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use plotters_backend::BackendCoord;
use std::ops::Deref;
/// The trait that translates some customized object to the backend coordinate
pub trait CoordTranslate {
/// Specifies the object to be translated from
type From;
/// Translate the guest coordinate to the guest coordinate
fn translate(&self, from: &Self::From) -> BackendCoord;
/// Get the Z-value of current coordinate
fn depth(&self, _from: &Self::From) -> i32 {
0
}
}
impl<C, T> CoordTranslate for T
where
C: CoordTranslate,
T: Deref<Target = C>,
{
type From = C::From;
fn translate(&self, from: &Self::From) -> BackendCoord {
self.deref().translate(from)
}
}
/// The trait indicates that the coordinate system supports reverse transform
/// This is useful when we need an interactive plot, thus we need to map the event
/// from the backend coordinate to the logical coordinate
pub trait ReverseCoordTranslate: CoordTranslate {
/// Reverse translate the coordinate from the drawing coordinate to the
/// logic coordinate.
/// Note: the return value is an option, because it's possible that the drawing
/// coordinate isn't able to be represented in te guest coordinate system
fn reverse_translate(&self, input: BackendCoord) -> Option<Self::From>;
}
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