protected override void OnRender(DrawingContext drawingContext)
{
if (ParentMap != null)
{
var x1 = Padding.Left + StrokeThickness / 2d;
var x2 = size.Width - Padding.Right - StrokeThickness / 2d;
var y1 = size.Height / 2d;
var y2 = size.Height - Padding.Bottom - StrokeThickness / 2d;
var text = length >= 1000d ? string.Format("{0:0} km", length / 1000d) : string.Format("{0:0} m", length);
drawingContext.DrawRectangle(Background ?? ParentMap.Background, null, new Rect(size));
drawingContext.DrawLine(Pen, new Point(x1, y1), new Point(x1, y2));
drawingContext.DrawLine(Pen, new Point(x2, y1), new Point(x2, y2));
drawingContext.DrawLine(Pen, new Point(x1, y2), new Point(x2, y2));
drawingContext.DrawGlyphRun(Foreground,
GlyphRunText.Create(text, Typeface, FontSize, new Vector(size.Width / 2d, y1 - StrokeThickness - 1d)));
}
}
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();
}
}
}