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Xamarin Cameraview preview size (V21)

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#1 Posted : Tuesday, November 10, 2020 12:05:47 PM(UTC)

Will S

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Posts: 3

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In a project involving scanning driver licenses using the cameraview, I'm trying to implement a toggle-able preview window using .IsVisible.

I'm sticking the cameraview in smallish cell in a grid, and what the preview shows is not a scaled image of the entire field of view of the camera, but only the portion of it visible in the grid cell, relative to the entire screen.

Is that case or am I missing something?

For clarity - it seems like if I put a cameraview in row 0, column 1 of a 2*2 grid, the preview shows only the upper right portion of the camera's field of view. If the grid is in a stacklayout,


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#2 Posted : Wednesday, November 11, 2020 4:48:09 PM(UTC)

Matthew Bresson

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Posts: 98

Was thanked: 3 time(s) in 3 post(s)

Hello Will,

My name is Matt and I am a member of the LEADTOOLS Support Team.
I will be happy to assist you with any question you may have.

I ran a few tests in LEADTOOLS v21 with the grid view, stacklayout, and the CameraView. I found that using the code below allow the CameraView to be scaled to see the entire view of the camera, even if only a portion of the "mainGrid".

Code:

<StackLayout>
      <!--main grid container for everything-->
      <Grid x:Name="mainGrid" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
         <Grid.ColumnDefinitions>
            <ColumnDefinition x:Name="c0" Width="*"/>
            <ColumnDefinition x:Name="c1" Width="*"/>
            <ColumnDefinition x:Name="c2" Width="*"/>
         </Grid.ColumnDefinitions>
         <Grid.RowDefinitions>
            <RowDefinition x:Name="r0" Height="*"/>
            <RowDefinition x:Name="r1" Height="*"/>
            <RowDefinition x:Name="r2" Height="*"/>
         </Grid.RowDefinitions>
         <namespace:CameraView x:Name="leadCamera" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2" Grid.RowSpan="2" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"/>
      </Grid>
</StackLayout>

Please see the attached screenshot for example. If the issue persists on your end, please feel free to reach back out to me.

Thanks

Matt Bresson
Developer Support Engineer
LEAD Technologies, Inc.

1 user thanked Matthew Bresson for this useful post.

Will S on 11/16/2020(UTC)

#3 Posted : Monday, November 16, 2020 8:46:06 AM(UTC)

Will S

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Posts: 3

Thanks: 1 times

Hey there, thank you. Is it possible to size the CameraView in an AbsoluteLayout as well?

#4 Posted : Monday, November 16, 2020 4:04:51 PM(UTC)

Matthew Bresson

Groups: Registered, Tech Support, Administrators
Posts: 98

Was thanked: 3 time(s) in 3 post(s)

Hello Will,

Yes, you can size the CameraView in an AbsoluteLayout. See the code and screenshot below:

Code:


<AbsoluteLayout VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
      <namespace:CameraView x:Name="leadCamera" AbsoluteLayout.LayoutBounds="0.25, 0.25, 0.5, 0.5" AbsoluteLayout.LayoutFlags="All"/>
</AbsoluteLayout>

Thanks

Matt Bresson
Developer Support Engineer
LEAD Technologies, Inc.

#5 Posted : Monday, November 16, 2020 4:43:48 PM(UTC)

Will S

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Posts: 3

Thanks: 1 times

Thanks. I love this library.

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