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Reworked MapGraticule

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Clemens 2022-04-27 18:00:40 +02:00
parent 7c5eb04c9e
commit 53a291662d
3 changed files with 399 additions and 432 deletions
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324
MapControl/WPF/MapGraticule.WPF.cs
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@ -2,7 +2,6 @@
// © 2022 Clemens Fischer
// Licensed under the Microsoft Public License (Ms-PL)
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
@ -13,25 +12,13 @@ namespace MapControl
{
public partial class MapGraticule
{
private const double LineInterpolationResolution = 2d;
private class Label
{
public readonly double Position;
public readonly FormattedText Text;
public Label(double position, FormattedText text)
{
Position = position;
Text = text;
}
}
static MapGraticule()
{
StrokeThicknessProperty.OverrideMetadata(typeof(MapGraticule), new FrameworkPropertyMetadata(0.5));
}
private readonly PathGeometry pathGeometry = new PathGeometry();
protected override void OnViewportChanged(ViewportChangedEventArgs e)
{
InvalidateVisual();
@ -43,289 +30,54 @@ namespace MapControl
if (projection != null)
{
var typeface = new Typeface(FontFamily, FontStyle, FontWeight, FontStretch);
var pixelsPerDip = VisualTreeHelper.GetDpi(this).PixelsPerDip;
var pathGeometry = new PathGeometry();
var labels = new List<Label>();
SetLineDistance();
if (projection.Type <= MapProjectionType.NormalCylindrical)
{
DrawCylindricalGraticule(drawingContext);
DrawCylindricalGraticule(pathGeometry.Figures, labels);
}
else
{
DrawGraticule(drawingContext);
DrawGraticule(pathGeometry.Figures, labels);
}
drawingContext.DrawGeometry(null, CreatePen(), pathGeometry);
foreach (var label in labels)
{
var latText = new FormattedText(label.LatitudeText,
CultureInfo.InvariantCulture, FlowDirection.LeftToRight, typeface, FontSize, Foreground, pixelsPerDip);
var lonText = new FormattedText(label.LongitudeText,
CultureInfo.InvariantCulture, FlowDirection.LeftToRight, typeface, FontSize, Foreground, pixelsPerDip);
var x = label.Position.X + StrokeThickness / 2d + 2d;
var y1 = label.Position.Y - StrokeThickness / 2d - latText.Height;
var y2 = label.Position.Y + StrokeThickness / 2d;
drawingContext.PushTransform(new RotateTransform(label.Rotation, label.Position.X, label.Position.Y));
drawingContext.DrawText(latText, new Point(x, y1));
drawingContext.DrawText(lonText, new Point(x, y2));
drawingContext.Pop();
}
}
}
private void DrawCylindricalGraticule(DrawingContext drawingContext)
private static PathFigure CreatePolylineFigure(ICollection<Point> points)
{
var path = new PathGeometry();
var typeface = new Typeface(FontFamily, FontStyle, FontWeight, FontStretch);
var pixelsPerDip = VisualTreeHelper.GetDpi(this).PixelsPerDip;
var lineDistance = GetLineDistance();
var labelFormat = GetLabelFormat(lineDistance);
var boundingBox = ParentMap.ViewRectToBoundingBox(new Rect(ParentMap.RenderSize));
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);
for (var lat = latLabelStart; lat <= boundingBox.North; lat += lineDistance)
var figure = new PathFigure
{
latLabels.Add(new Label(lat, new FormattedText(
GetLabelText(lat, labelFormat, "NS"),
CultureInfo.InvariantCulture, FlowDirection.LeftToRight, typeface, FontSize, Foreground, pixelsPerDip)));
StartPoint = points.First(),
IsFilled = false
};
var p1 = ParentMap.LocationToView(new Location(lat, boundingBox.West));
var p2 = ParentMap.LocationToView(new Location(lat, boundingBox.East));
if (MapProjection.IsValid(p1) && MapProjection.IsValid(p2))
{
var figure = new PathFigure { StartPoint = p1 };
figure.Segments.Add(new LineSegment(p2, true));
path.Figures.Add(figure);
}
}
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, pixelsPerDip)));
var p1 = ParentMap.LocationToView(new Location(boundingBox.South, lon));
var p2 = ParentMap.LocationToView(new Location(boundingBox.North, lon));
if (MapProjection.IsValid(p1) && MapProjection.IsValid(p2))
{
var figure = new PathFigure { StartPoint = p1 };
figure.Segments.Add(new LineSegment(p2, true));
path.Figures.Add(figure);
}
}
drawingContext.DrawGeometry(null, CreatePen(), path);
foreach (var latLabel in latLabels)
{
foreach (var lonLabel in lonLabels)
{
var position = ParentMap.LocationToView(new Location(latLabel.Position, lonLabel.Position));
if (MapProjection.IsValid(position))
{
DrawLabel(drawingContext, latLabel.Text, lonLabel.Text, position, ParentMap.ViewTransform.Rotation);
}
}
}
}
private void DrawGraticule(DrawingContext drawingContext)
{
var path = new PathGeometry();
var typeface = new Typeface(FontFamily, FontStyle, FontWeight, FontStretch);
var pixelsPerDip = VisualTreeHelper.GetDpi(this).PixelsPerDip;
var lineDistance = GetLineDistance();
var labelFormat = GetLabelFormat(lineDistance);
var minLat = 0d;
var maxLat = 0d;
GetLatitudeRange(lineDistance, ref minLat, ref maxLat);
var latSegments = (int)Math.Round(Math.Abs(maxLat - minLat) / lineDistance);
var interpolationCount = Math.Max(1, (int)Math.Ceiling(lineDistance / LineInterpolationResolution));
var interpolationDistance = lineDistance / interpolationCount;
var latPoints = latSegments * interpolationCount;
var centerLon = Math.Round(ParentMap.Center.Longitude / lineDistance) * lineDistance;
var westLimit = centerLon - 180d;
var eastLimit = centerLon + 180d;
if (ParentMap.MapProjection.Type == MapProjectionType.TransverseCylindrical)
{
westLimit = ParentMap.MapProjection.Center.Longitude - 15d;
eastLimit = ParentMap.MapProjection.Center.Longitude + 15d;
westLimit = Math.Floor(westLimit / lineDistance) * lineDistance;
eastLimit = Math.Ceiling(eastLimit / lineDistance) * lineDistance;
}
var minLon = centerLon - lineDistance;
var maxLon = centerLon + lineDistance;
if (DrawMeridian(path.Figures, centerLon, minLat, interpolationDistance, latPoints))
{
while (DrawMeridian(path.Figures, minLon, minLat, interpolationDistance, latPoints) &&
minLon > westLimit)
{
minLon -= lineDistance;
}
while (DrawMeridian(path.Figures, maxLon, minLat, interpolationDistance, latPoints) &&
maxLon < eastLimit)
{
maxLon += lineDistance;
}
}
var lonSegments = (int)Math.Round(Math.Abs(maxLon - minLon) / lineDistance);
for (var i = 1; i < latSegments; i++)
{
var lat = minLat + i * lineDistance;
var lon = minLon;
var location = new Location(lat, lon);
var points = new List<Point>();
var p = ParentMap.LocationToView(location);
if (MapProjection.IsValid(p))
{
points.Add(p);
DrawLabel(drawingContext, typeface, pixelsPerDip, p, location, labelFormat);
}
for (int j = 0; j < lonSegments; j++)
{
for (int k = 1; k <= interpolationCount; k++)
{
lon = minLon + j * lineDistance + k * interpolationDistance;
location = new Location(lat, lon);
p = ParentMap.LocationToView(location);
if (MapProjection.IsValid(p))
{
points.Add(p);
}
}
DrawLabel(drawingContext, typeface, pixelsPerDip, p, location, labelFormat);
}
if (points.Count >= 2)
{
var figure = new PathFigure { StartPoint = points.First() };
figure.Segments.Add(new PolyLineSegment(points.Skip(1), true));
path.Figures.Add(figure);
}
}
drawingContext.DrawGeometry(null, CreatePen(), path);
}
private bool DrawMeridian(PathFigureCollection figures,
double longitude, double startLatitude, double deltaLatitude, int numPoints)
{
var points = new List<Point>();
var visible = false;
for (int i = 0; i <= numPoints; i++)
{
var p = ParentMap.LocationToView(new Location(startLatitude + i * deltaLatitude, longitude));
if (MapProjection.IsValid(p))
{
visible = visible ||
p.X >= 0d && p.X <= ParentMap.RenderSize.Width &&
p.Y >= 0d && p.Y <= ParentMap.RenderSize.Height;
points.Add(p);
}
}
if (points.Count >= 2)
{
var figure = new PathFigure { StartPoint = points.First() };
figure.Segments.Add(new PolyLineSegment(points.Skip(1), true));
figures.Add(figure);
}
return visible;
}
private void DrawLabel(DrawingContext drawingContext, Typeface typeface, double pixelsPerDip,
Point position, Location location, string labelFormat)
{
if (position.X >= 0d && position.X <= ParentMap.RenderSize.Width &&
position.Y >= 0d && position.Y <= ParentMap.RenderSize.Height)
{
var latText = new FormattedText(GetLabelText(location.Latitude, labelFormat, "NS"),
CultureInfo.InvariantCulture, FlowDirection.LeftToRight, typeface, FontSize, Foreground, pixelsPerDip);
var lonText = new FormattedText(GetLabelText(location.Longitude, labelFormat, "EW"),
CultureInfo.InvariantCulture, FlowDirection.LeftToRight, typeface, FontSize, Foreground, pixelsPerDip);
location.Longitude += latText.Width / PixelPerLongitudeDegree(location);
var p = ParentMap.LocationToView(location);
if (MapProjection.IsValid(p))
{
DrawLabel(drawingContext, latText, lonText, position, Vector.AngleBetween(new Vector(1d, 0d), p - position));
}
}
}
private void DrawLabel(DrawingContext drawingContext,
FormattedText latitudeLabel, FormattedText longitudeLabel, Point position, double rotation)
{
var x = position.X + StrokeThickness / 2d + 2d;
var y1 = position.Y - StrokeThickness / 2d - latitudeLabel.Height;
var y2 = position.Y + StrokeThickness / 2d;
drawingContext.PushTransform(new RotateTransform(rotation, position.X, position.Y));
drawingContext.DrawText(latitudeLabel, new Point(x, y1));
drawingContext.DrawText(longitudeLabel, new Point(x, y2));
drawingContext.Pop();
}
private void GetLatitudeRange(double lineDistance, ref double minLatitude, ref double maxLatitude)
{
var width = ParentMap.RenderSize.Width;
var height = ParentMap.RenderSize.Height;
var northPole = ParentMap.LocationToView(new Location(90d, 0d));
var southPole = ParentMap.LocationToView(new Location(-90d, 0d));
if (northPole.X >= 0d && northPole.Y >= 0d && northPole.X <= width && northPole.Y <= height)
{
maxLatitude = 90d;
}
if (southPole.X >= 0d && southPole.Y >= 0d && southPole.X <= width && southPole.Y <= height)
{
minLatitude = -90d;
}
if (minLatitude > -90d || maxLatitude < 90d)
{
var locations = new Location[]
{
ParentMap.ViewToLocation(new Point(0d, 0d)),
ParentMap.ViewToLocation(new Point(width / 2d, 0d)),
ParentMap.ViewToLocation(new Point(width, 0d)),
ParentMap.ViewToLocation(new Point(width, height / 2d)),
ParentMap.ViewToLocation(new Point(width, height)),
ParentMap.ViewToLocation(new Point(width / 2d, height)),
ParentMap.ViewToLocation(new Point(0d, height)),
ParentMap.ViewToLocation(new Point(0d, height / 2)),
};
var latitudes = locations.Where(loc => loc != null).Select(loc => loc.Latitude);
var south = -90d;
var north = 90d;
if (latitudes.Distinct().Count() >= 2)
{
south = latitudes.Min();
north = latitudes.Max();
}
if (minLatitude > -90d)
{
minLatitude = Math.Max(Math.Floor(south / lineDistance) * lineDistance, -90d);
}
if (maxLatitude < 90d)
{
maxLatitude = Math.Min(Math.Ceiling(north / lineDistance) * lineDistance, 90d);
}
}
figure.Segments.Add(new PolyLineSegment(points.Skip(1), true));
return figure;
}
}
}