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|
use super::*;
use crate::drawing::backend::DrawingBackend;
use std::borrow::Borrow;
use std::iter::{once, Once};
use std::marker::PhantomData;
use std::ops::Add;
/// An empty composable element, which is the start point of an ad-hoc composable element
pub struct EmptyElement<Coord, DB: DrawingBackend> {
coord: Coord,
phantom: PhantomData<DB>,
}
impl<Coord, DB: DrawingBackend> EmptyElement<Coord, DB> {
pub fn at(coord: Coord) -> Self {
Self {
coord,
phantom: PhantomData,
}
}
}
impl<Coord, Other, DB: DrawingBackend> Add<Other> for EmptyElement<Coord, DB>
where
Other: Drawable<DB>,
for<'a> &'a Other: PointCollection<'a, BackendCoord>,
{
type Output = BoxedElement<Coord, DB, Other>;
fn add(self, other: Other) -> Self::Output {
BoxedElement {
offset: self.coord,
inner: other,
phantom: PhantomData,
}
}
}
impl<'a, Coord, DB: DrawingBackend> PointCollection<'a, Coord> for &'a EmptyElement<Coord, DB> {
type Borrow = &'a Coord;
type IntoIter = Once<&'a Coord>;
fn point_iter(self) -> Self::IntoIter {
once(&self.coord)
}
}
impl<Coord, DB: DrawingBackend> Drawable<DB> for EmptyElement<Coord, DB> {
fn draw<I: Iterator<Item = BackendCoord>>(
&self,
_pos: I,
_backend: &mut DB,
_: (u32, u32),
) -> Result<(), DrawingErrorKind<DB::ErrorType>> {
Ok(())
}
}
/// An composed element has only one component
pub struct BoxedElement<Coord, DB: DrawingBackend, A: Drawable<DB>> {
inner: A,
offset: Coord,
phantom: PhantomData<DB>,
}
impl<'b, Coord, DB: DrawingBackend, A: Drawable<DB>> PointCollection<'b, Coord>
for &'b BoxedElement<Coord, DB, A>
{
type Borrow = &'b Coord;
type IntoIter = Once<&'b Coord>;
fn point_iter(self) -> Self::IntoIter {
once(&self.offset)
}
}
impl<Coord, DB: DrawingBackend, A> Drawable<DB> for BoxedElement<Coord, DB, A>
where
for<'a> &'a A: PointCollection<'a, BackendCoord>,
A: Drawable<DB>,
{
fn draw<I: Iterator<Item = BackendCoord>>(
&self,
mut pos: I,
backend: &mut DB,
ps: (u32, u32),
) -> Result<(), DrawingErrorKind<DB::ErrorType>> {
if let Some((x0, y0)) = pos.next() {
self.inner.draw(
self.inner.point_iter().into_iter().map(|p| {
let p = p.borrow();
(p.0 + x0, p.1 + y0)
}),
backend,
ps,
)?;
}
Ok(())
}
}
impl<Coord, DB: DrawingBackend, My, Yours> Add<Yours> for BoxedElement<Coord, DB, My>
where
My: Drawable<DB>,
for<'a> &'a My: PointCollection<'a, BackendCoord>,
Yours: Drawable<DB>,
for<'a> &'a Yours: PointCollection<'a, BackendCoord>,
{
type Output = ComposedElement<Coord, DB, My, Yours>;
fn add(self, yours: Yours) -> Self::Output {
ComposedElement {
offset: self.offset,
first: self.inner,
second: yours,
phantom: PhantomData,
}
}
}
/// The composed element which has at least two components
pub struct ComposedElement<Coord, DB: DrawingBackend, A, B>
where
A: Drawable<DB>,
B: Drawable<DB>,
{
first: A,
second: B,
offset: Coord,
phantom: PhantomData<DB>,
}
impl<'b, Coord, DB: DrawingBackend, A, B> PointCollection<'b, Coord>
for &'b ComposedElement<Coord, DB, A, B>
where
A: Drawable<DB>,
B: Drawable<DB>,
{
type Borrow = &'b Coord;
type IntoIter = Once<&'b Coord>;
fn point_iter(self) -> Self::IntoIter {
once(&self.offset)
}
}
impl<Coord, DB: DrawingBackend, A, B> Drawable<DB> for ComposedElement<Coord, DB, A, B>
where
for<'a> &'a A: PointCollection<'a, BackendCoord>,
for<'b> &'b B: PointCollection<'b, BackendCoord>,
A: Drawable<DB>,
B: Drawable<DB>,
{
fn draw<I: Iterator<Item = BackendCoord>>(
&self,
mut pos: I,
backend: &mut DB,
ps: (u32, u32),
) -> Result<(), DrawingErrorKind<DB::ErrorType>> {
if let Some((x0, y0)) = pos.next() {
self.first.draw(
self.first.point_iter().into_iter().map(|p| {
let p = p.borrow();
(p.0 + x0, p.1 + y0)
}),
backend,
ps,
)?;
self.second.draw(
self.second.point_iter().into_iter().map(|p| {
let p = p.borrow();
(p.0 + x0, p.1 + y0)
}),
backend,
ps,
)?;
}
Ok(())
}
}
impl<Coord, DB: DrawingBackend, A, B, C> Add<C> for ComposedElement<Coord, DB, A, B>
where
A: Drawable<DB>,
for<'a> &'a A: PointCollection<'a, BackendCoord>,
B: Drawable<DB>,
for<'a> &'a B: PointCollection<'a, BackendCoord>,
C: Drawable<DB>,
for<'a> &'a C: PointCollection<'a, BackendCoord>,
{
type Output = ComposedElement<Coord, DB, A, ComposedElement<BackendCoord, DB, B, C>>;
fn add(self, rhs: C) -> Self::Output {
ComposedElement {
offset: self.offset,
first: self.first,
second: ComposedElement {
offset: (0, 0),
first: self.second,
second: rhs,
phantom: PhantomData,
},
phantom: PhantomData,
}
}
}
|
