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jMonkeyEngine is a 3-D game engine for adventurous Java developers
/*
* Copyright (c) 2009-2020 jMonkeyEngine
* All rights reserved.
*
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* 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
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* 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.terrain.heightmap;
import java.util.logging.Logger;
/**
* Generates a new height map based on
* two provided height maps. These maps can either be added together
* or subtracted from each other. Each heightmap has a weight to
* determine how much one will affect the other. By default, it is set to
* 0.5, 0.5, meaning the two heightmaps have equal weight. This
* value can be adjusted at will, as long as the two factors sum to 1.
*
* @author Mark Powell
* @version $Id$
*/
public class CombinerHeightMap extends AbstractHeightMap {
private static final Logger logger = Logger.getLogger(CombinerHeightMap.class.getName());
/**
* Constant mode to denote adding the two heightmaps.
*/
public static final int ADDITION = 0;
/**
* Constant mode to denote subtracting the two heightmaps.
*/
public static final int SUBTRACTION = 1;
//the two maps.
private AbstractHeightMap map1;
private AbstractHeightMap map2;
//the two factors
private float factor1 = 0.5f;
private float factor2 = 0.5f;
//the combine mode.
private int mode;
/**
* Constructor combines two given heightmaps by the specified mode.
* The heightmaps will be evenly distributed. The heightmaps
* must be of the same size.
*
* @param map1 the first heightmap to combine.
* @param map2 the second heightmap to combine.
* @param mode denotes whether to add or subtract the heightmaps, may
* be either ADDITION or SUBTRACTION.
* @throws Exception if either map is null, their size
* do not match or the mode is invalid.
*/
public CombinerHeightMap(
AbstractHeightMap map1,
AbstractHeightMap map2,
int mode) throws Exception {
//insure all parameters are valid.
if (null == map1 || null == map2) {
throw new Exception("Height map may not be null");
}
if (map1.getSize() != map2.getSize()) {
throw new Exception("The two maps must be of the same size");
}
if ((factor1 + factor2) != 1.0f) {
throw new Exception("factor1 and factor2 must add to 1.0");
}
this.size = map1.getSize();
this.map1 = map1;
this.map2 = map2;
setMode(mode);
load();
}
/**
* Constructor combines two given heightmaps by the specified mode.
* The heightmaps will be distributed based on the given factors.
* For example, if factor1 is 0.6 and factor2 is 0.4, then 60% of
* map1 will be used with 40% of map2. The two factors must add up
* to 1.0. The heightmaps must also be of the same size.
*
* @param map1 the first heightmap to combine.
* @param factor1 the factor for map1.
* @param map2 the second heightmap to combine.
* @param factor2 the factor for map2.
* @param mode denotes whether to add or subtract the heightmaps, may
* be either ADDITION or SUBTRACTION.
* @throws Exception if either map is null, their size
* do not match, the mode is invalid, or the factors do not add
* to 1.0.
*/
public CombinerHeightMap(
AbstractHeightMap map1,
float factor1,
AbstractHeightMap map2,
float factor2,
int mode) throws Exception {
//insure all parameters are valid.
if (null == map1 || null == map2) {
throw new Exception("Height map may not be null");
}
if (map1.getSize() != map2.getSize()) {
throw new Exception("The two maps must be of the same size");
}
if ((factor1 + factor2) != 1.0f) {
throw new Exception("factor1 and factor2 must add to 1.0");
}
setMode(mode);
this.size = map1.getSize();
this.map1 = map1;
this.map2 = map2;
this.factor1 = factor1;
this.factor2 = factor2;
this.mode = mode;
load();
}
/**
* setFactors sets the distribution of heightmaps.
* For example, if factor1 is 0.6 and factor2 is 0.4, then 60% of
* map1 will be used with 40% of map2. The two factors must add up
* to 1.0.
* @param factor1 the factor for map1.
* @param factor2 the factor for map2.
* @throws Exception if the factors do not add to 1.0.
*/
public void setFactors(float factor1, float factor2) throws Exception {
if ((factor1 + factor2) != 1.0f) {
throw new Exception("factor1 and factor2 must add to 1.0");
}
this.factor1 = factor1;
this.factor2 = factor2;
}
/**
* setHeightMaps sets the height maps to combine.
* The size of the height maps must be the same.
* @param map1 the first height map.
* @param map2 the second height map.
* @throws Exception if either height map is null, or their
* sizes do not match.
*/
public void setHeightMaps(AbstractHeightMap map1, AbstractHeightMap map2) throws Exception {
if (null == map1 || null == map2) {
throw new Exception("Height map may not be null");
}
if (map1.getSize() != map2.getSize()) {
throw new Exception("The two maps must be of the same size");
}
this.size = map1.getSize();
this.map1 = map1;
this.map2 = map2;
}
/**
* setMode sets the mode of the combiner. This may either
* be ADDITION or SUBTRACTION.
* @param mode the mode of the combiner.
* @throws Exception if mode is not ADDITION or SUBTRACTION.
*/
public void setMode(int mode) throws Exception {
if (mode != ADDITION && mode != SUBTRACTION) {
throw new Exception("Invalid mode");
}
this.mode = mode;
}
/**
* load builds a new heightmap based on the combination of
* two other heightmaps. The conditions of the combiner determine the
* final outcome of the heightmap.
*
* @return boolean if the heightmap was successfully created.
*/
@Override
public boolean load() {
if (null != heightData) {
unloadHeightMap();
}
heightData = new float[size * size];
float[] temp1 = map1.getHeightMap();
float[] temp2 = map2.getHeightMap();
if (mode == ADDITION) {
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
heightData[i + (j * size)] =
(int) (temp1[i + (j * size)] * factor1
+ temp2[i + (j * size)] * factor2);
}
}
} else if (mode == SUBTRACTION) {
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
heightData[i + (j * size)] =
(int) (temp1[i + (j * size)] * factor1
- temp2[i + (j * size)] * factor2);
}
}
}
logger.fine("Created heightmap using Combiner");
return true;
}
}
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