Width (DrawingAttributes)

Silverlight

Gets or sets the width of the associated stroke.

<object Width="Double"  .../>
value = object.Width
object.Width = value

Type: Double

The width of the associated stroke, in pixels.

This property is read/write. The default value is 3.0.

The discrete Height and Width properties on a DrawingAttributes object support creating an ink pen that has a horizontal/vertical stroke bias.

The following JavaScript example simulates three pen types (pen, marker, and highlighter) by setting the Color, Height, OutlineColor, and Width properties of a DrawingAttributes object. A DrawingAttributes object is first created, and then appended to the Stroke object. The DrawingAttributes properties are then set by one of the three events that simulate a pen type. The EraseCanvas event clears all the Strokes from the Canvas.

var agCtrl;
var inkPresenter; // Corresponds to InkPresenter element in XAML.
var newStroke = null; // The Stroke variable we'll use here in mouse handlers.
// DrawingAttributes variables.
var daWidth = 2;
var daHeight = 2;
var daColor = "Black";
var daOutlineColor = "Black";

function root_Loaded(sender, args) 
{
    // Get the HTML object that contains the Silverlight plug-in.
    agCtrl = sender.GetHost();
    inkPresenter = sender.findname("inkPresenterElement");
}

// Capture mouse movement when the left button is pressed, and create the stroke.
function InkPresenterMouseDown(sender,args)
{
   inkPresenter.CaptureMouse();
   
   newStroke = agCtrl.content.createFromXaml('<Stroke/>');
   
   var da = agCtrl.content.CreateFromXaml('<DrawingAttributes/>');
   newStroke.DrawingAttributes = da;
   
   // Set the drawing attributes properties.
   newStroke.DrawingAttributes.Width = daWidth;
   newStroke.DrawingAttributes.Height = daHeight;
   newStroke.DrawingAttributes.Color = daColor;
   newStroke.DrawingAttributes.OutlineColor = daOutlineColor;
   
   newStroke.StylusPoints.AddStylusPoints(args.GetStylusPoints(inkPresenter));
   inkPresenter.Strokes.Add(newStroke);
}

// Add the new points to the Stroke we're working with.
function InkPresenterMouseMove(sender,args)
{
   if (newStroke != null)
   {
      newStroke.StylusPoints.AddStylusPoints(args.GetStylusPoints(inkPresenter));
   }
}

// Release the mouse.
function InkPresenterMouseUp(sender,args)
{
   newStroke = null;
   inkPresenter.ReleaseMouseCapture();
}

// Set the drawing attributes for a pen.
function SelectPen(sender, args)
{
  daWidth = 1;
  daHeight = 1;
  daColor = "Black";
  daOutlineColor = "Black";
}

// Set the drawing attributes for a marker.
function SelectMarker(sender, args)
{
  daWidth = 10;
  daHeight = 4;
  daColor = "Blue";
  daOutlineColor = "Blue";
}

// Set the drawing attributes for a highlighter.
function SelectHighlighter(sender, args)
{
  daWidth = 25;
  daHeight = 5;
  daColor = "Yellow";
  daOutlineColor = "Yellow";
}

// Erase all strokes from the canvas.
function EraseCanvas(sender, args)
{
  inkPresenter.Strokes.Clear();
}

The following XAML example creates the canvas, the four buttons that are used to select the different pen types, and the Erase All feature that is simulated by the JavaScript events in the previous example.

<Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Loaded="root_Loaded"
        x:Name="root"
        Width="600" Height="400">
  <InkPresenter
     x:Name="inkPresenterElement" 
    Background="transparent" 
    Width="600" Height="400" 
    MouseLeftButtonDown="InkPresenterMouseDown" 
    MouseMove="InkPresenterMouseMove" 
    MouseLeftButtonUp="InkPresenterMouseUp"/>

<!-- Pen Button -->
  <Rectangle 
    Height="30" Width="125" 
    Canvas.Top="375" Canvas.Left="40" 
    Stroke="Gray" Fill="Black" StrokeThickness="1.5" 
    RadiusX="2" RadiusY="2" 
    Opacity="1.0"/>    
  <TextBlock 
    Height="21" Width="78" 
    Canvas.Top="380" Canvas.Left="71"
    Foreground="Gray"
    FontFamily="Verdana" FontSize="12">Select Pen</TextBlock>

  <Rectangle 
    Height="30" Width="125" 
    Canvas.Top="375" Canvas.Left="40" 
    x:Name="selectPen" MouseLeftButtonDown="SelectPen" 
    Stroke="Transparent" Fill="Transparent" StrokeThickness="1.5"  
    RadiusX="2" RadiusY="2" 
    Opacity="1.0"/>
    
<!-- Marker Button -->
  <Rectangle 
    Height="30" Width="125" 
    Canvas.Top="375" Canvas.Left="170" 
    Stroke="Gray" Fill="Black" StrokeThickness="1.5" 
    RadiusX="2" RadiusY="2" 
    Opacity="1.0"/>
    
  <TextBlock 
    Height="21" Width="78" 
    Canvas.Top="380" Canvas.Left="191"
    Foreground="Gray"
    FontFamily="Verdana" FontSize="12">Select Marker</TextBlock>

  <Rectangle 
    Height="30" Width="125" 
    Canvas.Top="375" Canvas.Left="170" 
    x:Name="selectMarker" MouseLeftButtonDown="SelectMarker" 
    Stroke="Transparent" Fill="Transparent" StrokeThickness="1.5"  
    RadiusX="2" RadiusY="2" 
    Opacity="1.0"/>
    
<!-- Highlighter Button -->
  <Rectangle 
    Height="30" Width="125" 
    Canvas.Top="375" Canvas.Left="300" 
    Stroke="Gray" Fill="Black" StrokeThickness="1.5" 
    RadiusX="2" RadiusY="2" 
    Opacity="1.0"/>
    
  <TextBlock 
    Height="21" Width="78" 
    Canvas.Top="380" Canvas.Left="310"
    Foreground="Gray"
    FontFamily="Verdana" FontSize="12">Select Highlighter</TextBlock>

  <Rectangle 
    Height="30" Width="125" 
    Canvas.Top="375" Canvas.Left="300" 
    x:Name="selectHighlighter" MouseLeftButtonDown="SelectHighlighter" 
    Stroke="Transparent" Fill="Transparent" StrokeThickness="1.5"  
    RadiusX="2" RadiusY="2" 
    Opacity="1.0"/>
    
<!-- Erase Canvas Button -->
  <Rectangle 
    Height="30" Width="125" 
    Canvas.Top="375" Canvas.Left="430" 
    Stroke="Gray" Fill="Black" StrokeThickness="1.5" 
    RadiusX="2" RadiusY="2" 
    Opacity="1.0"/>
    
  <TextBlock 
    Height="21" Width="78" 
    Canvas.Top="380" Canvas.Left="463"
    Foreground="Gray"
    FontFamily="Verdana" FontSize="12">Erase All</TextBlock>

  <Rectangle 
    Height="30" Width="125" 
    Canvas.Top="375" Canvas.Left="430" 
    x:Name="eraseCanvas" MouseLeftButtonDown="EraseCanvas" 
    Stroke="Transparent" Fill="Transparent" StrokeThickness="1.5"  
    RadiusX="2" RadiusY="2" 
    Opacity="1.0"/>
</Canvas>

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