public HeightmapMarginWithInfo UpdateWherePossible(HeightmapMarginWithInfo newMargin)
{
//Preconditions.Assert( _heightmapMargin.Length == newMargin.HeightmapLength, todo change not to length but to lods
// string.Format("Current margin length is {0} != new margin length == {1} ", _heightmapMargin.Length, newMargin.HeightmapLength));
Preconditions.Assert(
(newMargin.Position.IsHorizontal && Position.IsHorizontal) ||
(newMargin.Position.IsVertical && Position.IsVertical),
string.Format("Current and new margins are one vertical one horizontal: Old {0} new {1}",
_heightmapMargin, newMargin));
bool haveCommonElements = Position.HaveCommonElementWith(newMargin.Position);
Preconditions.Assert(haveCommonElements,
string.Format("Current {0} and new {1} margin dont have common elements", HeightmapMargin, newMargin));
MarginPosition commonSegment = Position.GetCommonSegment(newMargin.Position);
var ourStartPercent = Position.InvLerp(commonSegment.StartPoint);
var ourStartOffset = (int)Math.Round((double)HeightmapWorkingLength * ourStartPercent);
var ourEndPercent = Position.InvLerp(commonSegment.EndPoint);
var ourEndOffset = (int)Math.Round((double)HeightmapWorkingLength * ourEndPercent);
var theirStartPercent = newMargin.Position.InvLerp(commonSegment.StartPoint);
var theirStartOffset = (int)Math.Round((double)newMargin.HeightmapWorkingLength * theirStartPercent);
var theirEndPercent = newMargin.Position.InvLerp(commonSegment.EndPoint);
var theirEndOffset = (int)Math.Round((double)newMargin.HeightmapWorkingLength * theirEndPercent);
return(new HeightmapMarginWithInfo(
SetMarginSubElement(ourStartOffset, ourEndOffset, theirStartOffset, theirEndOffset, newMargin),
Position, LodFactor));
}
public bool HaveCommonElementWith(MarginPosition position)
{
if (!((IsVertical && position.IsVertical) || (IsHorizontal && position.IsHorizontal)))
{
return(false);
}
if (IsVertical)
{
if (StartPoint.X != position.StartPoint.X)
{
return(false);
}
else
{
return(MathHelp.SegmentsHaveCommonElement(StartPoint.Y, EndPoint.Y, position.StartPoint.Y,
position.EndPoint.Y));
}
}
else
{
if (StartPoint.Y != position.StartPoint.Y)
{
return(false);
}
else
{
return(MathHelp.SegmentsHaveCommonElement(StartPoint.X, EndPoint.X, position.StartPoint.X,
position.EndPoint.X));
}
}
}
public MarginPosition GetCommonSegment(MarginPosition other)
{
Preconditions.Assert(HaveCommonElementWith(other),
string.Format("Cant get common element of margins {0} and {1} - they have no common element ", this,
other));
if (IsHorizontal)
{
return(new MarginPosition(
new Point2D(Math.Max(StartPoint.X, other.StartPoint.X), StartPoint.Y),
new Point2D(Math.Min(EndPoint.X, other.EndPoint.X), EndPoint.Y)));
}
else
{
return(new MarginPosition(
new Point2D(StartPoint.X, Math.Max(StartPoint.Y, other.StartPoint.Y)),
new Point2D(EndPoint.X, Math.Min(EndPoint.Y, other.EndPoint.Y))));
}
}
public HeightmapMarginWithInfo(HeightmapMargin heightmapMargin, MarginPosition position, int lodFactor)
{
_heightmapMargin = heightmapMargin;
_position = position;
_lodFactor = lodFactor;
}
