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• PHP and Enums

  - by Henrik Paul

  I know that PHP doesn't have native Enumerations. But I have become accustomed to them from the Java world. I would love to use enums as a way to give predefined values which IDEs' auto completion features could understand. Constants do the trick, but there's the namespace collision problem and (or actually because) they're global. Arrays don't have the namespace problem, but they're too vague, they can be overwritten at runtime and IDEs rarely (never?) know how to autofill their keys. Are there any solutions/workarounds you commonly use? Does anyone recall whether the PHP guys have had any thoughts or decisions around enums?

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• Event handling for keyboard strokes

  - by david

  Hey, I'm trying to get familiar with the whole keyboard event detection thing. Here's my sample code. <fx:Script> <![CDATA[ import flash.events.KeyboardEvent; import mx.controls.Alert; private function init():void{ addEventListener(KeyboardEvent.KEY_DOWN,reportKeyDown); } private function reportKeyDown(event:KeyboardEvent):void { Alert.show("a key was pressed"); } ]]> </fx:Script> As you can see, I'm at stage 0 of playing around with it, but it won't work. Anyone has any idea what I should be doing instead? Thanks

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• Scale an image every time it collide with another

  - by jean mayot

  here is my code : -(void)collision{ if(CGRectIntersectsRect(imageView.frame,centre.frame)){ imageView.alpha=0; [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:1.0f]; centre.transform=CGAffineTransformMakeScale(1.3, 1.3); [UIView commitAnimations]; } } When imageView collide with centre centre become bigger. my problem is that when "imageView" collide with "centre" a second time the animation doesn't work. I want to make centre bigger and bigger and bigger every time imageView collide with center, but it become bigger just one time . Sorry for my english I'm french :/ How can I solve this please ?

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• Code snippets in interview

  - by Maddy

  Hi All, Recently I went to an interview for a C development position. Instead of asking me questions, they just gave me 20 code snippets to find out two logical errors on each one. I just couldn't complete all of the 20 since it took me time to go through each of these code snippets. My question is: Is this the right way to judge a candidate? If yes, how can I improve over my error detection skills so that I don't need to waste a lot of time in the next interview? If possible, please, suggest me some links where I could find lots of samples of such questions (mainly in C). Thanks and regards, Maddy

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• Can PMD be customized to fully support a new language?

  - by tinny

  Can PMD be customized to fully support a new language, in a reasonable amount of time. I mean I know that technically almost anything can be done, but im wondering if this can be done in a reasonable amount of time? E.g. < 2 weeks This page mentions how to write a CPD parser http://pmd.sourceforge.net/cpd-parser-howto.html But is this just for copy / paste detection? Does writing a CPD parser give me full support of PMD in terms of rile sets?

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• How to detect VC++ 2008 redistributable?

  - by RobH

  Is there a Registry setting that I can look for to determine whether or not the Visual C++ redistributable is installed, whether standalone or as part of Visual Studio 2008? I know that I could launch the VC++ 2008 redistributable installer and let it handle the detection, but it would look cleaner if I can check for it and not bother launching the installer if the redistributable is already on the system. It's no biggie if there is no setting to search for, as this is just for the preliminary installers that we have for the new version of our software. We won't need it for the new Windows Installer-based installers that we are working on that will replace the old tech ones and will use the merge modules.

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• Implementing tracing gestures on iPhone

  - by bmoeskau

  I'd like to create an iPhone app that supports tracing of arbitrary shapes using your finger (with accuracy detection). I have seen references to an Apple sample app called "GestureMatch" that supposedly implemented exactly that, but it was removed from the SDK at some point and I cannot find the source anywhere via Google. Does anyone know of a current official sample that demonstrates tracing like this? Or any solid suggestions on other resources to look at? I've done some iPhone programming, but not really anything with the graphics API's or custom handling of touch gestures, so I'm not sure where to start.

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• Is it okay to truncate a SHA256 hash to 128 bits?

  - by Sunny Hirai

  MD5 and SHA-1 hashes have weaknesses against collision attacks. SHA256 does not but it outputs 256 bits. Can I safely take the first or last 128 bits and use that as the hash? I know it will be weaker (because it has less bits) but otherwise will it work? Basically I want to use this to uniquely identify files in a file system that might one day contain a trillion files. I'm aware of the birthday problem and a 128 bit hash should yield about a 1 in a trillion chance on a trillion files that there would be two different files with the same hash. I can live with those odds. What I can't live with is if somebody could easily, deliberately, insert a new file with the same hash and the same beginning characters of the file. I believe in MD5 and SHA1 this is possible.

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• How to detect tap on uiview with lots of controls?

  - by kodcu

  My problem is about tap detection. I have a uiviewcontroller and there are some controls on uiview (labels, buttons, tableview, imageview, etc..) When I tap the uibutton I display a small uiview (200x150), if the user taps the uibuttons in smallview I hide the smallview. But I can't hide the uiview if the user taps the background. I tried this code.. -(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ //NSLog(@"Touches began."); [self hideShareView]; } It doesn't work if I tap the another button in the uiviewcontrols view. I just want my uiviewcontrol's uiview to react first. I think its about firstResponder but I dont know how to set it first. edit: i want it to work like a uiPopover in ipad.

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• Detecting GWT RichTextArea 'dirty' state

  - by David

  I want to detect when the contents of my GWT RichTextArea become 'dirty' (have been changed by the user) in order to enable a 'save' button accordingly. I suppose I could listen for key presses that are likely to have changed the contents; but browser support for key presses is notoriously quirky. I suppose I could, before editing begins, save the original contents in a variable, and upon key press, compare the current contents against that variable, but doing that on each key press is going to be really slow. Is there some neat way to achieve RichTextArea dirty-detection?

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• How secure are GUIDs in terms of predictability?

  - by ssg

  We're using .NET's Guid.NewGuid() to generate activation codes and API keys currently. I wonder if that poses a security problem since their algorithm is open. .NET Guid uses Win32 CoCreateGuid and I don't know it's internals (possibly MAC address + timestamp?). Can someone derive a second GUID out of the first one, or can he hit it with some smart guesses or is the randomness good enough so search space becomes too big? Generating random keys have the problem of collision, they need a double check before adding to a database. That's why we stuck with GUIDs but I'm unsure about their security for these purposes. Here are the 4 consecutive UUIDGEN outputs: c44dc549-5d92-4330-b451-b29a87848993 d56d4c8d-bfba-4b95-8332-e86d7f204c1c 63cdf958-9d5a-4b63-ae65-74e4237888ea 6fd09369-0fbd-456d-9c06-27fef4c8eca5 Here are 4 of them by Guid.NewGuid(): 0652b193-64c6-4c5e-ad06-9990e1ee3791 374b6313-34a0-4c28-b336-bb2ecd879d0f 3c5a345f-3865-4420-a62c-1cdfd2defed9 5b09d7dc-8546-4ccf-9c85-de0bf4f43bf0

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• How can I call python module inside versioned package folder?

  - by Yanhua

  I need write python codes which run inside a host application. The python codes should be deployed under a specific folder of the host application. I must put my entry python module under the root of the specific folder. And I want put all my other python codes and c/c++ dll under a sub folder, I prefer to name the sub folder like XXX-1.0, the number is the version of my python codes. The entry python module is just simple call a python module under the sub-folder. By this way different version python codes can be deployed together without collision. May I know it is possible or not? Thanks.

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• How to detect circles accurately

  - by user1767798

  Is there any way to accurately detect circles in opencv? I was using hough transform which give me good result but most of the time, shadow of the object and surrounding,light etc gives bad results, so am looking for options other than hough circles, accurate detection is very important for my project. My basic approach so far is to find some spheres in the image taken in realtime. I am using houghcircle to find the spheres and base later calculations on the radius I am getting from that. If the background is plain and nothing the sphere detect without problem, however if I am taking that image in my room where the background will have other objects it's often difficult to detect. So am looking for some other approach.

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• Calculating terrain height in 3d-space

  - by Jonas B

  Hi I'm diving into 3d programming a bit and am currently learning by writing a procedural terrain generator that generates terrain based on a heightmap. I would also want to implement some physics and my first attempt at terrain collision was by simply checking the current position vs the heightmap. This however wont work well against small objects as you'd have to calculate the height by taking the heightdifference of the nearest vertices of the object and doing this every colision check is pretty slow. Beleive me I tried googling for it but there's simply so much crap and millions of blogs posting ripped-of newbie tutorials everywhere with basically no real information on the subject, I can't find anything that explains it or even names any generally used techniques. I'm not asking for code or a complete solution, but if anyone knows a particular technique good for calculating a high-res heightmap out of the already generated and smoothed terrain I would be very happy as I could look into it further when I know what I'm looking for. Thanks

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• How do I measure distances in an image?

  - by Ram Bhat

  Let's say we have an image like so Let's say we've already used filters and an edge detection algorithm in this pic. Now my goal is to measure distances (NOT actual distances, distance can be in any arbitrary unit) . eg: How do I find the length of the hall? (until the window) Or the height of the bookshelves? How exactly do you place the "scale" and measure. I'm looking for ideas. However it would help if the answers were in terms of OpenCV.

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• Using exponential smoothing with NaN values

  - by Eric

  I have a sample of some kind that can create somewhat noisy output. The sample is the result of some image processing from a camera, which indicates the heading of a blob of a certain color. It is an angle from around -45° to +45°, or a NaN, which means that the blob is not actually in view. In order to combat the noisy data, I felt that exponential smoothing would do the trick. However, I'm not sure how to handle the NaN values. On the one hand, involving them in the math would result in a NaN average, which would then prevent any meaningful results. On the other hand, ignoring NaN values completely would mean that a "no-detection" scenario would never be reported. And just to complicate things, the data is also noisy in that it can get false NaN value, which ideally would be smoothed somehow to prevent random noise. Any ideas about how I could implement such an exponential smoother?

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• touchesMoved QuartzDemo application

  - by BittenApple

  I am modifying the QuartzDemo application to include swipe detection while UIView is active (a PDF page being displayed in it via Quartz). This will not work, the event never gets to the QuartzView.m because it sits under scrollview? touchesBegan works fine and I can use single tap. How can I go about with catching touchesMoved while PDF page is being displayed? I need a simple example with code that does nothing on touchesMoved, I'll build up on that later. Please keep in mind that I still want to use the UIScrollview as it is and show PDF content based on selection in that scrollview.

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• Parallel Processing Simulation in Javascript

  - by le_havre

  Hello, I'm new to JavaScript so forgive me for being a n00b. When there's intensive calculation required, it more than likely involves loops that are recursive or otherwise. Sometimes this may mean having am recursive loop that runs four functions and maybe each of those functions walks the entire DOM tree, read positions and do some math for collision detection or whatever. While the first function is walking the DOM tree, the next one will have to wait its for the first one to finish, and so forth. Instead of doing this, why not launch those loops-within-loops separately, outside the programs, and act on their calculations in another loop that runs slower because it isn't doing those calculations itself? Retarded or clever? Thanks in advance!

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• XNA - Pong Clone - Reflecting ball when it hits a wall?

  - by toleero

  Hi guys, I'm trying to make the ball bounce off of the top and bottom 'Walls' of my UI when creating a 2D Pong Clone. This is my Game.cs public void CheckBallPosition() { if (ball.Position.Y == 0 || ball.Position.Y >= graphics.PreferredBackBufferHeight) ball.Move(true); else ball.Move(false); if (ball.Position.X < 0 || ball.Position.X >= graphics.PreferredBackBufferWidth) ball.Reset(); } At the moment I'm using this in my Ball.cs public void Move(bool IsCollidingWithWall) { if (IsCollidingWithWall) { Vector2 normal = new Vector2(0, 1); Direction = Vector2.Reflect(Direction,normal); this.Position += Direction; Console.WriteLine("WALL COLLISION"); } else this.Position += Direction; } It works, but I'm using a manually typed Normal and I want to know how to calculate the normal of the top and bottom parts of the screen?

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• Eval IronPython Scripts during ASP.NET Web Request; Static Engine or Not

  - by Josh Pearce

  I would like to create an ASP.NET MVC web application which has extensible logic that does not require a re-build. I was thinking of creating a filter which had an instance of the IronPython engine. What I would like to know is: how much overhead is there in creating a new engine during each web request, and would it be a better idea to keep a static engine around? However, if I were to keep a single static engine around, what are the issues I might run into as far as locking and script scope? Is it possible to have multiple scopes in the same IropPython engine so I don't get variable collision and security issues between web requests?

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• Custom Parser for JQuery Tablesorter

  - by Tim

  I'm using the jQuery Tablesorter and have an issue with the order in which parsers are applied against table columns. I'm adding a custom parser to handle currency of the form $-3.33. $.tablesorter.addParser({ id: "fancyCurrency", is: function(s) { return /^\$[\-]?[0-9,\.]*$/.test(s); }, format: function(s) { s = s.replace(/[$,]/g,''); return $.tablesorter.formatFloat( s ); }, type: "numeric" }); The problem seems to be that the built-in currency parser takes precedence over my custom parser. I could put the parser in the tablesorter code itself (before the currency parser) and it works properly, but this isn't very maintainable. I can't specify the sorter manually using something like: headers: { 3: { sorter: "fancyNumber" }, 11: { sorter: "fancyCurrency" } } since the table columns are generated dynamically from user inputs. I guess one option would be to specify the sorter to use as a css class and use some JQuery to explicitly specify a sorter like this question suggests, but I'd prefer to stick with dynamic detection if possible.

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• jquery ui position fails with margin

  - by oliwel

  Hi, I am trying to use jQuery to position an inpage div (Context-Menu) relative to a clicked tablerow on a webpage. This works fine until I add an offset with either "left" or "margin-left" to the outer container. Using padding-left works.... The relevant code is: $('#supermenu').position({ my: "left top", at: "left top", of: $(event.target).closest('tr'), collision: "fit" }); The caller looks like: <tr onclick="getMenu(event)"><td>.... What happens: The left margin is added "twice" to the X Offset, so the Menu is not aligned to the left border of the table but somewhere right of it. The offset from the border is exactly the offset from the outer container. Anybody can shed some light? Oliver

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• Event handling to detect if user clicks a 'Like' button in XFBML page

  - by Simon_Weaver

  I have a Facebook connect app / canvas IFrame app which has a Like control for a fanpage. I'd like to detect when the user clicks the Like button to be able to display additional info (a discount coupon code). I'm using the latest Javascript API but the events that can be handled doesn't seem to include detection of social widget controls. The documentation for the Like Plugin doesn't show any events. However I know its definitely possible because if I have two Like buttons on a page they both instantly update each other if I like or unlike whatever it is.

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• Why is 'using' improving C# performances

  - by Wernight

  It seems that in most cases the C# compiler could call Dispose() automatically. Like most cases of the using pattern look like: public void SomeMethod() { ... using (var foo = new Foo()) { ... } // Foo isn't use after here (obviously). ... } Since foo isn't used (that's a very simple detection) and since its not provided as argument to another method (that's a supposition that applies to many use cases and can be extended), the compiler could automatically call Dispose() without the developper requiring to do it. This means that in most cases the using is pretty useless if the compiler does some smart job. IDisposable seem low level enough to me to be taken in account by a compiler. Now why isn't this done? Wouldn't that improve the performances (if the developpers are... dirty).

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• Getting object coordinates from camera

  - by user566757

  I've implemented a camera in Java using a position vector and three direction vectors so I can use gluLookAt(); moving around in `ghost mode' works fine enough, but I want to add collision detection. I can't seem to figure out how to transform my position vector to coordinates in which OpenGL draws my objects. A rough sketch of my drawing loop is this: glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); camera.setView(); drawer.drawTheScene(); I'm at a loss of how to proceed; looking at the ModelView matrix between calls and my position vector, I haven't found any kind of correlation.

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