Manipulating a PNG palette - WPF Discussion Boards

You can use your user controls just like any other UI element.

What part are you having trouble with?

I'm not sure why your topic mentions converting XAML to PNG.....that certainly
has nothing to do with the example link you provided.

Mark

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

I am thankful to your answer.
Actually, I want to create silverligt application same as mentioned in the above link which I had given. In that link When I see the view source then I find that they have used .png files.

Please advice me how to create/steps to silverligt application same as which I had mentioned.

There are two steps to take any part of the page and convert to a PNG.

First, get it into a bitmap. That's simple enough. Let's say your page looks like this:

<grid x:Name="mainGrid">
 <component1/>
 <component2>
   <nestedcomponent3/>
 </component2>
</grid>

To get this to a bitmap, just do an empty transform on the grid;

WriteableBitmap bitmap = new WriteableBitmap(mainGrid, new TranslateTransform());

Now you've got your bitmap (you can do an Image.source = bitmap for example and show it)

Next, getting it to a PNG - that's a little more complicated, but also has been addressed with some libraries, like this one:

http://blogs.msdn.com/jstegman/archive/2008/04/21/dynamic-image-generation-in-silverlight.aspx[^]

Best of success!

Jeremy Likness
Latest Article: Hierarchal Data Templates in Silverlight
Blog:
http://csharperimage.jeremylikness.com/

Hi,
I need to develop a WPF application using photoshop file.
I tried importing using blend , but it creates a Image control and loads the png image for the layers, is there any better option to use the psd file for developing WPF screens.

Thanks

You need a PSD to XAML converter, like 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

Thanks for the reply, but the link i snot working can u pls provide me the active link or if u have the exe can u pls share me.

I only used an old version a while back - I don't have a copy I'm afraid, and it seems to have been discontinued (which is a shame). Do you have Fireworks installed? If so, you can import your PSD into that, and use the Fireworks XAML exporter[^] from Infragistics.

"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

We want to make it easy for the customer to adjust PNG-8 icons and controls, for a web-based app to match his own branding and color themes. Since PNG-8 uses a palette (ie, indexed colors) all I want to do is read in a PNG file, fiddle with the palette and write it out again. I can do this in any environment but Microsoft. How do we do it in Microsoft? (VS2008, .Net 3.5, WPF)

Just as a test I tried reading it a PNG-8 file, creating a screwy palette, and displaying it, but it didn't do a thing - the original image displayed perfectly:

Stream imageStreamSource = new FileStream(sPath, FileMode.Open, FileAccess.Read, FileShare.Read);
 PngBitmapDecoder decoder = new PngBitmapDecoder(imageStreamSource, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
 BitmapSource OriginalImage = decoder.Frames[0];

 FormatConvertedBitmap newFormatedBitmapSource = new FormatConvertedBitmap();

 newFormatedBitmapSource.BeginInit();
 newFormatedBitmapSource.DestinationFormat = PixelFormats.Indexed8;
 newFormatedBitmapSource.Source = OriginalImage;

 // make a silly palette . . .
 List<System.Windows.Media.Color> colors = new List<System.Windows.Media.Color>();
 for (int i = 0; i < 127; i++)
 {
     colors.Add(System.Windows.Media.Colors.Red);
     colors.Add(System.Windows.Media.Colors.Blue);
 }
 BitmapPalette myPalette = new BitmapPalette(colors);

 newFormatedBitmapSource.DestinationPalette = myPalette;

 newFormatedBitmapSource.EndInit();

 // Draw the Image
 image1.Source = newFormatedBitmapSource;

On the MSDN it says "Only Tagged Image File Format (TIFF) and Graphics Interchange Format (GIF) image formats support image palettes. However, other image types can be used to define a BitmapPalette. Attempting to define a BitmapPalette for an unsupported bitmap format does not result in an exception; the designated BitmapPalette is simply ignored. "

. . . so maybe that's what I'm seeing, but then what IS the way to manipulate PNG palettes?

Thanks in advance.

As far as I know, there's no support for encoding 8bpp PNG in either
the WPF imaging classes or GDI+ (System.Drawing). You'll probably need
a third-party encoder or roll your own.

Mark

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

I don't mind rolling my own - I've written image-processing libraries in C++ using DirectX in the past.

But all the third-party libraries I've found are implemented OUTSIDE of .Net and just use C# wrappers for use in .Net. This makes me skeptical whether .Net is suitable for writing a graphics format class.

Does .Net provide enough fast, efficient rendering primitives to implement a good graphics library? Or does it make more sense to write a converter to/from some format .Net already knows about, like .BMP?

In other words, what it the correct "dot net" way to implement a class for a format that Microsoft doesn't support?

Or should I forget about .Net for this altogether?

Hi,

I have 3 different uploads from client to server, I want to show 3 different Progress bars for 3 uploads.
Finally I want to show one final progress bar showing the status of above uploads collectively.

Does that mean I have to use 4 background workers?
I am totally lost here. All the background worker examples show only one progress bar.

If anyone find an example with multiple progress bars, please send me the link.

Any clue or help will be appreciated,

Is this for a WPF app?

"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

Welllll, setup three BackgroundWorkers - one for each progressbar.

"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
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Thanks for your quick replies,

I am posting my code. This code is in code behind of WPF window. UI has four ProgressBars which I have to update.

public static List<photopost> allPhotosToUpload = null;

private BackgroundWorker serviceValuesWorker = null;
private BackgroundWorker signatureWorker = null;
private BackgroundWorker photoWorker = null;
private BackgroundWorker mainWorker = null;

public UploadProgressWithfourBars()
{
InitializeComponent();
UploadServiceValuesPhotosAndSignature();
}
private void UploadServiceValuesPhotosAndSignature()
{
bool finalSuccessMessage = false;
var context = new VersentiaMobileDataContext();
var serviceInstances = ServiceInstancesDataAccess.GetAll(context);
bool[] allResponses;
List<signature> signatures = null;

foreach (var serviceInstance in serviceInstances)
{
//Get All Signatures
var serviceValues = serviceInstance.ServiceValues.Where(sv => sv.ServiceProperty.Datatype == "Signature").Select(sv =>sv);
signatures = serviceValues.Select(sv => sv.Signature).Distinct().ToList();

//Get All Photos
allPhotosToUpload = PostPhotoCollection.GetPhotos(serviceInstance, context);
int count = allPhotosToUpload.Count + signatures.Count + 1;
allResponses = new bool[count];

int i = 0;

//Upload serviceValues
serviceValuesWorker = new BackgroundWorker();
serviceValuesWorker.WorkerReportsProgress = true;
serviceValuesWorker.WorkerSupportsCancellation = true;

serviceValuesWorker.DoWork += delegate(object s, DoWorkEventArgs args)
{
serviceValuesWorker.ReportProgress(10);
if (serviceValuesWorker.CancellationPending)
{
args.Cancel = true;
return;
}
serviceValuesWorker.ReportProgress(50);
var serializableValues = serviceInstance.ServiceValues.AsSerializable();
var serialisedValues = new Dictionary<string, object[]=""> { { "ValuesInfo", serializableValues } }.Serialize();
string responseFromServer = ServiceRequest.GetResponse("UpdateServiceInstanceMobile", "ServiceInstances", serialisedValues, serviceInstance.ServiceInstanceID.ToString());
var response = responseFromServer.Deserialize<<dictionary>string, object>>();
bool successServiceValues = (bool)response["success"];
if (successServiceValues)
{
serviceValuesWorker.ReportProgress(100);
}
args.Result = successServiceValues;
};
serviceValuesWorker.ProgressChanged += delegate(object s, ProgressChangedEventArgs args)
{
serviceValuesProgressBar.Value = args.ProgressPercentage;
};
serviceValuesWorker.RunWorkerCompleted += delegate(object s, RunWorkerCompletedEventArgs args)
{
try
{
allResponses[i++] = (bool) args.Result;

}
catch (Exception)
{
}
};
serviceValuesWorker.RunWorkerAsync();

//Upload Signatures
signatureWorker = new BackgroundWorker();
signatureWorker.WorkerReportsProgress = true;
signatureWorker.WorkerSupportsCancellation = true;

signatureWorker.DoWork += delegate(object s, DoWorkEventArgs args)
{
signatureWorker.ReportProgress(10);
if (signatureWorker.CancellationPending)
{
args.Cancel = true;
return;
}
signatureWorker.ReportProgress(50);
bool[] responseArray = new bool[signatures.Count];
int j = 0;
foreach (var signature in signatures)
{
string serviceValuesString = "";
var serviceValuesIDs = serviceValues.Where(sv => sv.SignatureID == signature.SignatureID).Select(sv => sv.ServiceValueID).ToList();
foreach (var ID in serviceValuesIDs)
{
if (ID != serviceValuesIDs.Last())
{
serviceValuesString = serviceValuesString + ID + ",";
}
else
{
serviceValuesString = serviceValuesString + ID;
}
string signaturePath = signature.SignaturePath;
byte[] signatureByteArray = SignatureFileConversion.SignatureFileToByteArray(signaturePath);
string signatureToUpload = signatureByteArray.Serialize();
var signatureResponseFromServer = ServiceRequest.GetSignatureResponse("AddSignature", "ServiceInstances", serviceValuesString, serviceInstance.ServiceInstanceID.ToString(), signatureToUpload);
var signatureResponse = signatureResponseFromServer.Deserialize<<dictionary>string, object>>();
responseArray[j++] = (bool)signatureResponse["success"];
}
}
if(!responseArray.Contains(false))
{
signatureWorker.ReportProgress(100);
}
args.Result = responseArray;
};
signatureWorker.ProgressChanged += delegate(object s, ProgressChangedEventArgs args)
{
signatureProgressBar.Value = args.ProgressPercentage;
};
signatureWorker.RunWorkerCompleted += delegate(object s, RunWorkerCompletedEventArgs args)
{
try
{
bool[] signatureResponses = (bool[]) args.Result;
foreach (var response in signatureResponses)
{
allResponses[i++] = response;
}

}
catch (Exception)
{
}
};
signatureWorker.RunWorkerAsync();

//Upload Photos
photoWorker = new BackgroundWorker();
photoWorker.WorkerReportsProgress = true;
photoWorker.WorkerSupportsCancellation = true;

photoWorker.DoWork += delegate(object s, DoWorkEventArgs args)
{
photoWorker.ReportProgress(10);
if (photoWorker.CancellationPending)
{
args.Cancel = true;
return;
}
photoWorker.ReportProgress(50);
bool[] photoResponseArray = new bool[allPhotosToUpload.Count];
int k = 0;
foreach (var photo in allPhotosToUpload)
{
photoResponseArray[k++] = PostPhotoCollection.SendPhoto(photo);
}
if(!photoResponseArray.Contains(false))
{
photoWorker.ReportProgress(100);
}
args.Result = photoResponseArray;
};
photoWorker.ProgressChanged += delegate(object s, ProgressChangedEventArgs args)
{
serviceValuesProgressBar.Value = args.ProgressPercentage;
};
photoWorker.RunWorkerCompleted += delegate(object s, RunWorkerCompletedEventArgs args)
{
try
{
bool[] photoResponses = (bool[]) args.Result;
foreach (var response in photoResponses)
{
allResponses[i++] = response;
}

}
catch (Exception)
{
}
};
photoWorker.RunWorkerAsync();

mainWorker = new BackgroundWorker();
mainWorker.WorkerReportsProgress = true;
mainWorker.WorkerSupportsCancellation = true;

mainWorker.DoWork += delegate(object s, DoWorkEventArgs args)
{
mainWorker.ReportProgress(10);
if (mainWorker.CancellationPending)
{
args.Cancel = true;
return;
}
mainWorker.ReportProgress(50);
if (!allResponses.Contains(false))
{
bool IsDone = true;
string finalResponseFromServer = ServiceRequest.GetFinalResponse("SubmitChanges", "ServiceInstances", IsDone.ToString(), serviceInstance.ServiceInstanceID.ToString(), allPhotosToUpload.Count.ToString(), signatures.Count().ToString());
var finalResponse = finalResponseFromServer.Deserialize<<dictionary>string, object>();
finalSuccessMessage = (bool)finalResponse["success"];
args.Result = finalSuccessMessage;
if (finalSuccessMessage)
{
mainWorker.ReportProgress(100);
}
}
};
mainWorker.ProgressChanged += delegate(object s, ProgressChangedEventArgs args)
{
mainProgressBar.Value = args.ProgressPercentage;
};
mainWorker.RunWorkerCompleted += delegate(object s, RunWorkerCompletedEventArgs args)
{
try
{
if((bool) args.Result)
{
btnClose.IsEnabled = true;
}

}
catch (Exception)
{
}
};
mainWorker.RunWorkerAsync();

btnCancel.Click += ((o, args) =>
{
serviceValuesWorker.CancelAsync();
serviceValuesProgressBar.Value = 0;
signatureWorker.CancelAsync();
signatureProgressBar.Value = 0;
photoWorker.CancelAsync();
photoProgressBar.Value = 0;
mainWorker.CancelAsync();
mainProgressBar.Value = 0;
bool IsDone = false;
string finalResponseFromServer = ServiceRequest.GetFinalResponse("SubmitChanges", "ServiceInstances", IsDone.ToString(), serviceInstance.ServiceInstanceID.ToString(), allPhotosToUpload.Count.ToString(), signatures.Count().ToString());
var finalResponse = finalResponseFromServer.Deserialize<dictionary<string, object="">>();
finalSuccessMessage = (bool)finalResponse["success"];
if (!finalSuccessMessage)
{
lblUploadCancelled.Visibility = Visibility.Visible;
btnClose.IsEnabled = true;
btnCancel.IsEnabled = false;
}
});
}
}

private void Click_Close(object sender, RoutedEventArgs e)
{
this.Close();
}

I am getting Accessviolation Exception. "allResponses" array is not modifying at all. The same procedure if I do without threads working fine, but no progress indication to the user.

Please help.

Nobody's going to help you until a) your code is properly formatted, and b) you can whittle it down to something that doesn't require more than one scrolled page.

Lastly, this is the WPF/WCF/WWF forum. How is your question related to any of these topics?

"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
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

vsaratkar wrote:
I am getting Accessviolation Exception. "allResponses" array

I'm not going to put much effort into reading that big chunk of unformatted code,
but to start with, it looks like you have multiple threads accessing the "allResponses"
array and the "i" variable with no synchronization.

As for the exception - this should be easy to debug. Either the array is null or you're
trying to write past the end (i.e. the array is not large enough)...

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

I am getting a eroor from my code, i cant trace the issue/bug . here is my code bit...

private void DoArrange()<br />
        {<br />
            Point center = new Point((this.Width - ItemSize) / 2, (this.Height - ItemSize) / 2);<br />
            double radiusX = center.X;<br />
            double radiusY = center.Y;<br />
            double scale = ScalePerspective;<br />
<br />
            for (int i = 0; i &lt; Children.Count; i++)<br />
            {<br />
                UIElement item = Children[i];<br />
                double radians = (double)item.GetValue(CarouselPanel.AngleProperty);<br />
<br />
                Point p = new Point(<br />
                                    (Math.Cos(radians) * radiusX) + center.X,<br />
                                    (Math.Sin(radians) * radiusY) + center.Y<br />
                                   );<br />
<br />
                if (item.RenderTransform == null)<br />
                {<br />
                    item.RenderTransform = new MatrixTransform();<br />
                    item.RenderTransformOrigin = new Point(0.5, 0.5);<br />
                }<br />
                MatrixTransform mt = item.RenderTransform as MatrixTransform;<br />
                double scaleMinusRounding = p.Y / (center.Y + radiusY);<br />
                double scaleX = Math.Min(scaleMinusRounding + scale, 1.0);<br />
                double scaleY = Math.Min(scaleMinusRounding + scale, 1.0);<br />
                Matrix mx = new Matrix(scaleX, 0.0, 0.0, scaleY, 0.0, 0.0);<br />
            <br />
               mt.Matrix = mx;<br />
                item.RenderTransform = mt;<br />
                <br />
                int zIndex = (int)((p.Y / base.Height) * 50);<br />
                item.SetValue(Canvas.ZIndexProperty, zIndex);<br />
                Rect r = new Rect(p.X, p.Y, ItemSize, ItemSize);<br />
                item.Arrange(r);<br />
            }<br />
        }

What could be the issue i am using a WPF(win) application.

modified on Thursday, July 9, 2009 9:48 AM

I can't see the Identity property in your code. Are you sure this is where the problem is?

"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

I edidted the post again,..the error raised from the underlined statement..

Basically, you have a frozen object here (you can tell this by checking mt.Matrix.IsFrozen). Once an object is frozen, you can't modify it - instead, you have to clone it and work with that.

"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

Pete O'Hanlon wrote:
(you can tell this by checking mt.Matrix.IsFrozen).

i cannot find any handle like that, but i found something mt.Matrix.IsIdentity which is returns a bool value. What it does?..

Your corperation is really appreciated!

ASysSolvers wrote:
i cannot find any handle like that, but i found something mt.Matrix.IsIdentity which is returns a bool value. What it does?..

This property identifies whether or not a matrix is the identity matrix. Basically, an identity matrix is a square matrix which has 1s on the main diagonal and 0s elsewhere.

"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

Do you have any idea to modify my code in the correct way?.. im struggled now.. i dont knw,.. i want to use this in WPF(Windows) application,..but fine in web it works,..
In windows it gives runtine error like in Thread subject..

Hello,

Currently im hanging on one Problem. I wrote a class inherting from grid. Each grid has the property
children. How can i get an notification when a new children added to the grid. I need somethink like a
event which occours when the children-cout changed. I hope you understand what i mean.

Thanks in advanced

You're looking at the ObservableCollection - that notifies you when an item has been added or removed from a collection.

"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