forum

Home / DeveloperSection / Forums / How can I print a canvas in wpf?

Ask Question

How can I print a canvas in wpf?

Takeshi Okada400616-Aug-2013
Hi mindstick!

I used these code in order to print out the UI. Printing out is working, but if the size of paper is over, the UI cuts off in the middle of a canvas.

Is there any possible way not to be cut off in the middle?

<--cs code-->

PrintDialog dialog = new PrintDialog();

dialog.PrintVisual(lst , "print");

<--Xaml -->

<ListView Name="lst">

    <Grid Name="grdPrint">

        <Grid.RowDefinitions>

            <RowDefinition />

            <RowDefinition />

        </Grid.RowDefinitions>

        <Canvas  Grid.Row="0"    >

           .......

        </Canvas>

        <HListBox x:Name="lstImage" ItemsSource="{Binding IMG, Mode=TwoWay}" Grid.Row="1" IsHitTestVisible="True">

            <HListBox.ItemTemplate>

                <DataTemplate>

                    <HImage Margin="0"  Width="590"  Height="590" Stretch="Fill" Source="{Binding IMG_PATH_NM, Converter={StaticResource StrUriConverter}}" Tag="{Binding IMG_PATH_NM}">

                    </HImage>

                </DataTemplate>

            </HListBox.ItemTemplate>

            <HListBox.ItemsPanel>

                <ItemsPanelTemplate>

                    <StackPanel Orientation="Vertical" HorizontalAlignment="Center"  IsHitTestVisible="True"/>

                </ItemsPanelTemplate>

            </HListBox.ItemsPanel>

        </HListBox>

    </Grid>

</ListView>

Thanks kin advance


wpfwpf 
Updated on 17-Aug-2013
Takeshi Okada

Takeshi Okada

Follow

Can you answer this question?

Answer

1 Answers

shreesh chandra shukla

shreesh chandra shukla

17-Aug-2013
Hi!

This method will print the canvas to PNG file.

public void ExportToPNG(string imgpath, Canvas surface)
{
    Uri path = new Uri(imgpath);
    if (path == null)
        return;
    Transform transform = surface.LayoutTransform;
    surface.LayoutTransform = null; 
    Size size = new Size(surface.Width, surface.Height);
    surface.Measure(size);
    surface.Arrange(new Rect(size));
    RenderTargetBitmap renderBitmap =
        new RenderTargetBitmap(
        (int)size.Width,
        (int)size.Height,
        96d,
        96d,
        PixelFormats.Pbgra32);
    renderBitmap.Render(surface);
    using (FileStream outStream = new FileStream(path.LocalPath, FileMode.Create))
    {
        PngBitmapEncoder encoder = new PngBitmapEncoder();
        encoder.Frames.Add(BitmapFrame.Create(renderBitmap));
        encoder.Save(outStream);
    }
    surface.LayoutTransform = transform;
}

thanks

Liked By