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use plotters::element::{Drawable, PointCollection};
use plotters::prelude::*;
use plotters::style::SizeDesc;
use plotters_backend::{BackendCoord, DrawingErrorKind};
#[derive(Clone)]
pub struct ThinArrow<Coord, Size: SizeDesc> {
points: [Coord; 2],
head: Size,
width: Size,
style: ShapeStyle,
}
impl<Coord> ThinArrow<Coord, i32> {
pub fn new(nock: Coord, tip: Coord, style: impl Into<ShapeStyle>) -> Self {
Self {
points: [nock, tip],
head: 5,
width: 5,
style: style.into(),
}
}
}
impl<Coord, Size: SizeDesc> ThinArrow<Coord, Size> {
pub fn new_detail(
nock: Coord,
tip: Coord,
head: Size,
width: Size,
style: impl Into<ShapeStyle>,
) -> Self {
Self {
points: [nock, tip],
head,
width,
style: style.into(),
}
}
pub fn head(self, head: Size) -> Self {
Self { head, ..self }
}
pub fn width(self, width: Size) -> Self {
Self { width, ..self }
}
}
impl<'a, Coord: 'a, Size: SizeDesc> PointCollection<'a, Coord> for &'a ThinArrow<Coord, Size> {
type Point = &'a Coord;
type IntoIter = &'a [Coord];
fn point_iter(self) -> Self::IntoIter {
&self.points
}
}
impl<DB: DrawingBackend, Coord, Size: SizeDesc> Drawable<DB> for ThinArrow<Coord, Size> {
fn draw<I: Iterator<Item = BackendCoord>>(
&self,
mut pos: I,
backend: &mut DB,
parent_dim: (u32, u32),
) -> Result<(), DrawingErrorKind<DB::ErrorType>> {
let nock = pos.next();
let tip = pos.next();
debug_assert!(nock.is_some());
debug_assert!(tip.is_some());
if let (Some(nock), Some(tip)) = (nock, tip) {
let head = self.head.in_pixels(&parent_dim) as f64;
let width = self.width.in_pixels(&parent_dim) as f64;
if nock != tip {
let dx = (tip.0 - nock.0) as f64;
let dy = (tip.1 - nock.1) as f64;
let d = f64::sqrt(dx * dx + dy * dy);
let head = head.min(d);
let width = width.min(d);
let half_width = width * 0.5;
let left = (
tip.0 + ((-head * dx + half_width * dy) / d) as i32,
tip.1 + ((-head * dy - half_width * dx) / d) as i32,
);
let right = (
tip.0 + ((-head * dx - half_width * dy) / d) as i32,
tip.1 + ((-head * dy + half_width * dx) / d) as i32,
);
backend.draw_line(nock, tip, &self.style)?;
backend.draw_line(tip, left, &self.style)?;
backend.draw_line(tip, right, &self.style)?;
}
}
Ok(())
}
}
#[derive(Clone)]
pub struct TriangleArrow<Coord, Size: SizeDesc> {
points: [Coord; 2],
head: Size,
width: Size,
style: ShapeStyle,
}
impl<Coord> TriangleArrow<Coord, i32> {
pub fn new(nock: Coord, tip: Coord, style: impl Into<ShapeStyle>) -> Self {
Self {
points: [nock, tip],
head: 5,
width: 5,
style: style.into(),
}
}
}
impl<Coord, Size: SizeDesc> TriangleArrow<Coord, Size> {
pub fn new_detail(
nock: Coord,
tip: Coord,
head: Size,
width: Size,
style: impl Into<ShapeStyle>,
) -> Self {
Self {
points: [nock, tip],
head,
width,
style: style.into(),
}
}
pub fn head(self, head: Size) -> Self {
Self { head, ..self }
}
pub fn width(self, width: Size) -> Self {
Self { width, ..self }
}
}
impl<'a, Coord: 'a, Size: SizeDesc> PointCollection<'a, Coord> for &'a TriangleArrow<Coord, Size> {
type Point = &'a Coord;
type IntoIter = &'a [Coord];
fn point_iter(self) -> Self::IntoIter {
&self.points
}
}
impl<DB: DrawingBackend, Coord, Size: SizeDesc> Drawable<DB> for TriangleArrow<Coord, Size> {
fn draw<I: Iterator<Item = BackendCoord>>(
&self,
mut pos: I,
backend: &mut DB,
parent_dim: (u32, u32),
) -> Result<(), DrawingErrorKind<DB::ErrorType>> {
let nock = pos.next();
let tip = pos.next();
debug_assert!(nock.is_some());
debug_assert!(tip.is_some());
if let (Some(nock), Some(tip)) = (nock, tip) {
let head = self.head.in_pixels(&parent_dim) as f64;
let width = self.width.in_pixels(&parent_dim) as f64;
if nock != tip {
let dx = (tip.0 - nock.0) as f64;
let dy = (tip.1 - nock.1) as f64;
let d = f64::sqrt(dx * dx + dy * dy);
let head = head.min(d);
let width = width.min(d);
let half_width = width * 0.5;
let left = (
tip.0 + ((-head * dx + half_width * dy) / d) as i32,
tip.1 + ((-head * dy - half_width * dx) / d) as i32,
);
let right = (
tip.0 + ((-head * dx - half_width * dy) / d) as i32,
tip.1 + ((-head * dy + half_width * dx) / d) as i32,
);
backend.draw_line(nock, tip, &self.style)?;
backend.fill_polygon(vec![tip, left, right, tip], &self.style)?;
}
}
Ok(())
}
}