StylusPointCollection Object
Represents a collection of related StylusPoint objects.
| XAML |
<StylusPointCollection ...> oneOrMoreStylusPoints </StylusPointCollection> |
| Scripting |
To create an object using scripting, see CreateFromXAML.
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XAML Values
| oneOrMoreStylusPoints | One or more StylusPoint object elements. |
Properties
Methods
Add, AddStylusPoints, Clear, Equals, FindName, GetHost, GetItem, GetValue, Insert, Remove, RemoveAt, SetValue
Remarks
This collection is used primarily by the Stroke class to keep track of the StylusPoint objects that define the appearance of the Stroke object.
A StylusPointCollection can belong to more than one Stroke object.
Collection methods such as Add or GetItem will expect or return objects that are of type StylusPoint. In addition to Collection methods, this collection also defines the method AddStylusPoints.
The XAML syntax for properties that use a StylusPoint is potentially an example of an implicit collection syntax, where you can omit an actual StylusPointCollection object element. However, prepopulating an InkPresenter with strokes is not a common technique; usually you start with a blank Strokes collection and capture strokes as user input with runtime JavaScript. For more information about XAML implicit collection syntax, see XAML Syntax Overview.
Examples
| JavaScript |
|---|
// Inking variables
var agCtrl;
var inkPresenter; // Corresponds to InkPresenter element in XAML
var newStroke = null; // The Stroke variable we'll use here in mouse handlers
function root_Loaded(sender, args)
{
// Get the html object which contains the Silverlight plug-in.
agCtrl = sender.GetHost();
// hold on to the InkPresenter plug-in interface
inkPresenter = sender.findname("inkPresenterElement");
}
// Capture mouse and create the stroke
function InkPresenterMouseDown(sender,args)
{
inkPresenter.CaptureMouse();
// Erase mode?
if (args.GetStylusInfo().IsInverted)
{
var sc = agCtrl.content.createFromXaml("<StrokeCollection/>");
sc = inkPresenter.Strokes.HitTest(args.GetStylusPoints(inkPresenter));
for (var i = 0; i < sc.Count; i++)
{
inkPresenter.Strokes.Remove(sc.GetItem(i));
}
}
else // Ink mode
{
newStroke = agCtrl.content.createFromXaml('<Stroke/>');
var da = agCtrl.content.createFromXaml('<DrawingAttributes/>');
newStroke.DrawingAttributes = da;
var spc = agCtrl.content.createFromXaml('<StylusPointCollection/>');
newStroke.StylusPoints = spc;
newStroke.DrawingAttributes.Width = 5;
newStroke.DrawingAttributes.Height = 5;
newStroke.DrawingAttributes.Color = "Green";
newStroke.DrawingAttributes.OutlineColor = "Black";
newStroke.StylusPoints.AddStylusPoints(args.GetStylusPoints(inkPresenter));
inkPresenter.Strokes.Add(newStroke);
}
}
// Add the new points to the Stroke we're working with
// or delete strokes if we are in erase mode
function inkPresenterMouseMove(sender, args)
{
var stylusPoints = args.getStylusPoints(sender);
// Erase Mode?
if (lastErasePoint != null)
{
// connect the point from previous mouse event
// to the current collection of stylus points
stylusPoints.insert(0, lastErasePoint);
var hitStrokes = sender.strokes.hitTest(stylusPoints);
// Remove the strokes that were intersected above
for (var i = 0; i < hitStrokes.Count; i++)
{
sender.strokes.remove(hitStrokes.getItem(i));
}
// update the cached last erase point
lastErasePoint = stylusPoints.getItem(stylusPoints.count-1);
}
// Ink Mode?
if (newStroke != null)
{
newStroke.stylusPoints.addStylusPoints(stylusPoints);
}
}
// Release the mouse
function InkPresenterMouseUp(sender,args)
{
newStroke = null;
inkPresenter.ReleaseMouseCapture();
}
function ClearInkMouseDown(sender,args)
{
inkPresenter.Strokes.Clear();
}
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