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Ellipses do not scale with zoom in WPF sample

See original GitHub issue

Hi and thank you for this repo,

When zooming, ellipses defined in a MapItemsControl do not appear to scale with the zoom level. As you zoom out they get bigger instead of smaller. This is the opposite behavior of a statically defined ellipse, which correctly scales (gets smaller) as you zoom out:

For instance, this works as described above (from your WPF sample app):

<map:MapPath Location="53.5,8.2" Stroke="Blue" StrokeThickness="3" Fill="#1F007F00">
                    <EllipseGeometry RadiusX="1852" RadiusY="1852"/>

But this doesn’t work; Extending your WPF Sample, I display an ellipse for each point location you’ve defined. They display perfectly fine, but as you zoom out they get bigger (whereas static ellipse stays a fixed size)

<Style x:Key="EllipseItemStyle" TargetType="map:MapItem">
            <Setter Property="map:MapPanel.Location" Value="{Binding Location}"/>
            <Setter Property="Template">
                    <ControlTemplate TargetType="map:MapItem">
                            <map:MapPath Fill="Red" Opacity="0.7">
                                    <EllipseGeometry RadiusX="100" RadiusY="100"/>

And then beside the other mapcontrols:

 <map:MapItemsControl ItemsSource="{Binding Points}"
                                 ItemContainerStyle="{StaticResource EllipseItemStyle}"

Issue Analytics

  • State:closed
  • Created 3 years ago
  • Comments:17 (10 by maintainers)

github_iconTop GitHub Comments

ClemensFischercommented, Nov 6, 2022

There is now a read-only MapTransform property in the MapItem class, which scales and rotates from map to view coordinates.

It may be used like this:

<ControlTemplate TargetType="map:MapItem">
    <Path Fill="Green" Opacity="0.2"
          RenderTransform="{Binding MapTransform, RelativeSource={RelativeSource TemplatedParent}}">
            <EllipseGeometry RadiusX="100" RadiusY="100"/>
ClemensFischercommented, Nov 3, 2022

@YiehraiS Forgot a commit or push last night. Will do later. For the scale bar, see the MapScale class.

Read more comments on GitHub >

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