不使用scrollviewer进行缩放 [英] Zoom without using scrollviewer

问题描述

大家好，

我目前正在使用可以由用户移动的多个控件的画布。如何在不使用滚动查看器的情况下允许用户放大画布？使用translate转换来缩放画布会对其上的控件执行任何操作吗？ 

I'm currently working with a canvas with multiple controls that can be moved by the users. How do I allow the users to zoom into the canvas without using a scrollviewer? Would using translate transform to scale the canvas do anything to the controls on it? 

提前谢谢！

推荐答案

您好ChloeLee，



您可以使用GestureRecognizer API来移动，旋转或缩放元素。请参阅官方的BasicInput示例。

https：// github.com/Microsoft/Windows-universal-samples/tree/master/Samples/BasicInput

GestureSettings GenerateDefaultSettings()
{
	return GestureSettings.ManipulationTranslateX |
		GestureSettings.ManipulationTranslateY |
		GestureSettings.ManipulationRotate |
		GestureSettings.ManipulationTranslateInertia |
		GestureSettings.ManipulationRotateInertia|
		GestureSettings.ManipulationScale;
}
void OnManipulationUpdated(object sender, ManipulationUpdatedEventArgs e)
{
	previousTransform.Matrix = cumulativeTransform.Value;

	// Get the center point of the manipulation for rotation
	Point center = new Point(e.Position.X, e.Position.Y);
	deltaTransform.CenterX = center.X;
	deltaTransform.CenterY = center.Y;
	// Look at the Delta property of the ManipulationDeltaRoutedEventArgs to retrieve
	// the rotation, X, and Y changes
	deltaTransform.Rotation = e.Delta.Rotation;
	deltaTransform.TranslateX = e.Delta.Translation.X;
	deltaTransform.TranslateY = e.Delta.Translation.Y;

	deltaTransform.ScaleX = deltaTransform.ScaleY = e.Delta.Scale;
}

最好的问候，

David

Best Regards,
David

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