CODEWITHSUNDEEP
c#wpfimage
Shashank
Shashank

Reputation: 6337

how to flip Image in wpf

I recently learned how to rotate a BitmapImage using the 'TransformedBitmap' and 'RotateTransformed' classes. Now I am able to perform clockwise rotations on my images. But how do I FLIP an image? I can't find the class(es) to perform horizontal and vertical flips of a BitmapImage. Please help me figure out how to do it. For instance, if my image was a drawing that looked like a 'd', then a vertical flip would result in something like a 'q', and a horizontal flip would result in something like a 'b'.

Upvotes: 54

Views: 54267

Answers (6)

yangs
yangs

Reputation: 76

<Image x:Name="SampleImage"  Margin="0" RenderTransformOrigin="0.5,0.5" >
        <Image.LayoutTransform>
            <TransformGroup>
                <ScaleTransform ScaleY="1" ScaleX="-1"/>
                <SkewTransform AngleY="0" AngleX="0"/>
                <RotateTransform Angle="0"/>
                <TranslateTransform/>
            </TransformGroup>
        </Image.LayoutTransform>
    </Image>

Create an image component like this. And when its source is set, the image will flip from left to right.

Upvotes: 5

George Birbilis
George Birbilis

Reputation: 2930

A quick trick for horizontal (only) flipping btw is to set FlowDirection property to FlowDirection.RightToLeft. If the component is a container though, some children of it may interpret the property differently (custom logic)

Upvotes: 5

mcanti
mcanti

Reputation: 1974

Interesting 3d flippable usercontrol: http://flipcontrol.codeplex.com/releases/view/22358

In your case you will have to display on both sides the same image.

Upvotes: 2

Brad Cunningham
Brad Cunningham

Reputation: 6501

To give your flip a little more "depth" so that is looks more like a true flip you probably want to do a skew transform with a smaller scale transform.

You would want to skew the object about 20 degrees to make it look as if it is flipping in 3D. This is a poor mans 3D flip. You can accomplish a true 3D flip in WPF but that takes a bit more work.

This will give you the animation that looks cleaner, then you can toggle visibility on two different panels to give the impression of a front and a backside to your element.

<DoubleAnimationUsingKeyFrames Storyboard.TargetName="MyControl" Storyboard.TargetProperty="(FrameworkElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)">
  <SplineDoubleKeyFrame KeyTime="00:00:00.0" Value="1" />
  <SplineDoubleKeyFrame KeyTime="00:00:00.09" Value="0.3" />
  <SplineDoubleKeyFrame KeyTime="00:00:00.12" Value="0.6" />                              
  <SplineDoubleKeyFrame KeyTime="00:00:00.15" Value="0.8" />
  <SplineDoubleKeyFrame KeyTime="00:00:00.18" Value="1" />
  <SplineDoubleKeyFrame KeyTime="00:00:00.2" Value="1" />
</DoubleAnimationUsingKeyFrames>

<DoubleAnimationUsingKeyFrames Storyboard.TargetName="MyControl" Storyboard.TargetProperty="(FrameworkElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleY)">
  <SplineDoubleKeyFrame KeyTime="00:00:00.0" Value="1" />
  <SplineDoubleKeyFrame KeyTime="00:00:00.09" Value="0.9" />
  <SplineDoubleKeyFrame KeyTime="00:00:00.18" Value="1" />
  <SplineDoubleKeyFrame KeyTime="00:00:00.2" Value="1" />
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="MyControl" Storyboard.TargetProperty="(FrameworkElement.RenderTransform).(TransformGroup.Children)[1].(SkewTransform.AngleY)">
  <SplineDoubleKeyFrame KeyTime="00:00:00" Value="0" />
  <SplineDoubleKeyFrame KeyTime="00:00:00.06" Value="-10" />
  <SplineDoubleKeyFrame KeyTime="00:00:00.09" Value="-20" />
  <SplineDoubleKeyFrame KeyTime="00:00:00.1" Value="20" />
  <SplineDoubleKeyFrame KeyTime="00:00:00.18" Value="0" />
</DoubleAnimationUsingKeyFrames>

Upvotes: 9

luvieere
luvieere

Reputation: 37494

Use a ScaleTransform with a ScaleX of -1 for horizontal and ScaleY of -1 for vertical flipping, applied to the image's RenderTransform property. Using RenderTransformOrigin="0.5,0.5" on the image makes sure your image gets flipped around its center, so you won't have to apply an additional TranslateTransform to move it into place:

<Image Source="a.jpg" Padding="5" RenderTransformOrigin="0.5,0.5">
  <Image.RenderTransform>
    <ScaleTransform ScaleX="-1"/>
  </Image.RenderTransform>
</Image>

for horizontal flipping and

<Image Source="a.jpg" Padding="5" RenderTransformOrigin="0.5,0.5">
  <Image.RenderTransform>
    <ScaleTransform ScaleY="-1"/>
  </Image.RenderTransform>
</Image>

for vertical.

If you want to do it in code-behind, in C# it should look something like this:

img.RenderTransformOrigin = new Point(0.5,0.5);
ScaleTransform flipTrans = new ScaleTransform();
flipTrans.ScaleX = -1;
//flipTrans.ScaleY = -1;
img.RenderTransform = flipTrans;

Upvotes: 135

Anvaka
Anvaka

Reputation: 15823

You can use ScaleTransform with negative ScaleX/ScaleY:

  <TextBlock Text="P">
   <TextBlock.RenderTransform>
    <ScaleTransform ScaleY="-1" ScaleX="-1" />
   </TextBlock.RenderTransform>
  </TextBlock>

Upvotes: 1

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