Added MetricGrid

MapControl/WPF/MapGrid.WPF.cs

@@ -0,0 +1,100 @@
+using System.Collections.Generic;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Documents;
+using System.Windows.Media;
+
+namespace MapControl
+{
+    public partial class MapGrid : FrameworkElement, IMapElement
+    {
+        public static readonly DependencyProperty ForegroundProperty =
+            DependencyPropertyHelper.AddOwner<MapGrid, Brush>(TextElement.ForegroundProperty);
+
+        public static readonly DependencyProperty FontFamilyProperty =
+            DependencyPropertyHelper.AddOwner<MapGrid, FontFamily>(TextElement.FontFamilyProperty);
+
+        public static readonly DependencyProperty FontSizeProperty =
+            DependencyPropertyHelper.AddOwner<MapGrid, double>(TextElement.FontSizeProperty, 12d);
+
+        /// <summary>
+        /// Implements IMapElement.ParentMap.
+        /// </summary>
+        public MapBase ParentMap
+        {
+            get;
+            set
+            {
+                if (field != null)
+                {
+                    field.ViewportChanged -= OnViewportChanged;
+                }
+
+                field = value;
+
+                if (field != null)
+                {
+                    field.ViewportChanged += OnViewportChanged;
+                }
+            }
+        }
+
+        private void OnViewportChanged(object sender, ViewportChangedEventArgs e)
+        {
+            OnViewportChanged(e);
+        }
+
+        protected virtual void OnViewportChanged(ViewportChangedEventArgs e)
+        {
+            InvalidateVisual();
+        }
+
+        protected override void OnRender(DrawingContext drawingContext)
+        {
+            if (ParentMap != null)
+            {
+                var pathGeometry = new PathGeometry();
+                var labels = new List<Label>();
+                var pen = new Pen
+                {
+                    Brush = Foreground,
+                    Thickness = StrokeThickness,
+                };
+
+                DrawGrid(pathGeometry.Figures, labels);
+
+                drawingContext.DrawGeometry(null, pen, pathGeometry);
+
+                if (labels.Count > 0)
+                {
+                    var typeface = new Typeface(FontFamily, FontStyles.Normal, FontWeights.Normal, FontStretches.Normal);
+                    var pixelsPerDip = VisualTreeHelper.GetDpi(this).PixelsPerDip;
+
+                    foreach (var label in labels)
+                    {
+                        var text = new FormattedText(label.Text,
+                            CultureInfo.InvariantCulture, FlowDirection.LeftToRight, typeface, FontSize, Foreground, pixelsPerDip);
+                        var x = label.X + StrokeThickness / 2d + 2d;
+                        var y = label.Y - text.Height / 2d;
+
+                        if (label.Rotation != 0d)
+                        {
+                            drawingContext.PushTransform(new RotateTransform(label.Rotation, label.X, label.Y));
+                            drawingContext.DrawText(text, new Point(x, y));
+                            drawingContext.Pop();
+                        }
+                        else
+                        {
+                            drawingContext.DrawText(text, new Point(x, y));
+                        }
+                    }
+                }
+            }
+        }
+
+        private static PolyLineSegment CreatePolyLineSegment(IEnumerable<Point> points)
+        {
+            return new PolyLineSegment(points, true);
+        }
+    }
+}