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AreaUtils: Migrated package to
com.jme3.util (#1826)
* AreaUtils: Migrated package to `com.jme3.util` * com.jme3.uitl.AreaUtils: removed code duplicates - added `final` class specifier * com.jme3.util.AreaUtils: fixed duplication build error * utils/AreaUtils.java: full migration to the utility package * scene/control/AreaUtils.java: removed utility methods - delegated functionality to `jme3.utils.AreaUtils` * scene/AreaUtils: fixed `jme3.util` package linking typo
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| /* | ||
| * Copyright (c) 2009-2022 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.util; | ||
|
|
||
| import com.jme3.bounding.BoundingBox; | ||
| import com.jme3.bounding.BoundingSphere; | ||
| import com.jme3.bounding.BoundingVolume; | ||
| import com.jme3.math.FastMath; | ||
|
|
||
| /** | ||
| * <code>AreaUtils</code> is used to calculate the area of various objects, such as bounding volumes. These | ||
| * functions are very loose approximations. | ||
| * | ||
| * @author Joshua Slack | ||
| * @version $Id: AreaUtils.java 4131 2009-03-19 20:15:28Z blaine.dev $ | ||
| */ | ||
| public final class AreaUtils { | ||
| /** | ||
| * A private constructor to inhibit instantiation of this class. | ||
| */ | ||
| private AreaUtils() { | ||
| } | ||
|
|
||
| /** | ||
| * Estimate the screen area of a bounding volume. If the volume isn't a | ||
| * BoundingSphere, BoundingBox, or OrientedBoundingBox, 0 is returned. | ||
| * | ||
| * @param bound The bounds to calculate the volume from. | ||
| * @param distance The distance from camera to object. | ||
| * @param screenWidth The width of the screen. | ||
| * @return The area in pixels on the screen of the bounding volume. | ||
| */ | ||
| public static float calcScreenArea(BoundingVolume bound, float distance, float screenWidth) { | ||
| if (bound.getType() == BoundingVolume.Type.Sphere) { | ||
| return calcScreenArea((BoundingSphere) bound, distance, screenWidth); | ||
| } else if (bound.getType() == BoundingVolume.Type.AABB) { | ||
| return calcScreenArea((BoundingBox) bound, distance, screenWidth); | ||
| } | ||
| return 0.0f; | ||
| } | ||
|
|
||
| private static float calcScreenArea(BoundingSphere bound, float distance, float screenWidth) { | ||
| // Where is the center point and a radius point that lies in a plan parallel to the view plane? | ||
| // // Calc radius based on these two points and plug into circle area formula. | ||
| // Vector2f centerSP = null; | ||
| // Vector2f outerSP = null; | ||
| // float radiusSq = centerSP.subtract(outerSP).lengthSquared(); | ||
| float radius = (bound.getRadius() * screenWidth) / (distance * 2); | ||
| return radius * radius * FastMath.PI; | ||
| } | ||
|
|
||
| private static float calcScreenArea(BoundingBox bound, float distance, float screenWidth) { | ||
| // Calc as if we are a BoundingSphere for now... | ||
| float radiusSquare = bound.getXExtent() * bound.getXExtent() | ||
| + bound.getYExtent() * bound.getYExtent() | ||
| + bound.getZExtent() * bound.getZExtent(); | ||
| return ((radiusSquare * screenWidth * screenWidth) / (distance * distance * 4)) * FastMath.PI; | ||
| } | ||
| } |