113 lines
3.3 KiB
C++
113 lines
3.3 KiB
C++
/******************************************************************************
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* Spine Runtimes License Agreement
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* Last updated April 5, 2025. Replaces all prior versions.
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*
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* Copyright (c) 2013-2025, Esoteric Software LLC
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*
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* Integration of the Spine Runtimes into software or otherwise creating
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* derivative works of the Spine Runtimes is permitted under the terms and
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* conditions of Section 2 of the Spine Editor License Agreement:
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* http://esotericsoftware.com/spine-editor-license
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*
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* Otherwise, it is permitted to integrate the Spine Runtimes into software
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* or otherwise create derivative works of the Spine Runtimes (collectively,
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* "Products"), provided that each user of the Products must obtain their own
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* Spine Editor license and redistribution of the Products in any form must
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* include this license and copyright notice.
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*
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* THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
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* BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*****************************************************************************/
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#include <spine/Interpolation.h>
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#include <spine/MathUtil.h>
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using namespace spine;
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namespace {
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class LinearInterpolation : public Interpolation {
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public:
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float apply(float a) override {
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return a;
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}
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};
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class SmoothInterpolation : public Interpolation {
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public:
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float apply(float a) override {
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return a * a * (3 - 2 * a);
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}
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};
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class SlowFastInterpolation : public Interpolation {
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public:
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float apply(float a) override {
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return a * a;
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}
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};
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class FastSlowInterpolation : public Interpolation {
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public:
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float apply(float a) override {
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return (a - 1) * (a - 1) * -1 + 1;
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}
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};
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class CircleInterpolation : public Interpolation {
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public:
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float apply(float a) override {
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if (a <= 0.5f) {
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a *= 2;
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return (1 - MathUtil::sqrt(1 - a * a)) / 2;
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}
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a--;
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a *= 2;
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return (MathUtil::sqrt(1 - a * a) + 1) / 2;
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}
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};
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}
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Interpolation::~Interpolation() {
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}
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float Interpolation::apply(float a) {
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return a;
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}
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float Interpolation::apply(float start, float end, float a) {
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return start + (end - start) * apply(a);
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}
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Interpolation &Interpolation::linear() {
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static LinearInterpolation interpolation;
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return interpolation;
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}
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Interpolation &Interpolation::smooth() {
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static SmoothInterpolation interpolation;
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return interpolation;
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}
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Interpolation &Interpolation::slowFast() {
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static SlowFastInterpolation interpolation;
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return interpolation;
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}
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Interpolation &Interpolation::fastSlow() {
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static FastSlowInterpolation interpolation;
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return interpolation;
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}
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Interpolation &Interpolation::circle() {
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static CircleInterpolation interpolation;
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return interpolation;
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}
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