/*
* WorldEdit, a Minecraft world manipulation toolkit
* Copyright (C) sk89q <http://www.sk89q.com>
* Copyright (C) WorldEdit team and contributors
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.sk89q.worldedit.extent.transform;
import com.sk89q.worldedit.Vector;
import com.sk89q.worldedit.WorldEditException;
import com.sk89q.worldedit.blocks.BaseBlock;
import com.sk89q.worldedit.extent.AbstractDelegateExtent;
import com.sk89q.worldedit.extent.Extent;
import com.sk89q.worldedit.math.transform.Transform;
import com.sk89q.worldedit.world.registry.BlockRegistry;
import com.sk89q.worldedit.world.registry.State;
import com.sk89q.worldedit.world.registry.StateValue;
import javax.annotation.Nullable;
import java.util.Map;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Transforms blocks themselves (but not their position) according to a
* given transform.
*/
public class BlockTransformExtent extends AbstractDelegateExtent {
private static final double RIGHT_ANGLE = Math.toRadians(90);
private final Transform transform;
private final BlockRegistry blockRegistry;
/**
* Create a new instance.
*
* @param extent the extent
* @param blockRegistry the block registry used for block direction data
*/
public BlockTransformExtent(Extent extent, Transform transform, BlockRegistry blockRegistry) {
super(extent);
checkNotNull(transform);
checkNotNull(blockRegistry);
this.transform = transform;
this.blockRegistry = blockRegistry;
}
/**
* Get the transform.
*
* @return the transform
*/
public Transform getTransform() {
return transform;
}
/**
* Transform a block without making a copy.
*
* @param block the block
* @param reverse true to transform in the opposite direction
* @return the same block
*/
private BaseBlock transformBlock(BaseBlock block, boolean reverse) {
transform(block, reverse ? transform.inverse() : transform, blockRegistry);
return block;
}
@Override
public BaseBlock getBlock(Vector position) {
return transformBlock(super.getBlock(position), false);
}
@Override
public BaseBlock getLazyBlock(Vector position) {
return transformBlock(super.getLazyBlock(position), false);
}
@Override
public boolean setBlock(Vector location, BaseBlock block) throws WorldEditException {
return super.setBlock(location, transformBlock(new BaseBlock(block), true));
}
/**
* Transform the given block using the given transform.
*
* <p>The provided block is modified.</p>
*
* @param block the block
* @param transform the transform
* @param registry the registry
* @return the same block
*/
public static BaseBlock transform(BaseBlock block, Transform transform, BlockRegistry registry) {
return transform(block, transform, registry, block);
}
/**
* Transform the given block using the given transform.
*
* @param block the block
* @param transform the transform
* @param registry the registry
* @param changedBlock the block to change
* @return the changed block
*/
private static BaseBlock transform(BaseBlock block, Transform transform, BlockRegistry registry, BaseBlock changedBlock) {
checkNotNull(block);
checkNotNull(transform);
checkNotNull(registry);
Map<String, ? extends State> states = registry.getStates(block);
if (states == null) {
return changedBlock;
}
for (State state : states.values()) {
if (state.hasDirection()) {
StateValue value = state.getValue(block);
if (value != null && value.getDirection() != null) {
StateValue newValue = getNewStateValue(state, transform, value.getDirection());
if (newValue != null) {
newValue.set(changedBlock);
}
}
}
}
return changedBlock;
}
/**
* Get the new value with the transformed direction.
*
* @param state the state
* @param transform the transform
* @param oldDirection the old direction to transform
* @return a new state or null if none could be found
*/
@Nullable
private static StateValue getNewStateValue(State state, Transform transform, Vector oldDirection) {
Vector newDirection = transform.apply(oldDirection).subtract(transform.apply(Vector.ZERO)).normalize();
StateValue newValue = null;
double closest = -2;
boolean found = false;
for (StateValue v : state.valueMap().values()) {
if (v.getDirection() != null) {
double dot = v.getDirection().normalize().dot(newDirection);
if (dot >= closest) {
closest = dot;
newValue = v;
found = true;
}
}
}
if (found) {
return newValue;
} else {
return null;
}
}
}