added a 'create' option to copyBlocksFrom and getChunkSlices.

infiniteworld.py

@@ -2495,7 +2495,7 @@ class MCInfdevOldLevel(EntityLevel):
                 return slice(None, None)
         return sourceMask
 
-    def copyBlocksFromFiniteIter(self, sourceLevel, sourceBox, destinationPoint, blocksToCopy):
+    def copyBlocksFromFiniteIter(self, sourceLevel, sourceBox, destinationPoint, blocksToCopy, create = False):
         #assumes destination point and bounds have already been checked.
         (sx, sy, sz) = sourceBox.origin
 
@@ -2561,7 +2561,7 @@ class MCInfdevOldLevel(EntityLevel):
 
             #chunk.compress(); #xxx find out why this trashes changes to tile entities
 
-    def copyBlocksFromInfiniteIter(self, sourceLevel, sourceBox, destinationPoint, blocksToCopy):
+    def copyBlocksFromInfiniteIter(self, sourceLevel, sourceBox, destinationPoint, blocksToCopy, create = False):
         """ copy blocks between two infinite levels via repeated export/import.  hilariously slow. """
 
         #assumes destination point and bounds have already been checked.
@@ -2569,8 +2569,20 @@ class MCInfdevOldLevel(EntityLevel):
         chunkCount = destBox.chunkCount
         i = 0
         sourceMask = self.sourceMaskFunc(blocksToCopy)
-
-        for chunk, slices, point in self.getChunkSlices(destBox):
+        
+        def subbox(slices, point):
+            size = [s.stop - s.start for s in slices]
+            size[1], size[2] = size[2], size[1]
+            return BoundingBox([p + a for p, a in zip(point, sourceBox.origin)], size)
+            
+        def shouldCreateFunc(slices, point):
+            box = subbox(slices, point)
+            b = any(list(sourceLevel.containsChunk(*c) for c in box.chunkPositions)) #any() won't take a generator-expression :(
+            if b == False:
+                print 'Skipped ', list(box.chunkPositions)
+            return b
+            
+        for chunk, slices, point in self.getChunkSlices(destBox, create=(create and shouldCreateFunc)):
             i += 1
             yield (i, chunkCount)
             if i % 100 == 0:
@@ -2578,9 +2590,7 @@ class MCInfdevOldLevel(EntityLevel):
 
             dstblocks = chunk.Blocks[slices]
             dstdata = chunk.Data[slices]
-            size = [s.stop - s.start for s in slices]
-            size[1], size[2] = size[2], size[1]
-            sourceSubBox = BoundingBox([p + a for p, a in zip(point, sourceBox.origin)], size)
+            sourceSubBox = subbox(slices, point)
             for srcchunk, srcslices, srcpoint in sourceLevel.getChunkSlices(sourceSubBox):
                 srcpoint = srcpoint[0], srcpoint[2], srcpoint[1]
                 sourceBlocks = srcchunk.Blocks[srcslices]
@@ -2597,10 +2607,10 @@ class MCInfdevOldLevel(EntityLevel):
 
 
 
-    def copyBlocksFrom(self, sourceLevel, sourceBox, destinationPoint, blocksToCopy=None, entities=True):
-        return exhaust(self.copyBlocksFromIter(sourceLevel, sourceBox, destinationPoint, blocksToCopy, entities))
+    def copyBlocksFrom(self, sourceLevel, sourceBox, destinationPoint, blocksToCopy=None, entities=True, create=False):
+        return exhaust(self.copyBlocksFromIter(sourceLevel, sourceBox, destinationPoint, blocksToCopy, entities, create))
 
-    def copyBlocksFromIter(self, sourceLevel, sourceBox, destinationPoint, blocksToCopy=None, entities=True):
+    def copyBlocksFromIter(self, sourceLevel, sourceBox, destinationPoint, blocksToCopy=None, entities=True, create=False):
         (x, y, z) = destinationPoint;
         (lx, ly, lz) = sourceBox.size
         #sourcePoint, sourcePoint1 = sourceBox
@@ -2611,12 +2621,12 @@ class MCInfdevOldLevel(EntityLevel):
         startTime = datetime.now()
 
         if(not isinstance(sourceLevel, MCInfdevOldLevel)):
-            for i in self.copyBlocksFromFiniteIter(sourceLevel, sourceBox, destinationPoint, blocksToCopy):
+            for i in self.copyBlocksFromFiniteIter(sourceLevel, sourceBox, destinationPoint, blocksToCopy, create):
                 yield i
 
 
         else:
-            for i in self.copyBlocksFromInfiniteIter(sourceLevel, sourceBox, destinationPoint, blocksToCopy):
+            for i in self.copyBlocksFromInfiniteIter(sourceLevel, sourceBox, destinationPoint, blocksToCopy, create):
                 yield i
 
         for i in self.copyEntitiesFromIter(sourceLevel, sourceBox, destinationPoint, entities):

level.py

@@ -180,8 +180,10 @@ class MCLevel(object):
 
             yield (chunk, slices, (xPos * 16 - x, 0, zPos * 16 - z))
 
-
-    def getChunkSlices(self, box):
+    def getChunkSlicesCreating(self, box): 
+        return self.getChunkSlices(box, create=True)
+        
+    def getChunkSlices(self, box, create=False):
         """ call this method to iterate through a large slice of the world by 
             visiting each chunk and indexing its data with a subslice.
         
@@ -194,6 +196,9 @@ class MCLevel(object):
         and the 'offset' triplet. x,z,y ordering is used only
         to index arrays, since it reflects the order of the blocks in memory.
         In all other places, including an entity's 'Pos', the order is x,y,z. 
+        
+        'create' controls whether to create absent chunks or skip over them.
+        create can be False, True, or a function of (slices, point) 
         """
         level = self
 
@@ -229,14 +234,21 @@ class MCLevel(object):
                     localMaxZ = maxzoff
                 newMinZ = localMinZ + (cz << 4) - box.minz
                 newMaxZ = localMaxZ + (cz << 4) - box.minz
-                try:
-                    ch = level.getChunk(cx, cz)
-                except ChunkNotPresent, e:
-                    continue;
-
-                yield           (ch,
-                                (slice(localMinX, localMaxX), slice(localMinZ, localMaxZ), slice(miny, maxy)),
-                                (newMinX, newMinY, newMinZ))
+                slices, point = (
+                    (slice(localMinX, localMaxX), slice(localMinZ, localMaxZ), slice(miny, maxy)),
+                    (newMinX, newMinY, newMinZ)
+                )
+                
+                if not level.containsChunk(cx,cz):
+                    if create and hasattr(level, 'createChunk'):
+                        if not hasattr(create, "__call__") or create(slices, point):
+                            level.createChunk(cx,cz)
+                        else:
+                            continue
+                    else:
+                        continue;
+                chunk = level.getChunk(cx,cz)
+                yield chunk, slices, point
 
 
     def containsPoint(self, x, y, z):

mce.py

@@ -522,9 +522,8 @@ class mce(object):
         importLevel = mclevel.fromFile(filename)
 
         destBox = BoundingBox(destPoint, importLevel.size)
-        self.level.createChunksInBox(destBox);
 
-        self.level.copyBlocksFrom(importLevel, importLevel.bounds, destPoint, blocksToCopy);
+        self.level.copyBlocksFrom(importLevel, importLevel.bounds, destPoint, blocksToCopy, create=True);
 
 
         self.needsSave = True;

schematic.py

@@ -516,21 +516,7 @@ def extractZipSchematicFromIter(sourceLevel, box, zipfilename=None, entities=Tru
 
     destBox = BoundingBox(destPoint, sourceBox.size);
 
-    if (sourceBox.isChunkAligned):
-        #create chunks in the destination area corresponding only to chunks
-        #present in the source
-        chunks = sourceBox.chunkPositions
-        destChunks = destBox.chunkPositions
-        chunkIter = itertools.izip(chunks, destChunks)
-
-        for i, (src, chunk) in enumerate(chunkIter):
-            if sourceLevel.containsChunk(*src):
-                tempSchematic.createChunk(*chunk)
-            yield i, sourceBox.chunkCount
-    else:
-        tempSchematic.createChunksInBox(destBox)
-
-    for i in tempSchematic.copyBlocksFromIter(sourceLevel, sourceBox, destPoint, entities=entities):
+    for i in tempSchematic.copyBlocksFromIter(sourceLevel, sourceBox, destPoint, entities=entities, create=True):
         yield i
     tempSchematic.saveInPlace(); #lights not needed for this format - crashes minecraft though