CreateTransforms()
{
// The zoom is controlled by a ScaleTransform used as the first of two
// render transforms. If its ScaleX and ScaleY properties are set to
// 2.0, for example, the graph is rendered twice as large as normal and
// doesn't fit within the control.
//
// This ScaleTransform does not affect the ActualWidth and ActualHeight
// properties.
TransformGroup oTransformGroup = new TransformGroup();
oTransformGroup.Children.Add( new ScaleTransform() );
// The zoom center is controlled by a TranslateTransform used as a
// second render transform. If its X property is set to -100, for
// example, then the graph, which has been scaled by the group's first
// transform, is translated to the left by 100 scaled units.
oTransformGroup.Children.Add( new TranslateTransform() );
this.RenderTransform = oTransformGroup;
// Note that mouse coordinates as reported by
// MouseEventArgs.GetLocation() are affected by both transforms.
// Because of this, it is sometimes more convenient to convert the
// mouse coordinates to screen coordinates, which are not affected by
// any of the transforms.
}
