mirror of
https://github.com/EsotericSoftware/spine-runtimes.git
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131 lines
4.1 KiB
C++
131 lines
4.1 KiB
C++
/******************************************************************************
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* Spine Runtimes Software License v2.5
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*
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* Copyright (c) 2013-2016, Esoteric Software
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* All rights reserved.
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*
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* You are granted a perpetual, non-exclusive, non-sublicensable, and
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* non-transferable license to use, install, execute, and perform the Spine
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* Runtimes software and derivative works solely for personal or internal
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* use. Without the written permission of Esoteric Software (see Section 2 of
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* the Spine Software License Agreement), you may not (a) modify, translate,
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* adapt, or develop new applications using the Spine Runtimes or otherwise
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* create derivative works or improvements of the Spine Runtimes or (b) remove,
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* delete, alter, or obscure any trademarks or any copyright, trademark, patent,
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* or other intellectual property or proprietary rights notices on or in the
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* Software, including any copy thereof. Redistributions in binary or source
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* form must include this license and terms.
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*
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* THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL ESOTERIC SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, BUSINESS INTERRUPTION, OR LOSS OF
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* USE, DATA, OR PROFITS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*****************************************************************************/
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#ifndef Spine_MathUtil_h
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#define Spine_MathUtil_h
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#include <spine/SpineObject.h>
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#include <float.h>
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#include <string.h>
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namespace spine {
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static const float PI = 3.1415926535897932385f;
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static const float PI_2 = PI * 2;
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static const float DEG_RAD = (PI / 180.0f);
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static const float RAD_DEG = (180.0f / PI);
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class MathUtil : public SpineObject {
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private:
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MathUtil();
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public:
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template<typename T>
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static inline T min(T a, T b) { return a < b ? a : b; }
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template<typename T>
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static inline T max(T a, T b) { return a > b ? a : b; }
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static float sign(float val);
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static float clamp(float x, float lower, float upper);
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static float abs(float v);
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/// Returns the sine in radians from a lookup table.
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static float sin(float radians);
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/// Returns the cosine in radians from a lookup table.
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static float cos(float radians);
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/// Returns the sine in radians from a lookup table.
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static float sinDeg(float degrees);
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/// Returns the cosine in radians from a lookup table.
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static float cosDeg(float degrees);
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/// Returns atan2 in radians, faster but less accurate than Math.Atan2. Average error of 0.00231 radians (0.1323
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/// degrees), largest error of 0.00488 radians (0.2796 degrees).
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static float atan2(float y, float x);
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static float acos(float v);
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static float sqrt(float v);
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static float fmod(float a, float b);
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static bool isNan(float v);
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static float random();
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static float randomTriangular(float min, float max);
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static float randomTriangular(float min, float max, float mode);
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static float pow(float a, float b);
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};
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struct Interpolation {
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virtual float apply(float a) = 0;
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virtual float interpolate(float start, float end, float a) {
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return start + (end - start) * apply(a);
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}
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virtual ~Interpolation() {};
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};
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struct PowInterpolation: public Interpolation {
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PowInterpolation(int power): power(power) {
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}
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float apply(float a) {
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if (a <= 0.5f) return MathUtil::pow(a * 2.0f, (float)power) / 2.0f;
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return MathUtil::pow((a - 1.0f) * 2.0f, (float)power) / (power % 2 == 0 ? -2.0f : 2.0f) + 1.0f;
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}
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int power;
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};
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struct PowOutInterpolation: public Interpolation {
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PowOutInterpolation(int power): power(power) {
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}
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float apply(float a) {
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return MathUtil::pow(a - 1, (float)power) * (power % 2 == 0 ? -1.0f : 1.0f) + 1.0f;
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}
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int power;
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};
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}
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#endif /* Spine_MathUtil_h */
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