Databases
StackOverflow2013
Postsdbo
POChanging the Zoom In/Out centerpoint
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POChanging the Zoom In/Out centerpoint
    primarykey
    data
    text
    <p>I'm writing a WPF application that displays a XAML object (it's basically a map drawn in XAML). As part of its features, it should zoom in/out and pan. The panning works fine, and the zoom zooms, but I can't quite understand how to zoom to a specific point, like my mouse cursor, for example.</p> <p>This is my current code:</p> <pre><code>internal void PerformZoom(float ZoomFactor, Point ZoomCenterPoint) { m_originalTransform = m_canvas.RenderTransform; float newZoomFactor = m_oldZoomFactor + ZoomFactor; float scaleToApply = (newZoomFactor / m_oldZoomFactor); m_totalZoom = newZoomFactor; var st = new ScaleTransform(scaleToApply, scaleToApply); TransformGroup tg = new TransformGroup(); tg.Children.Add(m_originalTransform); tg.Children.Add(st); m_canvas.RenderTransform = tg; m_oldZoomFactor = newZoomFactor; } </code></pre> <p><strong>[edit]</strong> Found the solution - Just edited the CenterX / CenterY properties of the transformation and it worked like a charm. Thanks for all your help!</p> <p><strong>[edit2]</strong> Here's a viable solution (considering the mouse position):</p> <pre><code>public partial class MainWindow { private float currentZoom = 1f; private const float StepSize = .2f; public MainWindow() { InitializeComponent(); } private void MainGrid_OnMouseWheel(object sender, MouseWheelEventArgs e) { var pos = 1; if (e.Delta &lt; 0) { pos = -1; } var mousePosition = e.MouseDevice.GetPosition(MainGrid); currentZoom += StepSize * pos; var transform = new ScaleTransform(currentZoom, currentZoom, mousePosition.X, mousePosition.Y); MainGrid.RenderTransform = transform; } } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USJonathan Perry
    1. USJonathan Perry
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POChanging the Zoom In/Out centerpoint
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload