save progress pos (#715)

Save the last iterator pos before setting a new one as "prev progress pos". Only reset to this point when restarting (saves going back too far).

Author: Raycoms

src/main/java/com/ldtteam/structurize/placement/AbstractBlueprintIterator.java

@@ -15,16 +15,21 @@
  */
 public abstract class AbstractBlueprintIterator implements IBlueprintIterator
 {
-
     /**
      * The position we use as our uninitialized value.
      */
     public static final BlockPos NULL_POS = new BlockPos(-1, -1, -1);
+
     /**
      * The Structure position we are at. Defaulted to NULL_POS.
      */
     protected final BlockPos.MutableBlockPos progressPos = new BlockPos.MutableBlockPos(-1, -1, -1);
 
+    /**
+     * The previous position before the current progress position.
+     */
+    protected final BlockPos.MutableBlockPos prevProgressPos = new BlockPos.MutableBlockPos(-1, -1, -1);
+
     /**
      * The size of the structure.
      */
@@ -118,6 +123,7 @@ else if (!isRemoving() && BlockUtils.areBlockStatesEqual(info.getBlockInfo().get
     @Override
     public void setProgressPos(final BlockPos localPosition)
     {
+        this.prevProgressPos.set(this.progressPos);
         if (localPosition.equals(NULL_POS))
         {
             this.progressPos.set(localPosition);
@@ -163,6 +169,7 @@ public boolean isRemoving()
     @Override
     public void reset()
     {
+        prevProgressPos.set(NULL_POS);
         progressPos.set(NULL_POS);
         includeEntities = false;
         isRemoving = false;
@@ -180,6 +187,12 @@ public BlockPos getProgressPos()
         return progressPos.immutable();
     }
 
+    @Override
+    public BlockPos getPrevProgressPos()
+    {
+        return prevProgressPos.immutable();
+    }
+
     protected IStructureHandler getStructureHandler()
     {
         return structureHandler;

src/main/java/com/ldtteam/structurize/placement/BlueprintIteratorDefault.java

@@ -31,6 +31,7 @@ public Result increment()
 
     private Result iterate(boolean up)
     {
+        this.prevProgressPos.set(this.progressPos);
         if (this.progressPos.equals(NULL_POS))
         {
             this.progressPos.set(-1, up ? 0 : this.size.getY() -1, 0);

src/main/java/com/ldtteam/structurize/placement/BlueprintIteratorHilbert.java

@@ -31,6 +31,7 @@ public BlueprintIteratorHilbert(@NotNull final IStructureHandler structureHandle
     @Override
     public Result increment()
     {
+        this.prevProgressPos.set(this.progressPos);
         if (this.progressPos.equals(NULL_POS))
         {
             this.index = 0;
@@ -44,6 +45,7 @@ public Result increment()
     @Override
     public Result decrement()
     {
+        this.prevProgressPos.set(this.progressPos);
         if (this.progressPos.equals(NULL_POS))
         {
             this.index = (this.size.getY() & 1) == 0 ? this.positions.size() - 1 : 0;

src/main/java/com/ldtteam/structurize/placement/BlueprintIteratorInwardCircle.java

@@ -32,6 +32,7 @@ public BlueprintIteratorInwardCircle(final IStructureHandler structureHandler)
      */
     public Result iterate(final boolean up)
     {
+        this.prevProgressPos.set(this.progressPos);
         if (this.progressPos.equals(NULL_POS))
         {
             this.progressPos.set(-1, up ? 0 : this.size.getY() - 1, 0);

src/main/java/com/ldtteam/structurize/placement/BlueprintIteratorInwardCircleHeight.java

@@ -22,6 +22,7 @@ public BlueprintIteratorInwardCircleHeight(final IStructureHandler structureHand
     @Override
     public Result increment()
     {
+        this.prevProgressPos.set(this.progressPos);
         if (this.progressPos.equals(NULL_POS))
         {
             this.progressPos.set(0, 0, 0);
@@ -42,6 +43,7 @@ public Result increment()
     @Override
     public Result decrement()
     {
+        this.prevProgressPos.set(this.progressPos);
         if (this.progressPos.equals(NULL_POS))
         {
             this.progressPos.set(0, topRightCorner.getY(), 0);

src/main/java/com/ldtteam/structurize/placement/BlueprintIteratorRandom.java

@@ -43,6 +43,7 @@ public BlueprintIteratorRandom(final IStructureHandler structureHandler)
      */
     public Result increment()
     {
+        this.prevProgressPos.set(this.progressPos);
         if (this.progressPos.equals(NULL_POS))
         {
             this.progressPos.set(this.positions.get(0).getX(), 0, this.positions.get(0).getZ());
@@ -75,6 +76,7 @@ public Result increment()
      */
     public Result decrement()
     {
+        this.prevProgressPos.set(this.progressPos);
         if (this.progressPos.equals(NULL_POS))
         {
             this.progressPos.set(this.positions.get(0).getX(), this.size.getY() - 1, this.positions.get(0).getZ());

src/main/java/com/ldtteam/structurize/placement/IBlueprintIterator.java

@@ -83,6 +83,12 @@ public interface IBlueprintIterator
      */
     BlockPos getProgressPos();
 
+    /**
+     * Get the last position before the progress pos of the iterator.
+     * @return the prev progress pos.
+     */
+    BlockPos getPrevProgressPos();
+
     /**
      * Get the size of the blueprint which is iterated over
      * @return the size

src/main/java/com/ldtteam/structurize/placement/StructurePlacer.java

@@ -120,6 +120,7 @@ public StructurePhasePlacementResult executeStructureStep(
         {
             final BlockPos localPos = iterator.getProgressPos();
             final BlockPos worldPos = handler.getProgressPosInWorld(localPos);
+            lastPos = iterator.getPrevProgressPos();
 
             if (count >= handler.getStepsPerCall())
             {
@@ -129,7 +130,6 @@ public StructurePhasePlacementResult executeStructureStep(
             final BlockState localState = handler.getBluePrint().getBlockState(localPos);
             if (localState == null || world.isOutsideBuildHeight(worldPos))
             {
-                lastPos = localPos;
                 iterationResult = iterateFunction.get();
                 continue;
             }