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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 { 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>; }