public Task PanTo(string id, LatLngLiteral latLng)
{
return(_jsRuntime.JsonNetInvokeAsync <bool>(
"googleMapJsFunctions.panTo",
id,
latLng));
}
public Task SetCenter(string id, LatLngLiteral latLng)
{
return(_jsRuntime.JsonNetInvokeAsync <bool>(
"googleMapJsFunctions.setCenter",
id,
latLng));
}
/// <summary>
/// Change the center of the map.
/// </summary>
/// <param name="TheCenter">Location of center</param>
/// <returns>A Task to wait on.</returns>
public async Task CenterMap(LatLngLiteral TheCenter)
{
Options.Center = TheCenter;
if (InteropObject != null)
{
await InteropObject.SetCenter(TheCenter);
}
}
public Task SetCenter(LatLngLiteral latLng)
{
return(JsRuntime.InvokeWithDefinedGuidAndMethodAsync <object>(
"googleMapJsFunctions.invoke",
DivId,
"setCenter",
latLng));
}
public static LatLngLiteral Compute2DPolygonCentroid(List <LatLngLiteral> vertices)
{
LatLngLiteral centroid = new LatLngLiteral()
{
Lat = 0.0, Lng = 0.0
};
double signedArea = 0.0;
double x0 = 0.0; // Current vertex X
double y0 = 0.0; // Current vertex Y
double x1 = 0.0; // Next vertex X
double y1 = 0.0; // Next vertex Y
double a = 0.0; // Partial signed area
//If no vertices, then return empty
if (vertices.Count == 0)
{
return(centroid);
}
// For all vertices except last
int i = 0;
for (i = 0; i < vertices.Count - 1; ++i)
{
x0 = vertices[i].Lat;
y0 = vertices[i].Lng;
x1 = vertices[i + 1].Lat;
y1 = vertices[i + 1].Lng;
a = x0 * y1 - x1 * y0;
signedArea += a;
centroid.Lat += (x0 + x1) * a;
centroid.Lng += (y0 + y1) * a;
}
// Do last vertex
x0 = vertices[i].Lat;
y0 = vertices[i].Lng;
x1 = vertices[0].Lat;
y1 = vertices[0].Lng;
a = x0 * y1 - x1 * y0;
signedArea += a;
centroid.Lat += (x0 + x1) * a;
centroid.Lng += (y0 + y1) * a;
signedArea *= 0.5F;
centroid.Lat /= (6 * signedArea);
centroid.Lng /= (6 * signedArea);
return(centroid);
}
private static int isLeft(LatLngLiteral P0, LatLngLiteral P1, LatLngLiteral P2)
{
double calc = ((P1.Lng - P0.Lng) * (P2.Lat - P0.Lat)
- (P2.Lng - P0.Lng) * (P1.Lat - P0.Lat));
if (calc > 0)
{
return(1);
}
else if (calc < 0)
{
return(-1);
}
else
{
return(0);
}
}
public static bool IsPointInPolygon(LatLngLiteral p, List <LatLngLiteral> poly)
{
int n = poly.Count();
poly.Add(new LatLngLiteral {
Lat = poly[0].Lat, Lng = poly[0].Lng
});
LatLngLiteral[] v = poly.ToArray();
int wn = 0; // the winding number counter
// loop through all edges of the polygon
for (int i = 0; i < n; i++)
{ // edge from V[i] to V[i+1]
if (v[i].Lat <= p.Lat)
{ // start y <= P.y
if (v[i + 1].Lat > p.Lat) // an upward crossing
{
if (isLeft(v[i], v[i + 1], p) > 0) // P left of edge
{
++wn; // have a valid up intersect
}
}
}
else
{ // start y > P.y (no test needed)
if (v[i + 1].Lat <= p.Lat) // a downward crossing
{
if (isLeft(v[i], v[i + 1], p) < 0) // P right of edge
{
--wn; // have a valid down intersect
}
}
}
}
if (wn != 0)
{
return(true);
}
else
{
return(false);
}
}
public async Task RenderMap(Graph <VertexInfo, EdgeInfo> graph)
{
await ClearMap();
// Add markers for each vertex
foreach (var vertex in graph.Vertices)
{
_markers.Add(await Marker.CreateAsync(_map.JsRuntime, new MarkerOptions()
{
Map = _map.InteropObject,
Position = new LatLngLiteral(vertex.Info.Position.Item2, vertex.Info.Position.Item1),
Clickable = false,
//Label = vertex.Info.Name,
Icon = new Icon()
{
Url = vertex.Info.Type switch
{
VertexType.Target => "icons/circle_green.svg",
VertexType.Base => "icons/home_black.svg",
VertexType.Both => "icons/home_green.svg",
},
public Point(LatLngLiteral latLng)
{
_latLng = latLng;
}
