public bool SetBounds(MapProjection projection, Size viewportSize)
{
// bounds in tile pixels from viewport size
//
var bounds = projection.GetTileBounds(TileMatrix.Scale, TileMatrix.TopLeft, viewportSize);
// tile column and row index bounds
//
var xMin = (int)Math.Floor(bounds.X / TileMatrix.TileWidth);
var yMin = (int)Math.Floor(bounds.Y / TileMatrix.TileHeight);
var xMax = (int)Math.Floor((bounds.X + bounds.Width) / TileMatrix.TileWidth);
var yMax = (int)Math.Floor((bounds.Y + bounds.Height) / TileMatrix.TileHeight);
xMin = Math.Max(xMin, 0);
yMin = Math.Max(yMin, 0);
xMax = Math.Min(Math.Max(xMax, 0), TileMatrix.MatrixWidth - 1);
yMax = Math.Min(Math.Max(yMax, 0), TileMatrix.MatrixHeight - 1);
if (XMin == xMin && YMin == yMin && XMax == xMax && YMax == yMax)
{
return(false);
}
XMin = xMin;
YMin = yMin;
XMax = xMax;
YMax = yMax;
return(true);
}
/// <summary>
/// Changes the Center property according to the specified map translation in viewport coordinates.
/// </summary>
public void TranslateMap(Point translation)
{
if (transformCenter != null)
{
ResetTransformCenter();
UpdateTransform();
}
if (translation.X != 0d || translation.Y != 0d)
{
if (Heading != 0d)
{
var cos = Math.Cos(Heading / 180d * Math.PI);
var sin = Math.Sin(Heading / 180d * Math.PI);
translation = new Point(
translation.X * cos + translation.Y * sin,
translation.Y * cos - translation.X * sin);
}
translation.X = -translation.X;
translation.Y = -translation.Y;
Center = MapProjection.TranslateLocation(Center, translation);
}
}
private void TargetCenterPropertyChanged(Location targetCenter)
{
if (!internalPropertyChange)
{
AdjustCenterProperty(TargetCenterProperty, ref targetCenter);
if (!targetCenter.Equals(Center))
{
if (centerAnimation != null)
{
centerAnimation.Completed -= CenterAnimationCompleted;
}
// animate private CenterPoint property by PointAnimation
centerAnimation = new PointAnimation
{
From = MapProjection.LocationToPoint(Center),
To = MapProjection.LocationToPoint(new Location(
targetCenter.Latitude,
Location.NearestLongitude(targetCenter.Longitude, Center.Longitude))),
Duration = AnimationDuration,
EasingFunction = AnimationEasingFunction
};
centerAnimation.Completed += CenterAnimationCompleted;
this.BeginAnimation(CenterPointProperty, centerAnimation);
}
}
}
/// <summary>
/// Changes the Center, Heading and ZoomLevel properties according to the specified
/// viewport coordinate translation, rotation and scale delta values. Rotation and scaling
/// is performed relative to the specified center point in viewport coordinates.
/// </summary>
public void TransformMap(Point center, Vector translation, double rotation, double scale)
{
if (rotation != 0d || scale != 1d)
{
transformCenter = MapProjection.ViewportPointToLocation(center);
viewportCenter = center + translation;
if (rotation != 0d)
{
var heading = (((Heading + rotation) % 360d) + 360d) % 360d;
SetValueInternal(HeadingProperty, heading);
SetValueInternal(TargetHeadingProperty, heading);
}
if (scale != 1d)
{
var zoomLevel = Math.Min(Math.Max(ZoomLevel + Math.Log(scale, 2d), MinZoomLevel), MaxZoomLevel);
SetValueInternal(ZoomLevelProperty, zoomLevel);
SetValueInternal(TargetZoomLevelProperty, zoomLevel);
}
UpdateTransform(true);
}
else
{
TranslateMap(translation); // more precise
}
}
public void SetRenderTransform(MapProjection projection)
{
// tile grid origin in pixels
//
var tileGridOrigin = new Point(TileMatrix.TileWidth * XMin, TileMatrix.TileHeight * YMin);
((MatrixTransform)RenderTransform).Matrix =
projection.CreateTileLayerTransform(TileMatrix.Scale, TileMatrix.TopLeft, tileGridOrigin);
}
/// <summary>
/// Sets the TargetZoomLevel and TargetCenter properties so that the specified bounding box
/// fits into the current view. The TargetHeading property is set to zero.
/// </summary>
public void ZoomToBounds(BoundingBox boundingBox)
{
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);
TargetZoomLevel = ViewTransform.ScaleToZoomLevel(scale);
TargetCenter = MapProjection.MapToLocation(center);
TargetHeading = 0d;
}
private void CenterPointPropertyChanged(Point centerPoint)
{
if (!internalPropertyChange)
{
var center = MapProjection.PointToLocation(centerPoint);
center.Longitude = Location.NormalizeLongitude(center.Longitude);
InternalSetValue(CenterProperty, center);
UpdateTransform();
}
}
/// <summary>
/// Sets the TargetZoomLevel and TargetCenter properties so that the specified bounding box
/// fits into the current viewport. The TargetHeading property is set to zero.
/// </summary>
public void ZoomToBounds(BoundingBox boundingBox)
{
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)
* MapProjection.TrueScale / MapProjection.PixelPerDegree;
TargetZoomLevel = Math.Log(scale, 2d);
TargetCenter = MapProjection.PointToLocation(center);
TargetHeading = 0d;
}
private void CenterAnimationCompleted(object sender, object e)
{
if (centerAnimation != null)
{
centerAnimation.Completed -= CenterAnimationCompleted;
centerAnimation = null;
InternalSetValue(CenterProperty, TargetCenter);
InternalSetValue(CenterPointProperty, MapProjection.LocationToPoint(TargetCenter));
UpdateTransform();
}
}
private void DrawCylindricalGraticule(DrawingContext drawingContext, MapProjection projection, double lineDistance, string labelFormat)
{
var boundingBox = projection.ViewportRectToBoundingBox(new Rect(ParentMap.RenderSize));
if (boundingBox.HasValidBounds)
{
var latLabelStart = Math.Ceiling(boundingBox.South / lineDistance) * lineDistance;
var lonLabelStart = Math.Ceiling(boundingBox.West / lineDistance) * lineDistance;
var latLabels = new List <Label>((int)((boundingBox.North - latLabelStart) / lineDistance) + 1);
var lonLabels = new List <Label>((int)((boundingBox.East - lonLabelStart) / lineDistance) + 1);
var typeface = new Typeface(FontFamily, FontStyle, FontWeight, FontStretch);
var pixelsPerDpi = VisualTreeHelper.GetDpi(this).PixelsPerDip;
var pen = CreatePen();
for (var lat = latLabelStart; lat <= boundingBox.North; lat += lineDistance)
{
latLabels.Add(new Label(lat, new FormattedText(
GetLabelText(lat, labelFormat, "NS"),
CultureInfo.InvariantCulture, FlowDirection.LeftToRight, typeface, FontSize, Foreground, pixelsPerDpi)));
drawingContext.DrawLine(pen,
projection.LocationToViewportPoint(new Location(lat, boundingBox.West)),
projection.LocationToViewportPoint(new Location(lat, boundingBox.East)));
}
for (var lon = lonLabelStart; lon <= boundingBox.East; lon += lineDistance)
{
lonLabels.Add(new Label(lon, new FormattedText(
GetLabelText(Location.NormalizeLongitude(lon), labelFormat, "EW"),
CultureInfo.InvariantCulture, FlowDirection.LeftToRight, typeface, FontSize, Foreground, pixelsPerDpi)));
drawingContext.DrawLine(pen,
projection.LocationToViewportPoint(new Location(boundingBox.South, lon)),
projection.LocationToViewportPoint(new Location(boundingBox.North, lon)));
}
foreach (var latLabel in latLabels)
{
foreach (var lonLabel in lonLabels)
{
var position = projection.LocationToViewportPoint(new Location(latLabel.Position, lonLabel.Position));
drawingContext.PushTransform(new RotateTransform(ParentMap.Heading, position.X, position.Y));
drawingContext.DrawText(latLabel.Text,
new Point(position.X + StrokeThickness / 2d + 2d, position.Y - StrokeThickness / 2d - latLabel.Text.Height));
drawingContext.DrawText(lonLabel.Text,
new Point(position.X + StrokeThickness / 2d + 2d, position.Y + StrokeThickness / 2d));
drawingContext.Pop();
}
}
}
}
private void SetRenderTransform()
{
var tileScale = (double)(1 << TileGrid.ZoomLevel);
var scale = Math.Pow(2d, parentMap.ZoomLevel) / tileScale;
var tileCenter = new Point(tileScale * (0.5 + parentMap.Center.Longitude / 360d),
tileScale * (0.5 - WebMercatorProjection.LatitudeToY(parentMap.Center.Latitude) / 360d));
var tileOrigin = new Point(MapProjection.TileSize * (tileCenter.X - TileGrid.XMin),
MapProjection.TileSize * (tileCenter.Y - TileGrid.YMin));
var viewCenter = new Point(parentMap.RenderSize.Width / 2d, parentMap.RenderSize.Height / 2d);
((MatrixTransform)RenderTransform).Matrix =
MapProjection.CreateTransformMatrix(tileOrigin, scale, parentMap.Heading, viewCenter);
}
/// <summary>
/// Changes the Center property according to the specified translation in viewport coordinates.
/// </summary>
public void TranslateMap(Vector translation)
{
if (transformCenter != null)
{
ResetTransformCenter();
UpdateTransform();
}
if (translation.X != 0d || translation.Y != 0d)
{
Center = MapProjection.ViewportPointToLocation(viewportCenter - translation);
}
}
private void CenterPropertyChanged(Location center)
{
if (!internalPropertyChange)
{
AdjustCenterProperty(CenterProperty, ref center);
UpdateTransform();
if (centerAnimation == null)
{
InternalSetValue(TargetCenterProperty, center);
InternalSetValue(CenterPointProperty, MapProjection.LocationToPoint(center));
}
}
}
/// <summary>
/// Transforms a Rect in view coordinates to a BoundingBox in geographic coordinates.
/// </summary>
public BoundingBox ViewRectToBoundingBox(Rect rect)
{
var p1 = ViewTransform.ViewToMap(new Point(rect.X, rect.Y));
var p2 = ViewTransform.ViewToMap(new Point(rect.X, rect.Y + rect.Height));
var p3 = ViewTransform.ViewToMap(new Point(rect.X + rect.Width, rect.Y));
var p4 = ViewTransform.ViewToMap(new Point(rect.X + rect.Width, rect.Y + rect.Height));
rect.X = Math.Min(p1.X, Math.Min(p2.X, Math.Min(p3.X, p4.X)));
rect.Y = Math.Min(p1.Y, Math.Min(p2.Y, Math.Min(p3.Y, p4.Y)));
rect.Width = Math.Max(p1.X, Math.Max(p2.X, Math.Max(p3.X, p4.X))) - rect.X;
rect.Height = Math.Max(p1.Y, Math.Max(p2.Y, Math.Max(p3.Y, p4.Y))) - rect.Y;
return(MapProjection.RectToBoundingBox(rect));
}
/// <summary>
/// Sets the TargetZoomLevel and TargetCenter properties so that the specified bounding box
/// fits into the current viewport. The TargetHeading property is set to zero.
/// </summary>
public void ZoomToBounds(BoundingBox boundingBox)
{
if (boundingBox != null && boundingBox.HasValidBounds)
{
var rect = MapProjection.BoundingBoxToRect(boundingBox);
var center = new Point(rect.X + rect.Width / 2d, rect.Y + rect.Height / 2d);
var scale0 = 1d / MapProjection.GetViewportScale(0d);
var lonScale = scale0 * RenderSize.Width / rect.Width;
var latScale = scale0 * RenderSize.Height / rect.Height;
var lonZoom = Math.Log(lonScale, 2d);
var latZoom = Math.Log(latScale, 2d);
TargetZoomLevel = Math.Min(lonZoom, latZoom);
TargetCenter = MapProjection.PointToLocation(center);
TargetHeading = 0d;
}
}
private ImageSource GetImage(MapProjection projection, IEnumerable <IMapDrawingItem> items)
{
var scale = ParentMap.ViewTransform.Scale;
var rotation = ParentMap.ViewTransform.Rotation;
var mapRect = projection.BoundingBoxToRect(BoundingBox);
var imageRect = new Rect(0, 0, scale * mapRect.Width, scale * mapRect.Height);
var drawings = new DrawingGroup();
foreach (var item in items)
{
var positions = item.Locations.Select(l => projection.LocationToMap(l)).ToList();
if (positions.Any(p => mapRect.Contains(p)))
{
for (int i = 0; i < positions.Count; i++)
{
positions[i] = new Point(scale * (positions[i].X - mapRect.X),
imageRect.Height - scale * (positions[i].Y - mapRect.Y));
}
drawings.Children.Add(item.GetDrawing(positions, scale, rotation));
}
}
var drawingBrush = new DrawingBrush
{
Drawing = drawings,
ViewboxUnits = BrushMappingMode.Absolute,
Viewbox = imageRect,
};
var drawing = new GeometryDrawing
{
Geometry = new RectangleGeometry(imageRect),
Brush = drawingBrush
};
var image = new DrawingImage(drawing);
image.Freeze();
return(image);
}
private TileGrid GetTileGrid()
{
var tileZoomLevel = Math.Max(0, (int)Math.Round(parentMap.ZoomLevel + ZoomLevelOffset));
var tileScale = (double)(1 << tileZoomLevel);
var scale = tileScale / (Math.Pow(2d, parentMap.ZoomLevel) * MapProjection.TileSize);
var tileCenter = new Point(tileScale * (0.5 + parentMap.Center.Longitude / 360d),
tileScale * (0.5 - WebMercatorProjection.LatitudeToY(parentMap.Center.Latitude) / 360d));
var viewCenter = new Point(parentMap.RenderSize.Width / 2d, parentMap.RenderSize.Height / 2d);
var transform = new MatrixTransform
{
Matrix = MapProjection.CreateTransformMatrix(viewCenter, scale, -parentMap.Heading, tileCenter)
};
var bounds = transform.TransformBounds(new Rect(0d, 0d, parentMap.RenderSize.Width, parentMap.RenderSize.Height));
return(new TileGrid(tileZoomLevel,
(int)Math.Floor(bounds.X), (int)Math.Floor(bounds.Y),
(int)Math.Floor(bounds.X + bounds.Width), (int)Math.Floor(bounds.Y + bounds.Height)));
}
private double GetLineDistance()
{
var minDistance = MinLineDistance / MapProjection.DegreesToViewportScale(ParentMap.ZoomLevel);
var scale = 1d;
if (minDistance < 1d)
{
scale = minDistance < 1d / 60d ? 3600d : 60d;
minDistance *= scale;
}
var lineDistances = new double[] { 1d, 2d, 5d, 10d, 15d, 30d, 60d };
var i = 0;
while (i < lineDistances.Length - 1 && lineDistances[i] < minDistance)
{
i++;
}
return(lineDistances[i] / scale);
}
/// <summary>
/// Sets a temporary center point in viewport coordinates for scaling and rotation transformations.
/// This center point is automatically reset when the Center property is set by application code.
/// </summary>
public void SetTransformCenter(Point center)
{
transformCenter = MapProjection.ViewportPointToLocation(center);
viewportCenter = center;
}
/// <summary>
/// Transforms a Point in viewport coordinates to a Location in geographic coordinates.
/// </summary>
public Location ViewportPointToLocation(Point point)
{
return(MapProjection.ViewportPointToLocation(point));
}
/// <summary>
/// Transforms a Location in geographic coordinates to a Point in viewport coordinates.
/// </summary>
public Point LocationToViewportPoint(Location location)
{
return(MapProjection.LocationToViewportPoint(location));
}
/// <summary>
/// Transforms a Location in geographic coordinates to a Point in view coordinates.
/// </summary>
public Point LocationToView(Location location)
{
return(ViewTransform.MapToView(MapProjection.LocationToMap(location)));
}
/// <summary>
/// Transforms a Point in view coordinates to a Location in geographic coordinates.
/// </summary>
public Location ViewToLocation(Point point)
{
return(MapProjection.MapToLocation(ViewTransform.ViewToMap(point)));
}
protected virtual string GetBboxParam(MapProjection projection, Rect mapRect)
{
return("BBOX=" + projection.GetBboxValue(mapRect));
}
protected virtual string GetCrsParam(MapProjection projection)
{
return("CRS=" + projection.GetCrsValue());
}
/// <summary>
/// Gets the horizontal and vertical scaling factors from cartesian map coordinates to view
/// coordinates at the specified location, i.e. pixels per meter.
/// </summary>
public Vector GetScale(Location location)
{
var projectionScale = MapProjection.GetRelativeScale(location);
return(ViewTransform.Scale * projectionScale);
}
/// <summary>
/// Gets the horizontal and vertical scaling factors from cartesian map coordinates to view
/// coordinates at the specified location, i.e. pixels per meter.
/// </summary>
public Vector GetScale(Location location)
{
return(ViewTransform.Scale * MapProjection.GetRelativeScale(location));
}