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  • javascript AOP statement trace

    - by Paul
    Some javascript libraries, such as JQuery and Dolo, provide AOP APIs that can trace a function. Just wondering whether there is any javascript AOP libraries can trace an individual statement?

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  • physics game programming box2d - orientating a turret-like object using torques

    - by egarcia
    This is a problem I hit when trying to implement a game using the LÖVE engine, which covers box2d with Lua scripting. The objective is simple: A turret-like object (seen from the top, on a 2D environment) needs to orientate itself so it points to a target. The turret is on the x,y coordinates, and the target is on tx, ty. We can consider that x,y are fixed, but tx, ty tend to vary from one instant to the other (i.e. they would be the mouse cursor). The turret has a rotor that can apply a rotational force (torque) on any given moment, clockwise or counter-clockwise. The magnitude of that force has an upper limit called maxTorque. The turret also has certain rotational inertia, which acts for angular movement the same way mass acts for linear movement. There's no friction of any kind, so the turret will keep spinning if it has an angular velocity. The turret has a small AI function that re-evaluates its orientation to verify that it points to the right direction, and activates the rotator. This happens every dt (~60 times per second). It looks like this right now: function Turret:update(dt) local x,y = self:getPositon() local tx,ty = self:getTarget() local maxTorque = self:getMaxTorque() -- max force of the turret rotor local inertia = self:getInertia() -- the rotational inertia local w = self:getAngularVelocity() -- current angular velocity of the turret local angle = self:getAngle() -- the angle the turret is facing currently -- the angle of the like that links the turret center with the target local targetAngle = math.atan2(oy-y,ox-x) local differenceAngle = _normalizeAngle(targetAngle - angle) if(differenceAngle <= math.pi) then -- counter-clockwise is the shortest path self:applyTorque(maxTorque) else -- clockwise is the shortest path self:applyTorque(-maxTorque) end end ... it fails. Let me explain with two illustrative situations: The turret "oscillates" around the targetAngle. If the target is "right behind the turret, just a little clock-wise", the turret will start applying clockwise torques, and keep applying them until the instant in which it surpasses the target angle. At that moment it will start applying torques on the opposite direction. But it will have gained a significant angular velocity, so it will keep going clockwise for some time... until the target will be "just behind, but a bit counter-clockwise". And it will start again. So the turret will oscillate or even go in round circles. I think that my turret should start applying torques in the "opposite direction of the shortest path" before it reaches the target angle (like a car braking before stopping). Intuitively, I think the turret should "start applying torques on the opposite direction of the shortest path when it is about half-way to the target objective". My intuition tells me that it has something to do with the angular velocity. And then there's the fact that the target is mobile - I don't know if I should take that into account somehow or just ignore it. How do I calculate when the turret must "start braking"?

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  • Programming Constructs History

    - by kunjaan
    I need some help in figuring out which language introduced the constructs that we use everyday. For example: Constructs Introduced from LISP If-Else Block :"The ubiquitous if-then-else structure, now taken for granted as an essential element of any programming language, was invented by McCarthy for use in Lisp, where it saw its first appearance in a more general form (the cond structure). It was inherited by Algol, which popularized it. " - WikiPedia Function Type : Functions as first class citizens. Garbage Collection

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  • [Python]Xml add a node from another xml document

    - by michele
    Hi, I have two xml file: 1)model.xml 2)projectionParametersTemplate.xml I want to extract from 1) Algorithm Node with his child and put it in 2) I have wrote this code but it doesn't function. from xml.dom.minidom import Document from xml.dom import minidom xmlmodel=minidom.parse("/home/michele/Scrivania/d/model.xml") xmltemplate=minidom.parse("/home/michele/Scrivania/d/projectionParametersTemplate.xml") for Node in xmlmodel.getElementsByTagName("Algorithm"): print "\nNode: "+str(Node) for Node2 in xmltemplate.getElementsByTagName("ProjectionParameters"): print "\nNode2: "+str(Node2) Node2.appendChild(Node) This is model.xml link text This is projectionParametersTemplate.xml link text Thanks a lot.

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  • Symfony2 impersonation route parameters missing

    - by jaPa
    I receive an error when I change pages if I am impersonated as another user in Symfony2. It only happens when the route has additional parameters. There is no sign of route generation at the pointed line number. Controller action /** * @Route("/member/{id}", name="member_page") * @Template() */ public function memberAction($id) Error An exception has been thrown during the rendering of a template ("Some mandatory parameters are missing ("slug") to generate a URL for route "member_page".") in members.html.twig at line 2.

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  • GUI Application becomes unresponsive while http request is being done

    - by JW
    I have just made my first proper little desktop GUI application that basically wraps a GUI (php-gtk) interface around a SimpleTest Web Test case to make it act as a remote testing client. Each time the local The Web Test case runs, it sends an HTTP request to another SimpleTest case (that has an XHTML interface) sitting on my server. The application, allows me to run one local test that collates information from multiple remote tests. It just has a 'Start Test' button, 'Stop Test' button and a setting to increase/decrease the number of remote tests conducted in each HTTP Request. Each test-run takes about an hour to complete. The trouble is, most of the time the application is making http requests. Furthermore, whenever an HTTP Request is being made, the application's GUI is unresponsive. I have taken to making the application wait a few seconds (iterating through the Gtk::main_iteration ) between requests in order to give the user time to re-size the window, press the Stop button, etc. But, this makes the whole test run take a lot a longer than is necessary. <?php require_once('simpletest/web_tester.php'); class TestRemoteTestingClient extends WebTestCase { function testRunIterations() { ... $this->assertTrue($this->get($nextUrl), 'getting from pointer:'. $this->_remoteMementoPointer); $this->assertResponse(200, "checking response for " . $nextUrl ); $this->assertText('RemoteNodeGreen'); $this->doGtkIterationsForMinNSeconds($secs); ... } public function doGtkIterationsForMinNSeconds($secs) { $this->appendStatusMessage("Waiting " . $secs); $start = time(); $end = $start + $secs; while( (time() < $end) ) { $this->appendStatusMessage("Waiting " . ($end - time())); while(gtk::events_pending()) Gtk::main_iteration(); } } } Is there a way to keep the application responsive whilst, at the same time making an HTTP request? I am considering splitting the application into two, where: Test Controller Application - Acts as a settings-writer / report-reader and this writes to settings file and reads a report file. Test Runner Application - Acts as a settings-reader / report-writer and, for each iteration reads the settings file, Runs the test, then write a report. So to tell it to close down - I'd: Press the Stop Button on the 'Test Controller Application', which writes to the settings file, which is read by the 'Test Runner Application' which stops, then writes to the report file to say it stopped the 'Test Controller Application' reads the report and updates the status and so on... However, before I go ahead and split the application in two - I am wondering if there is any other obvious way to deal with, this issue. I suspect it is probably quite common and a well-trodden path. Also is there an easier way to send messages between two applications?

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  • execute python file from another file

    - by ariel
    Hi I have a python file that has functions and classes. now I am writting another program (in another file). and I want to start the new file with running the old file (with the function and classes). I have tried using exec(path_2_oldFile.pyw) but it didn't work. thanks for any help Ariel

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  • Do WordPress widget (or sidebar) hooks exist?

    - by Jeff
    I'm trying to filter ALL widget output through a simple filter, but can't find any hooks and was hoping to be pointed in the right direction. Or possibly my efforts are not even possible? My simple filter is something like this: function clean_widget_output( $input ) { return str_replace( array( "\t", "\n", "\r" ), '', $input ); } add_[FILTER OR ACTION]( 'need_a_hook', 'clean_widget_output', 99 ); Any ideas? I'm pretty new to PHP, but I can get around.

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  • JQuery and Patial view in MVC

    - by Poomjai
    Belong to this article Jquery Partial View What should i do when i want to submit the value fill from user and sent it to the ActionResult controller that return the partial view -- View Code that call the controller (from article) <script language="JavaScript" type="text/javascript"> $('#centerbody').load('/Custom/CustomAction', function(html) { $('#centerbody')[0].value = html; }); </script> -- Controller Action with no parameter (from article) public ActionResult CustomAction() { return View("_CustomParialView"); } Thanks for your suggestion

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  • Jquery - intercept links clicked inside an iframe

    - by Kaskade
    Hi, I am trying to intercept links clicked on a page including those inside an iframe. This is the code that I have but it is not working. Any ideas what I need to do? $("#container").delegate('a', 'click', function(e){ //do stuff } Container is the id of the div just inside the iframe. Thanks in advance for any advice

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  • NSSet to NSData, then back out again, for GameKit?

    - by Peter Hajas
    Hi guys, I'm trying to do some image edit syncing between two of the same app running on different iPhones. I would like to send an NSSet * from one device to another (which I imagine involves encapsulating in NSData) then decrypting this back to an NSSet, then using it in a touchesMoved type of function. Is this feasible, or should I work on syncing the UIImages instead? I worry that UIImage syncing would have too much latency for realtime interaction. Thanks for your help!

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  • STL: writing "where" operator for a vector.

    - by Arman
    Hello, I need to find the indexes in the vector based on several boolean predicates. ex: vector<float> v; vector<int> idx; idx=where( bool_func1(v), bool_func2(v), ... ); What is the way to declare **where** function, in order to use the several user defined boolean functions over the vector? thanks Arman.

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  • best php config / ini class?

    - by Bala Clark
    Hi, I'm looking for an alternave to the parse_ini_file() function in php. I want a simple way to store config settings, but want the flexibility to store unlimited levels of multiple arrays, special characters, etc. Any ideas?

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  • What IDE should I use to programm CPP on linux

    - by Itay Moav
    I need to start doing CPP (after 12 years) and do it on Ubuntu. What good IDEs are out there? Properties I look for in an IDE: project managment able to build project auto completion object browser+navigation (you click on an object/function name, and the ide sends you to the declaration) Any recommendations?

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  • Passing parameter in C#

    - by Lu Lu
    In C++, I have a function: void MyFunction(int p) { p=5; } Assume, I have: int x = 10; MyFunction(x); // x = 10 MyFunction(&x); // x = 5 How to archive this in C# with condition: I create only one MyFunction. Thanks.

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  • Inverse of COALESCE

    - by ercan
    Hi all, is there a function in SQL Server 2005 that returns NULL if any of the arguments (of any type) is NULL, which would saves me from writing IF a IS NULL OR b IS NULL OR c IS NULL ....

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  • Django - markup parser in template or view?

    - by Amit Ron
    I am building a website where my pages are written in MediaWiki Markup, for which I have a working parser function in Python. Where exactly do I parse my markup: in the view's code, or in the template? My first guess would be something like: return render_to_response( 'blog/post.html', {'post': post, 'content': parseMyMarkup(post.content) }) Is this the usual convention, or should I do something different?

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  • linux usb driver: probing already plugged devices

    - by jacob
    hello, im writing a Usb driver and i have an issue. when i insmod the driver with the device already plugged in before, the probe function is not called. it is only called after i disconnect the device and plug it again. i wanna make it work when i start my pc with the device plugged in. could someone please help me? best regards, jacob.

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