如何将比例转换应用于DrawingContext? [英] How do you apply a Scale Translation to a DrawingContext?

问题描述

我有一个Canvas，在XAML中应用了比例转换.使用DrawingContext我在Canvas上画线.我现在需要在屏幕上添加文本.我以为格式化文本可以应用翻译，但是格式化文本或DrawingContext都不接受RenderTransform.如何对文本应用比例尺转换，以便抵消画布的比例尺转换?

I have a Canvas with a scale translation applied in XAML. Using DrawingContext I draw lines on the Canvas. I now need to add text to the screen. I thought with formatted text I could apply a translation, but neither Formatted Text or DrawingContext accepts RenderTransform. How do I apply a scale translation to the text so it will counter the scale translation of the canvas?

 ftext = New FormattedText("N", CultureInfo.GetCultureInfo("en-us"), Windows.FlowDirection.LeftToRight, face, Me.DBFontSize, FalconDataBlock.Foreground)
 context.DrawText(ftext, .TargetLineInfo.EndAsWinPoint)

推荐答案

在大多数UI应用程序中，正确的做法可能是将子TextBlock添加到Canvas，然后更改TextBlock的RenderTransform，而不是使用DrawingContext.

In most UI apps, instead of using a DrawingContext, the right thing to do might be to add a child TextBlock to the Canvas, and change the TextBlock's RenderTransform.

但是，假设您有充分的理由使用DrawingContext，则可以使用 DrawingContext.Pop 恢复使用DrawText完成操作后的先前状态.

However, assuming you have a good reason for using a DrawingContext, you could use DrawingContext.PushTransform to push the transform you need (scale, translation, etc.), just before you invoke DrawText. Use DrawingContext.Pop to restore the prior state after you're done with DrawText.

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