text: /******************************************************************************
   * Spine Runtimes License Agreement
   * Last updated May 1, 2019. Replaces all prior versions.
   *
   * Copyright (c) 2013-2019, Esoteric Software LLC
   *
   * Integration of the Spine Runtimes into software or otherwise creating
   * derivative works of the Spine Runtimes is permitted under the terms and
   * conditions of Section 2 of the Spine Editor License Agreement:
   * http://esotericsoftware.com/spine-editor-license
   *
   * Otherwise, it is permitted to integrate the Spine Runtimes into software
   * or otherwise create derivative works of the Spine Runtimes (collectively,
   * "Products"), provided that each user of the Products must obtain their own
   * Spine Editor license and redistribution of the Products in any form must
   * include this license and copyright notice.
   *
   * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY EXPRESS
   * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
   * NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, BUSINESS
   * INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
   * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *****************************************************************************/
  
  #ifdef SPINE_UE4
  #include "SpinePluginPrivatePCH.h"
  #endif
  
  #include "spine/TransformConstraintTimeline.h"
  
  #include "spine/Skeleton.h"
  #include "spine/Event.h"
  
  #include "spine/Animation.h"
  #include "spine/TimelineType.h"
  #include "spine/Slot.h"
  #include "spine/SlotData.h"
  #include "spine/TransformConstraint.h"
  #include "spine/TransformConstraintData.h"
  
  using namespace spine;
  
  RTTI_IMPL(TransformConstraintTimeline, CurveTimeline)
  
  const int TransformConstraintTimeline::ENTRIES = 5;
  const int TransformConstraintTimeline::PREV_TIME = -5;
  const int TransformConstraintTimeline::PREV_ROTATE = -4;
  const int TransformConstraintTimeline::PREV_TRANSLATE = -3;
  const int TransformConstraintTimeline::PREV_SCALE = -2;
  const int TransformConstraintTimeline::PREV_SHEAR = -1;
  const int TransformConstraintTimeline::ROTATE = 1;
  const int TransformConstraintTimeline::TRANSLATE = 2;
  const int TransformConstraintTimeline::SCALE = 3;
  const int TransformConstraintTimeline::SHEAR = 4;
  
  TransformConstraintTimeline::TransformConstraintTimeline(int frameCount) : CurveTimeline(frameCount),
  	_transformConstraintIndex(0)
  {
  	_frames.setSize(frameCount * ENTRIES, 0);
  }
  
  void TransformConstraintTimeline::apply(Skeleton &skeleton, float lastTime, float time, Vector<Event *> *pEvents,
  										float alpha, MixBlend blend, MixDirection direction) {
  	SP_UNUSED(lastTime);
  	SP_UNUSED(pEvents);
  	SP_UNUSED(direction);
  
  	TransformConstraint *constraintP = skeleton._transformConstraints[_transformConstraintIndex];
  	TransformConstraint &constraint = *constraintP;
  	if (!constraint.isActive()) return;
  
  	if (time < _frames[0]) {
  		switch (blend) {
  		case MixBlend_Setup:
  			constraint._rotateMix = constraint._data._rotateMix;
  			constraint._translateMix = constraint._data._translateMix;
  			constraint._scaleMix = constraint._data._scaleMix;
  			constraint._shearMix = constraint._data._shearMix;
  			return;
  		case MixBlend_First:
  			constraint._rotateMix += (constraint._data._rotateMix - constraint._rotateMix) * alpha;
  			constraint._translateMix += (constraint._data._translateMix - constraint._translateMix) * alpha;
  			constraint._scaleMix += (constraint._data._scaleMix - constraint._scaleMix) * alpha;
  			constraint._shearMix += (constraint._data._shearMix - constraint._shearMix) * alpha;
  			return;
  		default:
  			return;
  		}
  	}
  
  	float rotate, translate, scale, shear;
  	if (time >= _frames[_frames.size() - ENTRIES]) {
  		// Time is after last frame.
  		size_t i = _frames.size();
  		rotate = _frames[i + PREV_ROTATE];
  		translate = _frames[i + PREV_TRANSLATE];
  		scale = _frames[i + PREV_SCALE];
  		shear = _frames[i + PREV_SHEAR];
  	} else {
  		// Interpolate between the previous frame and the current frame.
  		int frame = Animation::binarySearch(_frames, time, ENTRIES);
  		rotate = _frames[frame + PREV_ROTATE];
  		translate = _frames[frame + PREV_TRANSLATE];
  		scale = _frames[frame + PREV_SCALE];
  		shear = _frames[frame + PREV_SHEAR];
  		float frameTime = _frames[frame];
  		float percent = getCurvePercent(frame / ENTRIES - 1,
  			1 - (time - frameTime) / (_frames[frame + PREV_TIME] - frameTime));
  
  		rotate += (_frames[frame + ROTATE] - rotate) * percent;
  		translate += (_frames[frame + TRANSLATE] - translate) * percent;
  		scale += (_frames[frame + SCALE] - scale) * percent;
  		shear += (_frames[frame + SHEAR] - shear) * percent;
  	}
  
  	if (blend == MixBlend_Setup) {
  		TransformConstraintData &data = constraint._data;
  		constraint._rotateMix = data._rotateMix + (rotate - data._rotateMix) * alpha;
  		constraint._translateMix = data._translateMix + (translate - data._translateMix) * alpha;
  		constraint._scaleMix = data._scaleMix + (scale - data._scaleMix) * alpha;
  		constraint._shearMix = data._shearMix + (shear - data._shearMix) * alpha;
  	} else {
  		constraint._rotateMix += (rotate - constraint._rotateMix) * alpha;
  		constraint._translateMix += (translate - constraint._translateMix) * alpha;
  		constraint._scaleMix += (scale - constraint._scaleMix) * alpha;
  		constraint._shearMix += (shear - constraint._shearMix) * alpha;
  	}
  }
  
  int TransformConstraintTimeline::getPropertyId() {
  	return ((int) TimelineType_TransformConstraint << 24) + _transformConstraintIndex;
  }
  
  void TransformConstraintTimeline::setFrame(size_t frameIndex, float time, float rotateMix, float translateMix, float scaleMix,
  	float shearMix
  ) {
  	frameIndex *= ENTRIES;
  	_frames[frameIndex] = time;
  	_frames[frameIndex + ROTATE] = rotateMix;
  	_frames[frameIndex + TRANSLATE] = translateMix;
  	_frames[frameIndex + SCALE] = scaleMix;
  	_frames[frameIndex + SHEAR] = shearMix;
  }
  