Strokes.Transform Method (Matrix, Boolean)

Article
10/19/2012

Applies a linear transformation to a Strokes collection, with the option of applying the transformation to the pen width.

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

Syntax

'Declaration
Public Sub Transform ( _
    inkTransform As Matrix, _
    applyOnPenWidth As Boolean _
)
'Usage
Dim instance As Strokes 
Dim inkTransform As Matrix 
Dim applyOnPenWidth As Boolean

instance.Transform(inkTransform, applyOnPenWidth)

public void Transform(
    Matrix inkTransform,
    bool applyOnPenWidth
)

public:
void Transform(
    Matrix^ inkTransform, 
    bool applyOnPenWidth
)

public function Transform(
    inkTransform : Matrix, 
    applyOnPenWidth : boolean
)

Parameters

inkTransform
Type: System.Drawing.Drawing2D.Matrix

The System.Drawing.Drawing2D.Matrix transform to use on the Strokes collection.

applyOnPenWidth
Type: System.Boolean

The Boolean value that indicates whether to apply the transform to the width of the ink in the DrawingAttributes of the Stroke objects in the Strokes collection.

Value

Meaning

true

The transformation applies to both the points and pen width.

false

The transformation applies only to the points.

Value	Meaning
true	The transformation applies to both the points and pen width.
false	The transformation applies only to the points.

Remarks

The linear transform can represent scaling, rotation, translation, and combinations of transformations.

If the pen width is scaled appropriately for the transform, the drawn pen width is calculated by multiplying the specified pen width (or default of 53, if unspecified) by the square root of the determinant of the transform.

Examples

In this example, the Strokes collection attached to an InkOverlay object is scaled by a factor of two. The scaling occurs around the center of the bounding box of the Strokes collection. The width of the ink is also scaled by a factor of two.

' Access to the Strokes property returns a copy of the Strokes object. 
' This copy must be implicitly (via using statement) or explicitly 
' disposed of in order to avoid a memory leak. 
Using allStrokes As Strokes = mInkOverlay.Ink.Strokes

    Dim inkTransform As Matrix = New Matrix()
    Dim bounds As Rectangle = allStrokes.GetBoundingBox()
    Dim center As PointF = _
        New PointF(0.5F * (bounds.Left + bounds.Right), _
                   0.5F * (bounds.Top + bounds.Bottom))

    ' Translate to center of bounding box
    inkTransform.Translate(center.X, center.Y)
    ' Scale by factor of 2
    inkTransform.Scale(2.0F, 2.0F)
    ' Translate back
    inkTransform.Translate(-center.X, -center.Y)
    ' Transform strokes
    allStrokes.Transform(inkTransform, True)
End Using

// Access to the Strokes property returns a copy of the Strokes object. 
// This copy must be implicitly (via using statement) or explicitly 
// disposed of in order to avoid a memory leak. 
using (Strokes allStrokes = mInkOverlay.Ink.Strokes)
{
    Matrix inkTransform = new Matrix();
    Rectangle bounds = allStrokes.GetBoundingBox();
    PointF center = new PointF(0.5f * (bounds.Left + bounds.Right),
                               0.5f * (bounds.Top + bounds.Bottom));
    // Translate to center of bounding box
    inkTransform.Translate(center.X, center.Y);
    // Scale by factor of 2
    inkTransform.Scale(2.0F, 2.0F);
    // Translate back
    inkTransform.Translate(-center.X, -center.Y);
    // Transform strokes
    allStrokes.Transform(inkTransform, true);
}

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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