x + dx, y - dy));
circle.push((x - dx, y - dy));
circle.push((x + dy, y + dx));
circle.push((x - dy, y + dx));
circle.push((x + dy, y - dx));
circle.push((x - dy, y - dx));
if filled {
circle.extend((x - dx.abs() + 1..x + dx.abs()).map(|x| (x, y + dy)));
circle.extend((x - dx.abs() + 1..x + dx.abs()).map(|x| (x, y - dy)));
circle.extend((x - dy.abs() + 1..x + dy.abs()).map(|x| (x, y + dx)));
circle.extend((x - dy.abs() + 1..x + dy.abs()).map(|x| (x, y - dx)));
}
dy = dy + 1;
if err < 0 {
err = err + 2 * dy + 1;
} else {
dx -= 1;
err += 2 * (dy - dx) + 1;
}
}
circle
.into_iter()
.flat_map(|pt| MapPoint::try_from(pt))
.filter(|&pt| self.is_inside(pt))
.collect()
}
pub fn get_line<P: Into<MapPoint>>(&self, start: P, end: P) -> Vec<MapPoint> {
let MapPoint { x: x1, y: y1 } = start.into();
let MapPoint { x: x2, y: y2 } = end.into();
let mut coordinates = vec![];
let dx = abs_difference(x1, x2) as i64;
let dy = abs_difference(y1, y2) as i64;
let sx = {
if x1 < x2 {
1
} else {
-1
}
};
let sy = {
if y1 < y2 {
1
} else {
-1
}
};
let mut err: i64 = dx - dy;
let mut current_x = x1 as i64;
let mut current_y = y1 as i64;
loop {
coordinates.push((current_x, current_y));
if current_x == x2 as i64 && current_y == y2 as i64 {
break;
}
let e2 = 2 * err;
if e2 > -dy {
err -= dy;
current_x += sx;
}
if e2 < dx {
err += dx;
current_y += sy;
}
}
coordinates
.into_iter()
.flat_map(|pt| MapPoint::try_from(pt))
.filter(|&pt| self.is_inside(pt))
.collect()
}
}
fn abs_difference<T: Sub<Output = T> + Ord>(x: T, y: T) -> T {
if x < y {
y - x
} else {
x - y
}
}
pub fn mirror_figure(figure: &[MapPoint], line: u32, axis: Axis) -> Vec<MapPoint> {
figure
.iter()
.map(|pt| pt.mirror_about(line, axis))
.collect()
}
pub fn reflect_figure(figure: &[MapPoint], around: MapPoint) -> Vec<MapPoint> {
figure.iter().map(|pt| pt.reflect(around)).collect()
}
|
