From ef8b77b0f3ab470a8981a0ebde525744fef7ebfa Mon Sep 17 00:00:00 2001
From: TomyLobo <tomylobo@nurfuerspam.de>
Date: Sun, 14 Jul 2024 09:14:00 +0200
Subject: [PATCH] Add clipboard support to //deform

---
 .../worldedit/command/RegionCommands.java     | 25 ++++++++++++++++---
 .../internal/util/TransformUtil.java          | 23 ++++++++++++++---
 2 files changed, 40 insertions(+), 8 deletions(-)

diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/command/RegionCommands.java b/worldedit-core/src/main/java/com/sk89q/worldedit/command/RegionCommands.java
index c24c4cb1de..3469a765f0 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/command/RegionCommands.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/command/RegionCommands.java
@@ -33,6 +33,7 @@
 import com.sk89q.worldedit.extent.Extent;
 import com.sk89q.worldedit.extent.InputExtent;
 import com.sk89q.worldedit.extent.clipboard.BlockArrayClipboard;
+import com.sk89q.worldedit.extent.clipboard.Clipboard;
 import com.sk89q.worldedit.function.GroundFunction;
 import com.sk89q.worldedit.function.RegionFunction;
 import com.sk89q.worldedit.function.block.BlockReplace;
@@ -50,6 +51,7 @@
 import com.sk89q.worldedit.internal.expression.ExpressionException;
 import com.sk89q.worldedit.internal.util.TransformUtil;
 import com.sk89q.worldedit.math.BlockVector3;
+import com.sk89q.worldedit.math.Vector3;
 import com.sk89q.worldedit.math.convolution.GaussianKernel;
 import com.sk89q.worldedit.math.convolution.HeightMap;
 import com.sk89q.worldedit.math.convolution.HeightMapFilter;
@@ -499,13 +501,28 @@ public int deform(Actor actor, LocalSession session, EditSession editSession,
                       @Switch(name = 'o', desc = "Use the placement's coordinate origin")
                           boolean offsetPlacement,
                       @Switch(name = 'c', desc = "Use the selection's center as origin")
-                          boolean offsetCenter) throws WorldEditException {
+                          boolean offsetCenter,
+                      @Switch(name = 'l', desc = "Fetch from the clipboard instead of the world")
+                          boolean useClipboard) throws WorldEditException {
+        final Transform targetTransform = TransformUtil.createTransformForExpressionCommand(actor, session, region, useRawCoords, offsetPlacement, offsetCenter);
 
-        final Transform transform = TransformUtil.createTransformForExpressionCommand(actor, session, region, useRawCoords, offsetPlacement, offsetCenter);
-        final InputExtent inputExtent = editSession.getWorld();
+        final InputExtent sourceExtent;
+        final Transform sourceTransform;
+        if (useClipboard) {
+            final Clipboard clipboard = session.getClipboard().getClipboard();
+            sourceExtent = clipboard;
+
+            final Vector3 clipboardMin = clipboard.getMinimumPoint().toVector3();
+            final Vector3 clipboardMax = clipboard.getMaximumPoint().toVector3();
+
+            sourceTransform = TransformUtil.createTransformForExpressionCommand(useRawCoords, offsetPlacement, offsetCenter, clipboardMin, clipboardMax, clipboardMin);
+        } else {
+            sourceExtent = editSession.getWorld();
+            sourceTransform = targetTransform;
+        }
 
         try {
-            final int affected = editSession.deformRegion(region, transform, String.join(" ", expression), session.getTimeout(), inputExtent, transform);
+            final int affected = editSession.deformRegion(region, targetTransform, String.join(" ", expression), session.getTimeout(), sourceExtent, sourceTransform);
             if (actor instanceof Player) {
                 ((Player) actor).findFreePosition();
             }
diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/internal/util/TransformUtil.java b/worldedit-core/src/main/java/com/sk89q/worldedit/internal/util/TransformUtil.java
index 5093efd144..0a11e41c27 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/internal/util/TransformUtil.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/internal/util/TransformUtil.java
@@ -48,18 +48,33 @@ private TransformUtil() {
      * @return                A transform from the expression coordinate system to the raw coordinate system
      */
     public static Transform createTransformForExpressionCommand(Actor actor, LocalSession session, Region region, boolean useRawCoords, boolean offsetPlacement, boolean offsetCenter) throws IncompleteRegionException {
+        final Vector3 placement = session.getPlacementPosition(actor).toVector3();
+        final Vector3 min = region.getMinimumPoint().toVector3();
+        final Vector3 max = region.getMaximumPoint().toVector3();
+
+        return createTransformForExpressionCommand(useRawCoords, offsetPlacement, offsetCenter, min, max, placement);
+    }
+
+    /**
+     * Creates a {@link Transform} for the //deform command with clipboard support.
+     *
+     * @param useRawCoords    Use the game's coordinate origin
+     * @param offsetPlacement Use the placement's coordinate origin
+     * @param offsetCenter    Use the selection's center as origin
+     * @param min             Minimum of the selection/clipboard
+     * @param max             Maximum of the selection/clipboard
+     * @param placement       Placement position
+     * @return                A transform from the expression coordinate system to the world/clipboard coordinate system
+     */
+    public static Transform createTransformForExpressionCommand(boolean useRawCoords, boolean offsetPlacement, boolean offsetCenter, Vector3 min, Vector3 max, Vector3 placement) {
         if (useRawCoords) {
             return new Identity();
         }
 
         if (offsetPlacement) {
-            final Vector3 placement = session.getPlacementPosition(actor).toVector3();
-
             return new SimpleTransform(placement, Vector3.ONE);
         }
 
-        final Vector3 min = region.getMinimumPoint().toVector3();
-        final Vector3 max = region.getMaximumPoint().toVector3();
         final Vector3 center = max.add(min).multiply(0.5);
 
         if (offsetCenter) {