WPF-缩放图像（在大小受限制的项目控件内）

<Canvas x:Name=\"m_canvas\" MaxWidth=\"300\" MaxHeight=\"300\" >
   <Image Source=\"...\"
      Width=\"300\"
      Height=\"300\" />
</Canvas>

var matrix = ((MatrixTransform)m_image.RenderTransform).Matrix;

var center = new Point(m_image.ActualWidth / 2, m_image.ActualHeight / 2);
center = matrix.Transform(center);

matrix.ScaleAt(delta.Scale.X, delta.Scale.Y, center.X, center.Y);

((MatrixTransform)m_image.RenderTransform).Matrix = matrix;