RenderTransformsは、レンダリングにのみ影響するため、コントロールの幅と高さを変更しません。より良い方法があるかどうかはわかりませんが、元のサイズと倍率を使用してレンダリングサイズを簡単に計算できます。
これは非常に基本的な例です
xaml
<Canvas x:Name="cnv" Grid.Row="1">
<Rectangle Canvas.Top="150" Canvas.Left="150"
Width="200" Height="200" x:Name="myrect"
Fill="AliceBlue"
ManipulationStarted="myrect_ManipulationStarted"
ManipulationDelta="myrect_ManipulationDelta"
ManipulationCompleted="myrect_ManipulationCompleted">
</Rectangle>
</Canvas>
コード
public MainPage()
{
InitializeComponent();
transformGroup = new TransformGroup();
translation = new TranslateTransform();
scale = new ScaleTransform();
transformGroup.Children.Add(scale);
transformGroup.Children.Add(translation);
myrect.RenderTransform = transformGroup;
}
private TransformGroup transformGroup;
private TranslateTransform translation;
private ScaleTransform scale;
private void myrect_ManipulationStarted(object sender, ManipulationStartedEventArgs e)
{
//change the color of the Rectangle to a half transparent Red
myrect.Fill = new SolidColorBrush(Color.FromArgb(127, 255, 0, 0));
}
private void myrect_ManipulationDelta(object sender, ManipulationDeltaEventArgs e)
{
translation.X += e.DeltaManipulation.Translation.X;
translation.Y += e.DeltaManipulation.Translation.Y;
//Scale the Rectangle
if (e.DeltaManipulation.Scale.X != 0)
scale.ScaleX *= e.DeltaManipulation.Scale.X;
if (e.DeltaManipulation.Scale.Y != 0)
scale.ScaleY *= e.DeltaManipulation.Scale.Y;
}
private void myrect_ManipulationCompleted(object sender, ManipulationCompletedEventArgs e)
{
myrect.Fill = new SolidColorBrush(Color.FromArgb(255, 255, 0, 0));
Debug.WriteLine(myrect.Width * scale.ScaleX);
Debug.WriteLine(myrect.Height * scale.ScaleY);
}