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Fixed moving transform center across dateline.

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ClemensFischer 2022-11-24 23:24:51 +01:00
parent 7fbbf66acb
commit afc93704d9
7 changed files with 63 additions and 55 deletions
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13
MapControl/Shared/MapBase.cs
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@ -272,7 +272,8 @@ namespace MapControl
/// <summary>
/// Sets a temporary center point in view coordinates for scaling and rotation transformations.
/// This center point is automatically reset when the Center property is set by application code.
/// This center point is automatically reset when the Center property is set by application code
/// or by the methods TranslateMap, TransformMap, ZoomMap and ZoomToBounds.
/// </summary>
public void SetTransformCenter(Point center)
{
@ -728,6 +729,7 @@ namespace MapControl
private void UpdateTransform(bool resetTransformCenter = false, bool projectionChanged = false)
{
var transformCenterChanged = false;
var viewScale = ViewTransform.ZoomLevelToScale(ZoomLevel);
var projection = MapProjection;
@ -762,6 +764,9 @@ namespace MapControl
if (resetTransformCenter)
{
// check if transform center moved across the dateline
transformCenterChanged = Math.Abs(center.Longitude - transformCenter.Longitude) > 180d;
ResetTransformCenter();
projection.Center = ProjectionCenter ?? Center;
@ -778,9 +783,11 @@ namespace MapControl
SetViewScale(ViewTransform.Scale);
OnViewportChanged(new ViewportChangedEventArgs(projectionChanged, Center.Longitude - centerLongitude));
// check if view center moved across the dateline
transformCenterChanged = transformCenterChanged || Math.Abs(Center.Longitude - centerLongitude) > 180d;
centerLongitude = Center.Longitude;
OnViewportChanged(new ViewportChangedEventArgs(projectionChanged, transformCenterChanged));
}
}