131 lines
4.2 KiB
Java
131 lines
4.2 KiB
Java
/*
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* WorldEdit, a Minecraft world manipulation toolkit
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* Copyright (C) sk89q <http://www.sk89q.com>
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* Copyright (C) WorldEdit team and contributors
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.sk89q.worldedit.function.visitor;
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import static com.google.common.base.Preconditions.checkArgument;
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import static com.google.common.base.Preconditions.checkNotNull;
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import com.sk89q.worldedit.Vector;
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import com.sk89q.worldedit.Vector2D;
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import com.sk89q.worldedit.WorldEditException;
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import com.sk89q.worldedit.function.LayerFunction;
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import com.sk89q.worldedit.function.mask.Mask2D;
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import com.sk89q.worldedit.function.mask.Masks;
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import com.sk89q.worldedit.function.operation.Operation;
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import com.sk89q.worldedit.function.operation.Operations;
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import com.sk89q.worldedit.function.operation.RunContext;
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import com.sk89q.worldedit.regions.FlatRegion;
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/**
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* Visits the layers within a region.
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*
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* <p>This class works by iterating over all the columns in a {@link FlatRegion},
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* finding the first ground block in each column (searching from a given
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* maximum Y down to a minimum Y), and then applies a {@link LayerFunction} to
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* each layer.</p>
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*/
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public class LayerVisitor implements Operation {
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private final LayerFunction function;
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private Mask2D mask = Masks.alwaysTrue2D();
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private final int minY;
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private final int maxY;
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private final Iterable<Vector2D> iterator;
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/**
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* Create a new visitor.
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*
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* @param flatRegion the flat region to visit
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* @param minY the minimum Y to stop the search at
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* @param maxY the maximum Y to begin the search at
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* @param function the layer function to apply t blocks
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*/
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public LayerVisitor(final FlatRegion flatRegion, final int minY, final int maxY, final LayerFunction function) {
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checkNotNull(flatRegion);
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checkArgument(minY <= maxY, "minY <= maxY required");
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checkNotNull(function);
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this.minY = minY;
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this.maxY = maxY;
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this.function = function;
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iterator = flatRegion.asFlatRegion();
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}
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/**
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* Get the mask that determines which columns within the flat region
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* will be visited.
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*
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* @return a 2D mask
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*/
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public Mask2D getMask() {
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return mask;
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}
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/**
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* Set the mask that determines which columns within the flat region
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* will be visited.
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*
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* @param mask a 2D mask
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*/
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public void setMask(final Mask2D mask) {
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checkNotNull(mask);
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this.mask = mask;
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}
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@Override
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public Operation resume(final RunContext run) throws WorldEditException {
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for (final Vector2D column : iterator) {
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if (!mask.test(column)) {
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continue;
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}
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// Abort if we are underground
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if (function.isGround(column.toVector(maxY + 1))) {
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return null;
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}
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boolean found = false;
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int groundY = 0;
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for (int y = maxY; y >= minY; --y) {
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final Vector test = column.toVector(y);
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if (!found) {
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if (function.isGround(test)) {
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found = true;
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groundY = y;
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}
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}
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if (found) {
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if (!function.apply(test, groundY - y)) {
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break;
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}
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}
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}
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}
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return null;
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}
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@Override
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public void cancel() {}
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public static Class<?> inject() {
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return Operations.class;
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}
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}
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