Renderer.Measure Method (Stroke, DrawingAttributes)

Article
12/08/2012

Calculates the Rectangle on the device context needed to contain the Stroke object to be drawn with the Draw method of the Renderer object by using the specified DrawingAttributes.

Namespace: Microsoft.Ink
Assembly: Microsoft.Ink (in Microsoft.Ink.dll)

Syntax

'Declaration
Public Function Measure ( _
    stroke As Stroke, _
    da As DrawingAttributes _
) As Rectangle
'Usage
Dim instance As Renderer 
Dim stroke As Stroke 
Dim da As DrawingAttributes 
Dim returnValue As Rectangle 

returnValue = instance.Measure(stroke, _
    da)

public Rectangle Measure(
    Stroke stroke,
    DrawingAttributes da
)

public:
Rectangle Measure(
    Stroke^ stroke, 
    DrawingAttributes^ da
)

public function Measure(
    stroke : Stroke, 
    da : DrawingAttributes
) : Rectangle

Parameters

stroke
Type: Microsoft.Ink.Stroke

The Stroke object to measure.

da
Type: Microsoft.Ink.DrawingAttributes

The DrawingAttributes to use when calculating the rectangle, which override the DrawingAttributes property of the Stroke object.

Return Value

Type: System.Drawing.Rectangle
The Rectangle on the device context needed to contain the were drawn with the Draw method of the Renderer object. The stroke must contain x-coordinates and y-coordinates to calculate the rectangle. Otherwise, the method returns an empty rectangle.

Remarks

This method is accurate only if you pass the same arguments to both the Measure and Draw methods.

Because the bounding box is affected by the pen width, this width is scaled appropriately for the Renderer object's view transform. To do this, the pen width is multiplied by the square root of the determinant of the view transform. The height and width of the bounding box are expanded by half this amount in each direction, and the right and bottom sides are incremented by one.

For example, consider that the pen width is originally 53, the square root of the determinant of the view transform is 50, and the bounding box is (0, 0, 1000, 1000). The pen width adjustment to the bounding box in each direction is calculated as (53 * 50) / 2, and the right and bottom sides are incremented by one. This results in a rendered bounding box of (-1325, -1325, 2326, 2326).

Examples

This C# example gets the bounding rectangle for a Stroke object, theStroke, when the pen width doubles. The Renderer object comes from the InkOverlay object, theInkOverlay.

DrawingAttributes drawingAtt = theStroke.DrawingAttributes.Clone();
drawingAtt.Width = drawingAtt.Width * 2;
Rectangle bounds = theInkOverlay.Renderer.Measure(theStroke, drawingAtt);

This Microsoft® Visual Basic® .NET example gets the bounding rectangle for a Stroke object, theStroke, when the pen width doubles. The Renderer object comes from the InkOverlay object, theInkOverlay.

Dim drawingAtt As DrawingAttributes = theStroke.DrawingAttributes.Clone();
drawingAtt.Width = drawingAtt.Width * 2;
Dim bounds As Rectangle = theInkOverlay.Renderer.Measure(theStroke, drawingAtt);

Platforms

Windows 7, Windows Vista, Windows Server 2008 R2, Windows Server 2008

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.0

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