X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=blobdiff_plain;f=src%2Fquadtree.cpp;h=3d5dbeedb954a0d656d225e5b4124ca7d043bbae;hp=2aace7acc912dd8d723241ed9252e5f7ae2f9bf4;hb=326f04a375ce3120f7e8957e3d7cd5f296f513e3;hpb=5f25f354c33142215147b1fa3d18445bd0d7a6ee

diff --git a/src/quadtree.cpp b/src/quadtree.cpp
index 2aace7a..3d5dbee 100644
--- a/src/quadtree.cpp
+++ b/src/quadtree.cpp
@@ -1,5 +1,6 @@
 #ifndef QUADTREE_REMOVED
 #include "quadtree.h"
+#include "document.h"
 
 namespace IPDF {
 
@@ -47,7 +48,7 @@ bool IntersectsQuadChild(const Rect& src, QuadTreeNodeChildren child_type)
 	if (src.y + src.h < dst.y) return false;
 	if (src.x > dst.x + dst.w) return false;
 	if (src.y > dst.y + dst.h) return false;
-	Debug("%s is contained in %s\n", src.Str().c_str(), dst.Str().c_str());
+	//Debug("%s is contained in %s\n", src.Str().c_str(), dst.Str().c_str());
 	return true;
 }
 
@@ -59,10 +60,237 @@ bool ContainedInQuadChild(const Rect& src, QuadTreeNodeChildren child_type)
 	if (src.y < dst.y) return false;
 	if (src.x + src.w > dst.x + dst.w) return false;
 	if (src.y + src.h > dst.y + dst.h) return false;
-	Debug("%s is contained in %s... \n", src.Str().c_str(), dst.Str().c_str());
+	//Debug("%s is contained in %s... \n", src.Str().c_str(), dst.Str().c_str());
 	return true;
 }
 
+
+
+QuadTreeIndex QuadTree::GetNeighbour(QuadTreeIndex start, int xdir, int ydir, Document *addTo) const
+{
+	if (!xdir && !ydir) return start;
+
+	QuadTreeIndex newNode;
+	// Try moving to the right if that's easy.
+	if (xdir > 0)
+	{
+		switch (nodes[start].child_type)
+		{
+		case QTC_TOP_LEFT:
+		case QTC_BOTTOM_LEFT:
+		{
+			if (nodes[start].child_type == QTC_TOP_LEFT)
+			{
+				newNode = nodes[nodes[start].parent].top_right;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(nodes[start].parent, QTC_TOP_RIGHT);
+				}
+			}
+			else
+			{
+				newNode = nodes[nodes[start].parent].bottom_right;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(nodes[start].parent, QTC_BOTTOM_RIGHT);
+				}
+			}	
+			return GetNeighbour(newNode, xdir - 1, ydir, addTo);
+		}
+		case QTC_TOP_RIGHT:
+		case QTC_BOTTOM_RIGHT:
+		{
+			QuadTreeIndex right_parent = GetNeighbour(nodes[start].parent, 1, 0, addTo);
+			if (right_parent == -1) return -1;
+			if (nodes[start].child_type == QTC_TOP_RIGHT)
+			{
+				newNode = nodes[right_parent].top_left;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(right_parent, QTC_TOP_LEFT);
+				}
+			}
+			else
+			{
+				newNode = nodes[right_parent].bottom_left;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(right_parent, QTC_BOTTOM_LEFT);
+				}
+			}
+			return GetNeighbour(newNode, xdir - 1, ydir, addTo);
+		}
+		default:
+			return -1;
+
+		}
+	}
+
+	// Try moving to the left.
+	if (xdir < 0)
+	{
+		switch (nodes[start].child_type)
+		{
+		case QTC_TOP_RIGHT:
+		case QTC_BOTTOM_RIGHT:
+		{
+			if (nodes[start].child_type == QTC_TOP_RIGHT)
+			{
+				newNode = nodes[nodes[start].parent].top_left;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(nodes[start].parent, QTC_TOP_LEFT);
+				}
+			}
+			else
+			{
+				newNode = nodes[nodes[start].parent].bottom_left;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(nodes[start].parent, QTC_BOTTOM_LEFT);
+				}
+			}
+				
+			return GetNeighbour(newNode, xdir + 1, ydir, addTo);
+		}
+		case QTC_TOP_LEFT:
+		case QTC_BOTTOM_LEFT:
+		{
+			QuadTreeIndex left_parent = GetNeighbour(nodes[start].parent, -1, 0, addTo);
+			if (left_parent == -1) return -1;
+			if (nodes[start].child_type == QTC_TOP_LEFT)
+			{
+				newNode = nodes[left_parent].top_right;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(left_parent, QTC_TOP_RIGHT);
+				}
+			}
+			else
+			{
+				newNode = nodes[left_parent].bottom_right;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(left_parent, QTC_BOTTOM_RIGHT);
+				}
+			}
+			return GetNeighbour(newNode, xdir + 1, ydir, addTo);
+		}
+		default:
+			return -1;
+		}
+	}
+	
+	// Try moving to the bottom.
+	if (ydir > 0)
+	{
+		switch (nodes[start].child_type)
+		{
+		case QTC_TOP_LEFT:
+		case QTC_TOP_RIGHT:
+		{
+			if (nodes[start].child_type == QTC_TOP_LEFT)
+			{
+				newNode = nodes[nodes[start].parent].bottom_left;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(nodes[start].parent, QTC_BOTTOM_LEFT);
+				}
+			}
+			else
+			{
+				newNode = nodes[nodes[start].parent].bottom_right;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(nodes[start].parent, QTC_BOTTOM_RIGHT);
+				}
+			}	
+			return GetNeighbour(newNode, xdir, ydir - 1, addTo);
+		}
+		case QTC_BOTTOM_LEFT:
+		case QTC_BOTTOM_RIGHT:
+		{
+			QuadTreeIndex bottom_parent = GetNeighbour(nodes[start].parent, 0, 1, addTo);
+			if (bottom_parent == -1) return -1;
+			if (nodes[start].child_type == QTC_BOTTOM_LEFT)
+			{
+				newNode = nodes[bottom_parent].top_left;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(bottom_parent, QTC_TOP_LEFT);
+				}
+			}
+			else
+			{
+				newNode = nodes[bottom_parent].top_right;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(bottom_parent, QTC_TOP_RIGHT);
+				}
+			}
+			return GetNeighbour(newNode, xdir, ydir - 1, addTo);
+		}
+		default:
+			return -1;
+		}
+	}
+
+	// Try moving up, towards the sky.
+	if (ydir < 0)
+	{
+		switch (nodes[start].child_type)
+		{
+		case QTC_BOTTOM_LEFT:
+		case QTC_BOTTOM_RIGHT:
+		{
+			if (nodes[start].child_type == QTC_BOTTOM_LEFT)
+			{
+				newNode = nodes[nodes[start].parent].top_left;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(nodes[start].parent, QTC_TOP_LEFT);
+				}
+			}
+			else
+			{
+				newNode = nodes[nodes[start].parent].top_right;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(nodes[start].parent, QTC_TOP_RIGHT);
+				}
+			}	
+			return GetNeighbour(newNode, xdir, ydir + 1, addTo);
+		}
+		case QTC_TOP_LEFT:
+		case QTC_TOP_RIGHT:
+		{
+			QuadTreeIndex top_parent = GetNeighbour(nodes[start].parent, 0, -1, addTo);
+			if (top_parent == -1) return -1;
+			if (nodes[start].child_type == QTC_TOP_LEFT)
+			{
+				newNode = nodes[top_parent].bottom_left;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(top_parent, QTC_BOTTOM_LEFT);
+				}
+			}
+			else
+			{
+				newNode = nodes[top_parent].bottom_right;
+				if (addTo && newNode == -1)
+				{
+					newNode = addTo->GenQuadChild(top_parent, QTC_BOTTOM_RIGHT);
+				}
+			}
+			return GetNeighbour(newNode, xdir, ydir + 1, addTo);
+		}
+		default:
+			return -1;
+		}
+	}
+	return -1;
+}
+
 }
 
 #endif