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Updated projection center update behavior

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ClemensFischer 2026-01-20 22:21:26 +01:00
parent 94e8edf18b
commit c245a8f722
6 changed files with 38 additions and 11 deletions
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34
MapControl/Shared/MapProjection.cs
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@ -25,7 +25,7 @@ namespace MapControl
#else
[System.ComponentModel.TypeConverter(typeof(MapProjectionConverter))]
#endif
public abstract class MapProjection
public abstract class MapProjection(bool hasCenter = false)
{
public const double Wgs84EquatorialRadius = 6378137d;
public const double Wgs84Flattening = 1d / 298.257223563;
@ -60,19 +60,41 @@ namespace MapControl
/// </summary>
public string CrsId { get; protected set; } = "";
private Location center;
private bool updateCenter = hasCenter;
/// <summary>
/// Gets or sets an optional projection center.
/// Gets or sets an optional projection center. If the property is set to a non-null value,
/// it overrides the projection center set by MapBase.Center or MapBase.ProjectionCenter.
/// </summary>
public Location Center
{
get => field ??= new Location();
protected internal set
get => center ??= new Location();
set
{
updateCenter = true;
if (value != null)
{
SetCenter(value);
updateCenter = false;
}
}
}
/// <summary>
/// Called by MapBase.UpdateTransform().
/// </summary>
internal void SetCenter(Location value)
{
if (updateCenter)
{
var latitude = value.Latitude;
var longitude = Location.NormalizeLongitude(value.Longitude);
if (field == null || !field.Equals(value.Latitude, longitude))
if (center == null || !center.Equals(latitude, longitude))
{
field = new Location(value.Latitude, longitude);
center = new Location(latitude, longitude);
CenterChanged();
}
}