Plex-FAWE/src/HeightMap.java

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// $Id$
/*
* WorldEditLibrary
* Copyright (C) 2010 sk89q <http://www.sk89q.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
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import com.sk89q.worldedit.EditSession;
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import com.sk89q.worldedit.MaxChangedBlocksException;
import com.sk89q.worldedit.Vector;
import com.sk89q.worldedit.blocks.BaseBlock;
import com.sk89q.worldedit.filters.HeightMapFilter;
import com.sk89q.worldedit.regions.Region;
/**
* Allows applications of Kernels onto the region's heightmap.
* Currently only used for smoothing (with a GaussianKernel).
*
* @author Grum
*/
public class HeightMap {
private int[] data;
private int width;
private int height;
private Region region;
private EditSession session;
/**
* Constructs the HeightMap
*
* @param session
* @param region
*/
public HeightMap(EditSession session, Region region) {
this.session = session;
this.region = region;
this.width = region.getWidth();
this.height = region.getLength();
int minX = region.getMinimumPoint().getBlockX();
int minY = region.getMinimumPoint().getBlockY();
int minZ = region.getMinimumPoint().getBlockZ();
int maxY = region.getMaximumPoint().getBlockY();
// Store current heightmap data
data = new int[width * height];
for (int z = 0; z < height; z++) {
for (int x = 0; x < width; x++) {
data[z * width + x] = session.getHighestTerrainBlock(x + minX, z + minZ, minY, maxY);
}
}
}
/**
* Apply the filter 'iterations' amount times.
*
* @param filter
* @param iterations
* @return number of blocks affected
* @throws MaxChangedBlocksException
*/
public int applyFilter(HeightMapFilter filter, int iterations) throws MaxChangedBlocksException {
int[] newData = new int[data.length];
System.arraycopy(data, 0, newData, 0, data.length);
for (int i = 0; i < iterations; i++)
newData = filter.filter(newData, width, height);
return apply(newData);
}
/**
* Apply a raw heightmap to the region
*
* @param data
* @return number of blocks affected
* @throws MaxChangedBlocksException
*/
public int apply(int[] data) throws MaxChangedBlocksException {
Vector minY = region.getMinimumPoint();
int originX = minY.getBlockX();
int originY = minY.getBlockY();
int originZ = minY.getBlockZ();
int maxY = region.getMaximumPoint().getBlockY();
BaseBlock fillerAir = new BaseBlock(0);
int blocksChanged = 0;
// Apply heightmap
for (int z = 0; z < height; z++) {
for (int x = 0; x < width; x++) {
int index = z * width + x;
int curHeight = this.data[index];
// Clamp newHeight within the selection area
int newHeight = Math.min(maxY, data[index]);
// Offset x,z to be 'real' coordinates
int X = x + originX;
int Z = z + originZ;
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// We are keeping the topmost blocks so take that in account for the scale
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double scale = (double) (curHeight - originY) / (double) (newHeight - originY);
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// Depending on growing or shrinking we need to start at the bottom or top
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if (newHeight > curHeight) {
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// Set the top block of the column to be the same type (this might go wrong with rounding)
BaseBlock existing = session.getBlock(new Vector(X, curHeight, Z));
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// Skip water/lava
if (existing.getID() < 8 || existing.getID() > 11) {
session.setBlock(new Vector(X, newHeight, Z), existing);
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blocksChanged++;
// Grow -- start from 1 below top replacing airblocks
for (int y = newHeight - 1 - originY; y >= 0; y--) {
int copyFrom = (int) (y * scale);
session.setBlock(new Vector(X, originY + y, Z), session.getBlock(new Vector(X, originY + copyFrom, Z)));
blocksChanged++;
}
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}
} else if (curHeight > newHeight) {
// Shrink -- start from bottom
for (int y = 0; y < newHeight - originY; y++) {
int copyFrom = (int) (y * scale);
session.setBlock(new Vector(X, originY + y, Z), session.getBlock(new Vector(X, originY + copyFrom, Z)));
blocksChanged++;
}
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// Set the top block of the column to be the same type
// (this could otherwise go wrong with rounding)
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session.setBlock(new Vector(X, newHeight, Z), session.getBlock(new Vector(X, curHeight, Z)));
blocksChanged++;
// Fill rest with air
for (int y = newHeight + 1; y <= curHeight; y++) {
session.setBlock(new Vector(X, y, Z), fillerAir);
blocksChanged++;
}
}
}
}
// Drop trees to the floor -- TODO
return blocksChanged;
}
}