/// <summary>
/// Construct a GridPlacementRule from closest points using a set of reference anchors. Each polyline vertex will be associated with its closest anchor.
/// </summary>
/// <param name="cell">The definition of the grid cell.</param>
/// <param name="gridArea">The region in which to lay out the grid.</param>
/// <param name="Anchors">The reference anchors from which to calculate the associations.</param>
/// <param name="name">The name.</param>
/// <param name="gridCreationRule">An optional function to apply to the grid to override its default subdivision.</param>
public static GridPlacementRule FromClosestPoints(GridCellDefinition cell, Polygon gridArea, IList <Vector3> Anchors, string name, Action <Grid2d> gridCreationRule = null)
{
var anchorIndices = new List <int>();
var anchorDisplacements = new List <Vector3>();
foreach (var v in gridArea.Vertices)
{
var closestAnchorIndex = Enumerable.Range(0, Anchors.Count).OrderBy(a => Anchors[a].DistanceTo(v)).First();
anchorIndices.Add(closestAnchorIndex);
var closestAnchor = Anchors[closestAnchorIndex];
anchorDisplacements.Add(v - closestAnchor);
}
return(new GridPlacementRule(cell, gridArea, anchorIndices, anchorDisplacements, name, gridCreationRule));
}
/// <summary>
/// Construct a new grid placement rule from scratch.
/// </summary>
/// <param name="definition">The grid cell definition.</param>
/// <param name="gridArea">The region in which to lay out the grid.</param>
/// <param name="anchorIndices">For each vertex, the index of the corresponding anchor.</param>
/// <param name="anchorDisplacements">For each vertex, the displacement from its anchor.</param>
/// <param name="name">The name.</param>
/// <param name="gridCreationRule">An optional action that handles subdividing the created Grid2d.</param>
public GridPlacementRule(GridCellDefinition definition, Polygon gridArea, IList <int> anchorIndices, IList <Vector3> anchorDisplacements, string name, Action <Grid2d> gridCreationRule = null)
{
Curve = gridArea;
AnchorIndices = anchorIndices;
AnchorDisplacements = anchorDisplacements;
Name = name;
CellDefinition = definition;
if (gridCreationRule == null)
{
GridCreationRule = (Grid2d g) =>
{
g.U.DivideByFixedLength(CellDefinition.CellLength, FixedDivisionMode.RemainderAtBothEnds);
g.V.DivideByFixedLength(CellDefinition.CellWidth, FixedDivisionMode.RemainderAtBothEnds);
};
}
else
{
GridCreationRule = gridCreationRule;
}
}