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  • How to calculate a point with an given center, angle and radius?

    - by mystify
    In this SO question, someone asked for calculating an angle from three points. I need to do the opposite thing. I want to draw a clock, and I have tiny tick images. An art dude made 60 of them, each with an individual and accurate shadow. So there are 60 distinct images at 10x10 points in size, already correctly rotated in the center of that square. So every 6 degrees one tick image has to be placed. I would just need to calculate the x/y coordinate based on a center point, an radius and an angle. So I have: an center point an radius an angle Is there an easy way to calculate the x/y coordinate with this? Maybe cocoa-touch already has a useful function or method for this?

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  • Given an instance of a Ruby object, how do I get its metaclass?

    - by Stanislaus Wernstrom
    Normally, I might get the metaclass for a particular instance of a Ruby object with something like this: class C def metaclass class << self; self; end end end # This is this instance's metaclass. C.new.metaclass => #<Class:#<C:0x01234567>> # Successive invocations will have different metaclasses, # since they're different instances. C.new.metaclass => #<Class:#<C:0x01233...>> C.new.metaclass => #<Class:#<C:0x01232...>> C.new.metaclass => #<Class:#<C:0x01231...>> Let's say I just want to know the metaclass of an arbitrary object instance obj of an arbitrary class, and I don't want to define a metaclass (or similar) method on the class of obj. Is there a way to do that?

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  • BCB: how to get the (approximate) width of a character in a given TFont?

    - by mawg
    It's a TMemo, not that that should make any difference. Googling suggests that I can use Canvas->TextWidth() but those are Delphi examples and BCB doesn't seem to offer this property. I really want something analogous to memo->Font->Height for width. I realize that not all fonts are fixed width, so a good estimate will do. All that I need is to take the width of a TMemo in pixels and make a reasonable guess at how many characters of the current font it will hold. Of course, if I really want to be lazy, I can just google for the average height/width ratio, since height is known. Remember, an approximation is good enough for me if it is tricky to get exact. http://www.plainlanguagenetwork.org/type/utbo211.htm says, " A width to height ratio of 3:5 (0.6) is recommended for most applications"

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  • Given n report thumbnails, how do I create a Flex Effect that zooms into the selected report?

    - by Luis B
    I am worried about performance issues. If I just render all n reports zoomed out, then that will cost me in performance. Even animating a zoomed out report to zoom in, will also cost me in performance because it has to recalculate all the UIComponent's of my report as it transitions from zoomed out to zoomed in-to view. Any solutions/suggestions welcome. Let me know if you need clarification.

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  • How can I resolve naming conflict in given precompiled libraries?

    - by asm
    I'm linking two different libraries that have functions with exactly same name (it's opengl32.lib and libgles_cm.lib - OpenGL ES emulation under Win32 platform), and I want to be able to specify, which version I'm calling. I'm porting a game to OpenGL ES, and what I want to achieve, is a split-screen rendering, where left side is an OpenGL version, and right side is a ES version. To produce the same result, they will recieve slightly different calls, and I'll be able to visually compare them, effectively finding visual artifacts. It worked perfectly with OpenGL/DirectX at the same window, but now the problem is that both versions imports the functions with the same name, like glDrawArrays, and only one version is imported. Unfortunately, I don't have sources of any of that libraries. Is there a way to... I dont' know, wrap one library into additional namespace before linking (with calls like ES::glDrawArrays), somehow rename some of functions or do anything else? I'm using microsoft compiler now, but if there will be solution with another one (GCC/ICC), I'll switch to it.

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  • PHP: find 2 or more numbers from a list of N numbers that can add up towards a given ammount

    - by Splash
    Hi Guys, I am trying to create a little php script that can make my life a bit easier. Basically, I am going to have 21 text fields on a page where I am going to input 20 different numbers. In the last field I will enter a number let's call it the TOTAL AMMOUNT. All I want the script to do is to point out which numbers from the 20 fields added up will come up to TOTAL AMMOUNT. Example: field1= 25.23 field2= 34.45 field3= 56.67 field4= 63.54 field5= 87.54 .... field20= 4.2 Total Ammount= 81.90 Output: field1+fields3=81.90 Some of the fields might have 0 as value because sometimes I only need to enter 5-15 fields and the maximum will be 20. If someone can help me out with the php code for this, will be greatly appreciated.

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  • How to get the required value displayed from the given array?

    - by Parth
    From below array i want the value of "_sql" to be displayed or we can I want to echo the "_sql" value, so what should be the syntax to display it in PHP code? JTableMenu Object ( [lft] => [rgt] => [home] => [_tbl] => #__menu [_tbl_key] => id [_db] => JDatabaseMySQL Object ( [name] => mysql [_nullDate] => 0000-00-00 00:00:00 [_nameQuote] => ` [_sql] => INSERT INTO `jos_menu` ( `id`,`menutype`,`name`,`alias`,`link`,`type`,`published`,`componentid`,`parent`,`ordering`,`checked_out`,`checked_out_time`,`brow............ [_errorNum] => 0 ) )

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  • How can I not render a button in my view if a given property off my model has no value?

    - by Lee Warner
    I'm new to web development. In my view, I want to conditionally show a button if Model.TemplateLocation (which is a string) is not null or empty. Below is the code that is rendering the button currently: <div class="WPButton MyButton"> <%=Html.ActionLink(Model.TemplateLinkName, "DownloadTemplate", "ExternalData", new ArgsDownloadTemplate { Path = Model.TemplateLocation, FileName = Model.TemplateFileNameForDownload }, new{})%> </div> Can I wrap some C# code in the <% %'s to test for Model.TemplateLocations value before I render that? I was told to look into @style = "display:none" somehow. Could that be what I need?

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  • Folders and its files do get copied.. pls help me in given code..

    - by OM The Eternity
    I have a joomla folder, and i have a script which has to copy the complete joomla folder to another new folder..below is the code which copies only the files contain in the main folder but NOT the other directories existing in the joomla folder, I know that i have to plcae some check for dir_exist function and create it if do not exist.. also I want this code to perform a function to overrite the previously existing files and folders.. how can i accomplish thisss?????? <?php $source = '/var/www/html/pranav_test/'; $destination = '/var/www/html/parth/'; $sourceFiles = glob($source . '*'); foreach($sourceFiles as $file) { $baseFile = basename($file); if (file_exists($destination . $baseFile)) { $originalHash = md5_file($file); $destinationHash = md5_file($destination . $baseFile); if ($originalHash === $destinationHash) { continue; } } copy($file, $destination . $baseFile); } ?> Thanks to @alex who helped me to get the code... But I need more support pls help...

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  • How to generate random strings that match a given regexp?

    - by Pies
    Duplicate: Random string that matches a regexp No, it isn't. I'm looking for an easy and universal method, one that I could actually implement. That's far more difficult than randomly generating passwords. I want to create an application that takes a regular expression, and shows 10 randomly generated strings that match that expression. It's supposed to help people better understand their regexps, and to decide i.e. if they're secure enough for validation purposes. Does anyone know of an easy way to do that? One obvious solution would be to write (or steal) a regexp parser, but that seems really over my head. I repeat, I'm looking for an easy and universal way to do that. Edit: Brute force approach is out of the question. Assuming the random strings would just be [a-z0-9]{10} and 1 million iterations per second, it would take 65 years to iterate trough the space of all 10-char strings.

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  • Is there an API available that, given text, returns a list of companies with their ticker symbols?

    - by smo7002
    Ideally I would love to extract exactly what Google Finance's Get Quote functionality does with the predictive search. That's really all that I'm looking for. I don't want to store the data, I just want to be able to search company names/ticker symbols so that I can get the correct symbol. I already have specialized quote functionality in place. Also, the search functionality needs to be intuitive. I've looked through Google Finance API but haven't seen exactly what it is that I'm looking for. Any suggestions are appreciated. Thanks

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