ClemensFischer/XAML-Map-Control
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General map graticule for WPF

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This commit is contained in:
Clemens 2022-03-04 22:28:18 +01:00
parent c998f19fe5
commit a07948be02
11 changed files with 414 additions and 122 deletions
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2
MapControl/Shared/AzimuthalProjection.cs
View file

@ -31,7 +31,7 @@ namespace MapControl
var width = rect.Width / Wgs84MeterPerDegree;
var height = rect.Height / Wgs84MeterPerDegree;
return new CenteredBoundingBox(center, width, height);
return center != null ? new CenteredBoundingBox(center, width, height) : null;
}
/// <summary>

91
MapControl/Shared/MapBase.cs
View file

@ -279,7 +279,7 @@ namespace MapControl
public void SetTransformCenter(Point center)
{
transformCenter = ViewToLocation(center);
viewCenter = center;
viewCenter = transformCenter != null ? center : new Point(RenderSize.Width / 2d, RenderSize.Height / 2d);
}
/// <summary>
@ -304,7 +304,11 @@ namespace MapControl
if (translation.X != 0d || translation.Y != 0d)
{
Center = ViewToLocation(viewCenter - translation);
var center = ViewToLocation(viewCenter - translation);
if (center != null)
{
Center = center;
}
}
}
@ -317,8 +321,8 @@ namespace MapControl
{
if (rotation != 0d || scale != 1d)
{
transformCenter = ViewToLocation(center);
viewCenter = center + translation;
SetTransformCenter(center);
viewCenter += translation;
if (rotation != 0d)
{
@ -367,11 +371,16 @@ namespace MapControl
{
var rect = MapProjection.BoundingBoxToRect(boundingBox);
var center = new Point(rect.X + rect.Width / 2d, rect.Y + rect.Height / 2d);
var scale = Math.Min(RenderSize.Width / rect.Width, RenderSize.Height / rect.Height);
var targetCenter = MapProjection.MapToLocation(center);
TargetZoomLevel = ViewTransform.ScaleToZoomLevel(scale);
TargetCenter = MapProjection.MapToLocation(center);
TargetHeading = 0d;
if (targetCenter != null)
{
var scale = Math.Min(RenderSize.Width / rect.Width, RenderSize.Height / rect.Height);
TargetZoomLevel = ViewTransform.ScaleToZoomLevel(scale);
TargetCenter = targetCenter;
TargetHeading = 0d;
}
}
internal double ConstrainedLongitude(double longitude)
@ -700,46 +709,58 @@ namespace MapControl
private void UpdateTransform(bool resetTransformCenter = false, bool projectionChanged = false)
{
var viewScale = ViewTransform.ZoomLevelToScale(ZoomLevel);
var center = transformCenter ?? Center;
var projection = MapProjection;
projection.Center = ProjectionCenter ?? Center;
ViewTransform.SetTransform(projection.LocationToMap(center), viewCenter, viewScale, Heading);
var mapCenter = projection.LocationToMap(transformCenter ?? Center);
if (transformCenter != null)
if (MapProjection.IsValid(mapCenter))
{
center = ViewToLocation(new Point(RenderSize.Width / 2d, RenderSize.Height / 2d));
center.Longitude = Location.NormalizeLongitude(center.Longitude);
ViewTransform.SetTransform(mapCenter, viewCenter, viewScale, Heading);
if (center.Latitude < -projection.MaxLatitude || center.Latitude > projection.MaxLatitude)
if (transformCenter != null)
{
center.Latitude = Math.Min(Math.Max(center.Latitude, -projection.MaxLatitude), projection.MaxLatitude);
resetTransformCenter = true;
var center = ViewToLocation(new Point(RenderSize.Width / 2d, RenderSize.Height / 2d));
if (center != null)
{
center.Longitude = Location.NormalizeLongitude(center.Longitude);
if (center.Latitude < -projection.MaxLatitude || center.Latitude > projection.MaxLatitude)
{
center.Latitude = Math.Min(Math.Max(center.Latitude, -projection.MaxLatitude), projection.MaxLatitude);
resetTransformCenter = true;
}
SetValueInternal(CenterProperty, center);
if (centerAnimation == null)
{
SetValueInternal(TargetCenterProperty, center);
}
if (resetTransformCenter)
{
ResetTransformCenter();
projection.Center = ProjectionCenter ?? center;
mapCenter = projection.LocationToMap(center);
if (MapProjection.IsValid(mapCenter))
{
ViewTransform.SetTransform(mapCenter, viewCenter, viewScale, Heading);
}
}
}
}
SetValueInternal(CenterProperty, center);
SetViewScale(ViewTransform.Scale);
if (centerAnimation == null)
{
SetValueInternal(TargetCenterProperty, center);
}
OnViewportChanged(new ViewportChangedEventArgs(projectionChanged, Center.Longitude - centerLongitude));
if (resetTransformCenter)
{
ResetTransformCenter();
projection.Center = ProjectionCenter ?? center;
ViewTransform.SetTransform(projection.LocationToMap(center), viewCenter, viewScale, Heading);
}
centerLongitude = Center.Longitude;
}
SetViewScale(ViewTransform.Scale);
OnViewportChanged(new ViewportChangedEventArgs(projectionChanged, Center.Longitude - centerLongitude));
centerLongitude = Center.Longitude;
}
protected override void OnViewportChanged(ViewportChangedEventArgs e)

23
MapControl/Shared/MapGraticule.cs
View file

@ -33,15 +33,9 @@ namespace MapControl
private double GetLineDistance()
{
var pixelPerDegree = ParentMap.ViewTransform.Scale * MapProjection.Wgs84MeterPerDegree;
var minDistance = MinLineDistance / pixelPerDegree;
var scale = 1d;
if (minDistance < 1d)
{
scale = minDistance < 1d / 60d ? 3600d : 60d;
minDistance *= scale;
}
var minDistance = MinLineDistance / PixelPerLongitudeDegree(ParentMap.Center);
var scale = minDistance < 1d / 60d ? 3600d : minDistance < 1d ? 60d : 1d;
minDistance *= scale;
var lineDistances = new double[] { 1d, 2d, 5d, 10d, 15d, 30d, 60d };
var i = 0;
@ -51,7 +45,14 @@ namespace MapControl
i++;
}
return lineDistances[i] / scale;
return Math.Min(lineDistances[i] / scale, 30d);
}
private double PixelPerLongitudeDegree(Location location)
{
return Math.Max(1d, // a reasonable lower limit
ParentMap.GetScale(location).X *
Math.Cos(location.Latitude * Math.PI / 180d) * MapProjection.Wgs84MeterPerDegree);
}
private static string GetLabelFormat(double lineDistance)
@ -64,6 +65,8 @@ namespace MapControl
{
var hemisphere = hemispheres[0];
value = (value + 540d) % 360d - 180d;
if (value < -1e-8) // ~1mm
{
value = -value;

8
MapControl/Shared/MapPanel.cs
View file

@ -147,9 +147,11 @@ namespace MapControl
if (parentMap.MapProjection.IsNormalCylindrical && IsOutsideViewport(position))
{
var location = parentMap.MapProjection.MapToLocation(center);
location.Longitude = parentMap.ConstrainedLongitude(location.Longitude);
position = parentMap.LocationToView(location);
if (location != null)
{
location.Longitude = parentMap.ConstrainedLongitude(location.Longitude);
position = parentMap.LocationToView(location);
}
}
var width = rect.Width * parentMap.ViewTransform.Scale;

26
MapControl/Shared/MapProjection.cs
View file

@ -64,6 +64,7 @@ namespace MapControl
/// <summary>
/// Transforms a Point in cartesian map coordinates to a Location in geographic coordinates.
/// Returns null when the Point can not be transformed.
/// </summary>
public abstract Location MapToLocation(Point point);
@ -79,13 +80,16 @@ namespace MapControl
/// <summary>
/// Transforms a Rect in cartesian map coordinates to a BoundingBox in geographic coordinates.
/// Returns null when the Rect can not be transformed.
/// </summary>
public virtual BoundingBox RectToBoundingBox(Rect rect)
{
var sw = MapToLocation(new Point(rect.X, rect.Y));
var ne = MapToLocation(new Point(rect.X + rect.Width, rect.Y + rect.Height));
return new BoundingBox(sw.Latitude, sw.Longitude, ne.Latitude, ne.Longitude);
return sw != null && ne != null
? new BoundingBox(sw.Latitude, sw.Longitude, ne.Latitude, ne.Longitude)
: null;
}
/// <summary>
@ -106,5 +110,25 @@ namespace MapControl
return string.Format(CultureInfo.InvariantCulture,
"{0},{1},{2},{3}", rect.X, rect.Y, (rect.X + rect.Width), (rect.Y + rect.Height));
}
/// <summary>
/// Checks if the X and Y values of a Point are neither NaN nor Infinity.
/// </summary>
public static bool IsValid(Point point)
{
return !double.IsNaN(point.X) && !double.IsInfinity(point.X) &&
!double.IsNaN(point.Y) && !double.IsInfinity(point.Y);
}
/// <summary>
/// Checks if the X, Y, Width and Height values of a Rect are neither NaN nor Infinity.
/// </summary>
public static bool IsValid(Rect rect)
{
return !double.IsNaN(rect.X) && !double.IsInfinity(rect.X) &&
!double.IsNaN(rect.Y) && !double.IsInfinity(rect.Y) &&
!double.IsNaN(rect.Width) && !double.IsInfinity(rect.Width) &&
!double.IsNaN(rect.Height) && !double.IsInfinity(rect.Height);
}
}
}

7
MapControl/Shared/OrthographicProjection.cs
View file

@ -33,6 +33,11 @@ namespace MapControl
var lat = location.Latitude * Math.PI / 180d;
var dLon = (location.Longitude - Center.Longitude) * Math.PI / 180d;
if (Math.Abs(lat - lat0) > Math.PI / 2d || Math.Abs(dLon) > Math.PI / 2d)
{
return new Point(double.NaN, double.NaN);
}
return new Point(
Wgs84EquatorialRadius * Math.Cos(lat) * Math.Sin(dLon),
Wgs84EquatorialRadius * (Math.Cos(lat0) * Math.Sin(lat) - Math.Sin(lat0) * Math.Cos(lat) * Math.Cos(dLon)));
@ -51,7 +56,7 @@ namespace MapControl
if (r2 > 1d)
{
return new Location(double.NaN, double.NaN);
return null;
}
var r = Math.Sqrt(r2);