public void Transform(IEnumerable <UV> values)
{
UnitConversion.Transform(values, this.FromUnit, this.ToUnit);
}
public void Transform(UV val)
{
UnitConversion.Transform(val, this.FromUnit, this.ToUnit);
}
public void Transform(IList <double> values)
{
UnitConversion.Transform(values, this.FromUnit, this.ToUnit);
}
public double Convert(double length, int decimalRoundingFactor)
{
return(UnitConversion.Convert(length, this.FromUnit, this.ToUnit, decimalRoundingFactor));
}
public double Convert(double length)
{
return(UnitConversion.Convert(length, this.FromUnit, this.ToUnit));
}
/// <summary>
/// Gets the Isovist polygon.
/// </summary>
/// <param name="vantagePoint">The vantage point.</param>
/// <param name="viewDepth">The view depth.</param>
/// <param name="edges">The edges.</param>
/// <returns>BarrierPolygons.</returns>
public BarrierPolygon IsovistPolygon(UV vantagePoint, double viewDepth, HashSet <UVLine> edges)
{
/*first and expand and shrink operation is performed to merge the shadowing edges*/
double expandShrinkFactor = Math.Pow(10.0, this.PolygonalBooleanPrecision) * UnitConversion.Convert(0.075, Length_Unit_Types.FEET, UnitType);
//offsetting the excluded area of each edge
INTPolygons offsetedPolygons = new INTPolygons();
ClipperOffset clipperOffset = new ClipperOffset();
foreach (UVLine edgeItem in edges)
{
clipperOffset.AddPath(this.excludedArea(vantagePoint, viewDepth + 1, edgeItem), ClipperLib.JoinType.jtMiter, EndType.etClosedPolygon);
INTPolygons plygns = new INTPolygons();
clipperOffset.Execute(ref plygns, expandShrinkFactor);
offsetedPolygons.AddRange(plygns);
clipperOffset.Clear();
}
//Unioning the expanded exclusions
INTPolygons offsetUnioned = new INTPolygons();
Clipper c = new Clipper();
c.AddPaths(offsetedPolygons, PolyType.ptSubject, true);
c.Execute(ClipType.ctUnion, offsetUnioned, PolyFillType.pftNonZero, PolyFillType.pftNonZero);
//shrink the polygons to retain their original size
INTPolygons results = new INTPolygons();
clipperOffset.Clear();
clipperOffset.AddPaths(offsetUnioned, JoinType.jtMiter, EndType.etClosedPolygon);
clipperOffset.Execute(ref results, -expandShrinkFactor);
clipperOffset.Clear();
offsetUnioned.Clear();
/*
* What ever is a hole in the resulting mereged polygon is the visibility polygon
* Now we classify the polygons based on being a hole or not
*/
//filtering out the holes that do not include the center
INTPolygons holesNOT = new INTPolygons();
INTPolygons holesIncludingCenter = new INTPolygons();
IntPoint iCenter = ConvertUVToIntPoint(vantagePoint);
foreach (INTPolygon item in results)
{
if (!Clipper.Orientation(item))
{
if (Clipper.PointInPolygon(iCenter, item) == 1)
{
holesIncludingCenter.Add(item);
}
}
else
{
holesNOT.Add(item);
}
}
if (holesIncludingCenter.Count == 0)
{
//there is no hole. The shadow polygones should clip the potential field of visibility (i.e. circle) by an subtraction operation
INTPolygon circle = createCircle(vantagePoint, viewDepth);
//subtraction
c.Clear();
c.AddPath(circle, PolyType.ptSubject, true);
c.AddPaths(holesNOT, PolyType.ptClip, true);
INTPolygons isovistPolygon = new INTPolygons();
c.Execute(ClipType.ctDifference, isovistPolygon);
//searching for a polygon that includes the center
foreach (INTPolygon item in isovistPolygon)
{
if (Clipper.PointInPolygon(iCenter, item) == 1)
{
BarrierPolygon isovist = this.ConvertINTPolygonToBarrierPolygon(item);
results = null;
c = null;
clipperOffset = null;
offsetedPolygons = null;
circle = null;
holesNOT = null;
holesIncludingCenter = null;
isovistPolygon = null;
return(isovist);
}
}
MessageBox.Show(string.Format("Isovist not found!\nNo hole detected\n{0} polygons can be isovist", isovistPolygon.Count.ToString()));
}
else if (holesIncludingCenter.Count == 1)
{
INTPolygons isovistPolygon = holesIncludingCenter;
foreach (INTPolygon item in isovistPolygon)
{
if (Clipper.PointInPolygon(iCenter, item) == 1)
{
item.Reverse();
BarrierPolygon isovist = this.ConvertINTPolygonToBarrierPolygon(item);
results = null;
c = null;
clipperOffset = null;
offsetedPolygons = null;
holesNOT = null;
holesIncludingCenter = null;
isovistPolygon = null;
return(isovist);
}
}
MessageBox.Show(string.Format("Isovist not found!\nOne hole detected\n{0} polygons can be isovist", isovistPolygon.Count.ToString()));
}
else if (holesIncludingCenter.Count > 1)
{
MessageBox.Show("Isovist not found!\nMore than one hole found that can include the vantage point");
}
return(null);
}
/// <summary>
/// Simplifies an list INTPolygons using expand and shrink technique.
/// </summary>
/// <param name="polygons">The INTPolygons.</param>
/// <param name="value">The value used for expand and shrink.</param>
/// <returns>INTPolygons.</returns>
public INTPolygons SimplifyINTPolygons(INTPolygons polygons, double value)
{
double simplificationFactor = Math.Pow(10.0, this.PolygonalBooleanPrecision) * UnitConversion.Convert(value, Length_Unit_Types.FEET, UnitType);
ClipperOffset clipperOffset = new ClipperOffset();
clipperOffset.AddPaths(polygons, ClipperLib.JoinType.jtMiter, EndType.etClosedPolygon);
INTPolygons shrink = new INTPolygons();
clipperOffset.Execute(ref shrink, -simplificationFactor);
//expanding to return the polygons to their original position
clipperOffset.Clear();
clipperOffset.AddPaths(shrink, ClipperLib.JoinType.jtMiter, EndType.etClosedPolygon);
INTPolygons expand = new INTPolygons();
clipperOffset.Execute(ref expand, simplificationFactor);
shrink = null;
clipperOffset = null;
return(expand);
}
