


How to Create a Pan and Zoom Image Viewer in WPF Using a Custom Control?
Jan 18, 2025 pm 01:27 PMWPF image pan and zoom custom control
WPF provides a variety of methods to create a basic image viewer to achieve functions such as image panning, zooming, overlay display, and original image display. While built-in controls such as ViewBox
and ImageBrush
can assist with these functions, this article will guide you through custom code implementation to better understand how it works.
Customized ZoomBorder control
To handle panning and zooming, we will create a custom control called ZoomBorder
. This class encapsulates the logic of image transformation.
ZoomBorder implementation
TheZoomBorder
control uses UIElement
as a child element and applies transformations to achieve scaling and panning. The code defines event handlers for mouse wheel, left-button drag, and mouse movement to implement these functions.
Use
in MainWindowIn the MainWindow
window, you can use ZoomBorder
to display and manipulate images. The ZoomBorder
attribute of Child
should be set to the image you want to view.
Scaling algorithm
The scaling algorithm in thechild_MouseWheel
event handler calculates the scaling factor based on the mouse wheel increment and applies it to the ScaleTransform
of the image. It also adjusts the TranslateTransform
to maintain the translation position relative to the mouse pointer.
Translation Algorithm
Thechild_MouseLeftButtonDown
and child_MouseMove
event handlers handle panning. When the user left clicks and drags, the image's TranslateTransform
updates to move the image accordingly.
Reset button implementation
To include a reset button, you add a button to MainWindow
and handle its click event to call ZoomBorder
's Reset
method.
Summary
By implementing customization ZoomBorder
in WPF, you can create a simple but efficient image viewer with pan and zoom functionality. This approach provides greater flexibility and control over the user experience than using predefined controls such as ViewBox
.
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