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  • javascript hide/unhide, but want an arrow to point down/up on hide/unhide

    - by user1305810
    I have a simple hide/unhide div section using simple JavaScript. I need to have an arrow image, which will toggle the content visibility when clicked, and I want the little arrow to toggle between right/down positions when the content is hidden and unhidden. HTML content: <a href="javascript:showOrHide();"><img src="Image_Files/Copyright.png" alt="BioProtege Inc" border="0" /></a> <img src="Image_Files/Copyright_Arrow_Hidden.png" alt="Arrow" border="0" /> <div id="showorhide"> Copyright 2012+ BioProtege-Inc.Net | LG Fresh Designz <br /> Contact Us @ [email protected] </div> JavaScript content: function showOrHide() { var div = document.getElementById("showorhide"); if (div.style.display == "block") { div.style.display = "none"; } else { div.style.display = "block"; } }

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  • Making a sprite always point to another sprite in XNA

    - by Whitey
    I have a player sprite (playerTexture) and a crosshair sprite (crossTexture) in my game. I need to make the player sprite always face towards the crosshair. Does anyone know how to do this? I have tried doing it myself but the math involved boggles my mind. I know there's a rotation parameter in the spriteBatch.Draw() method but I'm unsure how to use it. Thanks!

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  • What is the point of JComboBox's getSelectedItem()?

    - by Chris Cooper
    I just read the JavaDoc for JComboBox (I promise I have a life... I wasn't reading through for fun. =P), and I think the problems I'm having with my program can be attributed to the getSelectedItem() method. The documentation says: Returns the current selected item. If the combo box is editable, then this value may not have been added to the combo box with addItem, insertItemAt or the data constructors. If you can't get values that were added with those methods or with the constructor, of what use is the method? And how can I get the value from an "editable" JComboBox? Link to JavaDoc: http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/JComboBox.html#getSelectedItem()

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  • Significant figures in the decimal module

    - by Jason Baker
    So I've decided to try to solve my physics homework by writing some python scripts to solve problems for me. One problem that I'm running into is that significant figures don't always seem to come out properly. For example this handles significant figures properly: from decimal import Decimal >>> Decimal('1.0') + Decimal('2.0') Decimal("3.0") But this doesn't: >>> Decimal('1.00') / Decimal('3.00') Decimal("0.3333333333333333333333333333") So two questions: Am I right that this isn't the expected amount of significant digits, or do I need to brush up on significant digit math? Is there any way to do this without having to set the decimal precision manually? Granted, I'm sure I can use numpy to do this, but I just want to know if there's a way to do this with the decimal module out of curiosity.

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  • What's the point of some of shoulda's macros?

    - by ryeguy
    I think shoulda is really neat, but what I don't understand is why some of the macros exist, such as: should_validate_uniqueness_of :title should_validate_presence_of :body, :message => /wtf/ should_validate_presence_of :title should_validate_numericality_of :user_id I'm relatively new to testing, but what purpose do these serve? They're almost an exact mirror of the same validations that happen in the model. For example, what exactly do you accomplish by going into your model and writing validates_uniqueness_of :title and then writing a test that says should_validate_uniqueness_of :title?

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  • Doing 64 bit manipulation using 32 bit data in Fixed point arithmetic using C.

    - by Viks
    Hi, I am stuck with a problem. I am working on a hardware which only does support 32 bit operations. sizeof(int64_t) is 4. Sizeof(int) is 4. and I am porting an application which assumes size of int64_t to be 8 bytes. The problem is it has this macro BIG_MULL(a,b) ( (int64_t)(a) * (int64_t)(b) 23) The result is always a 32 bit integer but since my system doesn't support 64 bit operation, it always return me the LSB of the operation, rounding of all the results making my system crash. Can someone help me out? Regards, Vikas Gupta

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  • Whats the point of STL?

    - by Jonathan D
    I've been programming c++ for about a year now and when i'm looking about i see lots of references to STL. Can some one please tell me what it does? and the advantages and disadvantageous of it? thanks

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  • How can I encode four unsigned bytes (0-255) to a float and back again using HLSL?

    - by Statement
    Hello! I am facing a task where one of my hlsl shaders require multiple texture lookups per pixel. My 2d textures are fixed to 256*256, so two bytes should be sufficient to address any given texel given this constraint. My idea is then to put two xy-coordinates in each float, giving me eight xy-coordinates in pixel space when packed in a Vector4 format image. These eight coordinates are then used to sample another texture(s). The reason for doing this is to save graphics memory and an attempt to optimize processing time, since then I don't require multiple texture lookups. By the way: Does anyone know if encoding/decoding 16 bytes from/to 4 floats using 1 sampling is slower than 4 samplings with unencoded data?

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  • Grails/Compass question - How can I change the compqass Connection to point to a different directory

    - by ombud
    Hi, I use the Searchable plugin with Grails I have the need to change the directory to which Compass points to, depending upon a UI choice by the user. Normally, this value is set in the compassConnection variable of the searchable map in grails-app/conf/Searchable.groovy, like so, and gets called at app startup time: searchable { compassConnection = new File( "/path/to/index/file/directory" ).absolutePath ... } To do what I need to do, I think that I need to get a handle into the compass config variable and then call config.setConnection("/new/path/to/index/dir") I don't know how I can get a reference to the config compass variable Am I right in assuming that I need to call setConnection(String) only, or is(are) there any other step(s) I need to take? Really appreciate any help that I can get, Shailen

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  • What Determines the Default Setting of the x87 FPU Control Word?

    - by Rick Regan
    What determines the default setting of the x87 FPU control word -- specifically, the precision control field? Does the compiler set it based on the target processor? Is there a compiler option to change it? Using Microsoft Visual C++ 2008 Express Edition on an Intel Core Duo processor, the default setting for the precision control field is "01b", meaning double (53 bit) precision. I'm wondering -- why is the default not "11"b, or extended (64 bit) precision? (I know I can change it using _controlfp.)

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  • Getting hardware floating point with android NDK

    - by Goz
    Hi All, I've begun playing with the android NDK. One of the things I've just learnt is about creating an application.mk file to specify the armv7 abi. I'm building the san-angeles example with the following parameters. APP_MODULES := sanangeles APP_PROJECT_PATH := $(call my-dir)/../ APP_OPTIM := release APP_ABI := armeabi-v7a However this seems to run at exactly the same speed as it did before (ie badly). Am I just GL limited and not CPU limited or is something wrong here? I have noticed when I compile that I get the following command line options emitted: -march=armv7-a -mfloat-abi=softfp -mfpu=vfp -mthumb The thing that worries me there is the "softfp". There IS mention of the v7 abi, the VFP fpu stuff and I'm guessing the "thumb" refers to the "thumb-2" instructions (Though I don't know what exactly these are). However that "softfp" does concern me. Shouldn't it be "hardfp"? Anyone got any ideas on these questions? I think I'm probably about ready to start implementing some GL ES 2.0 code for my HTC Desire but I'd like to make sure I'm getting the best possible speed out of it :) Cheers in advance!

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  • WPF Best point to udpate a progress bar from backgorundworker

    - by toni
    Hi! I have a task that takes a long time executing. In order to inform about the progress to the user I have a progress bar that I update inside DoWork but I would like anybody tells me if it is the best way to update the progress bar. I have heard that there is a reportprogress event handler but I am confused because I don't know what is the utility of the ReportProgress. Thanks.

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  • Access 2003 - Embedded ppt slide or Excel Spreadsheet in a form, how do I communicate?

    - by Justin
    So if I was to take a an access form, and embed either an excel spreadsheet into it, or a powerpoint slide/pres, how would I reference it in VBA code? So I know I have to set the libraries, name the frame of the OLE object, and use applicable syntax to whatever I want to do, with whatever I stick in the form, however the only things I have ever done with excel and/or powerpoint is automate the opening of a seperate window/application from access, not within the access form....so I am not sure?? if I said its a new Excel.Application, then set xls = to (the ss in the file, and not some file path of another excel file somewhere)? does that make sense?

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  • php calculate float HELP!!

    - by apis17
    help!! i have weird math calculation here. hope someone will explain. $a = 1.85/100; $b = 1.5/100; $c = 1.1/100; $d = 0.4/100; $e = 0.4/100; $f = 0.4/100; $g = 0.4/100; $h = $a + $b + $c + $d + $e + $f + $g; echo $h*100 ."<br>"; $i = $h-$a; $i = $i-$b; $i = $i-$c; $i = $i-$d; $i = $i-$e; $i = $i-$f; $i = $i-$g; echo $i; last $i value should be 0 but it returns 6.93889390391E-18

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  • Fast sign in C++ float...are there any platform dependencies in this code?

    - by Patrick Niedzielski
    Searching online, I have found the following routine for calculating the sign of a float in IEEE format. This could easily be extended to a double, too. // returns 1.0f for positive floats, -1.0f for negative floats, 0.0f for zero inline float fast_sign(float f) { if (((int&)f & 0x7FFFFFFF)==0) return 0.f; // test exponent & mantissa bits: is input zero? else { float r = 1.0f; (int&)r |= ((int&)f & 0x80000000); // mask sign bit in f, set it in r if necessary return r; } } (Source: ``Fast sign for 32 bit floats'', Peter Schoffhauzer) I am weary to use this routine, though, because of the bit binary operations. I need my code to work on machines with different byte orders, but I am not sure how much of this the IEEE standard specifies, as I couldn't find the most recent version, published this year. Can someone tell me if this will work, regardless of the byte order of the machine? Thanks, Patrick

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  • what POIs (Point of Interests) DB can I use for a commercial app

    - by Ellie
    Hi, I need a POI database for a startup project I am working on - it will be a free basic version and a premium paid for version in the sense that user will pay a monthly subscription. I would like to use foursquare type checkin to places and plancast type functionality to search for places (one-line search). Ie I need to: - perform a search for POIs around a location - associate users to that POI, with a time stamp - allow users to add own POIs - provide free-text search for POIs (a la google one-line search) Google API allows great search, but I understand there are limits in number of requests that can be done? This would prevent scaling, and may result in application breaking when too many users. Also what does google T&C say about using this in a paid for service? Openstreetmap I understand does not have these contstraints, but do they also provide a good one-line search type API? Or how could I solve this? Many thanks for any advice, Ellie

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  • Compare sign of two doubles

    - by bobobobo
    What's the fastest way to compare sign on a double? I know that a double has a "sign bit" but I'm not sure if the way I'm "looking for it" in its binary rep is a good idea or not. Barring "portability" issues, can someone tell me what's going on with this code in MSVC++? #include <stdio.h> int main() { double z = 5.0 ; __int64 bitSign ; __int64 *ptr ; ptr = (__int64*)&z ; for( __int64 sh = 0 ; sh < 65 ; sh++ ) { bitSign = 1L << sh ; // Weird. it doesn't do 1. printf( "Bit# %d (%llx): %lld\n", sh, bitSign, ( (*ptr) & bitSign) ) ; } } First, why is starting at bit 32, even though I only shifted by one bit? Second, is it ok for me to check the 64th bit of a double to check its sign on MSVC++? Or is there a more preferred way?

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  • Multiple addon domains to point to main domain filesystem

    - by Miky
    Hi, I have a main domain (www.mysite.com). All the files (source code) are stored within the public_html directory. I added one addon domain (www.mysite.net). By default it points to public_html/mysite.net/ directory. Is it possible that it reads all the files (source code) from public_html directory itself. Actually I am planning to have multiple addon domains, the source code for all will be same.

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  • rotate an image aroound a point

    - by Girish
    Hi all, I have an image which is of rectangular dimension, eg 30 x 60 pixels I want to rotate this image around the bottom center of the image, i.e i want to set the pivot in the above example as (15, 60 )pixel. I am using a drawble and matrix to get this done, whatever i try i always end up rotating around center of the image. Code is : Bitmap bitmapOrg = BitmapFactory.decodeFile("/sdcard/DCIM/2010-06-01_15-32-42_821.jpg"); // float angle = (angle + 10.0f)%360.0f; if(null !=bitmapOrg) { int width = bitmapOrg.getWidth(); int height = bitmapOrg.getHeight(); int newWidth = 15; int newHeight = 15; // calculate the scale - in this case = 0.4f float scaleWidth = ((float) newWidth) / width; float scaleHeight = ((float) newHeight) / height; /* Canvas c = new Canvas(bitmapOrg); float px = ; float py; c.rotate(angle, px, py)*/ // createa matrix for the manipulation Matrix matrix = new Matrix(); // resize the bit map matrix.postScale(scaleWidth, scaleHeight); // rotate the Bitmap // matrix.postRotate(45); // recreate the new Bitmap Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0, width, height, matrix, true); // make a Drawable from Bitmap to allow to set the BitMap // to the ImageView, ImageButton or what ever BitmapDrawable bmd = new BitmapDrawable(resizedBitmap); ImageView imageView = new ImageView(this); // set the Drawable on the ImageView imageView.setImageDrawable(bmd); // center the Image imageView.setScaleType(ScaleType.CENTER); // imageView.layout(100, 300, 0, 0); // linLayout.addView(imageView); // add ImageView to the Layout linLayout.addView(imageView, new AbsoluteLayout.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 10, 30 ) ); can anyone let me know how to get this rectified?

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  • DataContractJsonSerializer set value extension point

    - by svinto
    using System.IO; using System.Runtime.Serialization; using System.Runtime.Serialization.Json; using System.Text; namespace ConsoleApplication1 { internal class Program { private static void Main(string[] args) { var pony = new Pony(); var serializer = new DataContractJsonSerializer(pony.GetType()); var example = @"{""Foo"":null}"; var stream = new MemoryStream(Encoding.UTF8.GetBytes(example.ToCharArray())); stream.Position = 0; pony = (Pony) serializer.ReadObject(stream); // The previous line throws an exception. } } [DataContract] public class Pony { [DataMember] private int Foo { get; set; } } } Sometimes the serialization throws a casting error on Int32s being set to null. Is there any way to hook into the Json-serializer?

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