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• Basic doubt about sensor usage

  - by Al

  Suppose I have a cellphone with accelerometer and magnetometer, and want to determine its absolute (wrt North/East/South/West) 3d position. Imagine the phone is laid vertically, with the screen facing me, the "up" vector pointing to the ceil. Whenever I tilt, the accelerometer allows me to get the "up" vector info change. The problem is that if I tilt the device and put it horizontally (screen now facing ceil, and "up" vector pointing to the opposite of where I am), then the up vector doesn't get updated any more if I rotate the phone horizontally on the table. This is something that clearly is detected by the magnetometer now. So, the question is, when to know where to use acc or mag for each case? Is there a generic way to achieve this?

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• Bidirectional one-to-many associations with indexed collections in NHibernate

  - by Jørn Schou-Rode

  Last summer, I asked a question regarding how to add new object to an IList mapped as a one-to-many with NHibernate. One of the answers let me to this paragraph in the documentation: Please note that NHibernate does not support bidirectional one-to-many associations with an indexed collection (list, map or array) as the "many" end, you have to use a set or bag mapping. While I am pretty sure I understand what this paragraph says, I have no idea why or how to work around this limitation. As I am now again working with a model that seems to require a "bidirectional one-to-many association with an index collection", I figured the time was right for follow-up questions: Why does NHibernate have this limitation on associations? It is my impression that the guys behind NHibernate are quite clever, so I assume there is a pretty good reason. What are the common workarounds for this shortcoming? Making the collection a non-indexed bag and adding an explicit Position property to the child class? Any better solutions?

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• Creating a Box Control over an area of the map with OpenLayers

  - by Bernie Perez

  I am using OpenLayers to create a box of interest with my program. I am using this code: var control = new OpenLayers.Control(); OpenLayers.Util.extend(control, { draw: function () { this.box = new OpenLayers.Handler.Box( control, {"done": this.notice}, {keyMask: OpenLayers.Handler.MOD_SHIFT}); this.box.activate(); }, notice: function (bounds) { areaSelected(bounds); } }); map.addControl(control); to capture the "Shift Create a Box" control and use the area selected as my area of interest. However the values come back as pixels. But I want Longitude and Latitude, not pixels. The Mouse Position control does show the correct long & lat. I really don't care how to box is created, I just want an easy way for the user to select a area of the map and I need to get the lat & longs of the area. (Box, Circle, doesn't matter)

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• How can you calculate the X/Y coordinate to zoom to

  - by Mark

  Im writing a WPF application that has a zoom and pan ability, but what I want to also implement is the ability to zoom and pan "automatically" (via a button click). I have the methods all defined to zoom and pan, but Im having trouble telling the app the desired X/Y coordinates for the panning. Basically, I know that I want the control to be centered at a desired zoom level (say zoomed in 6X times), but the panning destination point is NOT the center point of the control because after the zooming, its been scaled. Does anyone know a way of calculating the desired X/Y position to pan to, taking into account the zooming as well? Do I just scale the desired destination Point? It doesnt seem to work for me... Thanks a lot

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• Python encoding for pipe.communicate

  - by Brian M. Hunt

  I'm calling pipe.communicate from Python's subprocess module from Python 2.6. I get the following error from this code: from subprocess import Popen pipe = Popen(cwd) pipe.communicate( data ) For an arbitrary cwd, and where data that contains unicode (specifically 0xE9): Exec. exception: 'ascii' codec can't encode character u'\xe9' in position 507: ordinal not in range(128) Traceback (most recent call last): ... stdout, stderr = pipe.communicate( data ) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/subprocess.py", line 671, in communicate return self._communicate(input) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/subprocess.py", line 1177, in _communicate bytes_written = os.write(self.stdin.fileno(), chunk) This is happening, I presume, because pipe.communicate() is expecting ASCII encoded string, but data is unicode. Is this the problem I'm encountering, and i sthere a way to pass unicode to pipe.communicate()? Thank you for reading! Brian

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• .net 4.0 concurrent queue dictionary

  - by freddy smith

  I would like to use the new concurrent collections in .NET 4.0 to solve the following problem. The basic data structure I want to have is a producer consumer queue, there will be a single consumer and multiple producers. There are items of type A,B,C,D,E that will be added to this queue. Items of type A,B,C are added to the queue in the normal manner and processed in order. However items of type D or E can only exist in the queue zero or once. If one of these is to be added and there already exists another of the same type that has not yet been processed then this should update that other one in-place in the queue. The queue position would not change (i.e. would not go to the back of the queue) after the update. Which .NET 4.0 classes would be best for this?

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• How do i create an array of unequal length arrays?

  - by Faken

  Hello everyone, I need to create a sort of 2D array in which each one of the secondary arrays are of different length. I have a 1D array of known length (which defines the number of arrays to be formed) with each element having a number that denotes the length of the secondary array in that position. Each one of the arrays are fairly large so i don't want to create a one-size-fits-all "fake" 2D heap array to cover everything. How would i go about doing this? Any 2D array I have made before are always rectangular. I'm trying to do this so that i can create some code to dynamically generate threads to split up some workload. Thanks, -Faken

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• Flash: Adjust this code to keep the duplicated movie clip

  - by Luke Evans

  OK, so here is my code ham_mc.onPress=function(){ startDrag(this); } ham_mc.onRelease=ham_mc.onReleaseOutside=function(){ stopDrag(); _root.ham_mc.duplicateMovieClip("ham_mc" + "x",2); x++; } The user can at first drag the movie clip. When released, the duplicateMovieClip command runs, leaving a new ham movie clip in the position the first is dragged to. PROBLEM: When I click and drag the first ham movie click again, the duplicateMovieClip runs again but REPLACES the previous generated movie clip. I added x and x++ in an attempt to give the movie clip duplication a different name every time, but this doesn't solve it. How do I change this code so that a NEW ham_mc is created every time, rather than overwriting the old one. I'm tired, sorry for the poor explaination!

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• Decoration View *above* cells in UICollectionView

  - by Dhiraj Gupta

  I've got a decoration view showing the way I want, in my UICollectionView. The position and size is right. The decoration view stays at the frame I'm setting for it in my layout. But, I want the decoration view to be above the cells, not below them. I tried setting the zIndex property on the UICollectionViewLayoutAttributes for the decoration view, but this has no effect - I tried logging out the zindex of the cells, and they're all returning 0, and my decoration view's zIndex is set to 20. I'm guessing having decoration views above the cells is not supported, at least in UICollectionViewFlowLayout? Someone please confirm this, thanks! In the meantime, I'm going back to having a custom UIView subclass as a subview in the parent controller of the collection view and laying out the frame of it in the - (void) viewWillLayoutSubviews() method.

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• PHP SOAP Windows: maximum string content length quota (8192) has been exceeded while reading XML dat

  - by Sadi

  I am trying to use bing with PHP SOAP. It works fine for short strings. But for larger string I get following error: Fatal error: Uncaught SoapFault exception: [a:DeserializationFailed] The formatter threw an exception while trying to deserialize the message: Error in deserializing body of request message for operation 'Translate'. The maximum string content length quota (8192) has been exceeded while reading XML data. This quota may be increased by changing the MaxStringContentLength property on the XmlDictionaryReaderQuotas object used when creating the XML reader. Line 9, position 227. in ........ I am using XAMPP in windows 7. All the solution I found are for .net not the PHP. PHP has no web.config file as far as I concern. Any idea how can I solve it. Thank you Sadi

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• inherit properties and then change some on particular site (css)

  - by Radek

  I have three menus on this test web site. I am learning css and trying all the menus inherit all properties from menu class. The second one looks different and is not clickable. I am happy with the 3rd one, just want to make it horizontal and change its position bit. Could somebody tell me why the second menu is not click-able? how I can make the third menu vertical? I thought that display: block; for li of the 3rd menu would do the trick but I do not know the css path for that li.

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• Why would this div have an unnecessarily large computed height?

  - by Mike Crittenden

  Link: http://www.fraynepainting.com/services The problem is that div#dditem_2 (the div with the "Take a look..." text) is getting a computed height of around 500px for no reason that I can find in the CSS, which is pushing the UL below it down really really far. I discovered that if you set display: none or position: absolute (or anything else that removes it from the flow of elements) on the sidebar, then the bottom UL moves up like it should, so it looks like maybe the UL is trying to clear the sidebar, but I can't figure out why that would be either. I've reproduced the problem in Firefox and Chrome so far. Any ideas?

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• EF problem with entity re-ordering and uniqueness constraint

  - by wpfwannabe

  I am using Entity Framework and I've come to an interesting stumbling block. Let's say there is a db table "Item" with "sequence" column of type int (and others of course). Column "sequence" must be unique and it is used for (re)ordering of items. EF maps this table to "Item" class with "sequence" int property. Now let's say I want to swap position of two items by mutually exchanging each other's sequence number. Upon calling SaveChanges() EF throws an exception complaining about "sequence" uniqueness. It probably generates two UPDATEs and the first one probably fails. I assume that plain SQL solution to this issue is using a third UPDATE to introduce a unique sequence value in the process but I am stuck with EF. Any thoughts?

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• CSS centering text between two images

  - by David Lively

  I need to display two images and some text like so: ------------------------------------------ img1--------some centered text-------img2 ------------------------------------------ img1 and img2 are not the same dimensions, but their widths are very close The text is variable depending on the page in which it is displayed, and may include two lines instead of one. The text needs to centered horizontally between the two images, or between the outside of the container (either will be fine) the text AND the images need to be centered vertically within the container. I can do this VERY easily with a table, but I'd rather not retreat to that for layout. The position:inline-block and display:table-cell attributes work great in some browsers, but I need to support IE6+.

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• C# Training Quizzes

  - by John Sheppard

  Hello there, I have been programming 10 years, mostly in vba and vb.net but I know c# well enough to program what I normally do. I yesterday was applying for a Senior c# position and I did so poorly on the induction test its not funny :) I have always found that for me the best way to learn and recall is via question's and answers (multichoice and short answer). That is, a question is posed and after I answer instant feedback is given as to whether I choose right or wrong and the reasons why. As such I was wondering if anyone knew of or could recommend a C# quiz website. Something like a daily c# quiz to keep my brain up to date and fresh if I'm not always programming in it. Not something wimpy either. Something that does everything. Paying is not an obstacle, id prefer to pay for a good resource than muck around. Thank you

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• matlab: figure size, same axis size

  - by Art

  I have a figure with fixed size, like that: hFig = figure(1); set(hFig, 'Position', [200 200 500 500]) But the thing is, that I want to have my AXIS with fixed size (i want them to be a square), not (necessary) the whole figure... - see image attached, Y axis is a bit longer than X axis (of course longer in a meaning of display... X and Y axis range is set to the same value). How to adjust it? Thanks!

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• How to differentiate between scrollbar click events and scrollbar drag events?

  - by Sameer

  I need to scroll an EXT-GWT grid by some custom amount instead of the default 1-2 rows. Since I couldn't find any parameter that let me do this, I overrode the event handler to capture scroll or mousewheel events. On any such event, I just programmatically move the scroller further by the required amount in the same direction, keeping a flag to ensure that it doesn't go into an infinite loop. However, this technique fails when the user scrolls the grid with the scroller. Specifically, when I drag the scroller from some position to the top of the scroll track, the rows displayed in the grid are not the topmost rows in the grid but some rows further down. I figured that if I could differentiate between the events generated by the scroll-up and scroll-down buttons and those generated by scroller drag, I could handle them separately and rectify the issue. Any way this could be done? Or is there a way to specify the amount by which a scrollbar should scroll in one step? Thanks -Sameer

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• silverlight DataGrid style

  - by Piyush

  my Datagrid is: <data:DataGrid x:Name="dgSearchResults" Style="{StaticResource dgStyle}" Grid.Row="1" ColumnHeaderStyle="{StaticResource dgHeaderStyle}" > I have defined styles in my App.xaml file: <Style x:Key="dgStyle" TargetType="data:DataGrid"> <Setter Property="Background" Value="White"/> <Setter Property="RowBackground" Value="#FFF6F6F6"/> <Setter Property="Foreground" Value="#FF3A3B3B"/> <Setter Property="FontFamily" Value="Verdana"/> <Setter Property="FontSize" Value="13.333"/> </Style> EXCEPTION-- Invalid attribute value data:DataGrid for property TargetType. [Line: 61 Position: 43]

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• Changing content of HTMLDocument displayed in a JTextPane

  - by kayahr

  I'm displaying some tables as HTML code (rendered by a Freemarker template) with a JTextPane. I also have some HTML links in this HTML output which can be used to interact with the values of the table (For example "Delete a row" and stuff like this). Currently I always recreate the whole HTML output on each change and replace the whole document in the JTextPane with the new one. This is getting really slow and the JTextPane always changes the scroll position when I do this. Is it possible to change only parts of the HTML code during runtime without replacing the whole document? In a real browser I would use the DOM and do something like document.getElementById("price").innerHTML = "$123.44". Is something like that possible with the HTMLDocument in a JTextPane?

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• python read utf8 text file problem

  - by cpps

  I have a problem with python about reading and print utf8 text file. I have a test.txt in utf8 encoding without BOM. This file has two characters in it: ?? The first character "?" is Chinese and the second "?" is Japanese. Now, When I use Ulipad (a python editor) to run the following code to read the txt file, and print these two characters. import codecs infile = "C:\\test.txt" f = codecs.open(infile, "r", "utf-8") s = f.read() print(s) I got this error, "UnicodeEncodeError: 'cp950' codec can't encode character '\u58f0' in position 1: illegal multibyte sequence" I found it caused from the second character "?" . But when I use the same code to test in python default GUI IDLE, it works to print the two characters with no error. So, how can I fix the problem. My running environment is python 3.1 , windows xp traditional Chinese.

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• Scraped HTML is not written at the beginning of text file.

  - by karikari

  Currently, I'm scraping the HTML code of a page, and writing it to a text file. My problem is, why must there be empty spaces or empty lines at the beginning? The HTML codes written to the txt file do not seem to start at the beginning of the text file. This means that the '<' is not located at the position 0 of the txt file. After a few runs, my HTML is always written a few lines down inside the text file. Can anyone tell me why?

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• Getting started in Mac Development; No Mac.... What Do?!

  - by Andrew Bolster

  Hi folks, With all the RDF et al around King Jobs' newest glass beermat, I'm getting the feeling that its a good time to add the 'iphone/ipad developer' string to my bow. One problem (two if you count not being in a financial position to slap down $1000+ for a mac) ; I am a PC head, specifically a Linux-head, and have no regular access to a Mac platform to develop on. I cannot see any way of getting my hands on iSDK without being on a Mac, (but have been known to be wrong) How hopeless is my plight and where can I go from here?

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• Blackberry custom slideshow-style BitmapField manager

  - by Diego Tori

  Right now, I'm trying to figure out how to implement the following: Suppose I have a custom Manager that has about 10 or so BitmapFields layed out in a horizontal manner (similar to a slideshow contained in a HFM ) . What I want to achieve is to be able to move the image HFM via touchEvent horizontally, where a BitmapField would take focus on the left-hand side of the custom Manager. In other words, will I have to give a value to setHorizontalScroll and if so, is it a matter of just incrementing that value when the user makes a left or right touch event. Also, how can I get the focus of a Field within a given position on the screen (i.e. the left-most Field on the HFM) when the HFM is scrolling sideways via touchEvent?

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• python unichr problem

  - by jacob

  I've got some problem with unichr() on my server. Please see below: On my server (Ubuntu 9.04): >>> print unichr(255) Traceback (most recent call last): File "<stdin>", line 1, in <module> UnicodeEncodeError: 'ascii' codec can't encode character u'\xff' in position 0: ordinal not in range(128) On my desktop (Ubuntu 9.10): >>> print unichr(255) ÿ I'm fairly new to python so I don't know how to solve this. Anyone care to help? Thanks.

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• Display Img and Div inline - it's not rendered inline

  - by user359372

  In order to follow correct web standards, I've tried to layout image and div inline. In orde to achieve that - I've used display:inline property. But then I experienced the following issue: image renders from the center line, and div doesn't respect height parameter set to it. I've tried using line-height parameter, but that didn't give any useful results. I've also tried various combinations with setting margin/padding to some values or to auto, or replacing div with span, or wrapping img and div with additional divs. I've managed to achieve desired result by using position:absolute, but that doesn't help in cases where I want to use centered/relative positioning of the whole component... Any clues or ideas or troubleshooting hints? Please find the html example below: Test Page Some text that should be displayed in the center/middle of the div 123   Some text that should be displayed in the center/middle of the div

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