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use super::convert::*; use super::Scale; use std::cmp::Ordering; use std::ops::*; pub trait Converter<E, I> where E: Sub<Output = E> + Add<Output = E> + PartialOrd + FromFloat<f64> + ToFloat<f64> + Clone, I: Sub<Output = I> + Add<Output = I> + PartialOrd + FromFloat<f64> + ToFloat<f64> + Clone, { fn convert(&self, external_value: E) -> I; fn convert_back(&self, internal_value: I) -> E; fn add_external(&self, external_delta: E, internal_value: I) -> I { let external_value = self.convert_back(internal_value); let new_internal_value = self.convert(external_value + external_delta); new_internal_value } fn add_internal(&self, internal_delta: I, external_value: E) -> E { let internal_value = self.convert(external_value); let new_external_value = self.convert_back(internal_value + internal_delta); new_external_value } } pub trait ClampingConverter<E, I>: Converter<E, I> where E: Sub<Output = E> + Add<Output = E> + PartialOrd + FromFloat<f64> + ToFloat<f64> + Clone, I: Sub<Output = I> + Add<Output = I> + PartialOrd + FromFloat<f64> + ToFloat<f64> + Clone, { fn external_max(&self) -> E; fn external_min(&self) -> E; fn internal_max(&self) -> I; fn internal_min(&self) -> I; fn add_external_clamped(&self, external_delta: E, internal_value: I) -> I { let min = self.internal_min(); let max = self.internal_max(); let val = self.add_external(external_delta, internal_value); match min.partial_cmp(&val) { Some(Ordering::Greater) => min, _ => match max.partial_cmp(&val) { Some(Ordering::Less) => max, _ => val, }, } } fn add_internal_clamped(&self, internal_delta: I, external_value: E) -> E { let min = self.external_min(); let max = self.external_max(); let val = self.add_internal(internal_delta, external_value); match min.partial_cmp(&val) { Some(Ordering::Greater) => min, _ => match max.partial_cmp(&val) { Some(Ordering::Less) => max, _ => val, }, } } } impl<E, I, SE, SI> Converter<E, I> for (SE, SI) where E: Sub<Output = E> + Add<Output = E> + PartialOrd + FromFloat<f64> + ToFloat<f64> + Clone, I: Sub<Output = I> + Add<Output = I> + PartialOrd + FromFloat<f64> + ToFloat<f64> + Clone, SE: Scale<E>, SI: Scale<I>, { fn convert(&self, external_value: E) -> I { let external = &self.0; let internal = &self.1; let rel = external.to_relative(external_value); internal.to_absolute(rel) } fn convert_back(&self, internal_value: I) -> E { let external = &self.0; let internal = &self.1; let rel = internal.to_relative(internal_value); external.to_absolute(rel) } } impl<E, I, SE, SI> ClampingConverter<E, I> for (SE, SI) where E: Sub<Output = E> + Add<Output = E> + PartialOrd + FromFloat<f64> + ToFloat<f64> + Clone, I: Sub<Output = I> + Add<Output = I> + PartialOrd + FromFloat<f64> + ToFloat<f64> + Clone, SE: Scale<E>, SI: Scale<I>, { fn external_max(&self) -> E { self.0.max() } fn external_min(&self) -> E { self.0.min() } fn internal_max(&self) -> I { self.1.max() } fn internal_min(&self) -> I { self.1.min() } } #[cfg(test)] mod test { use crate::prelude::*; use assert_approx_eq::*; #[test] fn test_converter() { let lin = LinearScale::new(0.0, 100.0); let log = LogarithmicScale::new(20.0, 24_000.0); assert_approx_eq!((&lin, &log).convert(0.0), 20f64); assert_approx_eq!((lin, log).convert(100.0), 24_000f64); } #[test] fn example_from_readme() { let slider = Slider; let parameter = Parameter; let relative = (slider.value() - slider.min()) / (slider.max() - slider.min()); let log_range = parameter.max().log10() - parameter.min().log10(); let exp = parameter.min().log10() + relative * log_range; let new_value = 10f64.powf(exp); parameter.set(new_value); let slider_scale = LinearScale::new(slider.min(), slider.max()); let parameter_scale = LogarithmicScale::new(parameter.min(), parameter.max()); let new_value = (&slider_scale, ¶meter_scale).convert(slider.value()); parameter.set(new_value); } struct Slider; impl Slider { fn value(&self) -> f64 { 21.0 } fn min(&self) -> f64 { 0.0 } fn max(&self) -> f64 { 100.0 } } struct Parameter; impl Parameter { fn set(&self, _: f64) {} fn min(&self) -> f64 { 10.0 } fn max(&self) -> f64 { 500.0 } } }