ClemensFischer/XAML-Map-Control
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Version 4: Upgrade to VS 2017

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ClemensF 2017-08-04 21:38:58 +02:00
parent 2aafe32e00
commit ec47f225b3
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MapControl/WPF/MapGraticule.WPF.cs Normal file
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// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
// © 2017 Clemens Fischer
// Licensed under the Microsoft Public License (Ms-PL)
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Windows;
using System.Windows.Media;
namespace MapControl
{
public partial class MapGraticule
{
private class Label
{
public readonly double Position;
public readonly FormattedText Text;
public Label(double position, FormattedText text)
{
Position = position;
Text = text;
}
}
static MapGraticule()
{
IsHitTestVisibleProperty.OverrideMetadata(typeof(MapGraticule), new FrameworkPropertyMetadata(false));
StrokeThicknessProperty.OverrideMetadata(typeof(MapGraticule), new FrameworkPropertyMetadata(0.5));
}
protected override void OnViewportChanged(ViewportChangedEventArgs e)
{
InvalidateVisual();
}
protected override void OnRender(DrawingContext drawingContext)
{
var projection = ParentMap?.MapProjection;
if (projection != null && !double.IsNaN(projection.LongitudeScale))
{
var bounds = projection.ViewportRectToBoundingBox(new Rect(ParentMap.RenderSize));
var lineDistance = GetLineDistance();
var labelFormat = GetLabelFormat(lineDistance);
var latLabelStart = Math.Ceiling(bounds.South / lineDistance) * lineDistance;
var lonLabelStart = Math.Ceiling(bounds.West / lineDistance) * lineDistance;
var latLabels = new List<Label>((int)((bounds.North - latLabelStart) / lineDistance) + 1);
var lonLabels = new List<Label>((int)((bounds.East - lonLabelStart) / lineDistance) + 1);
for (var lat = latLabelStart; lat <= bounds.North; lat += lineDistance)
{
latLabels.Add(new Label(lat, new FormattedText(
GetLabelText(lat, labelFormat, "NS"),
CultureInfo.InvariantCulture, FlowDirection.LeftToRight, Typeface, FontSize, Foreground)));
drawingContext.DrawLine(Pen,
projection.LocationToViewportPoint(new Location(lat, bounds.West)),
projection.LocationToViewportPoint(new Location(lat, bounds.East)));
}
for (var lon = lonLabelStart; lon <= bounds.East; lon += lineDistance)
{
lonLabels.Add(new Label(lon, new FormattedText(
GetLabelText(Location.NormalizeLongitude(lon), labelFormat, "EW"),
CultureInfo.InvariantCulture, FlowDirection.LeftToRight, Typeface, FontSize, Foreground)));
drawingContext.DrawLine(Pen,
projection.LocationToViewportPoint(new Location(bounds.South, lon)),
projection.LocationToViewportPoint(new Location(bounds.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();
}
}
}
}
}
}