/// <summary>
/// Returns a geoJson map into a heat map.
/// </summary>
/// <param name="geoJson">The geoJson.</param>
/// <param name="values">The values.</param>
/// <param name="heatMap">The heat map.</param>
/// <param name="heatStops">The heat stops.</param>
/// <param name="stroke">The stroke.</param>
/// <param name="fill">The fill.</param>
/// <param name="thickness">The thickness.</param>
/// <param name="projector">The projector.</param>
/// <returns></returns>
public static IEnumerable<PathShape> AsHeatMapShapes(
this GeoJsonFile geoJson,
Dictionary<string, double> values,
LvcColor[] heatMap, List<Tuple<double, LvcColor>> heatStops,
LvcColor stroke,
LvcColor fill,
float thickness,
MapProjector projector)
{
var paths = new List<PathShape>();
var weightBounds = new Bounds();
foreach (var value in values)
{
weightBounds.AppendValue(value.Value);
}
var d = new double[0][][][];
foreach (var feature in geoJson.Features ?? new GeoJsonFeature[0])
{
var name = feature.Properties is not null ? feature.Properties["shortName"] : "";
LvcColor? baseColor = values.TryGetValue(name, out var weight)
? HeatFunctions.InterpolateColor((float)weight, weightBounds, heatMap, heatStops)
: null;
foreach (var geometry in feature.Geometry?.Coordinates ?? d)
{
foreach (var segment in geometry)
{
var path = new PathShape
{
StrokeColor = stroke,
FillColor = baseColor ?? fill,
StrokeThickness = thickness,
IsClosed = true
};
var isFirst = true;
foreach (var point in segment)
{
var p = projector.ToMap(point);
if (isFirst)
{
isFirst = false;
path.AddCommand(new MoveToPathCommand { X = p[0], Y = p[1] });
continue;
}
path.AddCommand(new LineSegment { X = p[0], Y = p[1] });
}
paths.Add(path);
}
}
}
return paths;
}
/// <summary>
/// Initializes a new instance of <see cref="MapContext{TDrawingContext}"/> class.
/// </summary>
public MapContext(
GeoMap <TDrawingContext> core,
IGeoMapView <TDrawingContext> view,
CoreMap <TDrawingContext> map,
MapProjector projector)
{
CoreMap = core;
MapFile = map;
Projector = projector;
View = view;
}