protected override void OnRender(DrawingContext drawingContext)
{
if (ParentMap != null)
{
var bounds = ParentMap.ViewportTransform.Inverse.TransformBounds(new Rect(ParentMap.RenderSize));
var start = ParentMap.MapTransform.Transform(new Point(bounds.X, bounds.Y));
var end = ParentMap.MapTransform.Transform(new Point(bounds.X + bounds.Width, bounds.Y + bounds.Height));
var minSpacing = MinLineSpacing * 360d / (Math.Pow(2d, ParentMap.ZoomLevel) * TileSource.TileSize);
var spacing = LineSpacings[LineSpacings.Length - 1];
if (spacing >= minSpacing)
{
spacing = LineSpacings.FirstOrDefault(s => s >= minSpacing);
}
var latLabelStart = Math.Ceiling(start.Latitude / spacing) * spacing;
var lonLabelStart = Math.Ceiling(start.Longitude / spacing) * spacing;
var latLabels = new List <Label>((int)((end.Latitude - latLabelStart) / spacing) + 1);
var lonLabels = new List <Label>((int)((end.Longitude - lonLabelStart) / spacing) + 1);
var labelFormat = spacing < 1d ? "{0} {1}°{2:00}'" : "{0} {1}°";
for (var lat = latLabelStart; lat <= end.Latitude; lat += spacing)
{
latLabels.Add(new Label(lat, new FormattedText(
CoordinateString(lat, labelFormat, "NS"),
CultureInfo.InvariantCulture, FlowDirection.LeftToRight, Typeface, FontSize, Foreground)));
drawingContext.DrawLine(Pen,
ParentMap.LocationToViewportPoint(new Location(lat, start.Longitude)),
ParentMap.LocationToViewportPoint(new Location(lat, end.Longitude)));
}
for (var lon = lonLabelStart; lon <= end.Longitude; lon += spacing)
{
lonLabels.Add(new Label(lon, new FormattedText(
CoordinateString(Location.NormalizeLongitude(lon), labelFormat, "EW"),
CultureInfo.InvariantCulture, FlowDirection.LeftToRight, Typeface, FontSize, Foreground)));
drawingContext.DrawLine(Pen,
ParentMap.LocationToViewportPoint(new Location(start.Latitude, lon)),
ParentMap.LocationToViewportPoint(new Location(end.Latitude, lon)));
}
foreach (var latLabel in latLabels)
{
foreach (var lonLabel in lonLabels)
{
var position = ParentMap.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();
}
}
}
}
protected override void OnViewportChanged()
{
var bounds = ParentMap.ViewportTransform.Inverse.TransformBounds(new Rect(new Point(), ParentMap.RenderSize));
var start = ParentMap.MapTransform.Transform(new Point(bounds.X, bounds.Y));
var end = ParentMap.MapTransform.Transform(new Point(bounds.X + bounds.Width, bounds.Y + bounds.Height));
var minSpacing = MinLineSpacing * 360d / (Math.Pow(2d, ParentMap.ZoomLevel) * 256d);
var spacing = LineSpacings[LineSpacings.Length - 1];
if (spacing >= minSpacing)
{
spacing = LineSpacings.FirstOrDefault(s => s >= minSpacing);
}
var labelStart = new Location(
Math.Ceiling(start.Latitude / spacing) * spacing,
Math.Ceiling(start.Longitude / spacing) * spacing);
var labelEnd = new Location(
Math.Floor(end.Latitude / spacing) * spacing,
Math.Floor(end.Longitude / spacing) * spacing);
var lineStart = new Location(
Math.Min(Math.Max(labelStart.Latitude - spacing, -ParentMap.MapTransform.MaxLatitude), ParentMap.MapTransform.MaxLatitude),
labelStart.Longitude - spacing);
var lineEnd = new Location(
Math.Min(Math.Max(labelEnd.Latitude + spacing, -ParentMap.MapTransform.MaxLatitude), ParentMap.MapTransform.MaxLatitude),
labelEnd.Longitude + spacing);
if (!lineStart.Equals(graticuleStart) || !lineEnd.Equals(graticuleEnd))
{
graticuleStart = lineStart;
graticuleEnd = lineEnd;
var geometry = (PathGeometry)path.Data;
geometry.Figures.Clear();
geometry.Transform = ParentMap.ViewportTransform;
for (var lat = labelStart.Latitude; lat <= end.Latitude; lat += spacing)
{
var figure = new PathFigure
{
StartPoint = ParentMap.MapTransform.Transform(new Location(lat, lineStart.Longitude)),
IsClosed = false,
IsFilled = false
};
figure.Segments.Add(new LineSegment
{
Point = ParentMap.MapTransform.Transform(new Location(lat, lineEnd.Longitude)),
});
geometry.Figures.Add(figure);
}
for (var lon = labelStart.Longitude; lon <= end.Longitude; lon += spacing)
{
var figure = new PathFigure
{
StartPoint = ParentMap.MapTransform.Transform(new Location(lineStart.Latitude, lon)),
IsClosed = false,
IsFilled = false
};
figure.Segments.Add(new LineSegment
{
Point = ParentMap.MapTransform.Transform(new Location(lineEnd.Latitude, lon)),
});
geometry.Figures.Add(figure);
}
var childIndex = 1; // 0 for Path
var format = spacing < 1d ? "{0} {1}°{2:00}'" : "{0} {1}°";
for (var lat = labelStart.Latitude; lat <= end.Latitude; lat += spacing)
{
for (var lon = labelStart.Longitude; lon <= end.Longitude; lon += spacing)
{
TextBlock label;
if (childIndex < Children.Count)
{
label = (TextBlock)Children[childIndex];
}
else
{
var renderTransform = new TransformGroup();
renderTransform.Children.Add(new TranslateTransform());
renderTransform.Children.Add(ParentMap.RotateTransform);
renderTransform.Children.Add(new TranslateTransform());
label = new TextBlock
{
RenderTransform = renderTransform
};
label.SetBinding(TextBlock.ForegroundProperty, new Binding
{
Source = this,
Path = new PropertyPath("Foreground")
});
Children.Add(label);
}
childIndex++;
if (FontFamily != null)
{
label.FontFamily = FontFamily;
}
label.FontSize = FontSize;
label.FontStyle = FontStyle;
label.FontStretch = FontStretch;
label.FontWeight = FontWeight;
label.Text = string.Format("{0}\n{1}", CoordinateString(lat, format, "NS"), CoordinateString(Location.NormalizeLongitude(lon), format, "EW"));
label.Tag = new Location(lat, lon);
label.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
var translateTransform = (TranslateTransform)((TransformGroup)label.RenderTransform).Children[0];
translateTransform.X = StrokeThickness / 2d + 2d;
translateTransform.Y = -label.DesiredSize.Height / 2d;
}
}
while (Children.Count > childIndex)
{
Children.RemoveAt(Children.Count - 1);
}
}
// don't use MapPanel.Location because labels may be at more than 180° distance from map center
for (int i = 1; i < Children.Count; i++)
{
var label = (TextBlock)Children[i];
var location = (Location)label.Tag;
var viewportTransform = (TranslateTransform)((TransformGroup)label.RenderTransform).Children[2];
var viewportPosition = ParentMap.LocationToViewportPoint(location);
viewportTransform.X = viewportPosition.X;
viewportTransform.Y = viewportPosition.Y;
}
base.OnViewportChanged();
}
protected override void OnRender(DrawingContext drawingContext)
{
if (ParentMap != null)
{
var bounds = ParentMap.ViewportTransform.Inverse.TransformBounds(new Rect(ParentMap.RenderSize));
var start = ParentMap.MapTransform.Transform(new Point(bounds.X, bounds.Y));
var end = ParentMap.MapTransform.Transform(new Point(bounds.X + bounds.Width, bounds.Y + bounds.Height));
var minSpacing = MinLineSpacing * 360d / (Math.Pow(2d, ParentMap.ZoomLevel) * TileSource.TileSize);
var spacing = LineSpacings[LineSpacings.Length - 1];
if (spacing >= minSpacing)
{
spacing = LineSpacings.FirstOrDefault(s => s >= minSpacing);
}
var labelFormat = spacing < 1d ? "{0} {1}°{2:00}'" : "{0} {1}°";
var labelStart = new Location(
Math.Ceiling(start.Latitude / spacing) * spacing,
Math.Ceiling(start.Longitude / spacing) * spacing);
var latLabels = new List <Label>((int)((end.Latitude - labelStart.Latitude) / spacing) + 1);
var lonLabels = new List <Label>((int)((end.Longitude - labelStart.Longitude) / spacing) + 1);
for (var lat = labelStart.Latitude; lat <= end.Latitude; lat += spacing)
{
latLabels.Add(new Label(lat, CoordinateString(lat, labelFormat, "NS")));
drawingContext.DrawLine(Pen,
ParentMap.LocationToViewportPoint(new Location(lat, start.Longitude)),
ParentMap.LocationToViewportPoint(new Location(lat, end.Longitude)));
}
for (var lon = labelStart.Longitude; lon <= end.Longitude; lon += spacing)
{
lonLabels.Add(new Label(lon, CoordinateString(Location.NormalizeLongitude(lon), labelFormat, "EW")));
drawingContext.DrawLine(Pen,
ParentMap.LocationToViewportPoint(new Location(start.Latitude, lon)),
ParentMap.LocationToViewportPoint(new Location(end.Latitude, lon)));
}
if (Foreground != null && Foreground != Brushes.Transparent && latLabels.Count > 0 && lonLabels.Count > 0)
{
var latLabelOrigin = new Point(StrokeThickness / 2d + 2d, -StrokeThickness / 2d - FontSize / 4d);
var lonLabelOrigin = new Point(StrokeThickness / 2d + 2d, StrokeThickness / 2d + FontSize);
var transform = Matrix.Identity;
transform.Rotate(ParentMap.Heading);
foreach (var latLabel in latLabels)
{
foreach (var lonLabel in lonLabels)
{
GlyphRun latGlyphRun;
GlyphRun lonGlyphRun;
if (!glyphRuns.TryGetValue(latLabel.Text, out latGlyphRun))
{
latGlyphRun = GlyphRunText.Create(latLabel.Text, Typeface, FontSize, latLabelOrigin);
glyphRuns.Add(latLabel.Text, latGlyphRun);
}
if (!glyphRuns.TryGetValue(lonLabel.Text, out lonGlyphRun))
{
lonGlyphRun = GlyphRunText.Create(lonLabel.Text, Typeface, FontSize, lonLabelOrigin);
glyphRuns.Add(lonLabel.Text, lonGlyphRun);
}
var position = ParentMap.LocationToViewportPoint(new Location(latLabel.Position, lonLabel.Position));
drawingContext.PushTransform(new MatrixTransform(
transform.M11, transform.M12, transform.M21, transform.M22, position.X, position.Y));
drawingContext.DrawGlyphRun(Foreground, latGlyphRun);
drawingContext.DrawGlyphRun(Foreground, lonGlyphRun);
drawingContext.Pop();
}
}
var removeKeys = glyphRuns.Keys.Where(k => !latLabels.Any(l => l.Text == k) && !lonLabels.Any(l => l.Text == k));
foreach (var key in removeKeys.ToList())
{
glyphRuns.Remove(key);
}
}
else
{
glyphRuns.Clear();
}
}
}
