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• Problem with waitable timers in Windows (timeSetEvent and CreateTimerQueueTimer)

  - by MusiGenesis

  I need high-resolution (more accurate than 1 millisecond) timing in my application. The waitable timers in Windows are (or can be made) accurate to the millisecond, but if I need a precise periodicity of, say, 35.7142857141 milliseconds, even a waitable timer with a 36 ms period will drift out of sync quickly. My "solution" to this problem (in ironic quotes because it's not working quite right) is to use a series of one-shot timers where I use the expiration of each timer to call the next timer. Normally a process like this would be subject to cumulative error over time, but in each timer callback I check the current time (with System.Diagnostics.Stopwatch) and use this to calculate what the period of the next timer needs to be (so if a timer happens to expire a little late, the next timer will automagically have a shorter period to compensate). This works as expected, except that after maybe 10-15 seconds the timer system seems to get bogged down, and a few timer callbacks here and there arrive anywhere from 25 to 100 milliseconds late. After a couple of seconds the problem goes away and everything runs smoothly again for 10-15 seconds, and then the stuttering again. Since I'm using Stopwatch to set each timer period, I'm also using it to monitor the arrival times of each timer callback. During the smooth-running periods, most (maybe 95%) of the intervals are either 35 or 36 milliseconds, and no intervals are ever more than 5 milliseconds away from the expected 35.7142857143. During the "glitchy" stretches, the distribution of intervals is very nearly identical, except that a very small number are unusually large (a couple more than 60 ms and one or two longer than 100 ms during maybe a 3-second stretch). This stuttering is very noticeable, and it's what I'm trying to fix, if possible. For the high-resolution timer, I was using the extremely antique timeSetEvent() multimedia timer from winmm.dll. In pursuit of this problem, I switched to using CreateTimerQueueTimer (along with timeBeginPeriod to set the high-resolution), but I'm seeing the same problem with both timer mechanisms. I've tried experimenting with the various flags for CreateTimerQueueTimer which determine which thread the timer runs on, but the stuttering appears no matter what. Is this just a fundamental problem with using timers in this way (i.e. using each one-shot timer to call the next)? If so, do I have any alternatives? One thing I was considering was to determine how many consecutive 1-millisecond-accuracy ticks would keep my within some arbitrary precision limit before I need to reset the timer. So, for example, if I wanted a 35.71428 period, I could let a 36 ms timer elapse 15 times before it was off by 5 milliseconds, then kill it and start a new one.

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• How can I do vertical paging with UITableView?

  - by vodkhang

  Let me describe the situation I am trying to do: I have a list of Items. When I go into ItemDetailView, which is a UITableView. I want to do paging here like: When I scroll down out of the table view, I want to display the next item. Like in Good Reader: Currently, I am trying 2 approaches but both do not really work for me. 1st: I let my UITableView over my scroll view and I have a nice animation and works quite ok except sometimes, the UITableView will receive event instead of my scroll view. And because, a UITableView is already a UITableView, this approach seems not be a good idea. Here is some code: - (void)applicationDidFinishLaunching:(UIApplication *)application { // a page is the width of the scroll view scrollView.pagingEnabled = YES; scrollView.contentSize = CGSizeMake(scrollView.frame.size.width, scrollView.frame.size.height * kNumberOfPages); scrollView.showsHorizontalScrollIndicator = NO; scrollView.showsVerticalScrollIndicator = YES; scrollView.scrollsToTop = NO; scrollView.delegate = self; [self loadScrollViewWithPage:0]; } - (void)loadScrollViewWithPage:(int)page { if (page < 0) return; if (page >= kNumberOfPages) return; [self.currentViewController.view removeFromSuperview]; self.currentViewController = [[[MyNewTableView alloc]initWithPageNumber:page] autorelease]; if (nil == currentViewController.view.superview) { CGRect frame = scrollView.frame; [scrollView addSubview:currentViewController.view]; } } - (void)scrollViewDidScroll:(UIScrollView *)sender { if (pageControlUsed) { return; } CGFloat pageHeight = scrollView.frame.size.height; int page = floor((scrollView.contentOffset.y - pageHeight / 2) / pageHeight) + 1; [self loadScrollViewWithPage:page]; } - (IBAction)changePage:(id)sender { int page = pageControl.currentPage; [self loadScrollViewWithPage:page]; // update the scroll view to the appropriate page CGRect frame = scrollView.frame; [scrollView scrollRectToVisible:frame animated:YES]; pageControlUsed = YES; } My second approach is: using pop and push of navigationController to pop the current ItemDetail and push a new one on top of it. But this approach will not give me a nice animation of scrolling down like the first approach. So, the answer to how I can get it done with either approach will be appreciated

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• Facebook Javascript SDK's FB.ui Bug in IE8

  - by Lukas

  hi everyone i have found a bug in IE8 using the new Facebook Javascript SDK. i call a Post dialog using: FB.ui( { method: 'stream.publish', display: 'dialog', message: 'test', attachment: { name: 'test', caption: 'test', media: [ {type: 'image', src: site_url+'test.jpg', href: site_url} ], description: ( 'test' ), href: site_url } }, my html structure is: <body> <div id="content"></div> <script type="text/javascript"> var params = { wmode: 'opaque', allowScriptAccess: 'always', quality: 'high', allowFullScreen: "true" }; var attributes = { id: 'test' }; swfobject.embedSWF("frontend/swf/stage.swf", "content", "100%", "100%", "10", params, attributes); var site_url = 'http://test.com'; </script> <div id="fb-root"></div> <script type="text/javascript" src="http://connect.facebook.net/en_US/all.js"></script> <div id="like-dialog" style="display:none;"> <div id="like-dialog-wrapper"> <div id="like-dialog-close"></div> <iframe src="http://www.facebook.com/plugins/likebox.php?id=99999999999&amp;width=292&amp;connections=0&amp;stream=true&amp;header=false&amp;height=395" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:292px; height:395px;"></iframe> </div> </div> </body> the css: html, #content, body { margin: 0; height: 100%; overflow: hidden; } #content { z-index: 1; } what i do is: i embed my stage i call the FB.init function and then call FB.ui function to overlay my flash. it works in every common browser except IE8. in IE8 the div containing the iframe is behind the div where i embed flash, although i set the z-index and position the dialog absolute. any ideas? thanks in advance

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• UITableView's NSString memory leak on iphone when encoding with NSUTF8StringEncoding

  - by vince

  my UITableView have serious memory leak problem only when the NSString is NOT encoding with NSASCIIStringEncoding. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"cell"; UILabel *textLabel1; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; textLabel1 = [[UILabel alloc] initWithFrame:CGRectMake(105, 6, 192, 22)]; textLabel1.tag = 1; textLabel1.textColor = [UIColor whiteColor]; textLabel1.backgroundColor = [UIColor blackColor]; textLabel1.numberOfLines = 1; textLabel1.adjustsFontSizeToFitWidth = NO; [textLabel1 setFont:[UIFont boldSystemFontOfSize:19]]; [cell.contentView addSubview:textLabel1]; [textLabel1 release]; } else { textLabel1 = (UILabel *)[cell.contentView viewWithTag:1]; } NSDictionary *tmpDict = [listOfInfo objectForKey:[NSString stringWithFormat:@"%@",indexPath.row]]; textLabel1.text = [tmpDict objectForKey:@"name"]; return cell; } -(void) readDatabase { NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDir = [documentPaths objectAtIndex:0]; databasePath = [documentsDir stringByAppendingPathComponent:[NSString stringWithFormat:@"%@",myDB]]; sqlite3 *database; if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) { const char sqlStatement = [[NSString stringWithFormat:@"select id,name from %@ order by orderid",myTable] UTF8String]; sqlite3_stmt *compiledStatement; if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) { while(sqlite3_step(compiledStatement) == SQLITE_ROW) { NSString *tmpid = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 0)]; NSString *tmpname = [NSString stringWithCString:(const char *)sqlite3_column_text(compiledStatement, 1) encoding:NSUTF8StringEncoding]; [listOfInfo setObject:[[NSMutableDictionary alloc] init] forKey:tmpid]; [[listOfInfo objectForKey:tmpid] setObject:[NSString stringWithFormat:@"%@", tmpname] forKey:@"name"]; } } sqlite3_finalize(compiledStatement); debugNSLog(@"sqlite closing"); } sqlite3_close(database); } when i change the line NSString *tmpname = [NSString stringWithCString:(const char *)sqlite3_column_text(compiledStatement, 1) encoding:NSUTF8StringEncoding]; to NSString *tmpname = [NSString stringWithCString:(const char *)sqlite3_column_text(compiledStatement, 1) encoding:NSASCIIStringEncoding]; the memory leak is gone i tried NSString stringWithUTF8String and it still leak. i've also tried: NSData *dtmpname = [NSData dataWithBytes:sqlite3_column_blob(compiledStatement, 1) length:sqlite3_column_bytes(compiledStatement, 1)]; NSString *tmpname = [[[NSString alloc] initWithData:dtmpname encoding:NSUTF8StringEncoding] autorelease]; and the problem remains, the leak occur when u start scrolling the tableview. i've actually tried other encoding and it seems that only NSASCIIStringEncoding works(no memory leak) any idea how to get rid of this problem?

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• MVC2 Client validation with Annotations in View with RenderAction

  - by Olle

  I'm having problem with client side validation on a View that renders a dropdownlist with help of a Html.RenderAction. I have two controllers. SpecieController and CatchController and I've created ViewModels for my views. I want to keep it as DRY as possible and I will most probably need a DropDownList for all Specie elsewhere in the near future. When I create a Catch i need to set a relationship to one specie, I do this with an id that I get from the DropDownList of Species. ViewModels.Catch.Create [Required] public int Length { get; set; } [Required] public int Weight { get; set; } [Required] [Range(1, int.MaxValue)] public int SpecieId { get; set; } ViewModels.Specie.List public DropDownList(IEnumerable<SelectListItem> species) { this.Species = species; } public IEnumerable<SelectListItem> Species { get; private set; } My View for the Catch.Create action uses the ViewModels.Catch.Create as a model. But it feels that I'm missing something in the implemetation. What I want in my head is to connect the selected value in the DropDownList that comes from the RenderAction to my SpecieId. View.Catch.Create <div class="editor-label"> <%: Html.LabelFor(model => model.SpecieId) %> </div> <div class="editor-field"> <%-- Before DRY refactoring, works like I want but not DRY <%: Html.DropDownListFor(model => model.SpecieId, Model.Species) %> --%> <% Html.RenderAction("DropDownList", "Specie"); %> <%: Html.ValidationMessageFor(model => model.SpecieId) %> </div> CatchController.Create [HttpPost] public ActionResult Create(ViewModels.CatchModels.Create myCatch) { if (ModelState.IsValid) { // Can we make this StronglyTyped? int specieId = int.Parse(Request["Species"]); // Save to db Catch newCatch = new Catch(); newCatch.Length = myCatch.Length; newCatch.Weight = myCatch.Weight; newCatch.Specie = SpecieService.GetById(specieId); newCatch.User = UserService.GetUserByUsername(User.Identity.Name); CatchService.Save(newCatch); } This scenario works but not as smooth as i want. ClientSide validation does not work for SpecieId (after i refactored), I see why but don't know how I can ix it. Can I "glue" the DropDownList SelectedValue into myCatch so I don't need to get the value from Request["Species"] Thanks in advance for taking your time on this.

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• Android CheckBox -- Restoring State After Screen Rotation

  - by Jared M

  I have come across some very unexpected (and incredibly frustrating) functionality while trying to restore the state of a list of CheckBoxes after a screen rotation. I figured I first would try to give a textual explanation without the code, in case someone is able to determine a solution without all the gory details. If anyone needs more details I can post the code. I have a scrolling list of complex Views that contain CheckBoxes. I have been unsuccessful in restoring the state of these check boxes after a screen rotation. I have implemented onSaveInstanceState and have successfully transfered the list of selected check boxes to the onCreate method. This is handled by passing a long[] of database ids to the Bundle. In onCreate() I check the Bundle for the array of ids. If the array is there I use it to determine which check boxes to check when the list is being built. I have created a number of test methods and have confirmed that the check boxes are being set correctly, based on the id array. As a last check I am checking the states of all check boxes at the very end of onCreate(). Everything looks good... unless I rotate the screen. When I rotate the screen, one of two things happens: 1) If any number of the check boxes are selected, except for the last one, all check boxes are off after a rotation. 2) If the last check box is checked before rotation, then all check boxes are checked after rotation. Like I said, I check the state of the boxes at the very end of my onCreate(). The thing is, the state of the boxes at the end of onCreate is correct based on what I selected before the rotation. However, the state of the boxes on the screen does not reflect this. In addition, I have implemented each check box's setOnCheckChangedListener() and I have confirmed that my check boxes' state's are being altered after my onCreate method returns. Anyone have an idea of what is going on? Why would the state of my check boxes change after my onCreate method returns? Thanks in advance for your help. I have been trying to degub this for a couple days now. After I found that my check boxes were apparently changing somewhere outside my own code I figured it was time to ask around.

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• Center content of UISCrollView when smaller

  - by hgpc

  I have an UIImageView inside a UIScrollView which I use for zooming and scrolling. If the image/content of the scroll view if bigger than the scroll view everything works fine. However, when the image becomes smaller than the scroll view, it sticks to the top left corner of the scroll view. I would like to keep it centered, like the Photos app. Any ideas or examples about keeping the content of the UIScrollView centered when smaller? I am working with iPhone 3.0. The following code almost works. The image returns to the top left corner if I pinch it after reaching the minimum zoom level. - (void)loadView { [super loadView]; // set up main scroll view imageScrollView = [[UIScrollView alloc] initWithFrame:[[self view] bounds]]; [imageScrollView setBackgroundColor:[UIColor blackColor]]; [imageScrollView setDelegate:self]; [imageScrollView setBouncesZoom:YES]; [[self view] addSubview:imageScrollView]; UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"WeCanDoIt.png"]]; [imageView setTag:ZOOM_VIEW_TAG]; [imageScrollView setContentSize:[imageView frame].size]; [imageScrollView addSubview:imageView]; CGSize imageSize = imageView.image.size; [imageView release]; CGSize maxSize = imageScrollView.frame.size; CGFloat widthRatio = maxSize.width / imageSize.width; CGFloat heightRatio = maxSize.height / imageSize.height; CGFloat initialZoom = (widthRatio heightRatio) ? heightRatio : widthRatio; [imageScrollView setMinimumZoomScale:initialZoom]; [imageScrollView setZoomScale:1]; float topInset = (maxSize.height - imageSize.height) / 2.0; float sideInset = (maxSize.width - imageSize.width) / 2.0; if (topInset < 0.0) topInset = 0.0; if (sideInset < 0.0) sideInset = 0.0; [imageScrollView setContentInset:UIEdgeInsetsMake(topInset, sideInset, -topInset, -sideInset)]; } - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView { return [imageScrollView viewWithTag:ZOOM_VIEW_TAG]; } /************************************** NOTE **************************************/ /* The following delegate method works around a known bug in zoomToRect:animated: */ /* In the next release after 3.0 this workaround will no longer be necessary */ /**********************************************************************************/ - (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale { [scrollView setZoomScale:scale+0.01 animated:NO]; [scrollView setZoomScale:scale animated:NO]; // END Bug workaround CGSize maxSize = imageScrollView.frame.size; CGSize viewSize = view.frame.size; float topInset = (maxSize.height - viewSize.height) / 2.0; float sideInset = (maxSize.width - viewSize.width) / 2.0; if (topInset < 0.0) topInset = 0.0; if (sideInset < 0.0) sideInset = 0.0; [imageScrollView setContentInset:UIEdgeInsetsMake(topInset, sideInset, -topInset, -sideInset)]; }

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• Sharing a UIView between UIViewControllers in a UITabBarController

  - by Wireless Designs

  Hi all - I have a UIScrollView that houses a gallery of images the user can scroll through. This view needs to be visible on each of three separate UIViewControllers that are housed within a UITabBarController. Right now, I have three separate UIScrollView instances in the UITabBarController subclass, and the controller manages keeping the three synchronized (when a user scrolls the one they can see, programmatically scrolling the other two to match, etc.), which is not ideal. I would like to know if there is a way to work with only ONE instance of the UIScrollView, but have it show up only in the UIViewController that the user is currently interacting with. This would completely eliminate all the synchronization code. Here is basically what I have now in the UITabBarController (which is where all this is currently managed): @interface ScrollerTabBarController : UITabBarController { FirstViewController *firstView; SecondViewController *secondView; ThirdViewController *thirdView; UIScrollView *scrollerOne; UIScrollView *scrollerTwo; UIScrollView *scrollerThree; } @property (nonatomic,retain) IBOutlet FirstViewController *firstView; @property (nonatomic,retain) IBOutlet SecondViewController *secondView; @property (nonatomic,retain) IBOutlet ThirdViewController *thirdView; @property (nonatomic,retain) IBOutlet UIScrollView *scrollerOne; @property (nonatomic,retain) IBOutlet UIScrollView *scrollerTwo; @property (nonatomic,retain) IBOutlet UIScrollView *scrollerThree; @end @implementation ScrollerTabBarController - (void)layoutScroller:(UIScrollView *)scroller {} - (void)scrollToMatch:(UIScrollView *)scroller {} - (void)viewDidLoad { [self layoutScroller:scrollerOne]; [self layoutScroller:scrollerTwo]; [self layoutScroller:scrollerThree]; [scrollerOne setDelegate:self]; [scrollerTwo setDelegate:self]; [scrollerThree setDelegate:self]; [firstView setGallery:scrollerOne]; [secondView setGallery:scrollerTwo]; [thirdView setGallery:scrollerThree]; } - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { [self scrollToMatch:scrollView]; } @end The UITabBarController gets notified (as the scroll view's delegate) when the user scrolls one of the instances, and then calls methods like scrollToMatch: to sync up the other two with the user's choice. Is there something that can be done, using a many-to-one relationship on IBOutlet or something like that, to narrow this down to one instance so I'm not having to manage three scroll views? I tried keeping a single instance and moving the pointer from one view to the next using the UITabBarControllerDelegate methods (calling setGallery:nil on the current and setGallery:scrollerOne on the next each time it changed), but the scroller never moved to the other tabs. Thanks in advance!

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• IE6 and fieldset background color?

  - by codemonkey613

  Hey, I'm having some difficulty with CSS and IE6 compatibility. URL: http://bit.ly/dlX7cS Problem #1: I put a background image on the fieldset around Canada and United States. In IE6 and IE7, the background bleeds above the border-top of the fieldset. So, I found a fix. It is applied only to IE browsers, and moves the legend up a few pixels, aligning the background correctly. <!-- Fix: IE6/IE7, Legends --> <!--[if lte IE 7]> <style type="text/css"> fieldset { position: relative; } fieldset legend { position: absolute; top: -0.5em; left: 0; } </style> <![endif]--> This fixes IE7. But in IE6, it seems to make my legend for Canada vanish completely. Does anyone have a copy of IE6 they can open my site and tell me if you see Canada label. (I am testing with a multi-IE program, and it keeps crashing. My copy might not be accurate). If it's not there, any suggestions on how to fix it? Also, any suggestion on where I can download working copy of IE6? Problem #2: I have a Google Map embedded using iframe. The width of that iframe is 515px. In Firefox, Chrome, IE7 -- that is the correct alignment. But in IE6, it gets <br/> underneath the Just Energy paragraph beside it. It doesn't fit. I have to change width to 513px for it to fit. Uhm, anyone know where those 2px of difference happen? I removed border, padding, margin from the iframe, but still something is happening. <!-- Google Maps --> <iframe class="gmap" src="http://maps.google.com/maps/ms?hl=en&amp;ie=UTF8&amp;msa=0&amp;msid=100146512697135839835.000481e2a2779e8865863&amp;ll=42,-100&amp;spn=20,80&amp;output=embed" frameborder="0" marginheight="0" marginwidth="0" scrolling="no"></iframe> <!-- / Google Maps --> Er, big headache. lol

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• iPhone SDK can't get UIScrollView to work with a UIWebView

  - by Maxwell Segal

  I am building an app that in part of it has two views - one portrait and one landscape. And I want to offer scrolling and pinch & zooming on the landscape orientation. I've built the two views and the simple UIImages in the landscape view all work OK but it does not seem to insert my UIWebView into the UIScrollView. I've done this before with UIImage and all was OK but I must be missing something here - can anybody help with some advice. I'm sure it's something very simple - perhaps to do with the adding of the subview??. Thanks in advance of your help. I've shown the relevant parts of my code below: @interface MonthViewController : UIViewController <UIScrollViewDelegate> { MonthViewController *monthController; IBOutlet UIView *portraitView; IBOutlet UIView *landscapeView; IBOutlet UIWebView *monthKWHChartPortrait; UIWebView *monthKWHChartLandscape; IBOutlet UIScrollView *scrollChartLandscape; IBOutlet UIImageView *eLogoPortrait; IBOutlet UIImageView *eLogoLandscape; IBOutlet UIImageView *clientLogoPortrait; IBOutlet UIImageView *clientLogoLandscape; IBOutlet UIActivityIndicatorView *loadIndicatorPortrait; IBOutlet UIActivityIndicatorView *loadIndicatorLandscape; NSTimer *timer; IBOutlet UILabel *test; } -(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollChartLandscape { return monthKWHChartLandscape; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation == UIInterfaceOrientationLandscapeRight); } -(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { [super willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:duration]; if (toInterfaceOrientation ==UIInterfaceOrientationLandscapeRight) { NSLog(@"right"); test.text=@"right"; NSString *urlAddressLandscape = @"http://PRIVATEURLHERE.aspx?WIDTH=440"; NSURL *urlLandscape = [NSURL URLWithString:urlAddressLandscape]; NSURLRequest *requestObjLandscape = [NSURLRequest requestWithURL:urlLandscape]; [self.monthKWHChartLandscape loadRequest:requestObjLandscape]; scrollChartLandscape.contentSize = CGSizeMake(monthKWHChartLandscape.frame.size.width, monthKWHChartLandscape.frame.size.height); scrollChartLandscape.maximumZoomScale = 2.5; scrollChartLandscape.minimumZoomScale = 0.6; scrollChartLandscape.showsHorizontalScrollIndicator = YES; scrollChartLandscape.showsVerticalScrollIndicator = YES; scrollChartLandscape.clipsToBounds = YES; scrollChartLandscape.delegate = self; [self.scrollChartLandscape addSubview:monthKWHChartLandscape]; self.view=landscapeView; //self.view.transform=CGAffineTransformMakeRotation(deg2rad*(90)); //self.view.bounds=CGRectMake(0.0, 0.0, 480.0, 320.0); } else

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• IE6 "frame" layout with 100% height and scrollbars

  - by Joe

  I want to achieve a simple "frame" layout with fixed header, fixed left navigation area, and a main content area that fills 100% of the remainder of the viewport with scrollbars if necessary. My best attempt is below - but when I add enough content to the main div to force scrolling, I see that the scrollbar extends below the bottom of the viewport. What am I doing wrong? Or what is IE6 doing wrong and how can I fix it? NB please don't recommend using a more recent browser - I'd love to but can't. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title></title> <style type="text/css"> html, body { height:100%; margin:0; padding:0; overflow:hidden; } div { border:0; margin:0; padding:0; } div#top { background-color:#dddddd; height:100px; } div#left { background-color:#dddddd; float:left; width:120px; height:100%; overflow:hidden; } div#main { height:100%; overflow:auto; } </style> </head> <body> <div id="top">Title</div> <div id="left">LeftNav</div> <div id="main"> Content <p> Lorem ipsum ... </p> ... repeated several times ... </div> </body> </html>

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• Carousel not working in IE7/8

  - by user515990

  I am working with jquery.carouFredSel-4.0.3-packed.js for the carousal and it works good with IE9 and mozilla,but in IE7/8, it says "LOG: carouFredSel: Not enough items: not scrolling " whenever i am seeing it is not the case. The code i am using is <div class="carousel-wrapper"> <div class="mask"> <a class="arrow left off"><-</a> <a class="arrow left on" href="javascript:void(0);"><-</a> <ul> <dsp:droplet name="ForEach"> <dsp:param name="array" value="${listRecommended}"/> <dsp:oparam name="empty">no recommended apps</dsp:oparam> <dsp:oparam name="output"> <li> <a href="javascript:void(0);"><img src="${resourcePath}/images/apps/carousel-image1.jpg" alt="bakery story"/></a> <a href="javascript:void(0);"><dsp:valueof param="element.displayName"/></a><br/> <dsp:getvalueof var="averageRating" param="element.averageRating"/> <dsp:getvalueof var="rating" param="count"/> <div class="rating"> <div class="medium"> <dsp:droplet name="For"> <dsp:param name="howMany" value="${averageRating}"/> <dsp:oparam name="output"> <input checked="checked" class="star {split:1}" disabled="disabled" name="product-similar-'${rating}'" type="radio"> </dsp:oparam> </dsp:droplet> </div> </div> </li> </dsp:oparam> </dsp:droplet> </ul> </div> <a class="arrow right off">-></a> <a class="arrow right on" href="javascript:void(0);">-></a> </div> and javascript library is jquery.carouFredSel-4.0.3-packed.js. Please let me know if someone has faced similar problem. thanks in advance Hemish

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• How do I prevent the concurrent execution of a javascript function?

  - by RyanV

  I am making a ticker similar to the "From the AP" one at The Huffington Post, using jQuery. The ticker rotates through a ul, either by user command (clicking an arrow) or by an auto-scroll. Each list-item is display:none by default. It is revealed by the addition of a "showHeadline" class which is display:list-item. HTML for the UL Looks like this: <ul class="news" id="news"> <li class="tickerTitle showHeadline">Test Entry</li> <li class="tickerTitle">Test Entry2</li> <li class="tickerTitle">Test Entry3</li> </ul> When the user clicks the right arrow, or the auto-scroll setTimeout goes off, it runs a tickForward() function: function tickForward(){ var $active = $('#news li.showHeadline'); var $next = $active.next(); if($next.length==0) $next = $('#news li:first'); $active.stop(true, true); $active.fadeOut('slow', function() {$active.removeClass('showHeadline');}); setTimeout(function(){$next.fadeIn('slow', function(){$next.addClass('showHeadline');})}, 1000); if(isPaused == true){ } else{ startScroll() } }; This is heavily inspired by Jon Raasch's A Simple jQuery Slideshow. Basically, find what's visible, what should be visible next, make the visible thing fade and remove the class that marks it as visible, then fade in the next thing and add the class that makes it visible. Now, everything is hunky-dory if the auto-scroll is running, kicking off tickForward() once every three seconds. But if the user clicks the arrow button repeatedly, it creates two negative conditions: Rather than advance quickly through the list for just the number of clicks made, it continues scrolling at a faster-than-normal rate indefinitely. It can produce a situation where two (or more) list items are given the .showHeadline class, so there's overlap on the list. I can see these happening (especially #2) because the tickForward() function can run concurrently with itself, producing different sets of $active and $next. So I think my question is: What would be the best way to prevent concurrent execution of the tickForward() method? Some things I have tried or considered: Setting a Flag: When tickForward() runs, it sets an isRunning flag to true, and sets it back to false right before it ends. The logic for the event handler is set to only call tickForward() if isRunning is false. I tried a simple implementation of this, and isRunning never appeared to be changed. The jQuery queue(): I think it would be useful to queue up the tickForward() commands, so if you clicked it five times quickly, it would still run as commanded but wouldn't run concurrently. However, in my cursory reading on the subject, it appears that a queue has to be attached to the object its queue applies to, and since my tickForward() method affects multiple lis, I don't know where I'd attach it.

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• SilverLight 3 Beginner question: Scroll with mousewheel and zoom image with panning

  - by JP Hellemons

  Hello, I would like to make a small silverlight app which displays one fairly large image which can be zoomed in by scrolling the mouse and then panned with the mouse. it's similar to the function in google maps and i do not want to use deepzoom. here is what i have at the moment. please keep in mind that this is my first silverlight app: this app is just for me to see it's a good way to build in a website. so it's a demo app and therefor has bad variable names. the initial image is 1800px width. private void sc_MouseWheel(object sender, MouseWheelEventArgs e) { var st = (ScaleTransform)plaatje.RenderTransform; double zoom = e.Delta > 0 ? .1 : -.1; st.ScaleX += zoom; st.ScaleY += zoom; } this works, but could use some smoothing and it's positioned top left and not centered. the panning is like this: found it @ http://stackoverflow.com/questions/741956/wpf-pan-zoom-image and converted it to this below to work in silverlight Point start; Point origin; bool captured = false; private void plaatje_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { plaatje.CaptureMouse(); captured = true; var tt = (TranslateTransform)((TransformGroup)plaatje.RenderTransform) .Children.First(tr => tr is TranslateTransform); start = e.GetPosition(canvasje); origin = new Point(tt.X, tt.Y); } private void plaatje_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { plaatje.ReleaseMouseCapture(); captured = false; } private void plaatje_MouseMove(object sender, MouseEventArgs e) { if (!captured) return; var tt = (TranslateTransform)((TransformGroup)plaatje.RenderTransform).Children.First(tr => tr is TranslateTransform); double xVerschuiving = start.X - e.GetPosition(canvasje).X; double yVerschuiving = start.Y - e.GetPosition(canvasje).Y; tt.X = origin.X - xVerschuiving; tt.Y = origin.Y - yVerschuiving; } so the scaling isn't smooth and the panning isn't working, because when i click it, the image disappears. thanks in advanced!

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• Help with starting up my thin server with Sinatra

  - by enedi

  Hi All, I'm a newcomer trying to get my feet wet with Ruby and Sinatra. I followed the Slicehost articles in getting Ruby 1.9.1 setup along with Thin 1.2.7 with a reverse proxy to Nginx. Most things were going pretty smooth until I tried to start up my thin server. This is the output I get from my logs: $ sudo thin -C config.yml -R config.ru start /home/user/public_html/testapp/config.ru:9:in `block in <main>': undefined method `application' for Sinatra:Module (NoMethodError) from /var/lib/gems/1.9.1/gems/rack-1.1.0/lib/rack/builder.rb:46:in `instance_eval' from /var/lib/gems/1.9.1/gems/rack-1.1.0/lib/rack/builder.rb:46:in `initialize' from /home/user/public_html/testapp/config.ru:1:in `new' from /home/user/public_html/testapp/config.ru:1:in `<main>' from /var/lib/gems/1.9.1/gems/thin-1.2.7/lib/rack/adapter/loader.rb:36:in `eval' from /var/lib/gems/1.9.1/gems/thin-1.2.7/lib/rack/adapter/loader.rb:36:in `load' from /var/lib/gems/1.9.1/gems/thin-1.2.7/lib/thin/controllers/controller.rb:175:in `load_rackup_config' from /var/lib/gems/1.9.1/gems/thin-1.2.7/lib/thin/controllers/controller.rb:65:in `start' from /var/lib/gems/1.9.1/gems/thin-1.2.7/lib/thin/runner.rb:177:in `run_command' from /var/lib/gems/1.9.1/gems/thin-1.2.7/lib/thin/runner.rb:143:in `run!' from /var/lib/gems/1.9.1/gems/thin-1.2.7/bin/thin:6:in `<top (required)>' from /usr/bin/thin:19:in `load' from /usr/bin/thin:19:in `<main>' I can post my config.yml, config.ru and myapp.rb, where my Sinatra code resides (it's basically the sample code ripped from the top of the Sinatra book), if anyone needs to see it, but if you have any ideas on what's going on based on that log itself, I'd appreciate it, as I couldn't find anything on the world wide Google. Also, is this still the preferred way of running Sinatra on thin? I can get the app working with just running it through Ruby itself: $ ruby myapp.rb == Sinatra/1.0 has taken the stage on 4567 for development with backup from Thin This allows me to see my pages in my sandbox. Thank you, all.

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• Panning weirdness on an UserControl

  - by Matías

  Hello, I'm trying to build my own "PictureBox like" control adding some functionalities. For example, I want to be able to pan over a big image by simply clicking and dragging with the mouse. The problem seems to be on my OnMouseMove method. If I use the following code I get the drag speed and precision I want, but of course, when I release the mouse button and try to drag again the image is restored to its original position. using System.Drawing; using System.Windows.Forms; namespace Testing { public partial class ScrollablePictureBox : UserControl { private Image image; private bool centerImage; public Image Image { get { return image; } set { image = value; Invalidate(); } } public bool CenterImage { get { return centerImage; } set { centerImage = value; Invalidate(); } } public ScrollablePictureBox() { InitializeComponent(); SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer, true); Image = null; AutoScroll = true; AutoScrollMinSize = new Size(0, 0); } private Point clickPosition; private Point scrollPosition; protected override void OnMouseDown(MouseEventArgs e) { base.OnMouseDown(e); clickPosition.X = e.X; clickPosition.Y = e.Y; } protected override void OnMouseMove(MouseEventArgs e) { base.OnMouseMove(e); if (e.Button == MouseButtons.Left) { scrollPosition.X = clickPosition.X - e.X; scrollPosition.Y = clickPosition.Y - e.Y; AutoScrollPosition = scrollPosition; } } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); e.Graphics.FillRectangle(new Pen(BackColor).Brush, 0, 0, e.ClipRectangle.Width, e.ClipRectangle.Height); if (Image == null) return; int centeredX = AutoScrollPosition.X; int centeredY = AutoScrollPosition.Y; if (CenterImage) { //Something not relevant } AutoScrollMinSize = new Size(Image.Width, Image.Height); e.Graphics.DrawImage(Image, new RectangleF(centeredX, centeredY, Image.Width, Image.Height)); } } } But if I modify my OnMouseMove method to look like this: protected override void OnMouseMove(MouseEventArgs e) { base.OnMouseMove(e); if (e.Button == MouseButtons.Left) { scrollPosition.X += clickPosition.X - e.X; scrollPosition.Y += clickPosition.Y - e.Y; AutoScrollPosition = scrollPosition; } } ... you will see that the dragging is not smooth as before, and sometimes behaves weird (like with lag or something). What am I doing wrong? I've also tried removing all "base" calls on a desperate movement to solve this issue, haha, but again, it didn't work. Thanks for your time.

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• Fixed point math in c#?

  - by x4000

  Hi there, I was wondering if anyone here knows of any good resources for fixed point math in c#? I've seen things like this (http://2ddev.72dpiarmy.com/viewtopic.php?id=156) and this (http://stackoverflow.com/questions/79677/whats-the-best-way-to-do-fixed-point-math), and a number of discussions about whether decimal is really fixed point or actually floating point (update: responders have confirmed that it's definitely floating point), but I haven't seen a solid C# library for things like calculating cosine and sine. My needs are simple -- I need the basic operators, plus cosine, sine, arctan2, PI... I think that's about it. Maybe sqrt. I'm programming a 2D RTS game, which I have largely working, but the unit movement when using floating-point math (doubles) has very small inaccuracies over time (10-30 minutes) across multiple machines, leading to desyncs. This is presently only between a 32 bit OS and a 64 bit OS, all the 32 bit machines seem to stay in sync without issue, which is what makes me think this is a floating point issue. I was aware from this as a possible issue from the outset, and so have limited my use of non-integer position math as much as possible, but for smooth diagonal movement at varying speeds I'm calculating the angle between points in radians, then getting the x and y components of movement with sin and cos. That's the main issue. I'm also doing some calculations for line segment intersections, line-circle intersections, circle-rect intersections, etc, that also probably need to move from floating-point to fixed-point to avoid cross-machine issues. If there's something open source in Java or VB or another comparable language, I could probably convert the code for my uses. The main priority for me is accuracy, although I'd like as little speed loss over present performance as possible. This whole fixed point math thing is very new to me, and I'm surprised by how little practical information on it there is on google -- most stuff seems to be either theory or dense C++ header files. Anything you could do to point me in the right direction is much appreciated; if I can get this working, I plan to open-source the math functions I put together so that there will be a resource for other C# programmers out there. UPDATE: I could definitely make a cosine/sine lookup table work for my purposes, but I don't think that would work for arctan2, since I'd need to generate a table with about 64,000x64,000 entries (yikes). If you know any programmatic explanations of efficient ways to calculate things like arctan2, that would be awesome. My math background is all right, but the advanced formulas and traditional math notation are very difficult for me to translate into code.

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• UITableViewCell with selectable/copyable text that also detects URLs on the iPhone

  - by Jasarien

  Hi guys, I have a problem. Part of my app requires text to be shown in a table. The text needs to be selectable/copyable (but not editable) and any URLs within the text need to be highlighted and and when tapped allow me to take that URL and open my embedded browser. I have seen a couple of solutions that solve one of either of these problems, but not both. Solution 1: Icon Factory's IFTweetLabel The first solution I tried was to use the IFTweetLabel class made possible by Icon Factory and used in Twitterrific. While this solution allows for links (or anything you can find with a regex) to be detected to be handled on a case by case basis, it doesn't allow for selecting and copying. There is also an issue where if a URL is long enough to be wrapped, the button that the class overlays above the URL to make it interactive cannot wrap and draws off screen, looking very odd. Solution 2: Use IFTweetLabel and handle copy manually The second thing I tried was to keep IFTweetLabel in place to handle the links, but to implement the copying using a long-tap gesture, like how the SMS app handles it. This was just about working, but it doesn't allow for arbitrary selection of text, the whole text is copied, or none is copied at all... Pretty black and white. Solution 3: UITextView My third attempt was to add a UITextView as a subview of the table cell. The only thing that this doesn't solve is the fact that detected URLs cannot be handled by me. The text view uses UIApplication's openURL: method which quits my app and launched Safari. Also, as the table view can get quite large, the number of UITextViews added as subviews cause a noticeable performance drag on scrolling throughout the table, especially on iPhone 3G era devices (because of the creation, layout, compositing whenever a cell is scrolled on screen, etc). So my question to all you knowledgeable folk out there is: What can I do? Would a UIWebView be the best option? Aside from a performance drag, I think a webview would solve all the above issues, and if I remember correctly, back in the 2.0 days, the Apple documentation actually recommended web views where text formatting / hyperlinks were required. Can anyone think of a way to achieve this without a performance drag? Many thanks in advance to everyone who can help.

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• active_scaffold routing error

  - by Elizabeth Buckwalter

  If you haven't seen my question yesterday, this is my second rails app. The first went nice and smooth, but this one keeps giving me one random error after another. I installed active_scaffold for this app as well as the last app (the first error, instead of using script/install plugin git://active_scaffold repository, I did script/install plugin http://active_scaffold repository.) I didn't want to spell out basic CRUD on minor models. After the install problems, (before I found the http solution from a windows user when I'm on Linux) I thought I'd try out Hobo. Well, Hobo updated actionmailer, actionpack, activerecord, activeresource, and installed rack. Rails isn't even using the updated versions. But as you can see at the bottom of the trace it's using rack. I have a feeling it has something to do with my futzing around with installing Hobo which I uninstalled. Thanks in advanced. [Edit] I had asked the question over at the ActiveScaffold Group the answer (if you don't want to follow the link) was that this line needed to be added to routes: map.resources :modelName, :active_scaffold => true It doesn't entirely answer my question, since the documentation said nothing about changing routes. But, it works. [/Edit] ActionController::RoutingError in Departments#index Showing vendor/plugins/active_scaffold/frontends/default/views/_list_header.html.erb where line #8 raised: No route matches {:_method=:get, :action="show_search", :controller="departments"} Extracted source (around line #8): 5: <% next if controller.respond_to? link.security_method and !controller.send(link.security_method) -%> 6: <% next if link.action == 'new' && params[:nested].nil? && active_scaffold_config.list.always_show_create %> 7: <% next if link.action == 'show_search' && active_scaffold_config.list.always_show_search %> 8: <%= render_action_link(link, new_params) -%> 9: <% end -%> 10: 11: <%= loading_indicator_tag(:action => :table) %> Trace of template inclusion: vendor/plugins/active_scaffold/frontends/default/views/list.html.erb Full Trace It was taking forever to format it. I'm still not fully conversant in SO's formatting (sometimes the server is down. reboots are reinstalls. it's a play server)

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• Really "wow" them in the interview

  - by Juliet

  Let me put it to you this way: I'm a top-notch programmer, but a notoriously bad interviewee. I've flunked 3 interviews consecutively because I get so nervous that my voice tightens at least 2 octaves higher and I start visibly shaking -- mind you, I can handle whatever technical questions the interviewer throws at me in that state, but I think it looks bad to come off as a quivering, squeaky-voiced young woman during a job interview. I've just got the personality type of a shy computer programmer. No matter how technical I am, I'm going to get passed up in favor of a smooth talker. I have another interview coming up shortly, and I want to really impress the company. Here are my trouble spots: What can I do to be less nervous during my interview? I always get really excited when I hear I have a face-to-face interview, but get more and more anxious as D-Day the interview approaches. My employers wants me to explain what I used to do at my prior employment. I'm a very chatty person and tend to talk/squeak for 10 minutes at a time. How long or short should I time my answers? On that note, when I'm explaining what I did at prior jobs, what exactly is my interviewer looking for? At some point, my interviewer will ask "do you have any questions for me while you're here?" I should, but what kinds of questions should I ask to show that I'm interested in being employed? My interviewer always asks why I'm looking for a new job. The real reason is that my present salary is $27K/yr [Edit to add: and I've yet to get a raise since I started], and I want to make more money -- otherwise the work environment is fine. How do I sugarcoat "I want to make more money" into something that sounds nicer? I have only one prior programmer job, and I've worked there for 18 months, but I have the skill of someone with 4 to 6 years of experience. What can I say to compete against applicants with more work experience? I took a low-paying $27K/yr programming job just to get my foot in IT, and I've been trying to leverage that job as a stepping stone to better opportunities. I get interviews because I consistently out-score senior-level developers in aptitude tests, and my desired salary range is right in the ballpark of what most companies want to offer. Unfortunately, while I've been a programming as a hobby for 10 years and I'm geared to graduate with my BA in Comp Sci in May '09, employers see me as a junior-level programmer with no degree. I want to prove them wrong and get a job that matches my skill level. I'd appreciate any advice anyone has to offer, especially if they can help me get a better job in the process.

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• How to interpolate hue values in HSV colour space?

  - by nick

  Hi, I'm trying to interpolate between two colours in HSV colour space to produce a smooth colour gradient. I'm using a linear interpolation, eg: h = (1 - p) * h1 + p * h2 s = (1 - p) * s1 + p * s2 v = (1 - p) * v1 + p * v2 (where p is the percentage, and h1, h2, s1, s2, v1, v2 are the hue, saturation and value components of the two colours) This produces a good result for s and v but not for h. As the hue component is an angle, the calculation needs to work out the shortest distance between h1 and h2 and then do the interpolation in the right direction (either clockwise or anti-clockwise). What formula or algorithm should I use? EDIT: By following Jack's suggestions I modified my JavaScript gradient function and it works well. For anyone interested, here's what I ended up with: // create gradient from yellow to red to black with 100 steps var gradient = hsbGradient(100, [{h:0.14, s:0.5, b:1}, {h:0, s:1, b:1}, {h:0, s:1, b:0}]); function hsbGradient(steps, colours) { var parts = colours.length - 1; var gradient = new Array(steps); var gradientIndex = 0; var partSteps = Math.floor(steps / parts); var remainder = steps - (partSteps * parts); for (var col = 0; col < parts; col++) { // get colours var c1 = colours[col], c2 = colours[col + 1]; // determine clockwise and counter-clockwise distance between hues var distCCW = (c1.h >= c2.h) ? c1.h - c2.h : 1 + c1.h - c2.h; distCW = (c1.h >= c2.h) ? 1 + c2.h - c1.h : c2.h - c1.h; // ensure we get the right number of steps by adding remainder to final part if (col == parts - 1) partSteps += remainder; // make gradient for this part for (var step = 0; step < partSteps; step ++) { var p = step / partSteps; // interpolate h var h = (distCW <= distCCW) ? c1.h + (distCW * p) : c1.h - (distCCW * p); if (h < 0) h = 1 + h; if (h > 1) h = h - 1; // interpolate s, b var s = (1 - p) * c1.s + p * c2.s; var b = (1 - p) * c1.b + p * c2.b; // add to gradient array gradient[gradientIndex] = {h:h, s:s, b:b}; gradientIndex ++; } } return gradient; }

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• Release Process Improvements

  - by wallismark

  The process of creating a new build and releasing it to production is a critical step in the SDLC but it is often left as an afterthought and varies greatly from one company to the next. I'm hoping people will share improvements they have made to this process in their organisation so we can all takes steps to 'reduce the pain'. So the question is, specify one painful/time consuming part of your release process and what did you do to improve it? My example: at a previous employer all developers made database changes on one common development database. Then when it came to release time, we used Redgate's SQL Compare to generate a huge script from the differences between the Dev and QA databases. This works reasonably well but the problems with this approach are:- ALL changes in the Dev database are included, some of which may still be 'works in progress'. Sometimes developers made conflicting changes (that were not noticed until the release was in production) It was a time consuming and manual process to create and validate the script (by validate I mean, try to weed out issues like problem 1 and 2). When there were problems with the script (eg the order in which things were run such as creating a record which relies on a foreign key record which is in the script but not yet run) it took time to 'tweak' it so it ran smoothly. It's not an ideal scenario for Continuous Integration. So the solution was:- Enforce a policy of all changes to the database must be scripted. A naming convention was important for ensuring the correct running order of the scripts. Create/Use a tool to run the scripts at release time. Developers had their own copy of the database do develop against (so there was no more 'stepping on each others toes') The next release after we started this process was much faster with fewer problems, indeed the only problems found were due to people 'breaking the rules', eg not creating a script. Once the issues with releasing to QA were fixed, when it came time to release to production it was very smooth. We applied a few other changes (like introducing CI) but this was the most significant, overall we reduced release time from around 3 hours down to a max of 10-15 minutes.

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• Averaging initial values for rolling series

  - by Dave Jarvis

  Question Given a maximum sliding window size of 40 (i.e., the set of numbers in the list cannot exceed 40), what is the calculation to ensure a smooth averaging transition as the set size grows from 1 to 40? Problem Description Creating a trend line for a set of data has skewed initial values. The complete set of values is unknown at runtime: they are provided one at a time. It seems like a reverse-weighted average is required so that the initial values are averaged differently. In the image below the leftmost data for the trend line are incorrectly averaged. Current Solution Created a new type of ArrayList subclass that calculates the appropriate values and ensures its size never goes beyond the bounds of the sliding window: /** * A list of Double values that has a maximum capacity enforced by a sliding * window. Can calculate the average of its values. */ public class AveragingList extends ArrayList<Double> { private float slidingWindowSize = 0.0f; /** * The initial capacity is used for the sliding window size. * @param slidingWindowSize */ public AveragingList( int slidingWindowSize ) { super( slidingWindowSize ); setSlidingWindowSize( ( float )slidingWindowSize ); } public boolean add( Double d ) { boolean result = super.add( d ); // Prevent the list from exceeding the maximum sliding window size. // if( size() > getSlidingWindowSize() ) { remove( 0 ); } return result; } /** * Calculate the average. * * @return The average of the values stored in this list. */ public double average() { double result = 0.0; int size = size(); for( Double d: this ) { result += d.doubleValue(); } return (double)result / (double)size; } /** * Changes the maximum number of numbers stored in this list. * * @param slidingWindowSize New maximum number of values to remember. */ public void setSlidingWindowSize( float slidingWindowSize ) { this.slidingWindowSize = slidingWindowSize; } /** * Returns the number used to determine the maximum values this list can * store before it removes the first entry upon adding another value. * @return The maximum number of numbers stored in this list. */ public float getSlidingWindowSize() { return slidingWindowSize; } } Resulting Image Example Input The data comes into the function one value at a time. For example, data points (Data) and calculated averages (Avg) typically look as follows: Data: 17.0 Avg : 17.0 Data: 17.0 Avg : 17.0 Data: 5.0 Avg : 13.0 Data: 5.0 Avg : 11.0  Related Sites The following pages describe moving averages, but typically when all (or sufficient) data is known: http://www.cs.princeton.edu/introcs/15inout/MovingAverage.java.html http://stackoverflow.com/questions/2161815/r-zoo-series-sliding-window-calculation http://taragana.blogspot.com/ http://www.dreamincode.net/forums/index.php?showtopic=92508 http://blogs.sun.com/nickstephen/entry/dtrace_and_moving_rolling_averages

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• Web P2P video confrence solution

  - by dtroy

  I'm looking for the best possible solution which will allow me to incorporate live video/audio conference between 2 users(only 2 at this point) into a flash gaming platform. The video chat is not just an extra feature, it's the main one. I'm mainly looking at open source implementations or something I'll be able to implement myself, but will consider commercial products if they are exactly what I need. Here are a few things I've looked at, but so far, I didn't find any of them good enough: Flash player 10's P2P capabilities sound promising, but I am aware of the fact that Adobe has not release any information on the RTMFP protocol and that there is no commercial server which supports it at this point. Stream all the video/audio live through a flash server (not p2p), but from my personal experience you don't get a smooth conversation. I think TokBox uses this method Java applets are a possible solution too (to perform p2p), but I don't think it will be a nice and elegant solution to combine them in the game at this point (and requires the user to authorize them). BTW, I couldn't find any useful implementations. So, If you know of any, i'll look into them. Google Gmail Video Chat uses a custom (and proprietary) browser plug-in which does the p2p and streams the video/audio into the flash player. This is a possible solution, but I rather not implement the entire p2p protocol stack + browser plug-in at this stage and concentrate on other aspect of the game itself. I think they are using XMPP based protocol similar to Jingle and they've release a Jingle librarby but without the video confrencing implementation. EDIT: In response to Branden: I am aware of Adobe Stratus. Stratus is a beta, hosted rendezvous service that aids establishing communications between Flash Player endpoints (RTMFP server). This current release of the Stratus is prerelease and is designed for evaluation purposes only. The service is not final. There is no guarantee that the service will continue to exist in the future or any information about the future cost. That's why I don't think it can be used as a commercial solution. At least not yet. I'd appreciate your suggestions and advice. thanks!

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• iPhone SDK / Core Data usage scenario, similar to GAE data store?

  - by boliva

  Hi all, I am currently rewriting a map based App which I wrote in the past, specifically for 2.2.1 devices. Originally I wrote it to make use of SQLite databases but I would like to try and migrate it over Core Data, now that it's available on 3.X (for which I am rewriting to). I am fairly experienced in iPhone/Obj-C development, SQL and server backend technologies, but I have never had the chance to work with Core Data so IDK really if it's the appropiate tool for what I am trying to accomplish. The App works on a limited area in a map over which there are about 4000 placemarks, with different kinds of icons and sizes. Of course not all 4000 placemarks are shown at once but only those currently visible in the map viewport, and depending on the zoom level. What I am doing right now is, after the user moves the map in any way (panning or zooming) I am requesting from the backend server the required information for the placemarks that would be visible given the viewport coordinates boundaries and zoom level, however the process isn't as smooth as I'd like (the backend is sending its response in XML and I am compressing it using gzip), it takes anywhere from 1 to 3 seconds to update the display of the placemarks after the user ends moving the map. What I would like to do is to prefetch all the placemarks data at the App launch and use it all through the app life time - I don't mind storing it for later use because the data should be dynamic. The way I would do it right now is, after retrieving all the data, to store it on an SQLite db which I would query later, whenever the user moves the map, to return only the placemarks inside the viewport coordinate boundaries and specific to a given zoom level. Now, the question itself is, if is it possible to use some more 'native', object driven way to carry this queries process, which got me thinking about Core Data and if it is in any way similar to what Google App Engine offers through its datastore where you can fetch a number of objects from the backend given a certain query or criteria, without resorting to an SQL query itself. Like I said before I don't have any experience on Core Data but I have a pretty deep understanding of Obj-C and iPhone development, as well as SQL databases. Any guides on how to achieve what I'm trying (if possible at all) would be greatly appreciated.

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