internal void Prime(Geometry geometry)
{
_isOutside = true;
if (_isPrimed) return;
for (int i = 0; i < 4; i++) {
_gridPoints[i].Prime(geometry);
if (!_gridPoints[i].IsOutside) { _isOutside = false; }
}
_isPrimed = true;
}
internal void Prime(Geometry geometry)
{
//Calculate signed distance and normal
if (_isPrimed) return;
Feature nearestFeature = geometry.GetNearestFeature(_position);
//determine if inside or outside of geometry.
Vector2 pointToFeaturePosition = Vector2.Subtract(_position, nearestFeature.Position);
float dot = Vector2.Dot(pointToFeaturePosition, nearestFeature.Normal);
if (dot < 0) {
_distance = -nearestFeature.Distance;
}
else {
_distance = nearestFeature.Distance;
}
_isPrimed = true;
}
internal Grid(Geometry geometry, float gridCellSize, float padding, bool primeTheGrid)
{
GridConstructor(geometry, gridCellSize, padding, primeTheGrid);
}
internal Grid(Geometry geometry, float gridCellSize, bool primeTheGrid)
{
if (geometry.LocalVertices.Count < 3) { throw new InvalidOperationException("A grid can only be constructed for geometries with 3 vertices or more"); }
GridConstructor(geometry,gridCellSize, 0, primeTheGrid);
}
private void GridConstructor(Geometry geometry, float gridCellSize, float padding, bool primeTheGrid)
{
_geometry = geometry;
_padding = padding;
GridCellSize = gridCellSize;
Initialize();
if (primeTheGrid) {
Prime();
}
}