修改游戏底层矩阵相关

source/math/Interpolator.h

@@ -0,0 +1,153 @@
+// Copyright (c) 2016-2018 Ember - 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 <core/Function.h>
+#include <math/Vec2.hpp>
+#include <math/Rect.hpp>
+#include <math/Transform.hpp>
+
+namespace ember
+{
+    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 ember