160 lines
4.5 KiB
C++
160 lines
4.5 KiB
C++
// Copyright (c) 2016-2018 Kiwano - Nomango
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
// THE SOFTWARE.
|
|
|
|
#pragma once
|
|
#include <kiwano/core/Function.h>
|
|
#include <kiwano/math/Vec2.hpp>
|
|
#include <kiwano/math/Rect.hpp>
|
|
#include <kiwano/math/Transform.hpp>
|
|
|
|
namespace kiwano
|
|
{
|
|
namespace math
|
|
{
|
|
|
|
|
|
template <typename _Method = void>
|
|
struct InterpolateMethod;
|
|
|
|
template <>
|
|
struct InterpolateMethod<void>
|
|
{
|
|
inline float operator()(float frac) const noexcept
|
|
{
|
|
return frac;
|
|
}
|
|
};
|
|
|
|
template <>
|
|
struct InterpolateMethod<float (*)(float)>
|
|
{
|
|
float (*method)(float);
|
|
|
|
InterpolateMethod(float (*method)(float)) noexcept
|
|
: method(method)
|
|
{
|
|
}
|
|
|
|
inline float operator()(float frac) const noexcept
|
|
{
|
|
if (method)
|
|
return method(frac);
|
|
return frac;
|
|
}
|
|
};
|
|
|
|
template <>
|
|
struct InterpolateMethod<Function<float(float)>>
|
|
{
|
|
Function<float(float)> method;
|
|
|
|
InterpolateMethod(const Function<float(float)>& method) noexcept
|
|
: method(method)
|
|
{
|
|
}
|
|
|
|
inline float operator()(float frac) const noexcept
|
|
{
|
|
if (method)
|
|
return method(frac);
|
|
return frac;
|
|
}
|
|
};
|
|
|
|
template <typename _Ty>
|
|
class Interpolator;
|
|
|
|
template <typename _Ty>
|
|
class Interpolator
|
|
{
|
|
public:
|
|
template <typename _Method = void>
|
|
inline _Ty Interpolate(_Ty start, _Ty end, float frac, const InterpolateMethod<_Method>& method = {})
|
|
{
|
|
if (frac >= 1)
|
|
return end;
|
|
return start + static_cast<_Ty>(static_cast<float>(end - start) * method(frac));
|
|
}
|
|
};
|
|
|
|
template <typename _Ty>
|
|
class Interpolator<Vec2T<_Ty>>
|
|
{
|
|
public:
|
|
template <typename _Method = void>
|
|
inline Vec2T<_Ty> Interpolate(const Vec2T<_Ty>& start, const Vec2T<_Ty>& end, float frac,
|
|
const InterpolateMethod<_Method>& method = {})
|
|
{
|
|
if (frac >= 1)
|
|
return end;
|
|
|
|
Interpolator<_Ty> fi;
|
|
return Vec2T<_Ty>{
|
|
fi.Interpolate(start.x, end.x, frac, method),
|
|
fi.Interpolate(start.y, end.y, frac, method)
|
|
};
|
|
}
|
|
};
|
|
|
|
template <typename _Ty>
|
|
class Interpolator<RectT<_Ty>>
|
|
{
|
|
public:
|
|
template <typename _Method = void>
|
|
inline RectT<_Ty> Interpolate(const RectT<_Ty>& start, const RectT<_Ty>& end, float frac,
|
|
const InterpolateMethod<_Method>& method = {})
|
|
{
|
|
if (frac >= 1)
|
|
return end;
|
|
|
|
Interpolator<Vec2T<_Ty>> vi;
|
|
return RectT<_Ty>{
|
|
vi.Interpolate(start.left_top, end.left_top, frac, method),
|
|
vi.Interpolate(start.right_bottom, end.right_bottom, frac, method)
|
|
};
|
|
}
|
|
};
|
|
|
|
template <typename _Ty>
|
|
class Interpolator<TransformT<_Ty>>
|
|
{
|
|
public:
|
|
template <typename _Method = void>
|
|
inline TransformT<_Ty> Interpolate(const TransformT<_Ty>& start, const TransformT<_Ty>& end, float frac,
|
|
const InterpolateMethod<_Method>& method = {})
|
|
{
|
|
if (frac >= 1)
|
|
return end;
|
|
|
|
Interpolator<_Ty> fi;
|
|
Interpolator<Vec2T<_Ty>> vi;
|
|
|
|
TransformT<_Ty> transform;
|
|
transform.rotation = fi.Interpolate(start.rotation, end.rotation, frac, method);
|
|
transform.position = vi.Interpolate(start.position, end.position, frac, method);
|
|
transform.scale = vi.Interpolate(start.scale, end.scale, frac, method);
|
|
transform.skew = vi.Interpolate(start.skew, end.skew, frac, method);
|
|
return transform;
|
|
}
|
|
};
|
|
|
|
} // namespace math
|
|
} // namespace kiwano
|