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|
use super::*;
use super::{Drawable, PointCollection};
use crate::style::{Color, ShapeStyle, SizeDesc};
use plotters_backend::{BackendCoord, DrawingBackend, DrawingErrorKind};
/**
A common trait for elements that can be interpreted as points: A cross, a circle, a triangle marker...
This is used internally by Plotters and should probably not be included in user code.
See [`EmptyElement`] for more information and examples.
*/
pub trait PointElement<Coord, Size: SizeDesc> {
/**
Point creator.
This is used internally by Plotters and should probably not be included in user code.
See [`EmptyElement`] for more information and examples.
*/
fn make_point(pos: Coord, size: Size, style: ShapeStyle) -> Self;
}
/**
A cross marker for visualizing data series.
See [`EmptyElement`] for more information and examples.
*/
pub struct Cross<Coord, Size: SizeDesc> {
center: Coord,
size: Size,
style: ShapeStyle,
}
impl<Coord, Size: SizeDesc> Cross<Coord, Size> {
/**
Creates a cross marker.
See [`EmptyElement`] for more information and examples.
*/
pub fn new<T: Into<ShapeStyle>>(coord: Coord, size: Size, style: T) -> Self {
Self {
center: coord,
size,
style: style.into(),
}
}
}
impl<'a, Coord: 'a, Size: SizeDesc> PointCollection<'a, Coord> for &'a Cross<Coord, Size> {
type Point = &'a Coord;
type IntoIter = std::iter::Once<&'a Coord>;
fn point_iter(self) -> std::iter::Once<&'a Coord> {
std::iter::once(&self.center)
}
}
impl<Coord, DB: DrawingBackend, Size: SizeDesc> Drawable<DB> for Cross<Coord, Size> {
fn draw<I: Iterator<Item = BackendCoord>>(
&self,
mut points: I,
backend: &mut DB,
ps: (u32, u32),
) -> Result<(), DrawingErrorKind<DB::ErrorType>> {
if let Some((x, y)) = points.next() {
let size = self.size.in_pixels(&ps);
let (x0, y0) = (x - size, y - size);
let (x1, y1) = (x + size, y + size);
backend.draw_line((x0, y0), (x1, y1), &self.style)?;
backend.draw_line((x0, y1), (x1, y0), &self.style)?;
}
Ok(())
}
}
/**
A triangle marker for visualizing data series.
See [`EmptyElement`] for more information and examples.
*/
pub struct TriangleMarker<Coord, Size: SizeDesc> {
center: Coord,
size: Size,
style: ShapeStyle,
}
impl<Coord, Size: SizeDesc> TriangleMarker<Coord, Size> {
/**
Creates a triangle marker.
See [`EmptyElement`] for more information and examples.
*/
pub fn new<T: Into<ShapeStyle>>(coord: Coord, size: Size, style: T) -> Self {
Self {
center: coord,
size,
style: style.into(),
}
}
}
impl<'a, Coord: 'a, Size: SizeDesc> PointCollection<'a, Coord> for &'a TriangleMarker<Coord, Size> {
type Point = &'a Coord;
type IntoIter = std::iter::Once<&'a Coord>;
fn point_iter(self) -> std::iter::Once<&'a Coord> {
std::iter::once(&self.center)
}
}
impl<Coord, DB: DrawingBackend, Size: SizeDesc> Drawable<DB> for TriangleMarker<Coord, Size> {
fn draw<I: Iterator<Item = BackendCoord>>(
&self,
mut points: I,
backend: &mut DB,
ps: (u32, u32),
) -> Result<(), DrawingErrorKind<DB::ErrorType>> {
if let Some((x, y)) = points.next() {
let size = self.size.in_pixels(&ps);
let points = [-90, -210, -330]
.iter()
.map(|deg| f64::from(*deg) * std::f64::consts::PI / 180.0)
.map(|rad| {
(
(rad.cos() * f64::from(size) + f64::from(x)).ceil() as i32,
(rad.sin() * f64::from(size) + f64::from(y)).ceil() as i32,
)
});
backend.fill_polygon(points, &self.style.color.to_backend_color())?;
}
Ok(())
}
}
impl<Coord, Size: SizeDesc> PointElement<Coord, Size> for Cross<Coord, Size> {
fn make_point(pos: Coord, size: Size, style: ShapeStyle) -> Self {
Self::new(pos, size, style)
}
}
impl<Coord, Size: SizeDesc> PointElement<Coord, Size> for TriangleMarker<Coord, Size> {
fn make_point(pos: Coord, size: Size, style: ShapeStyle) -> Self {
Self::new(pos, size, style)
}
}
impl<Coord, Size: SizeDesc> PointElement<Coord, Size> for Circle<Coord, Size> {
fn make_point(pos: Coord, size: Size, style: ShapeStyle) -> Self {
Self::new(pos, size, style)
}
}
impl<Coord, Size: SizeDesc> PointElement<Coord, Size> for Pixel<Coord> {
fn make_point(pos: Coord, _: Size, style: ShapeStyle) -> Self {
Self::new(pos, style)
}
}
|
