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  • How do I calculate the average direction of two vectors

    - by Mike Broughton
    Hi, I am writing and opengl based iphone app and would like to allow a user to translate around a view based on the direction that they move two fingers on the screen. For one finger I know I could just calculate the vector from the start position to the current position of the users finger and then find the unit vector of this to get just the direction, but I don't know how I would do this for two fingers, I don't think adding the components of the vectors and calculating the average would work so I'm pretty much stuck... thanks in advance

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  • elisp: posn-at-point returns nil after goto-char. How to update the display before posn-at-point?

    - by Cheeso
    In emacs lisp, posn-at-point is documented as: posn-at-point is a built-in function in C source code. (posn-at-point &optional POS WINDOW) . Return position information for buffer POS in WINDOW. POS defaults to point in WINDOW; WINDOW defaults to the selected window. . Return nil if position is not visible in window. Otherwise, the return value is similar to that returned by event-start for a mouse click at the upper left corner of the glyph corresponding to the given buffer position: (WINDOW AREA-OR-POS (X . Y) TIMESTAMP OBJECT POS (COL . ROW) IMAGE (DX . DY) (WIDTH . HEIGHT)) The posn- functions access elements of such lists. ok, now I've got a function that looks something like this: (defun my-move-and-popup-menu () "move the point, then pop up a menu." (goto-char xxxx) (setq p (posn-at-point)) (my-popup-menu p ...) ) Basically, move the point, then retrieve the screen position at that point, and then popup a menu at that screen position. But I am finding that posn-at-point returns non-nil, only if the xxxx character position (the after position) is visible in the window, before the call to goto-char. It seems that the position is not actually updated until exit from the function. If goto-char goes a long way, more than one screenful, then the retrieved position is always nil, and my code doesn't know where to popup the menu. The reason I suggest that the position is not actually updated until exit from the function - when the menu successfully pops up, the cursor is clearly visible in its previous location while the popup menu is being displayed. When I dismiss the menu, the cursor moves to where I expected it to move, after the goto-char call. How can I get the position to be really updated, between goto-char and posn-at-point, so that posn-at-point will not return nil? In a Windows Forms application I would call Form.Update() or something similar to update the display in the middle of an event handler. What's the emacs version of that?

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  • Android menu view, gridview or something else?

    - by dfilkovi
    I need to create a home screen (menu) with four to six items arranged in a grid view, each item needs to have an icon and a text below the icon. I googled and everything I could find were adapterView examples, with dynamic menu loading, and I want to make it with static xml, this view will not change so no need for dynamic code. Can anyone post an xml example of this?

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  • Disable iOS keyboard (don't show it at all) in phonegap

    - by lashleigh
    If I were writing a native app I would try the solution given here which says: Try to implement the following method in text view's delegate: - (BOOL)textViewShouldBeginEditing:(UITextView *)textView{ return NO; } Unfortunately I need to use phonegap, so I don't have a text view to manipulate. It would be great if I could permanently suppress the keyboard in this app. We've got some custom on screen keyboard that people are supposed to use instead. So, any idea how to disable the popup keyboard completely?

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  • right click event in opencv

    - by Himz
    Hello all I am developing a program using OpenCV (IDE = devcpp). I am able to get the hand contour , move cursor position according to our our hand. no i want to implement right click functionality .Please help me with it . i am using event SetCursorPos(x,y) to set the cursor position on the screen is there any simple function to implement rightclick the same way .??

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  • Is it even possible to change a UIButtons background color??

    - by dubbeat
    Hey, This one has me stumped. Is it possible at all to change the background color of a UIButton in Cocoa for iphone. I've tried setting the background color but it only changes the corners. SetBackgroundColor seems to be the only method available for such things. Please refer to my screen shot [random setBackgroundColor:[UIColor blueColor]]; [random.titleLabel setBackgroundColor:[UIColor blueColor]];

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  • How to change color of selected references

    - by user272924
    Visual Studio 2010 highlights all references to the same variable (or class) when your cursor is placed over it. with the theme I use highlighted references are white on white - making them virtually impossible to read. what is the name of "display item" in Options- Environment Fonts and Colors that is responsible for that color? changing Plain Text to a darker one partially solves an issue however that also changes color for lots of other stuff on a screen, so ideally would be to change a background for this type of "selection"..

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  • Calling compiled C from R with .C()

    - by Sarah
    I'm trying to call a program (function getNBDensities in the C executable measurementDensities_out) from R. The function is passed several arrays and the variable double runsum. Right now, the getNBDensities function basically does nothing: it prints to screen the values of passed parameters. My problem is the syntax of calling the function: array(.C("getNBDensities", hr = as.double(hosp.rate), # a vector (s x 1) sp = as.double(samplingProbabilities), # another vector (s x 1) odh = as.double(odh), # another vector (s x 1) simCases = as.integer(x[c("xC1","xC2","xC3")]), # another vector (s x 1) obsCases = as.integer(y[c("yC1","yC2","yC3")]), # another vector (s x 1) runsum = as.double(runsum), # double DUP = TRUE, NAOK = TRUE, PACKAGE = "measurementDensities_out")$f, dim = length(y[c("yC1","yC2","yC3")]), dimnames = c("yC1","yC2","yC3")) The error I get, after proper execution of the function (i.e., the right output is printed to screen), is Error in dim(data) <- dim : attempt to set an attribute on NULL I'm unclear what the dimensions are that I should be passing the function: should it be s x 5 + 1 (five vectors of length s and one double)? I've tried all sorts of combinations (including sx5+1) and have found only seemingly conflicting descriptions/examples online of what's supposed to happen here. For those who are interested, the C code is below: #include <R.h> #include <Rmath.h> #include <math.h> #include <Rdefines.h> #include <R_ext/PrtUtil.h> #define NUM_STRAINS 3 #define DEBUG void getNBDensities( double *hr, double *sp, double *odh, int *simCases, int *obsCases, double *runsum ); void getNBDensities( double *hr, double *sp, double *odh, int *simCases, int *obsCases, double *runsum ) { #ifdef DEBUG for ( int s = 0; s < NUM_STRAINS; s++ ) { Rprintf("\nFor strain %d",s); Rprintf("\n\tHospitalization rate = %lg", hr[s]); Rprintf("\n\tSimulation probability = %lg",sp[s]); Rprintf("\n\tSimulated cases = %d",simCases[s]); Rprintf("\n\tObserved cases = %d",obsCases[s]); Rprintf("\n\tOverdispersion parameter = %lg",odh[s]); } Rprintf("\nRunning sum = %lg",runsum[0]); #endif } naive solution While better (i.e., potentially faster or syntactically clearer) solutions may exist (see Dirk's answer below), the following simplification of the code works: out<-.C("getNBDensities", hr = as.double(hosp.rate), sp = as.double(samplingProbabilities), odh = as.double(odh), simCases = as.integer(x[c("xC1","xC2","xC3")]), obsCases = as.integer(y[c("yC1","yC2","yC3")]), runsum = as.double(runsum)) The variables can be accessed in >out.

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  • What's the best CDN for image hosting on a high-volume web site?

    - by Mike
    Akamai is way too expensive. Photobucket is not reliable. Is there a great content delivery network that I can use just to host my images? We deploy images programmatically via FTP, so there is some programming behind the scenes. Having some sort of reporting about the reliability of the service, whether it's raw logs files or a web-based admin screen that shows http errors, would also be important. Has anyone worked with edgecast?

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  • mvc partial views loses track of the images folder when using jquery

    - by jvelez
    This is what I have and it works: $(function(){ $('.slide-out-div').tabSlideOut({ tabHandle: '.handle', //class of the element that will become your tab pathToTabImage: 'http://mhmiisdev2/images/contact_tab.gif', //path to the image for the tab //Optionally can be set using css imageHeight: '122px', //height of tab image //Optionally can be set using css imageWidth: '40px', //width of tab image //Optionally can be set using css tabLocation: 'right', //side of screen where tab lives, top, right, bottom, or left speed: 300, //speed of animation action: 'click', //options: 'click' or 'hover', action to trigger animation topPos: '200px', //position from the top/ use if tabLocation is left or right leftPos: '20px', //position from left/ use if tabLocation is bottom or top fixedPosition: true //options: true makes it stick(fixed position) on scroll }); }); This is what I want and it doesnt work when I change from one controller to another controller. NOTICE THE IMAGE PATH IS NOT ABSOLUTE $(function(){ $('.slide-out-div').tabSlideOut({ tabHandle: '.handle', //class of the element that will become your tab pathToTabImage: '/images/contact_tab.gif', //path to the image for the tab //Optionally can be set using css imageHeight: '122px', //height of tab image //Optionally can be set using css imageWidth: '40px', //width of tab image //Optionally can be set using css tabLocation: 'right', //side of screen where tab lives, top, right, bottom, or left speed: 300, //speed of animation action: 'click', //options: 'click' or 'hover', action to trigger animation topPos: '200px', //position from the top/ use if tabLocation is left or right leftPos: '20px', //position from left/ use if tabLocation is bottom or top fixedPosition: true //options: true makes it stick(fixed position) on scroll }); }); the html for completeness.... <div class="slide-out-div"> <a class="handle" href="http://link-for-non-js-users.html">Content</a> <h3>Medical Variance Reports</h3> <div> <ul> <li><a href="http://mhmssrs2/Reports/Pages/Report.aspx?" target="_blank">Individual Medicines</a></li> </ul> </div> </div> I suspect somehow pathToTabImage: /images/contact_tab.gif' loses its context when browsing throught controllers. Help me understand...

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  • Missing Localized Screenshots Error on itunes

    - by Arvind
    I have selected Default Language as "Australian English" as Default language. When I am submitting the binary it showing as rejected"Red Icon" with status "Missing Localized Screenshots". The application is in only single language. I have added screen shots also the application is only for iphone. When I am looking binary information that is showing as: Localizations : ( "en-AU" ) Please suggest me where I am making mistake.

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  • Icon placement relative to list items

    - by Ronedog
    When I show a hidden div that is stored inside an <li> tag the icons are pushing down to the bottom of the <li>. How can I prevent this? Here's the HTML: <ul> <li>Utah <ul> <li>Park City <ul> <li>Park Cat 1 <div><img class="portf_edit" /></div> <div><img class="portf_archive" /></div> <div><img class="portf_delete" /></div> </li> <li>Skiing <div><img class="portf_edit" /></div> <div><img class="portf_archive" /></div> <div><img class="portf_delete" /></div> </li> </ul> </li> </ul> </li> </ul> Here's the li css: li { list-style-type:none; vertical-align: top; list-style-image: none; left:0px; text-align:left; clear: both; } .portf_edit{ float:right; position: relative; right:50px; display:block; } .portf_archive{ float:right; position: relative; right:-5px; display:block; } .portf_delete{ float:right; position: relative; right: -60px; display:block; } Here's a screen shot prior to expanding which shows the icons how I want them to line up: Here's the screen shot prior to expanding which shows where the icons are being pushed to:

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