private RectNeighbor[] getEdgeAndOffsets(Direction direction, RectifyRectangle neighbor, out int startOffset, out int endIndex)
{
RectNeighbor[] myEdge;
//calculate overlapping areas. e.g. for West:
//if neighbor.bottom < this.bottom, start at neighbor.right[this.bottom]
//if neighbor.bottom > this.bottom, start at neighbor.right[0]
//if neighbor.top > this.top, end at neighbor.right[this.top]
//if neighbor.top < this.top, end at neighbor.right[N]
int neighborStartOffset = 0;
startOffset = 0;
endIndex = 0;
switch (direction)
{
case Direction.East:
//neighborEdge = neighbor.LeftEdge;
myEdge = RightEdge;
//start offsets
if (neighbor.Bottom < this.Bottom)
{
neighborStartOffset = this.Bottom - neighbor.Bottom;
startOffset = 0;
}
else if (neighbor.Bottom > this.Bottom)
{
neighborStartOffset = 0;
startOffset = neighbor.Bottom - this.Bottom;
}
//end index
if (neighbor.Top >= this.Top)
{
endIndex = this.Top - (this.Bottom + startOffset);
}
else if (neighbor.Top < this.Top)
{
endIndex = neighbor.Top - (neighbor.Bottom + neighborStartOffset);
}
break;
case Direction.West:
//neighborEdge = neighbor.RightEdge;
myEdge = LeftEdge;
//start offsets
if (neighbor.Bottom < this.Bottom)
{
neighborStartOffset = this.Bottom - neighbor.Bottom;
startOffset = 0;
}
else if (neighbor.Bottom > this.Bottom)
{
neighborStartOffset = 0;
startOffset = neighbor.Bottom - this.Bottom;
}
//end index
if (neighbor.Top >= this.Top)
{
endIndex = this.Top - (this.Bottom + startOffset);
}
else if (neighbor.Top < this.Top)
{
endIndex = neighbor.Top - (neighbor.Bottom + neighborStartOffset);
}
break;
case Direction.South:
//neighborEdge = neighbor.TopEdge;
myEdge = BottomEdge;
//start offsets
if (neighbor.Left < this.Left)
{
neighborStartOffset = this.Left - neighbor.Left;
startOffset = 0;
}
else if (neighbor.Left > this.Left)
{
neighborStartOffset = 0;
startOffset = neighbor.Left - this.Left;
}
//end index
if (neighbor.Right >= this.Right)
{
endIndex = this.Right - (this.Left + startOffset);
}
else if (neighbor.Right < this.Right)
{
endIndex = neighbor.Right - (neighbor.Left + neighborStartOffset);
}
break;
case Direction.North:
//neighborEdge = neighbor.BottomEdge;
myEdge = TopEdge;
//start offsets
if (neighbor.Left < this.Left)
{
neighborStartOffset = this.Left - neighbor.Left;
startOffset = 0;
}
else if (neighbor.Left > this.Left)
{
neighborStartOffset = 0;
startOffset = neighbor.Left - this.Left;
}
//end index
if (neighbor.Right >= this.Right)
{
endIndex = this.Right - (this.Left + startOffset);
}
else if (neighbor.Right < this.Right)
{
endIndex = neighbor.Right - (neighbor.Left + neighborStartOffset);
}
break;
default:
throw new Exception("Unknown direction for neighbors");
}
return(myEdge);
}
public RectNeighbor(RectifyRectangle neighbor, EdgeType edgeType)
{
this.Neighbor = neighbor;
this.EdgeType = edgeType;
}
