Re: Gaussian Blur Effect - WPF Discussion Boards

9-Jun-09 22:24

See - I knew there was a smarter answer....

Gaussian Blur Effect

Etienne_1239-Jun-09 6:50

Etienne_123

9-Jun-09 6:50

Hi
I have a startup form in my app. When this form loads the main form in the background is blurred out using a BitmapEffect and a timer. The timer is used to increment the blur radius in every timer tick, and then un-blur the screen again using another timer.
What I want to know is, is there a better way of gradually blurring the form in the background without using a timer each time?

Below is a sample of the code I'm using.

void blurTimer_Tick(object sender, EventArgs e)
        {
            if (blurTimerCount != 10)
            {
                BlurBitmapEffect blurEffect = new BlurBitmapEffect();
                
                blurEffect.Radius = blurTimerCount;
                blurEffect.KernelType = KernelType.Box;

                mainWindow.BitmapEffect = blurEffect;

                blurTimerCount++;
            }
            if (blurTimerCount == 10)
            {
                blurTimer.Stop();
            }
        }

#realJSOP9-Jun-09 9:03

9-Jun-09 9:03

Setup a storyboard somehow, and "animate" it?

I was thinking about trying that myself.

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
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Christian Graus9-Jun-09 10:51

9-Jun-09 10:51

Etienne_123 wrote:
blurEffect.Radius = blurTimerCount;

This looks like the property you could just animate in a timeline in XAML, to me.

Pete O'Hanlon9-Jun-09 23:06

Pete O'Hanlon

9-Jun-09 23:06

This is actually quite trivial. Here's a sample:

<Window 
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Window.BitmapEffect>
    <BlurBitmapEffect x:Name="blurTarget" KernelType="Gaussian" Radius="0"/>
  </Window.BitmapEffect>
  <Window.Triggers>
    <EventTrigger RoutedEvent="Window.Loaded">
      <BeginStoryboard>
        <Storyboard>
          <DoubleAnimation
            Duration="0: 0:10"
            From="0.0"
            Storyboard.TargetName="blurTarget"
            Storyboard.TargetProperty="Radius"
            To="40.0"/>
        </Storyboard>
      </BeginStoryboard>
    </EventTrigger>
  </Window.Triggers>
  <Grid>
    <Button Content="This Is my button" />
  </Grid>
</Window>

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

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Etienne_12310-Jun-09 3:49

Etienne_123

10-Jun-09 3:49

Thanks guys, I got it working.

I just declared 2 new storyboards in my xaml (one for blurring and another for unblurring), then I just used the following in the code behind to start the storyboards:

Storyboard storyBlur = this.FindResource("blurMainWindow") as Storyboard;
storyBlur.Begin();

#realJSOP10-Jun-09 8:12

NavigationEventArgs.Uri and LoadCompleted event

10-Jun-09 8:12

I tried this:

<BlurEffect x:Name="blurTarget" Radius="12" KernelType="Gaussian" />
<Storyboard x:Key="AnimateUnblur">
    <DoubleAnimation From="12" To="0" Duration="0:0:1"
                        Storyboard.TargetName="blurTarget"
                        Storyboard.TargetProperty="Radius" />
</Storyboard>

and then tried this:

BlurEffect blur = (BlurEffect)FindResource("blurTarget");
this.Effect     = blur;

And it's throwing an exception because it can't find the resource "blurTarget".

Gary Wheeler9-Jun-09 5:32

Gary Wheeler

9-Jun-09 5:32

I'm using page navigation, with pack URI's specified like this:

Uri uri = new Uri(@"/DetailAssembly;component/Detail.xaml",UriKind.Relative);
frame.Navigate(uri);

In the LoadCompleted handler, I see the following:

public void _DetailLoadCompleted(Object sender,NavigationEventArgs e)
{
  // e.Uri.ToString() == e.Uri.OriginalString() ==
  // "DetailAssembly;component/Detail.xaml"
}

Somewhere along the line, someone removed the leading '/' character from the relative URI.

I know this is a picayune little detail, but does anyone know why they would do this? I thought maybe there was something I'm not understanding about URI's in WPF, but I can't find anything on MSDN or in my books. My basic conclusion is that it's just a bug. Can anyone offer any other explanation?

Software Zen: delete this;

Copy Paste event handler at design time

Vinod C S9-Jun-09 5:20

Vinod C S

9-Jun-09 5:20

Hi,
I am writing WPF custom control. My problem is I want to do some updations in the control when the control is being creted by copy paste( CTRL+C, CTRL+V) on the cider.
How can I track this event or attch an handler to this event.
Does ApplicationCommand.copy.... make any sense here.
Please help.

Thanks in Advance,
Vinod

Re: Copy Paste event handler at design time

Christian Graus9-Jun-09 10:53

Re: Copy Paste event handler at design time

9-Jun-09 10:53

You mean when it gets added to a form in the designer ? I'm not sure how you write event code in your control, for an event that fires in another program, but I suspect if it can be done, it will be an actual event that's called by the IDE, OR the constructor is called and you can write a block of code that detects if you're in the designer ( this can be done in Winforms, for sure )

User 27100910-Jun-09 5:07

User 271009

10-Jun-09 5:07

You'll need to write a designer for your control. This is not trival.

You can search for WPF control designer for examples.

There is also documentation on MDSN.

Cheers, Karl

» CodeProject 2008 MVP, CodeProject 2009 MVP

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Just a grain of sand on the worlds beaches.

modified 27-Feb-21 21:01pm.

How to display canvas thumbnails.

Nekkantidivya8-Jun-09 21:23

Nekkantidivya

8-Jun-09 21:23

Hi,

I am working on a WPF application. In this we will change the position of the components on the canvas. Every time we change the positions of the components on the canvas, we have to display a thumbnails of the canvas.

I have a procedure to create the images of the canvas.

http://blogs.msdn.com/saveenr/archive/2008/09/18/wpf-xaml-saving-a-window-or-canvas-as-a-png-bitmap.aspx

Now I have to display the images of the thumbnail as canvas dynamically as thumbnails.

If anyone have any idea to solve this please reply me.

Thanks in Advance

Re: How to display canvas thumbnails.

Pete O'Hanlon8-Jun-09 23:08

Pete O'Hanlon

8-Jun-09 23:08

You might want to use a variation of this[^].

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Problem in showing an image in WPF

paradisonoir8-Jun-09 14:18

paradisonoir

8-Jun-09 14:18

Hi,

In WPF, I can set Image with a photo, and can see when I load the page. However, if I want to set that through a code-behind, I cannot. Here is my code, do you find anything wrong in it that might cause this problem? I checked on compile time, and there is no problem in the location of myPhoto.png.

>  string location = @"C:\myPhoto.png";
 
> Uri uri= new Uri(location,> UriKind.Relative);
  
> ImageSource imgSource = new BitmapImage(uri); 

> Icons.Source = imgSource;  

> Icons.Width = 10;  

>Icons.Height = 10; 

> Icons.Visibility = Visibility.Visible;

thanks,

Mark Salsbery8-Jun-09 14:49

Mark Salsbery

8-Jun-09 14:49

Maybe try

C:/myPhoto.png

Or

File://C:/myPhoto.png

The UriKind should be Absolute as well.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

#realJSOP8-Jun-09 23:36

8-Jun-09 23:36

Mark Salsbery wrote:
The UriKind should be Absolute as well.

When I made that mistake, I remember getting a compiler error. I was using "/AssemblyName;component/Images/filename.png", and still had to use Absolute.

Mark Salsbery9-Jun-09 5:43

Mark Salsbery

9-Jun-09 5:43

That's an absolute address though, isn't it?

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

#realJSOP9-Jun-09 9:01

9-Jun-09 9:01

I wouldn't think so. I would think an absolute address would be a fully qualified path, and the one I use would be relative to the named assembly.

I guess it's a matter of perception.

Christian Graus8-Jun-09 16:13

8-Jun-09 16:13

paradisonoir wrote:
> string location = @"C:\myPhoto.png";

> Uri uri= new Uri(location,> UriKind.Relative);

That's an absolute path, not a relative one.

Mark Salsbery9-Jun-09 5:43

Mark Salsbery

9-Jun-09 5:43

Hey! I'm working this side of the street Smile | :)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Christian Graus9-Jun-09 10:53