wpf 鼠标滚动轮缩放MouseWheel
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var pointToContent = group.Inverse.Transform(point);
var transform = group.Children[0] as ScaleTransform;
if (transform.ScaleX + delta < min) return;
if (transform.ScaleX + delta > max) return;
transform.ScaleX += delta;
transform.ScaleY += delta;
var transform1 = group.Children[1] as TranslateTransform;
transform1.X = -1 * ((pointToContent.X * transform.ScaleX) - point.X);
transform1.Y = -1 * ((pointToContent.Y * transform.ScaleY) - point.Y);
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