的RenderTransform VS PushTransform [英] RenderTransform vs PushTransform

问题描述

我有一个形状（下面的红色路径）和我都适用于该路径的 TranslateTransform 和的 ScaleTransform 改造。但是，如果我使用图形 <一href="http://msdn.microsoft.com/en-us/library/system.windows.uielement.rendertransform%28v=vs.90%29.aspx"相对=nofollow>的RenderTransform 这样属性：

I have a shape (the red path below) and i have to apply to this path a TranslateTransform and a ScaleTransform transformation. But if i use the Shape RenderTransform property in this way:

Path MyPath = new Path { Fill = new SolidColorBrush(Colors.Red) };
MyPath.Data = MyPathGeometry;
TransformGroup transf = new TransformGroup();
transf.Children.Add(new TranslateTransform(50, 50));
transf.Children.Add(new ScaleTransform(2, 2));
MyPath.RenderTransform = transf;

我得到这个类型的图：

I get a drawing of this type:

相反，如果我使用的DrawingContext <一href="http://msdn.microsoft.com/en-us/library/system.windows.media.drawingcontext.pushtransform%28v=vs.90%29.aspx"相对=nofollow> PushTransform 这样的方法：

Instead, if I use DrawingContext PushTransform method in this way:

DrawingVisual MyPath = new DrawingVisual();

using (DrawingContext context = MyPath.RenderOpen()) {
   context.PushTransform(new TranslateTransform(50, 50));
   context.PushTransform(new ScaleTransform(2, 2));
   context.DrawGeometry(Brushes.Red, null, MyPathGeometry);
}

我得到这个类型的图：

I get a drawing of this type:

为什么两条路径被放置在不同的方式？使用PushTransform和的RenderTransform之间的区别是什么？我怎么能得到同样的结果在这两种情况下？ 谢谢你。

Why the two paths are placed in a different way? What is the difference between using PushTransform and RenderTransform? How could i get the same result in both cases? Thanks.

推荐答案

所不同的仅仅是其中的转化应用的顺序。

The difference is simply the order in which the transformations are applied.

在第一种情况下（的TransformGroup），你首先由（50，50）翻译，然后按比例（2,2）。在第二种情况下（PushTransform）你第一次大规模，然后进行转换。

In the first case (TransformGroup) you first translate by (50, 50), then scale by (2, 2). In the second case (PushTransform) you first scale, then translate.

在一个的TransformGroup的转换是在顺序执行时，先入先出的顺序，wheras推入变换被在执行堆栈状或后进先出的顺序

The transformations in a TransformGroup are executed in a sequential, first-in-first-out order, wheras the pushed transforms are executed in a stack-like or last-in-first-out order.

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