com.jme3.anim.tween.action.BlendSpace: basic javadoc

jme3-core/src/main/java/com/jme3/anim/tween/action/BlendSpace.java

@@ -1,10 +1,84 @@
+/*
+ * Copyright (c) 2009-2023 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) 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.
+ */
 package com.jme3.anim.tween.action;
 
+/**
+ * Controls the blending between 2 successive actions in a {@link BlendAction} by adjusting blending weight value
+ * {@link BlendSpace#getWeight()} during application runtime based on an arbitrary value {@link BlendSpace#setValue(float)}.
+ * 
+ * <p>
+ * Notes:
+ * <li> Blending is the action of mixing between 2 successive animation {@link BlendableAction}s by interpolating their transforms and 
+ * then applying them on a {@link HasLocalTransform} object, the {@link BlendSpace} provides this blending action with a blend weight value. </li>
+ * <li> The blend weight is the value for the interpolation for the target transforms. </li>
+ * <li> The blend weight value should lie in this interval [0, 1]. </li>
+ * </p>
+ * 
+ * <p>
+ * Different blending weight case scenarios managed by {@link BlendAction} internally:
+ * <li> In case of (0 < Blending weight < 1), the blending is executed each update among 2 actions, the first action will use 
+ * a blend value of 1 and the second action will use the blend space weight as a value for the interpolation. </li>
+ * <li> In case of (Blending weight <= 0), the blending hasn't started yet, only the first action will be interpolated at (weight = 1). </li>
+ * <li> In case of (Blending weight = 1), the blending is finished and only the second action will continue to run. </li>
+ * <li> In case of (Blending weight > 1), the blending is finished and only the second action will continue to run, but with extrapolation. </li>
+ * <li> Find more at {@link BlendAction#doInterpolate(double)} and {@link BlendAction#collectTransform(HasLocalTransform, Transform, float, BlendableAction)}. </li>
+ * </p>
+ * 
+ * Created by Nehon.
+ * @see LinearBlendSpace an example of blendspace implementation
+ */
 public interface BlendSpace {
 
+    /**
+     * Adjusts the target blend-action instance that utilize the blend-weight value provided by this blend-space implementation.
+     * 
+     * @param action the blend-action instance that will utilize this blend-space.
+     */
     public void setBlendAction(BlendAction action);
 
+    /**
+     * Used for passing the desired weight to the selected {@link BlendAction} instance,
+     * this value will be used for interpolating a collection of actions' transformations (keyframes).
+     * 
+     * @return the blending weight value.
+     * @see LinearBlendSpace#getWeight()
+     */
     public float getWeight();
 
+    /**
+     * An arbitrary value used for adjusting the blending weight value.
+     * 
+     * @param value the value in floats.
+     * @see LinearBlendSpace#setValue(float)
+     */
     public void setValue(float value);
 }