sdk/samples/WPFSamples/Postcard3D/csharp/highcontrastinkcanvas.cs

   1 using System;
   2 using System.Windows;
   3 using System.Windows.Controls;
   4 using System.Windows.Ink;
   5 using System.Windows.Input;
   6 using System.Windows.Input.StylusPlugIns;
   7 using System.Windows.Media;
   8
   9 namespace Postcard3D
  10 {
  11     class HighContrastInkCanvas : InkCanvas
  12     {
  13         /// <summary>
  14         /// Custom InkCanvas element to collect
  15         /// and render high contrast ink
  16         /// </summary>
  17         public HighContrastInkCanvas()
  18             : base()
  19         {
  20             // set Color, Width and Height for the inner stroke
  21             this.DynamicRenderer.DrawingAttributes.Color = Colors.Chocolate;
  22             this.DynamicRenderer.DrawingAttributes.Width = 3d;
  23             this.DynamicRenderer.DrawingAttributes.Height = 3d;
  24
  25             // create a second DynamicRenderer
  26             outerDynamicRenderer = new DynamicRenderer();
  27             outerDynamicRenderer.DrawingAttributes = this.DefaultDrawingAttributes.Clone();
  28             outerDynamicRenderer.DrawingAttributes.Color = Colors.DarkGreen;
  29             outerDynamicRenderer.DrawingAttributes.Width *= 1.4d;
  30             outerDynamicRenderer.DrawingAttributes.Height *= 1.4d;
  31
  32             // plug the new DynamicRenderer in, so that it can receive
  33             // real-time stylus notifications
  34             this.StylusPlugIns.Add(outerDynamicRenderer);
  35
  36             // re-order the RootVisuals of our DynamicRendererd, so that
  37             // the inner stroke gets rendered on top of the outer stroke
  38             this.InkPresenter.DetachVisuals(this.DynamicRenderer.RootVisual);
  39             this.InkPresenter.AttachVisuals(outerDynamicRenderer.RootVisual, outerDynamicRenderer.DrawingAttributes);
  40             this.InkPresenter.AttachVisuals(this.DynamicRenderer.RootVisual, this.DynamicRenderer.DrawingAttributes);
  41         }
  42
  43         /// <summary>
  44         /// Occurs when a stroke drawn by the user is added to the Strokes property
  45         /// </summary>
  46         protected override void OnStrokeCollected(InkCanvasStrokeCollectedEventArgs e)
  47         {
  48             base.OnStrokeCollected(e);
  49
  50             // create a clone of the collected strokes with new
  51             // DrawingAttributes to represent the outline
  52             DrawingAttributes daOutline = GetOutlineDrawingAttributes(e.Stroke.DrawingAttributes);
  53             Stroke newStroke = new Stroke(e.Stroke.StylusPoints.Clone(), daOutline);
  54
  55             // insert the new strokes at the proper location in
  56             // the stroke collection so that it will be renderer
  57             // behind the original stroke
  58             int index = this.Strokes.IndexOf(e.Stroke);
  59             this.Strokes.Insert(index, newStroke);
  60         }
  61
  62         /// <summary>
  63         /// Occurs when the current editing mode changes
  64         /// </summary>
  65         protected override void OnActiveEditingModeChanged(RoutedEventArgs e)
  66         {
  67             base.OnActiveEditingModeChanged(e);
  68             if (outerDynamicRenderer == null) return;
  69
  70             if (this.ActiveEditingMode == InkCanvasEditingMode.Ink ||
  71                 this.ActiveEditingMode == InkCanvasEditingMode.InkAndGesture ||
  72                 this.ActiveEditingMode == InkCanvasEditingMode.GestureOnly)
  73             {
  74                 outerDynamicRenderer.Enabled = true;
  75             }
  76             else
  77             {
  78                 // prevent dynamic ink rendering when ActiveEditingMode
  79                 // is not one of the inking modes
  80                 outerDynamicRenderer.Enabled = false;
  81             }
  82         }
  83         /// <summary>
  84         /// Creates a new DrawingAttributes instance to represent
  85         /// the outline for given DrawingAttributes
  86         /// </summary>
  87         private DrawingAttributes GetOutlineDrawingAttributes(DrawingAttributes oirginalDrawingAttributes)
  88         {
  89             DrawingAttributes newDrawingAttributes = oirginalDrawingAttributes.Clone();
  90
  91             // set Color, Width and Height for the outer stroke
  92             newDrawingAttributes.Color = Colors.DarkGreen;
  93             newDrawingAttributes.Width *= 1.4d;
  94             newDrawingAttributes.Height *= 1.4d;
  95
  96             return newDrawingAttributes;
  97         }
  98
  99         /// <summary>
 100         /// DynamicRender to render the stroke outline
 101         /// </summary>
 102         DynamicRenderer outerDynamicRenderer = null;
 103     }
 104 }