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92 lines
2.5 KiB
92 lines
2.5 KiB
#pragma once
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#include <utility>
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#include <tuple>
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#include <common.h>
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namespace util{
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enum class bound
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{
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Inclusive,
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Exclusive,
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};
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template<typename T> struct range;
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using bounds = range<bound>;
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constexpr static inline const bounds default_bounds();
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template<typename T>
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struct range final
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{
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using type = T;
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//constexpr inline range(T start, T end) : start(start), end(end){}
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constexpr inline range(T&& start, T&& end) : start(std::move(start)), end(std::move(end)){}
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constexpr inline range(const T& start, const T& end) : start(start), end(end){}
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constexpr inline range(range<T>&& move) : start(std::move(move.start)), end(std::move(move.end)) {}
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constexpr inline range(const range<T>& copy) : start(copy.start), end(copy.end){}
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constexpr inline ~range() {}
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constexpr inline auto length() const { return end-start; }
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constexpr inline auto length(const T& from) const { return from - start; }
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constexpr inline bool negative() const { return length() < 0; }
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constexpr inline range<T>& normalise() {
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if(negative()) std::swap(start, end);
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return *this;
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}
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template<usize I>
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requires (I < 2)
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constexpr inline T& get() { return I ? end : start; }
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template<usize I>
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requires (I < 2)
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constexpr inline const T& get() const { return I ? end : start; }
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template<bounds Bounds = default_bounds()>
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constexpr inline bool contains(const T& value) const
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{
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return (Bounds.get<0>() == bound::Exclusive
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? value > start
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: value >= start) &&
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(Bounds.get<1>() == bound::Exclusive
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? value < end
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: value <= end);
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}
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template<bounds Bounds = default_bounds()>
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constexpr inline void clamp(T& value) const
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{
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if constexpr(Bounds.get<0>() == bound::Exclusive) {
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if (value <= start) value = start + 1;
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} else if (value < start) value = start;
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if constexpr(Bounds.get<1>() == bound::Exclusive) {
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if (value >= end) value = end - 1;
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} else if (value > end) value = end;
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}
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// Scale the `value` from this range to another one (of a compatable type).
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template<bounds Bounds = default_bounds()>
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constexpr inline auto scale(const range<auto>& to, T value)
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{
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clamp<Bounds>(value);
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const auto diff = length(value);
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const f64 fract = f64(diff) / f64(length());
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const auto diff2 = decltype(to)::type(fract * f64(to.length()));
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return to.start + diff2;
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}
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template<bounds Bounds>
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constexpr inline auto scale(const range<T>& to, T value);
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T start, end;
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};
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constexpr static inline const bounds default_bounds() { return { bound::Inclusive, bound::Exclusive }; }
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}
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