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• Which design pattern should I be using?

  - by Gabriel

  Here's briefly what I'm trying to do. The user supplies me with a link to a photo from one of several photo-sharing websites (such as Flickr, Zooomr, et. al). I then do some processing on the photo using their respective APIs. Right now, I'm only implementing one service, but I will most likely add more in the near future. I don't want to have a bunch of if/else or switch statements to define the logic for the different websites (but maybe that's necessary?) I'd rather just call GetImage(url) and have it get me the image from whatever service the url's domain is from. I'm confused how the GetImage function and classes should be designed. Maybe I need the strategy pattern? I'm still reading and trying to understand the various design patterns and how I could make one fit in this case. I'm doing this in C#, but this question is language-agnostic.

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• Calculating 2D angles for 3D objects in perspective

  - by Will

  Imagine a photo, with the face of a building marked out. Its given that the face of the building is a rectangle, with 90 degree corners. However, because its a photo, perspective will be involved and the parallel edges of the face will converge on the horizon. With such a rectangle, is it possible to calculate the angle in 2D of the edges of a face that is 90 degrees to it? In the image below, the blue is the face marked on the photo, and I'm wondering how to calculate the 2D vector of the red lines of the other face:

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• What exactly does raw microphone data represent?

  - by esperantist

  I'm using PyAudio, a PortAudio wrapper for Python. I'm getting data from a microphone. Data which is represented by a continuous stream of bytes divided into chunks (of a size determined by me). I've tried to plot the signal, assuming the bytes represent the current signal amplitude, but I get an interesting image that I can't easily describe. ^^ It seems to be composed of two waves, one shifted from the other. What exactly do the particular bytes represent, and how does this change when I'm recording only one channel, instead of two? Any explanations, suggestions, code snippets, anything, very welcome! (I'm new at this.) Thanks!

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• Does the iPhone compress images saved within my app's documents directory?

  - by Jane Sales

  We are caching images downloaded from our server. We write them to our local storage like this: NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0] ; NSString* folder = [[documentsDirectory stringByAppendingPathComponent:@"flook.images"] retain]; NSString* fileName = [folder stringByAppendingFormat:@"/%@", aBaseFilename]; BOOL writeSuccess = [anImageData writeToFile:fileName atomically:NO]; The downloaded images are always the expected size, around 45-85KB. Later, we read images from our cache like this: NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0] ; NSString* folder = [[documentsDirectory stringByAppendingPathComponent:@"flook.images"] retain]; NSString* fileName = [folder stringByAppendingFormat:@"/%@", aBaseFilename]; image = [UIImage imageWithContentsOfFile:fileName]; Occasionally, the images returned from this cache read are much smaller because they are much more compressed - around 5-10KB. Has the OS done this to us?

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• How to center an R plot after removing axis labels

  - by ConnorG

  I'm working on visualizing a matrix in R (almost exactly like http://reference.wolfram.com/mathematica/ref/MatrixPlot.html), and I've been using image(<matrix>,axes=FALSE) to draw the picture. However, I noticed that with the y-axis turned off, the plot isn't centered--the space is still there for the axis ticks + label. I can finagle some centering with par(oma=c(0,0,0,2.5)) but this seems inefficient and error-prone (if my matrix were to change dimensions/become non-square). Is there a better way to force the graphic to center? The right hand margin is significantly smaller than the left.

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• Imagemagick command line in PHP

  - by charly

  Hello everyone, I've got the following two commands for imagemagick in the command line: convert in.png container-mask.png +matte -compose CopyOpacity -composite out.png composite container.png out.png -compose multiply final.png Those two commands include 3 files: in.png: the file that should be masked container-mask.png: the back/white mask of the areas of container.png where in.png should be visible container.png image that includes the container for in.png, the one that has been masked in black/white with container-mask.png Now the question is how to transpose this commands into PHP calls. I've played around quite a bit, but I can't make sense of the API at http://php.net/manual/en/book.imagick.php Thanks and Bests, Charly

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• [Java] Implement a RSA algorithm

  - by Robin Monjo

  Hello everyone. I want to implement a RSA algorithm to encrypt an image (byte[]). To generate my two keys I used this piece of code : KeyPairGenerator keygen = KeyPairGenerator.getInstance("RSA"); keygen.initialize(512); keyPair = keygen.generateKeyPair(); Once public and private key are generated, I would like to show them to the user so he can distribute the public key and use the private key to decode. How can I get back those key ? Using keygen.getPrivateKey() and keygen.getPublicKey() give me all the information of the RSA algorithm, not only the keys I need. Thanks

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• Bind xaml vector images dynamically

  - by Carl

  I'm looking for a way to bind xaml images dynamically in code. There are lots of examples online to show how to bind png or xaml images in the window's xaml, or to load png files in code. But I have found no examples for xaml files with build action=page. XmlReader can't handle them since they are compiled to baml. LoadComponent(new Uri("...filename.xaml") will apparently load the baml but what kind of image class do I load this into? BitmapImage(new Uri("...filename.xaml") does not seem to work, probably because it's not a bitmap. Thanks in advance.

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• How to create stackoverflow's post voting like ajax function?

  - by Daoming Yang

  Can I use Ajax or Jquery to call a action and change the image, just like stackoverflow's post voting function? In my view, I'm using the following code, but I don't want to refresh the browser. Can anyone provide some code about this? <%if (!item.IsPrinted) { %> <%=Html.ImageLink("~/Content/images/web/delete.png", "printed", "MarkAsPrinted", "Order", item.TaskID, null, null)%> <%} else {%> <img src="~/Content/images/web/star.png" alt="printed" /> <% } %>

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• How to create stackoverflow's post voting like jquery/ajax function?

  - by Daoming Yang

  Can I use Jquery to call an action and then change the image when it success, just like stackoverflow's post voting function? In my view, I'm using the following code, but I don't want to refresh the browser. Can anyone provide some code about this for me? Many thanks. <%if (!item.IsPrinted) { %> <%=Html.ImageLink("~/Content/images/web/delete.png", "printed", "MarkAsPrinted", "Order", item.TaskID, null, null)%> <%} else {%> <img src="~/Content/images/web/star.png" alt="printed" /> <% } %>

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• How to define a multipage environment not interrupted by tables and figures?

  - by Egon Willighagen

  I have defined a new LaTeX environment for excursions in a book chapter I am writing. The environment is multipage and often includes inline images. Moreover, I am using the shaded environment to give the environment a background colour to make it stand out a bit. However, the environment, as shown below, is split up by floating tables and images, which makes the flow of the environment visually more difficult to follow. For example, it is now difficult to see if that floating image or table is part (the missing background colour does not help). So, I like to extend my environment to disallow it to be interrupted by floating elements, but do not know how to get that done. \newcounter{bioclipse} \def\thebioclipse{\thechapter-\arabic{bioclipse}} \newenvironment{bioclipse}[2][]{\begin{small}\begin{shaded}\refstepcounter{bioclipse} \par\medskip\noindent% \textbf{Bioclipse Excursion~\thebioclipse #1: #2 \vspace{0.1cm} \hrule \vspace{0.1cm}} \rmfamily}{\medskip \end{shaded}\end{small}} Any solution to disallow interruption is fine, even if the background colour is done differently.

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• Arraylist as repeater datasource (how to access from .aspx)

  - by Phil

  I have an arraylist: Dim downloadsarray As New ArrayList downloadsarray.Add(iconlink) downloadsarray.Add(imgpath) downloadsarray.Add(filesize) downloadsarray.Add(description) Which is the datasource of my repeater: DownloadsRepeater.DataSource = downloadsarray DownloadsRepeater.DataBind() Please can you tell me how I output the items in the array to the .aspx page. I usually use (when using sqldatareader as datasource): <%#Container.DataItem("1stcolumnnamestring")%> <%#Container.DataItem("2ndcolumnnamestring")%> But this does not work when using the arraylist as datasource. Thanks. ps... I know how to use <%#Container.DataItem% to dump everything but I need to get at the items in the array individually, not have them all ditched out to the page in one go. For example, item 1 contains a link, item 2 contains an image path, item 3 contains a description. I need to have them kick out in the correct order to build the link and icon correctly.

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• DrawImage - unwanted resized

  - by nXqd

  I've implemented GDI+ Drawing, but I really don't know why it's resize unwanted :) case WM_PAINT: { hdc = BeginPaint(hWnd, &ps); Graphics g(hdc); Bitmap* bm; bm = new Bitmap(L"1.png"); g.DrawImage(bm,0,0); g.DrawImage(bm,0,100,126,36); g.DrawImage(bm,0,200,0,0,126,36,UnitPixel); // TODO: Add any drawing code here... EndPaint(hWnd, &ps); break; } the second sprite is the one I want , but I must use the third overload of DrawImage to draw one image.

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• Oracle Professional Developer, Ver. 6.0.33 for MS-DOS

  - by Frank Developer

  Hi, I'm trying to install this fossil in DOS 6.22, which is running in Microsoft Virtual PC 2007. I'm hoping that some of you veteran Oracle developers have any recollection of in what order do these diskette images need to be loaded, since I don't have any documentation available for 6.0.33. A friend emailed me the following 720K diskette images: INSTALLE.IMG RDBMS1.IMG RDBMS2.IMG RDBMS3.IMG RSF.IMG SQLLDR1.IMG SQLLDR2.IMG UTIL1.IMG UTIL2.IMG UTIL3.IMG Within Virtual PC, I capture a diskette image, one at a time, into Drive A: VPC's floppy disk emulation supports FAT12, so the supported diskette formats can be: 720K or 1.44MB. If anyone happens to have documentation for this legacy version, I would greatly appreciate a copy of it! Thank You.

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• Using jQuery to create a video switcher

  - by techcastoni

  I've got a design for a video page which has a main video panel which will load the FLV file into JWPlayer when a thumbnail image is clicked. I think what I'm looking for is a partial page refresh? What is the best way to achieve this effect? This is the script I am using to display the video panel: var s1 = new SWFObject('player.swf','player','682','407','9'); s1.addParam('allowfullscreen','true'); s1.addParam('allowscriptaccess','always'); s1.addParam('flashvars','file=Welcome.f4v'); s1.write('preview');

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• How to display some data differnetly than it is stored.

  - by Ben

  Hello, I seem to have a problem that I can't find a solution for. I have a table that has this format. projectId | departmentId | plan | ETC | month | year | ID But, I need to find a way to take that data and display it like this. Since this is my first time here I can't upload an image, but you can view it here. http://img85.imageshack.us/img85/8253/image004y.png Is this something a gridview can handle, or a repeater, or something else? Thank you. Ben

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• magic records being deleted

  - by chris

  i have customised oscommerce to pull in a csv file of products, delete anything thats not with an image/proper description/proper title gets removed. The import runs on a cron job basis pulling information from a supplier, it hasnt run since yesterday but a product has disappeared- Anyone who has used oscommerce will know that, product information is stored over multiple tables. example is- products product_description and so on. the thing that has got me that the information is deleted from the product table but not from the product_description table. The product that is being deleted is a manually input one which carries a special tag/prefix on the model item of the product table. Therefore shouldn't be touched at all. Am clueles as what is going on. Is there mysql integrity checks deleting records? could there be another plugin working on oscommerce?

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• Loading embedded resource on Windows 7

  - by Flack

  Hello, I have an app that works just fine on my WinXP machine. However, when I try running it on my Win7 machine, it fails whenever it tries to load an embedded resource. The resources are all there (I can see them using Reflector). The lines that fail are all of the form: Splash.Image = new Bitmap(typeof(ContainerForm).Assembly.GetManifestResourceStream("SplashTest.Resources.Logo.gif")); And they all fail with the same exception: Exception='System.ArgumentException: Parameter is not valid. at System.Drawing.Bitmap..ctor(Stream stream) I don't understand why this is not working on my Win7 machine but does on my usual WinXP dev machine. Any ideas?

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• Css3 Transition on background transparent not working in Chrome 5

  - by Ricardo Koch

  I`m trying to create an animation using CSS3 transition. The animation is a gradient background that should change his color (rgba). I used the webkit tag for the gradient and it`s working in Chrome 5.0.375.55. Looking into w3c site I see that "background-image - only gradients" is supported for the transition. (http://www.w3.org/TR/css3-transitions/) But I can only animate the background-color property with this version of chrome. With gradient the transition does not work. Does anyone managed to create an animation with background gradients?

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• How to achieve the recessed text style as in Apple's Messages for Mac?

  - by Thruth

  I'd like to replicate the recessed text style of Messages/iMessage, or, the text "white-shadow" style on a light gray background. Please refer to an image here for the style I desire. As you can see, the texts are with "white-shadow" even on the light gray background. The bold texts do have subpixel rendering while the gray texts don't (by design?). I've tried setBackgroundStyle:NSBackgroundStyleRaised . However it was generating shadows darker than the background. setBackgroundStyle:NSBackgroundStyleLowered was worse that it even overrode my font colour setting. So, what is the right way to do this? Any tricks or just have to subclass NSTextFields ? Thanks.

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• noindex, follow on list views?

  - by Fabrizio

  On one of our client's website we have lot's of list views with links to detail views. (Image a blog with the posts overview and the single pages). The detail views don't change, but the list views will change when new items come up. The pages displaying the list view don't contain any other valuable content. So my question is: Does it make sense to define meta "noindex, follow" on the list view pages (and of course "index, follow" on the detail views) to prevent search engines to point to the list views when the keyword is found in the title or teaser of the list view. By the time the visitor clicks on the list view search result it might have changed and the content is not visible anymore, whereas if he goes directly to the single view he will definitly find what he was searching for? Related question: The startpage also contains mainly a list view. Is it a bad idea to have the start page not indexed? Any SEO gurus here? :) Thanks, Fabrizio.

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• Conversion of VB Code to Delphi

  - by Bharat

  Hi, While searching in the net i got few lines of code in VB for extracting an image from EMF File. I tried to convert that into Delphi but doesnt work. Help me in converting this code to delphi. Public Function CallBack_ENumMetafile(ByVal hdc As Long, _ ByVal lpHtable As Long, _ ByVal lpMFR As Long, _ ByVal nObj As Long, _ ByVal lpClientData As Long) As Long Dim PEnhEMR As EMR Dim PEnhStrecthDiBits As EMRSTRETCHDIBITS Dim tmpDc As Long Dim hBitmap As Long Dim lRet As Long Dim BITMAPINFO As BITMAPINFO Dim pBitsMem As Long Dim pBitmapInfo As Long Static RecordCount As Long lRet = PlayEnhMetaFileRecord(hdc, ByVal lpHtable, ByVal lpMFR, ByVal nObj) RecordCount = RecordCount + 1 CopyMemory PEnhEMR, ByVal lpMFR, Len(PEnhEMR) Select Case PEnhEMR.iType Case 1 'header RecordCount = 1 Case EMR_STRETCHDIBITS CopyMemory PEnhStrecthDiBits, ByVal lpMFR, Len(PEnhStrecthDiBits) pBitmapInfo = lpMFR + PEnhStrecthDiBits.offBmiSrc CopyMemory BITMAPINFO, ByVal pBitmapInfo, Len(BITMAPINFO) pBitsMem = lpMFR + PEnhStrecthDiBits.offBitsSrc tmpDc = CreateDC("DISPLAY", vbNullString, vbNullString, ByVal 0&) hBitmap = CreateDIBitmap(tmpDc, _ BITMAPINFO.bmiHeader, _ CBM_INIT, _ ByVal pBitsMem, _ BITMAPINFO, _ DIB_RGB_COLORS) lRet = DeleteDC(tmpDc) End Select CallBack_ENumMetafile = True End Function

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• tiny mce sql error when adding links

  - by Anders Kitson

  I am using tiny mce with a script I built for uploading some content to a blog like system. Whenever I add a link via tiny mce I get this error. The field type in mysql for $content which is the one carrying the link is longblob if that helps. here is the link error first and then my code You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'google test" href="http://www.google.ca" target="_blank"google est laborum' at line 4 /* GRAB FORM DATA */ $title = $_POST['title']; $date = $_POST['date']; $content = $_POST['content']; $imageName1 = $_FILES["file"]["name"]; $date = date("Y-m-d"); $sql = "INSERT INTO blog (title,date,content,image)VALUES( \"$title\", \"$date\", \"$content\", \"$imageName1\" )"; $results = mysql_query($sql)or die(mysql_error());

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• dvi generation: no bounding box

  - by Akshey

  Hi, I wrote a research paper in latex and generated pdf using kile. It worked perfectly well. Now conference people are asking for dvi file also. But Kile's quick build process does not give a dvi file, but its 'Latex' compile process does. So I tried to compile the document, and it gave errors for includegraphics saying figure not found. When I append the correct extensions to the image names, that errors stopped coming but new errors came "bounding box is missing". I added bounding box values and now DVI file is being generated. My questions are: I have tried giving very high and low bounding box values but there is no deformation in the PDF. Why? Can I generate a DVI without giving bounding box values? Thanks and regards, Akshey

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• Creating a standard card game (iPhone SDK)

  - by Chris

  I am trying to create a card game with a standard deck of cards. I need to be able to create a new card on screen every time someone draws a card from the deck and then be able to continuously move it throughout gameplay. I have image files for every card available in the game. I have tried creating a card object which held a UIImageView for the card along with some other basic data but I had trouble referring back to that card to move it again after the first touch. Was this the right way to do this?

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