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use std::marker::PhantomData; use crate::element::{Drawable, PointCollection}; use crate::style::ShapeStyle; use plotters_backend::{BackendCoord, DrawingBackend, DrawingErrorKind}; pub trait ErrorBarOrient<K, V> { type XType; type YType; fn make_coord(key: K, val: V) -> (Self::XType, Self::YType); fn ending_coord(coord: BackendCoord, w: u32) -> (BackendCoord, BackendCoord); } pub struct ErrorBarOrientH<K, V>(PhantomData<(K, V)>); pub struct ErrorBarOrientV<K, V>(PhantomData<(K, V)>); impl<K, V> ErrorBarOrient<K, V> for ErrorBarOrientH<K, V> { type XType = V; type YType = K; fn make_coord(key: K, val: V) -> (V, K) { (val, key) } fn ending_coord(coord: BackendCoord, w: u32) -> (BackendCoord, BackendCoord) { ( (coord.0, coord.1 - w as i32 / 2), (coord.0, coord.1 + w as i32 / 2), ) } } impl<K, V> ErrorBarOrient<K, V> for ErrorBarOrientV<K, V> { type XType = K; type YType = V; fn make_coord(key: K, val: V) -> (K, V) { (key, val) } fn ending_coord(coord: BackendCoord, w: u32) -> (BackendCoord, BackendCoord) { ( (coord.0 - w as i32 / 2, coord.1), (coord.0 + w as i32 / 2, coord.1), ) } } pub struct ErrorBar<K, V, O: ErrorBarOrient<K, V>> { style: ShapeStyle, width: u32, key: K, values: [V; 3], _p: PhantomData<O>, } impl<K, V> ErrorBar<K, V, ErrorBarOrientV<K, V>> { pub fn new_vertical<S: Into<ShapeStyle>>( key: K, min: V, avg: V, max: V, style: S, width: u32, ) -> Self { Self { style: style.into(), width, key, values: [min, avg, max], _p: PhantomData, } } } impl<K, V> ErrorBar<K, V, ErrorBarOrientH<K, V>> { pub fn new_horizontal<S: Into<ShapeStyle>>( key: K, min: V, avg: V, max: V, style: S, width: u32, ) -> Self { Self { style: style.into(), width, key, values: [min, avg, max], _p: PhantomData, } } } impl<'a, K: Clone, V: Clone, O: ErrorBarOrient<K, V>> PointCollection<'a, (O::XType, O::YType)> for &'a ErrorBar<K, V, O> { type Point = (O::XType, O::YType); type IntoIter = Vec<Self::Point>; fn point_iter(self) -> Self::IntoIter { self.values .iter() .map(|v| O::make_coord(self.key.clone(), v.clone())) .collect() } } impl<K, V, O: ErrorBarOrient<K, V>, DB: DrawingBackend> Drawable<DB> for ErrorBar<K, V, O> { fn draw<I: Iterator<Item = BackendCoord>>( &self, points: I, backend: &mut DB, _: (u32, u32), ) -> Result<(), DrawingErrorKind<DB::ErrorType>> { let points: Vec<_> = points.take(3).collect(); let (from, to) = O::ending_coord(points[0], self.width); backend.draw_line(from, to, &self.style)?; let (from, to) = O::ending_coord(points[2], self.width); backend.draw_line(from, to, &self.style)?; backend.draw_line(points[0], points[2], &self.style)?; backend.draw_circle(points[1], self.width / 2, &self.style, self.style.filled)?; Ok(()) } } #[cfg(test)] #[test] fn test_preserve_stroke_width() { let v = ErrorBar::new_vertical(100, 20, 50, 70, WHITE.filled().stroke_width(5), 3); let h = ErrorBar::new_horizontal(100, 20, 50, 70, WHITE.filled().stroke_width(5), 3); use crate::prelude::*; let da = crate::create_mocked_drawing_area(300, 300, |m| { m.check_draw_line(|_, w, _, _| { assert_eq!(w, 5); }); }); da.draw(&h).expect("Drawing Failure"); da.draw(&v).expect("Drawing Failure"); }