text: /******************************************************************************
   * Spine Runtimes License Agreement
   * Last updated January 1, 2020. Replaces all prior versions.
   *
   * Copyright (c) 2013-2020, 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.
   *
   * THE SPINE RUNTIMES ARE 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
   * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *****************************************************************************/
  
  #ifdef SPINE_UE4
  #include "SpinePluginPrivatePCH.h"
  #endif
  
  #include <spine/PathConstraintSpacingTimeline.h>
  
  #include <spine/Event.h>
  #include <spine/Skeleton.h>
  
  #include <spine/Animation.h>
  #include <spine/PathConstraint.h>
  #include <spine/PathConstraintData.h>
  #include <spine/Property.h>
  #include <spine/Slot.h>
  #include <spine/SlotData.h>
  
  using namespace spine;
  
  RTTI_IMPL(PathConstraintSpacingTimeline, PathConstraintPositionTimeline)
  
  PathConstraintSpacingTimeline::PathConstraintSpacingTimeline(size_t frameCount, size_t bezierCount,
  															 int pathConstraintIndex) : CurveTimeline1(frameCount,
  																									   bezierCount),
  																						_pathConstraintIndex(
  																								pathConstraintIndex) {
  	PropertyId ids[] = {((PropertyId) Property_PathConstraintSpacing << 32) | pathConstraintIndex};
  	setPropertyIds(ids, 1);
  }
  
  void PathConstraintSpacingTimeline::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);
  
  	PathConstraint *constraintP = skeleton._pathConstraints[_pathConstraintIndex];
  	PathConstraint &constraint = *constraintP;
  	if (!constraint.isActive()) return;
  
  	if (time < _frames[0]) {
  		switch (blend) {
  			case MixBlend_Setup:
  				constraint._spacing = constraint._data._spacing;
  				return;
  			case MixBlend_First:
  				constraint._spacing += (constraint._data._spacing - constraint._spacing) * alpha;
  				return;
  			default:
  				return;
  		}
  	}
  
  	float spacing = getCurveValue(time);
  
  	if (blend == MixBlend_Setup)
  		constraint._spacing = constraint._data._spacing + (spacing - constraint._data._spacing) * alpha;
  	else
  		constraint._spacing += (spacing - constraint._spacing) * alpha;
  }
  