How to zoom image by percentage in WPF C#?

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I have combobox with value 10%,25%,50%,100%,125%, on selection i want to zoom image. How can I do this?

here is my xaml for image, and i hvae combobox with values. how to do this

thanks.

What I have tried:

XML

<pre><ScrollViewer x:Name="ImgScroll" Grid.Column="0" Margin="5" Background="White" >
                    <ScrollViewer.Style>
                        <Style TargetType="{x:Type ScrollViewer}">
                            <Setter Property="HorizontalScrollBarVisibility" Value="Disabled"/>
                            <Setter Property="VerticalScrollBarVisibility" Value="Disabled"/>
                        </Style>
                    </ScrollViewer.Style>
                    <Border x:Name="ViewedPhotoArea" Padding="4" Margin="4" Background="White" BorderBrush="#22000000" BorderThickness="0" Visibility="Visible" ClipToBounds="True" >
                        <Border.RenderTransform>
                            <TranslateTransform 
                            X="{Binding HorizontalOffset}" 
                            Y="{Binding VerticalOffset}" />
                        </Border.RenderTransform>

                        <Image  x:Name="imgCurrent"
                                Margin="50"  RenderTransformOrigin="0.5, 0.5" IsManipulationEnabled="True"  
                                RenderOptions.BitmapScalingMode="HighQuality" RenderOptions.EdgeMode="Aliased" >
                            <Image.LayoutTransform>
                                <TransformGroup>
                                    <ScaleTransform x:Name="ScaleTrans" />
                                </TransformGroup>
                            </Image.LayoutTransform>
                            <Image.Effect>
                                <DropShadowEffect BlurRadius="20" ShadowDepth="0" Opacity="0.8"   Color="Black" />
                            </Image.Effect>
                        </Image>
                    </Border>
                </ScrollViewer>

Posted 10-Dec-17 21:59pm

Member 11859517

Updated 10-Dec-17 22:42pm

v2

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Richard MacCutchan · Answer 1 · 2017-12-10T22:42:00

Solution 1

A WPF Custom Control for Zooming and Panning[^]

Posted 10-Dec-17 22:42pm

Richard MacCutchan

Comments

Member 11859517 11-Dec-17 5:09am

Thanks for reply,
I don't want to create any custom control. i want just want to zoom. like scale transform.

Richard MacCutchan 11-Dec-17 5:14am

wpf zoom scale transform - Google Search[^]

Member 11859517 11-Dec-17 5:31am

thanks,
I am able to zoom on mouse wheel,
if (e.Delta > 0)
{
if (count < 3)
{
this.ScaleTrans.ScaleX += e.Delta * 0.002;
this.ScaleTrans.ScaleY += e.Delta * 0.002;

count++;
}

}
else if (e.Delta < 0)
{
if (count > 0)
{
this.ScaleTrans.ScaleX += e.Delta * 0.002;
this.ScaleTrans.ScaleY += e.Delta * 0.002;
count--;
}
}
ViewedPhotoScroll.ScrollToHorizontalOffset(ViewedPhotoScroll.HorizontalOffset);
ViewedPhotoScroll.ScrollToVerticalOffset(ViewedPhotoScroll.VerticalOffset);

but how to do on combobox selection % value do you have any idea.

Richard MacCutchan 11-Dec-17 6:09am

Exactly the same. Take a value from the combobox (whatever you have stored in it) and adjust the scale factor to the required value or percentage.

Member 11859517 11-Dec-17 6:13am

I tried that, but here mouseWheel event handler have e.data but fof combobox selection change will not have e.data.
and how i can pass the value of combobox. here e.Delta * 0.002

Richard MacCutchan 11-Dec-17 8:20am

Create the required object yourself. That is just standard C#, nothing complicated.