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  • Dynamicall Rendering in a Scrollable Area

    - by James
    What is the generic algorithm or process that is commonly used to dynamically render portions of a scrolling area? For example, in Google Maps, when the user scrolls past the bounds of the currently rendered area, a grey checkerboard pattern is displayed within the not-yet-rendered portions while the application loads and renders those areas. I'm looking specifically for the approach, or the mathematics, related to filling a graphics area in chunks based on what has just come into view. If possible, I'm looking for anything relevant to the GDI+ process of doing so.

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  • Multiple resultsets from Oracle in Odp.net,without refcursors

    - by James L
    SQL Server is able to return the results of multiple queries in a single round-trip, e.g: select a, b, c from y; select d, e, f from z; Oracle doesn't like this syntax. It is possible to use reference cursors, like this: begin open :1 for select count(*) from a; open :2 for select count(*) from b; end; However, you incur a penalty in opening/closing cursors and you can hold database locks for an extended period. What I'd like to do is retrieve the results for these two queries in one shot, using Odp.net. Is it possible?

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  • [jQuery] Sort contents alphabetically

    - by James
    So I am appending the following after an AJAX call, and this AJAX call may happen several time, returning several data items. And I am trying to use Tinysort [http://plugins.jquery.com/project/TinySort] to sort the list everytime, so the new items added are integrated nicely and sorted alphabetically. It unfortunately doesn't seem to be working. Any ideas? I mean, the data itself is being correctly appended, but unfortunately the sorting isn't occurring. var artists = []; $.each(data.artists, function(k, v) { artists.push('<section id="artist:' + v.name + '" class="artist"><div class="span-9"><img alt="' + v.name + '" width="34" height="34" class="photo" src="' + v.photo + '" /><strong>' + v.name + '</strong><br/><span>' + v.events + ' upcoming gig'); if (v.events != 1) { artists.push('s'); } artists.push('</span></div><div class="span-2 align-right last">Last</div><div class="clear"></div></section>'); }); $('div.artists p').remove(); $('div.artists div.next').remove(); $('div.artists').append(artists.join('')).append('<div class="next"><a href="#">Next</a></div>'); $('div.artists section').tsort('section[id]', {orderby: 'id'}); Thanks!

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  • Rendering a CGPDFPage into a UIImage

    - by James Antrobus
    I'm trying to render a CGPDFPage (selected from a CGPDFDocument) into a UIImage to display on a view. I have the following code in MonoTouch which gets me part way there. RectangleF PDFRectangle = new RectangleF(0, 0, UIScreen.MainScreen.Bounds.Width, UIScreen.MainScreen.Bounds.Height); public override void ViewDidLoad () { UIGraphics.BeginImageContext(new SizeF(PDFRectangle.Width, PDFRectangle.Height)); CGContext context = UIGraphics.GetCurrentContext(); context.SaveState(); CGPDFDocument pdfDoc = CGPDFDocument.FromFile("test.pdf"); CGPDFPage pdfPage = pdfDoc.GetPage(1); context.DrawPDFPage(pdfPage); UIImage testImage = UIGraphics.GetImageFromCurrentImageContext(); pdfDoc.Dispose(); context.RestoreState(); UIImageView imageView = new UIImageView(testImage); UIGraphics.EndImageContext(); View.AddSubview(imageView); } A section of the CGPDFPage is displayed but rotated back-to-front and upside down. My question is, how do I select the full pdf page and flip it round to display correctly. I have seen a few examples using ScaleCTM and TranslateCTM but couldn't seem to get them working. Any examples in ObjectiveC are fine, I'll take all the help I can get :) Thanks

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  • Quick and easy flood protection?

    - by James P
    I have a site where a user submits a message using AJAX to a file called like.php. In this file the users message is submitted to a database and it then sends a link back to the user. In my Javascript code I disabled the text box the user types into when they submit the AJAX request. The only problem is, a malicious user can just constantly send POST requests to like.php and flood my database. So I would like to implement simple flood protection. I don't really want the hassle of another database table logging users IPs and such... as if they are flooding my site there will be a lot of database read/writes slowing it down. I thought about using sessions, like have a session that contains a timestamp that gets checked every time they send data to like.php, and if the current time is before the timestamp let them add data to the database, otherwise send out an error and block them. If they are allowed to enter something into the database, update their session with a new timestamp. What do you think? Would this be the best way to go about it or are there easier alternatives? Thanks for any help. :)

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  • Statistics Question: Kernel Smoothing in R

    - by James Thompson
    I have data of this form: x y 1 0.19 2 0.26 3 0.40 4 0.58 5 0.59 6 1.24 7 0.68 8 0.60 9 1.12 10 0.80 11 1.20 12 1.17 13 0.39 I'm currently plotting a kernel-smoothed density estimate of the x versus y using this code: smoothed = ksmooth( d$resi, d$score, bandwidth = 6 ) plot( smoothed ) I simply want a plot of the x versus smoothed(y) values, which is ## Heading ## However, the documentation for ksmooth suggests that this isn't the best kernel-smoothing package available: This function is implemented purely for compatibility with S, although it is nowhere near as slow as the S function. Better kernel smoothers are available in other packages. What other kernel smoothers are better can these smoothers be found?

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  • CakePHP HABTM Filtering

    - by James Haigh
    Hi, I've got two tables - users and servers, and for the HABTM relationship, users_servers. Users HABTM servers and vice versa. I'm trying to find a way for Cake to select the servers that a user is assigned to. I'm trying things like $this->User->Server->find('all'); which just returns all the servers, regardless of whether they belong to the user. $this->User->Server->find('all', array('conditions' => array('Server.user_id' => 1))) just gives an unknown column SQL error. I'm sure I'm missing something obvious but just need someone to point me in the right direction. Thanks!

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  • Loading large amounts of data to an Oracle SQL Database

    - by James
    Hey all, I was wondering if anyone had any experience with what I am about to embark on. I have several csv files which are all around a GB or so in size and I need to load them into a an oracle database. While most of my work after loading will be read-only I will need to load updates from time to time. Basically I just need a good tool for loading several rows of data at a time up to my db. Here is what I have found so far: I could use SQL Loader t do a lot of the work I could use Bulk-Insert commands Some sort of batch insert. Using prepared statement somehow might be a good idea. I guess I was wondering what everyone thinks is the fastest way to get this insert done. Any tips?

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  • Accessing elements from an array in objective c

    - by James
    I am trying to access individual elements of my array. This is an example of the contents of the array i am trying to access. <City: 0x4b77fd0> (entity: Spot; id: 0x4b7e580 <x-coredata://D902D50B-C945-42E2-8F71-EDB62222C0A7/Spot/p5> ; data: { CityToProvince = 0x4b7dbd0 <x-coredata://D902D50B-C945-42E2-8F71-EDB62222C0A7/County/p15>; Description = "Friend"; Email = "[email protected]"; Age = 21; Name = "Adam"; Phone = "+44175240"; }), The elements i am trying to access are Name, Phone, etc ... How would i go about doing this?

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  • JPA: persisting object, parent is ok but child not updated

    - by James.Elsey
    Hello, I have my domain object, Client, I've got a form on my JSP that is pre-populated with its data, I can take in amended values, and persist the object. Client has an abstract entity called MarketResearch, which is then extended by one of three more concrete sub-classes. I have a form to pre-populate some MarketResearch data, but when I make changes and try to persist the Client, it doesn't get saved, can someone give me some pointers on where I've gone wrong? My 3 domain classes are as follows (removed accessors etc) public class Client extends NamedEntity { @OneToOne @JoinColumn(name = "MARKET_RESEARCH_ID") private MarketResearch marketResearch; ... } @Inheritance(strategy = InheritanceType.JOINED) public abstract class MarketResearch extends AbstractEntity { ... } @Entity(name="MARKETRESEARCHLG") public class MarketResearchLocalGovernment extends MarketResearch { @Column(name = "CURRENT_HR_SYSTEM") private String currentHRSystem; ... } This is how I'm persisting public void persistClient(Client client) { if (client.getId() != null) { getJpaTemplate().merge(client); getJpaTemplate().flush(); } else { getJpaTemplate().persist(client); } } To summarize, if I change something on the parent object, it persists, but if I change something on the child object it doesn't. Have I missed something blatantly obvious? Thanks

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  • How to create relationship mapping via Entity framework

    - by James
    I have following domain model: User { int Id; } City { int Id; } UserCity { int UserId, int CityId, dateTime StartDate } In the function where I have to attach a user to a city, the following code is working for me: UserCity uc = new UserCity(); //This is a db hit uc.User = MyEntityFrameworkDBContext.User.FirstOrDefault(u => u.ID == currentUserId); //this is a db hit uc.City = MyEntityFrameworkDBContext.City.FirstOrDefault(c => c.ID == currentCityId); uc.StartDate = userCityStartDate; //this is a db hit MyEntityFrameworkDBContext.SaveChanges(); Is there any way I can create relationships with just one single DB hit? The first two db hits are not required, actually.

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  • Copy of Access mdb database being updated by live database

    - by James
    I'm trying to compute statistics for data held in an Access .mdb database. In order to avoid interfering with the live database, I'm working from a copy which I made by simply using copy-paste in Windows Explorer. The copy resides in the same directory, but with a different name. I'm using R and RODBC to connect to the copy of the file. The strange thing is that new data that is being updated on the original live database is appearing in my queries. This is despite the file timestamps of the copy not changing at all. It is also causing some slowdown in the live database. My understanding is that the .mdb files are standalone, or is this not the case? Should I have copied the database in a different way?

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  • Slideshow positioning problem

    - by James
    I have a javascript slideshow that works perfectly on Windows 7, Firefox, Chrome, IE 8+ (I don't have the resources to check 6 or 7) and Opera. But I've been told that when on xp with IE 7 the slidshow gets thrown off screen to the right. What could my issue be? Here is my css: #page { width:940px; margin: auto; } gallery { position:relative; padding:0px; margin:5px 0px; width:940px; height:320px; } gallery li { display: block; width:940px; height:320 list-style:none; } And here is my javascript: var galleryId = 'gallery'; var gallery; var galleryImages; var currentImage; var previousImage; var preInitTimer; preInit(); function preInit() { if ((document.getElementById)&&(gallery=document.getElementById(galleryId))) { gallery.style.visibility = "hidden"; if (typeof preInitTimer != 'undefined') clearTimeout(preInitTimer); } else { preInitTimer = setTimeout("preInit()",2); } } function fader(imageNumber,opacity) { var obj=galleryImages[imageNumber]; if (obj.style) { if (obj.style.MozOpacity!=null) { obj.style.MozOpacity = (opacity/100) - .001; } else if (obj.style.opacity!=null) { obj.style.opacity = (opacity/100) - .001; } else if (obj.style.filter!=null) { obj.style.filter = "alpha(opacity="+opacity+")"; } } } function fadeInit() { if (document.getElementById) { preInit(); galleryImages = new Array; var node = gallery.firstChild; while (node) { if (node.nodeType==1) { galleryImages.push(node); } node = node.nextSibling; } for(i=0;i galleryImages[i].style.position='absolute'; galleryImages[i].style.top=0; galleryImages[i].style.zIndex=0; fader(i,0); } gallery.style.visibility = 'visible'; currentImage=0; previousImage=galleryImages.length-1; opacity=100; fader(currentImage,100); window.setTimeout("crossfade(100)", 1000); } } function crossfade(opacity) { if (opacity < 100) { fader(currentImage,opacity); opacity += 9; window.setTimeout("crossfade("+opacity+")", 50); } else { fader(previousImage,0); previousImage=currentImage; currentImage+=1; if (currentImage=galleryImages.length) { currentImage=0; } galleryImages[previousImage].style.zIndex = 0; galleryImages[currentImage].style.zIndex = 100; opacity=0; window.setTimeout("crossfade("+opacity+")", 5000); } } addEvent(window,'load',fadeInit) function addEvent(elm, evType, fn, useCapture) { if (elm.addEventListener){ elm.addEventListener(evType, fn, useCapture); return true; } else if (elm.attachEvent){ var r = elm.attachEvent("on"+evType, fn); return r; } } And ideas?

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  • Configure ERP conectivity to a Flex application via a web service

    - by James
    I am developing a Flex application that will need to 'pull' information from an ERP system such as SAP or Peoplesoft via the clients web service. My application will need to pass credentials & query to a Query_URL and receive the returned data. I saw a Flash Builder 4 presentation where the Adobe evangelist created a similar application using Twitter. Insights or links to example code would be appreciated.

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  • finding N contiguous zero bits in an integer to the left of the MSB from another

    - by James Morris
    First we find the MSB of the first integer, and then try to find a region of N contiguous zero bits within the second number which is to the left of the MSB from the first integer. Here is the C code for my solution: typedef unsigned int t; unsigned const t_bits = sizeof(t) * CHAR_BIT; _Bool test_fit_within_left_of_msb( unsigned width, t val1, t val2, unsigned* offset_result) { unsigned offbit = 0; unsigned msb = 0; t mask; t b; while(val1 >>= 1) ++msb; while(offbit + width < t_bits - msb) { mask = (((t)1 << width) - 1) << (t_bits - width - offbit); b = val2 & mask; if (!b) { *offset_result = offbit; return true; } if (offbit++) /* this conditional bothers me! */ b <<= offbit - 1; while(b <<= 1) offbit++; } return false; } Aside from faster ways of finding the MSB of the first integer, the commented test for a zero offbit seems a bit extraneous, but necessary to skip the highest bit of type t if it is set. I have also implemented similar algorithms but working to the right of the MSB of the first number, so they don't require this seemingly extra condition. How can I get rid of this extra condition, or even, are there far more optimal solutions?

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  • FileNotFoundException when cropping a photo

    - by James G
    I'm trying to crop a photo to use in a Live Wallpaper but I'm getting a FileNotFoundException when the crop activity tries to save my new cropped image. This is the code I'm using: File file = new File(getFilesDir(), "wallpaper.jpg"); Intent intent = new Intent("com.android.camera.action.CROP"); intent.setData(uri); DisplayMetrics metrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics); intent.putExtra("outputX", metrics.widthPixels * 2); intent.putExtra("outputY", metrics.heightPixels); intent.putExtra("aspectX", metrics.widthPixels * 2); intent.putExtra("aspectY", metrics.heightPixels); intent.putExtra("scale", true); intent.putExtra("noFaceDetection", true); intent.putExtra("output", Uri.parse("file:/" + file.getAbsolutePath())); startActivityForResult(intent, REQUEST_CROP_IMAGE); The wallpaper.jpg file seems to exist on DDMS file explorer so I'm not sure what I'm doing wrong. Any advice is greatly appreciated.

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  • Making Django ignore string literals

    - by James
    UPDATE: It turns out this is a deeper question than I thought at first glance - the issue is that python is replacing the string literals before they ever get to django. I will do more investigating and update this if I find a solution. I'm using django to work with LaTeX templates for report generation, and am running into a lot of problems with the way Django replaces parts of strings. Specficially, I've run into two problems where I try to insert a variable containing latex code. The first was that it would replace HTML characters, such as the less than symbol, with their HTML codes, which are of course gibberish to a LaTeX interpreter. I fixed this by setting the context to never autoescape, like so: c = Context(inputs) c.autoescape = False However, I still have my second issue, which is that Django replaces string literals with their corresponding characers, so a double backslash becomes \, and \b becomes a backspace. How can I force Django to leave these characters in place, so inputs['variable'] = '{\bf this is code} \\' won't get mangled when I use {{variable}} to reference it in the django template?

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  • Image rotate to mouse using Jquery and CSS

    - by James
    I have a compass image and am trying to get the needle to follow the mouse around the page, exactly how the images are rotated in the following demo but without having to shift and click. I'm having trouble breaking down that code however, so any help would be most appreciated. Thanks in advance. http://www.elated.com/res/File/articles/development/javascript/jquery/smooth-rotatable-images-css3-jquery/ The images are simply wrapped in a div <div id="content"> <img id="compass" src="compass.png"/> <img id="needle" src="needle.png"/> </div>

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  • Code refactoring c# question around several if statements performing the same check

    - by James Radford
    I have a method that has a load of if statements that seems a bit silly although I'm not sure how to improve the code. Here's an example. This logic was inside the view which is now in the controller which is far better but is there something I'm missing, maybe a design pattern that stops me having to check against panelCount < NumberOfPanelsToShow and handling the panelCount every condition? Maybe not, just feels ugly! Many thanks if (model.Train && panelCount < NumberOfPanelsToShow) { panelTypeList.Add(TheType.Train); panelCount++; } if (model.Car && panelCount < NumberOfPanelsToShow) { panelTypeList.Add(TheType.Car); panelCount++; } if (model.Hotel && panelCount < NumberOfPanelsToShow) { panelTypeList.Add(TheType.Hotel); panelCount++; } ...

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  • My PHP script for sending emails wont send

    - by James
    Well I'm working on a school project, and I uploaded my script to send emails. I'm pretty much using whats defined here: http://www.webcheatsheet.com/PHP/send_email_text_html_attachment.php . Now, all I really changed(other than the contents), is the receiver, to my email address. However, I'm not getting it in my inbox. Is there something else I need? Do I need to do something with the settings on the server(or have my school enable something)?

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