public static Polygon CreateRectInstance(Rectangle shape, List<MeshNode> nodesToUse, List<Polygon> polygons)
{
MeshNode leftUpper = null;
MeshNode rightUpper = null;
MeshNode rightLower = null;
MeshNode leftLower = null;
foreach(MeshNode node in nodesToUse)
{
// ReSharper disable CompareOfFloatsByEqualityOperator
// I expect all node coordinates to be rounding-error-free
if (node.mVector.X == shape.X && node.mVector.Y == shape.Y)
leftUpper = node;
if (node.mVector.X == shape.X+shape.Width && node.mVector.Y == shape.Y)
rightUpper = node;
if (node.mVector.X == shape.X+shape.Width && node.mVector.Y == shape.Y+shape.Height)
rightLower = node;
if (node.mVector.X == shape.X && node.mVector.Y == shape.Y+shape.Height)
leftLower = node;
// ReSharper restore CompareOfFloatsByEqualityOperator
}
if (leftUpper == null)
{
leftUpper = new MeshNode(shape.X, shape.Y);
nodesToUse.Add(leftUpper);
foreach (Polygon polygon in polygons) polygon.TrySplit(leftUpper);
}
if (rightUpper == null)
{
rightUpper = new MeshNode(shape.X+shape.Width, shape.Y);
nodesToUse.Add(rightUpper);
foreach (Polygon polygon in polygons) polygon.TrySplit(rightUpper);
}
if (rightLower == null)
{
rightLower = new MeshNode(shape.X+shape.Width, shape.Y+shape.Height);
nodesToUse.Add(rightLower);
foreach (Polygon polygon in polygons) polygon.TrySplit(rightLower);
}
if (leftLower == null)
{
leftLower = new MeshNode(shape.X, shape.Y+shape.Height);
nodesToUse.Add(leftLower);
foreach (Polygon polygon in polygons) polygon.TrySplit(leftLower);
}
Polygon result = new Polygon(new List<MeshNode> {leftUpper, rightUpper, rightLower, leftLower});
foreach (MeshNode node in nodesToUse) result.TrySplit(node);
return result;
}
