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  • WPF performance for large number of elements on the screen

    - by Mark
    Im currently trying to create a Scene in WPF where I have around 250 controls on my screen and the user can Pan and Zoom in and out of these controls using the mouse. I have run the WPF Performance Suite tools on the application when there are a large number of these controls on the screen (i.e. when the user has zoomed right out) the FPS drops down to around 15 which is not very good. Here is the basic outline of the XAML: <Window> <Window.Resources> <ControlTemplate x:Key="LandTemplate" TargetType="{x:Type local:LandControl}"> <Canvas> <Path Fill="White" Stretch="Fill" Stroke="Black" StrokeThickness="1" Width="55.5" Height="74.687" Data="M0.5,0.5 L55,0.5 L55,74.187 L0.5,74.187 z"/> <Canvas x:Name="DetailLevelCanvas" Width="24.5" Height="21" Canvas.Left="15.306" Canvas.Top="23.972"> <TextBlock Width="21" Height="14" Text="712" TextWrapping="Wrap" Foreground="Black"/> <TextBlock Width="17.5" Height="7" Canvas.Left="7" Canvas.Top="14" Text="614m2" TextWrapping="Wrap" FontSize="5.333" Foreground="Black"/> </Canvas> </Canvas> </ControlTemplate> </Window.Resources> ... <local:LandControl Width="55.5" Height="74.552" Canvas.Top="xxx" Template=" {StaticResource LandTemplate}" RenderTransformOrigin="0.5,0.5" Canvas.Left="xxx"> <local:LandControl Width="55.5" Height="74.552" Canvas.Top="xxx" Template=" {StaticResource LandTemplate}" RenderTransformOrigin="0.5,0.5" Canvas.Left="xxx"> <local:LandControl Width="55.5" Height="74.552" Canvas.Top="xxx" Template=" {StaticResource LandTemplate}" RenderTransformOrigin="0.5,0.5" Canvas.Left="xxx"> <local:LandControl Width="55.5" Height="74.552" Canvas.Top="xxx" Template=" {StaticResource LandTemplate}" RenderTransformOrigin="0.5,0.5" Canvas.Left="xxx"> ... and so on... </Window> Ive tried to minimise the details in the control template and I even did a massive find and replace of the controls to just put their raw elements inline instead of using a template, but with no noticeable performance improvements. I have seen other SO questions about this and people say to do custom drawing, but I dont really see how that make sense when you have to zoom and pan like I do. If anyone can help out here, that would be great! Mark

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  • Windows Build System: How to build a project (from its source code) which doesn't have *.sln or Visu

    - by claws
    I'm facing this problem. So, I need to build the support libraries (zlib, libtiff, libpng, libxml2, libiconv) with "Multithreaded DLL" (/MD) & "Multithreaded DLL Debug" (/MDd) run-time options. But the problem is there is no direct way . I mean there is no *.sln / *.vcproj file which I can open in Visual C++ and build it. I'm aware with the GNU build system: $./configure --with-all-sorts-of-required-switches $./make $./make install During my search I've encountered with something called CMake which generates *.vcproj & *.sln file but for that CMakeLists.txt is required. Not all projects provide CMakeLists.txt. I've never compiled anything from Visual C++ Command Line. Generally most projects provide makefile. Now how do I generate *.vcproj / *.sln from this? Can I compile with mingw-make of MinGW? If I can, how do I set different options ("Multi-Threaded"(/MT), "Multi-Threaded Debug"(/MTd), "Multi-Threaded DLL"(/MD), "Multi-Threaded DLL Debug"(/MDd)) for run-time libraries? I don't know what other ways are available. Please throw some light on this.

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  • nHibernate query looking for the related object's related object

    - by code-zoop
    I have an nHibernate querie issue that looks quite straight forward, but I can't seem to get my head around it! I am creating some simple example classes to illustrate my problem: public class Car { public int Id { get; set; } public IList<Interior> InteriorParts { get; set; } } public class Interior { public int Id { get; set; } public InteriorProducer Producer { get; set; } } public class InteriorProducer { public int Id { get; set; } } Now to the query: I have the id of the InteriorProducer, but need to get a list of Cars where the interior have been produced by the interior producer. So in a simple, pseudo SQL, it looks something like this: select cars where car.InteriorParts.Producer.Id = Id I have a really hard time getting my head around this to create an nHibernate query. Any Ideas? Thanks

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  • Using XSLT to Find Nodes Given a Set of Parameters

    - by davecardwell
    Sorry about the title—wasn’t sure how to word it. Basically I have some XML like this: <countries> <country handle="bangladesh"/> <country handle="india"/> <country handle="pakistan"/> </countries> And some XSLT like this (which doesn’t work): <xsl:template match="/countries"> <xsl:param name="popular"/> <xsl:apply-templates select="country[count($popular/country[@handle = current()/@handle]) &gt; 0]" /> </xsl:template> <xsl:template match="/countries/country"> … </xsl:template> I want to pass in a list of popular destinations like this: <popular> <country handle="india"/> <country handle="pakistan"/> </popular> …to the /countries template and have it only operate on the ones in the $popular param. At the moment this simply does nothing. Changing the selector to country[true()] operates on them all, so at least I know the basic structure is right. Any ideas? I think I may be getting confused by what is currently “current()”.

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  • Is there a way that I can hard code a const XmlNameTable to be reused by all of my XmlTextReader(s)?

    - by highone
    Before I continue I would just like to say I know that "Premature optimization is the root of all evil." However this program is only a hobby project and I enjoy trying to find ways to optimize it. That being said, I was reading an article on improving xml performance and it recommended sharing "the XmlNameTable class that is used to store element and attribute names across multiple XML documents of the same type to improve performance." I wasn't able to find any information about doing this in my googling, so it is likely that this is either not possible, a no-no, or a stupid question, but what's the harm in asking?

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  • Is it a good idea to "migrate business logic code into our domain model"?

    - by Bytecode Ninja
    I am reading Hibernate in Action and the author suggests to move business logic into our domain models (p. 306). For instance, in the example presented by the book, we have three entities named Item, Bid, and User and the author suggests to add a placeBid(User bidder, BigDecimal amount) method to the Item class. Considering that usually we have a distinct layer for business logic (e.g. Manager or Service classes in Spring) that among other things control transactions, etc. is this really a good advice? Isn't it better not to add business logic methods to our entities? Thanks in advance.

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  • What makes this "declarator invalid"? C++

    - by nieldw
    I have Vertex template in vertex.h. From my graph.h: 20 template<class edgeDecor, class vertexDecor, bool dir> 21 class Vertex; which I use in my Graph template. I've used the Vertex template successfully throughout my Graph, return pointers to Vertices, etc. Now for the first time I am trying to declare and instantiate a Vertex object, and gcc is telling me that my 'declarator' is 'invalid'. How can this be? 81 template<class edgeDecor, class vertexDecor, bool dir> 82 Graph<edgeDecor,int,dir> Graph<edgeDecor,vertexDecor,dir>::Dijkstra(vertex s, bool print = false) const 83 { 84 /* Construct new Graph with apropriate decorators */ 85 Graph<edgeDecor,int,dir> span = new Graph<edgeDecor,int,dir>(); 86 span.E.reserve(this->E.size()); 87 88 typename Vertex<edgeDecor,int,dir> v = new Vertex(INT_MAX); 89 span.V = new vector<Vertex<edgeDecor,int,dir> >(this->V.size,v); 90 }; And gcc is saying: graph.h: In member function ‘Graph<edgeDecor, int, dir> Graph<edgeDecor, vertexDecor, dir>::Dijkstra(Vertex<edgeDecor, vertexDecor, dir>, bool) const’: graph.h:88: error: invalid declarator before ‘v’ graph.h:89: error: ‘v’ was not declared in this scope I know this is probably another noob question, but I'll appreciate any help.

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  • How do I code a comment box on my blog?

    - by Malcolm
    Obviously, I am a novice web designer. I'm using php and sql to do all the under-the-hood stuff, but I want a visually appealing as well as functional comment system. Right now I am just using HTML forms but they don't look very good. Should I be using javascript? Any tips to get me started?

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  • JSON: How do I alert the name of the first node in level 1 in this code snippet?

    - by user143805
    var response = "{\"tree\":[{\"level1\":[{\"node\":{\"id\": 1,\"name\": \"paradox\",\"parent\": 0}}]},{\"level2\":[{\"node\":{\"id\": 2,\"name\": \"lucent\",\"parent\": 1}},{\"node\":{\"id\": 3,\"name\": \"reiso\",\"parent\": 1}}]},{\"level3\":[{\"node\":{\"id\": 4,\"name\": \"pessi\",\"parent\": 3}},{\"node\":{\"id\": 5,\"name\": \"misho\",\"parent\": 2}}]},{\"level4\":[{\"node\":{\"id\": 6,\"name\": \"hema\",\"parent\": 5}},{\"node\":{\"id\": 7,\"name\": \"iiyo\",\"parent\": 4}}]}]}"; var data = eval("(" + response + ")"); This is a dummy json response I am currently testing. Now how do I get the value of "name" in the 1st node of "level1" from the "tree"? Thanks

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  • Why doesn't this code using the ruby-mbox gem parse mbox files?

    - by cartoonfox
    I installed ruby-mbox by doing gem install ruby-mbox Running this: #!/usr/bin/ruby require 'rubygems' require 'mbox' m = IO.read('test.eml') puts m.size m = Mbox.new(m) puts m produces this: 71309505 /Library/Ruby/Gems/1.8/gems/ruby-mbox-0.0.2/lib/mbox/mbox.rb:45:in `initialize': uninitialized constant Mbox::StringIO (NameError) from r.rb:7:in `new' from r.rb:7 I have proved that "m" is assigned a string containing the contents of the file, just before Mbox.new(m) is called. It looks as though the Mbox::StringIO should have been defined by hasn't been. What's going wrong here? Ruby version: ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0] (That's the default ruby installed on OS X 10.6.6)

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  • Parse URLs of major video streaming sites and generate appropriate code for embedding.

    - by Markus Lux
    Posting a video on tumblr.com allows you to just paste the URL of the video on youtube, vimeo, whatever and tumblr automatically does the embedding for you. I assume that this would be nothing more than a mapping between an URL-regex and the belonging HTML construct for embedding the video. Or it is just parsing the response of the URL and getting the construct from there. Is there already any utility, preferably in Java, for doing this? If not, how would you do it?

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  • Using KnockoutJs templates with jQuery

    - by balteo
    I would like to end up with the following HTML in the DOM using jQuery and KnockoutJs templates: <div class="messageToAndFromOtherMember" id="13"> <span>the message</span> <span>2012-12-02 14:05:45.0</span> </div> I have started writing my KO template as follows: <div class="messageToAndFromOtherMember" data-bind="attr:{ id: messageId}"> <span data-bind="text: message"></span> <span data-bind="text: sendDateFmted"></span> </div> Upon a successful ajax request, the following js is executed: var messageViewModel = { message: response.message, sendDateFmted: response.sendDateFmted, messageId: response.messageId }; ko.applyBindings(messageViewModel); Now I am not sure how and where to actually do the binding: since my message does not exist before the ajax request is complete and I can have as several messages... Can anyone please suggest a solution? EDIT: I have added this to the html page: <div data-bind="template: { name: 'message-template', data: messageViewModel }"></div> I now get the following js error: Uncaught Error: Unable to parse bindings. Message: ReferenceError: $messageViewModel is not defined; Bindings value: template: { name: 'message-template', data: messageViewModel }

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  • XML, XPATH adding values

    - by user575373
    hello, i have XML files which contain records with the following structure: <payment contractType="1"> <income type="0"> <gr code="1" amount="1506.00"/> <gr code="4" amount="35.00"/> <gr code="10" amount="288.14"/> <de code="3011300" amount="138.72"/> <de code="3081100" amount="48.81"/> <de code="3082400" amount="109.84"/> </income> <netAmount1 value="765.00"/> <netAmount2 value="765.00"/> </payment> each file has many records of type payment and i want the final xml to contain one payment record by adding all the amount values for every differrent code value I think XPath can be used for this, but I never used it before , could someone show me some Java (or else) code for this?

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  • Overriding Page class constructor in ASP.NET code-behind file -- when is it called?

    - by CSharp Noob
    If I override the System.Web.UI.Page constructor, as shown, when does DoSomething() get called in terms of the page lifecycle? I can't seem to find this documented anywhere. namespace NameSpace1 { public partial class MyClass : System.Web.UI.Page { public MyClass() { DoSomething(); } protected void Page_Load(object sender, EventArgs e) { } } } For reference, here is the ASP.NET Page Lifecycle Overview: http://msdn.microsoft.com/en-us/library/ms178472.aspx Turns out the best answer was right in the MSDN article. I just had to look carefully at the diagram.

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  • can these templates be made unambiguous

    - by R Samuel Klatchko
    I'm trying to create a set of overloaded templates for arrays/pointers where one template will be used when the compiler knows the size of the array and the other template will be used when it doesn't: template <typename T, size_t SZ> void moo(T (&arr)[SZ]) { ... } template <typename T> void moo(T *ptr) { ... } The problem is that when the compiler knows the size of the array, the overloads are ambiguous and the compile fails. Is there some way to resolve the ambiguity (perhaps via SFINAE) or is this just not possible.

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  • got a question about Linked-List in java code.

    - by glacier89
    Linked-List: Mirror Consider the following private class for a node of a singly-linked list of integers: private class Node{ public int value; public Node next; } A wrapper-class, called, ListImpl, contains a pointer, called start to the first node of a linked list of Node. Write an instance-method for ListImpl with the signature: public void mirror(); That makes a reversed copy of the linked-list pointed to by start and appends that copy to the end of the list. So, for example the list: start 1 2 3 after a call to mirror, becomes: start 1 2 3 3 2 1 Note: in your answer you do not need to dene the rest of the class for ListImpl just the mirror method.

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  • How to transform a cached XML via XSL?

    - by TruMan1
    I have a PHP script that caches a remote XML file. I want to XSL transform it before caching, but don't know how to do this: <?php // Set this to your link Id $linkId = "0oiy8Plr697u3puyJy9VTUWfPrCEvEgJR"; // Set this to a directory that has write permissions // for this script $cacheDir = "temp/"; $cachetime = 15 * 60; // 15 minutes // Do not change anything below this line // unless you are absolutely sure $feedUrl="http://mydomain.com/messageService/guestlinkservlet?glId="; $cachefile = $cacheDir .$linkId.".xml"; header('Content-type: text/xml'); // Send from the cache if $cachetime is not exceeded if (file_exists($cachefile) && (time() - $cachetime < filemtime($cachefile))) { include($cachefile); echo "<!-- Cached ".date('jS F Y H:i', filemtime($cachefile))." -->\n"; exit; } $contents = file_get_contents($feedUrl . $linkId); // show the contents of the XML file echo $contents; // write it to the cache $fp = fopen($cachefile, 'w'); fwrite($fp, $contents); fclose($fp); ?> This is the XSL string I want to use to transform it: <xsl:template match="/"> <kml xmlns="http://www.opengis.net/kml/2.2"> <Document> <xsl:apply-templates select="messageList" /> </Document> </kml> </xsl:template> <xsl:template match="messageList"> <name>My Generated KML</name> <xsl:apply-templates select="message" /> </xsl:template> <xsl:template match="message"> <Placemark> <name><xsl:value-of select="esnName" /></name> <Point> <coordinates> <xsl:value-of select="latitude" />,<xsl:value-of select="longitude" /> </coordinates> </Point> </Placemark> </xsl:template> I want to actually transform XML input and save/return a KML format. Can someone please help adjust this script? This was given to me and I am a little new to it.

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