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  • Unable to Click a row and call javascript function?

    - by user2807977
    I'm unable to trigger $(this).toggleClass('selected'); for content table. When I debug it just skip this event. How can I make sure its being selected? $('#contentChangesTable tr') .filter(':has(:checkbox:checked)') .addClass('selected') .end() .click(function (event) { $(this).toggleClass('selected'); if (event.target.type !== 'checkbox') { $(':checkbox', this).attr('checked', function () { return !this.checked; }); } });

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  • Implementing IEnumeralbe on Non-Listed Items

    - by Stacey
    I have a class that contains a static number of objects. This class needs to be frequently 'compared' to other classes that will be simple List objects. public partial class Sheet { public Item X{ get; set; } public Item Y{ get; set; } public Item Z{ get; set; } } the items are obviously not going to be "X" "Y" "Z", those are just generic names for example. The problem is that due to the nature of what needs to be done, a List won't work; even though everything in here is going to be of type Item. It is like a checklist of very specific things that has to be tested against in both code and runtime. This works all fine and well; it isn't my issue. My issue is iterating it. For instance I want to do the following... List<Item> UncheckedItems = // Repository Logic Here. UncheckedItems contains all available items; and the CheckedItems is the Sheet class instance. CheckedItems will contain items that were moved from Unchecked to Checked; however due to the nature of the storage system, items moved to Checked CANNOT be REMOVED from Unchecked. I simply want to iterate through "Checked" and remove anything from the list in Unchecked that is already in "Checked". So naturally, that would go like this with a normal list. foreach(Item item in Unchecked) { if( Checked.Contains(item) ) Unchecked.Remove( item ); } But since "Sheet" is not a 'List', I cannot do that. So I wanted to implement IEnumerable so that I could. Any suggestions? I've never implemented IEnumerable directly before and I'm pretty confused as to where to begin.

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  • Using jquery to change checkbox status

    - by Jeff
    Hi everyone! I have a list of items that have checkboxes associated with them, and the items are beneath a list header, which also has a checkbox(for db purposes only) which is actually hidden from view. I need to make it so that if any of the checkboxes beneath the header is checked, then the header checkbox is checked as well. BUT I also need to make it so that if all of the checkboxes are unchecked, then the header one is unchecked...how hard is this going to be? This is how I have it setup now: if($('.childCheckBox').is(":checked")){ $('#parentBox').attr('checked', true); } Now I am thinking that if I were to do something where I add an else if clause: else if($('.proBox2').is(not)(":checked"){ alert("uncheck parent"); } But I don't know the correct syntax for is-not, or isn't, or even if there is anything that will do that. Are there any thoughts out there? I need the box to check if one is selected and uncheck if none are selected. Thanks!!

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  • select (or click) specific radiobutton using jQuery

    - by Oleg Babanov
    I am trying to make specific radiobutton checked on page load and tried a lot of ways, but no one worked for me. This is a part of orderform on my webstore. <input type="radio" name="sPaymentCarrier" id="pC_2-1" value="1;2;0.00" onclick="countCarrierPrice( this )" /> <label for="pC_2-1">0</label> Actually this radiobutton is the only on radiobutton on page, and it must be checked to let user make order. I tried $(function() { var $radios = $('input:radio[name=sPaymentCarrier]'); if($radios.is(':checked') === false) { $radios.filter('[value=1;2;0.00]').attr('checked', true); } }); and $('input:radio[name="sPaymentCarrier"]').filter('[value="1;2;0.00"]').attr('checked', true); but none of these ways worked. Also I tried a lot of other codes, but when I refreshed page I still saw this button unchecked. I guess maybe I have to set up jquery click on this button instead of select, but actually I cannot make this work. Any help is appreciated!

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  • jquery get selected dropdownlist text

    - by mike
    Hi How can i get the selected text on a dropdowm, ive seen examples of how to do eg $('select option:selected').text() but looking at my code below, how can i modify it to work as the line alert($(this).parent().text()); gets all the list items as opposed to selected text $(document).ready(function () { $('.mutuallyexclusive').live("click", function () { checkedState = $(this).attr('checked'); $('.mutuallyexclusive:checked').each(function () { $(this).attr('checked', false); }); $(this).attr('checked', checkedState); alert($(this).parent().text()); }); });

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  • Share iTunes Library from Nas across several clients. How in Windows

    - by Mych
    I found this article http://gigaom.com/apple/one-itunes-library-on-multiple-computers/ which describes sharing a single library with multiple clients. Unfortunately this article is for Macs and I use Windows. The article mentions 3 jobs that need to be completed.' A) - pointing all clients to the location of the Library. This is understandable and I can replicate using windows clients. B) Universal Library Set-up. This mentions holing the option key and double click iTunes icon. This is so you can create the index at a specific location C) Point clients to index. Again this mentions Option double click. What is the Windows equivalent to option double click iTunes?

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  • odd behavior when checking if radio button selected in jQuery

    - by RememberME
    I had the following check in my jQuery which I thought was working fine to see if a radio button was checked. if ($("input[@name='companyType']:checked").attr('id') == "primary") { ... } Here's the radiobuttons: <p> <label>Company Type:</label> <label for="primary"><input onclick="javascript: $('#sec').hide('slow');$('#primary_company').find('option:first').attr('selected','selected');" type="radio" name="companyType" id="primary" checked />Primary</label> <label for="secondary"><input onclick="javascript: $('#sec').show('slow');" type="radio" name="companyType" id="secondary" />Subsidiary</label> </p> Then, it suddenly stopped working (or so I thought). I did some debugging and finally realized that it was returning an id of "approved_status". Elsewhere on my form I have a checkbox called "approved_status". I realized that when I originally tested this, I must have testing it on records where approved_status is false. And, now most of my approved_statuses are true/checked. I changed the code to this: var id = $("input:radio[@name='companyType']:checked").attr('id'); alert(id); if (id == "primary") { And it's now properly returning "primary" or "secondary" as the id. So, it is working, but it seems that it's not checking the name at all and now just checking radio buttons. I just want to know for future use, what's wrong with the original code b/c I can see possibly having 2 different radio sets on a page and then my new fix probably wouldn't work. Thanks!

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  • Help with validation rules

    - by George Garman
    I am trying to figure out how to validate a section of a form using php. If at least one of value 1-5 is checked, then at least one of value A-E must be checked. Value's A-E cannot be allowed without at least one of 1-5 being checked. Multiple values in each section can be selected, as long as there is at least one value in each section checked. I have tried individual IF statements and arrays without success. Does anyone have any suggestions or examples? I am missing something and I am certain it is pretty obvious, right in my face.

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  • why is my intent not useful?

    - by user1634887
    This is my first to ask here. I write the code for a Broadcast A start another Broadcast B. But the Broadcast B didn't get the intent's value. Broadcast A:get the sms contain message and start B public void onReceive(Context context, Intent intent) { Object[] pdus=(Object[])intent.getExtras().get("pdus"); for(Object pdu:pdus) { byte[] date=(byte[])pdu; SmsMessage message=SmsMessage.createFromPdu(date); String sender=message.getOriginatingAddress(); String body=message.getMessageBody(); if(sender.equals(AppUtil.herPhone)&&body.regionMatches(0, AppUtil.herSmsText, 0, 18)) { Toast.makeText(context, body, Toast.LENGTH_LONG).show(); String [] bodyArray=body.split(" "); String longitude=bodyArray[1]; String latitude=bodyArray[2]; **Intent uiIntent=new Intent(); Bundle bundle=new Bundle(); bundle.putString("longitude", longitude); bundle.putString("latitude", latitude); uiIntent.putExtras(bundle); uiIntent.setAction("android.janmac.location"); context.sendBroadcast(uiIntent);** abortBroadcast(); } } } Boardcast B: it nest in an Activity. register: button.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { AppUtil.SendMessage(MainActivity.this); uiReceiver=new UIReceiver(); IntentFilter filter=new IntentFilter(); filter.addAction("android.janmac.location"); registerReceiver(uiReceiver, filter); } }); extend: private class UIReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Log.v("location","uireceiver????!"); **Bundle bundle=new Bundle(); bundle=intent.getExtras(); herLongitude=Double.valueOf(bundle.getString("longitude")); herLatitude=Double.valueOf(bundle.getString("latitude"));** } } but the bundle couldn't get any values. here is log: 08-30 11:17:40.494: D/AndroidRuntime(2359): Shutting down VM 08-30 11:17:40.514: W/dalvikvm(2359): threadid=1: thread exiting with uncaught exception (group=0x40018560) 08-30 11:17:40.544: E/AndroidRuntime(2359): FATAL EXCEPTION: main 08-30 11:17:40.544: E/AndroidRuntime(2359): java.lang.RuntimeException: Error receiving broadcast Intent { act=android.janmac.location (has extras) } in com.example.locationclient.MainActivity$UIReceiver@40513690 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:722) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.os.Handler.handleCallback(Handler.java:587) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.os.Handler.dispatchMessage(Handler.java:92) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.os.Looper.loop(Looper.java:130) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.app.ActivityThread.main(ActivityThread.java:3835) 08-30 11:17:40.544: E/AndroidRuntime(2359): at java.lang.reflect.Method.invokeNative(Native Method) 08-30 11:17:40.544: E/AndroidRuntime(2359): at java.lang.reflect.Method.invoke(Method.java:507) 08-30 11:17:40.544: E/AndroidRuntime(2359): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864) 08-30 11:17:40.544: E/AndroidRuntime(2359): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622) 08-30 11:17:40.544: E/AndroidRuntime(2359): at dalvik.system.NativeStart.main(Native Method) 08-30 11:17:40.544: E/AndroidRuntime(2359): Caused by: java.lang.NumberFormatException 08-30 11:17:40.544: E/AndroidRuntime(2359): at org.apache.harmony.luni.util.FloatingPointParser.parseDblImpl(Native Method) 08-30 11:17:40.544: E/AndroidRuntime(2359): at org.apache.harmony.luni.util.FloatingPointParser.parseDouble(FloatingPointParser.java:283) 08-30 11:17:40.544: E/AndroidRuntime(2359): at java.lang.Double.parseDouble(Double.java:318) 08-30 11:17:40.544: E/AndroidRuntime(2359): at java.lang.Double.valueOf(Double.java:356) 08-30 11:17:40.544: E/AndroidRuntime(2359): at com.example.locationclient.MainActivity$UIReceiver.onReceive(MainActivity.java:231) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:709) 08-30 11:17:40.544: E/AndroidRuntime(2359): ... 9 more enter code here

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  • Checkbox - in Javascript

    - by smiley
    I am working on Edit screen where I am pulling out value from db to check if the checkbox is checked or not. If it is unchecked, it should deselect the checkbox and other controls of this checkbox. In my case the js works perfectly fine. That is if my previous screen has checkbox unchecked, edit screen disables all the values for this checkbox. But it still shows the checkbox is checked in UI(though it is actually checked). Something is wrong with my html code. Can someone please let me know where /how should i modify to display if my checkbox is unchecked? <%chkStatus=list.getCheckbox(); if (chkStatus == null) { chkStatus = ""; } %> <input id="chkbox" type="checkbox" name="chkbox" checked="<%=chkStatus%>" onchange="javascript:enableDisableTextBox();">

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  • How to show the Birthdate in mm/dd/yyyy format if year is separated from it?

    - by Sandipan
    I have a checkbox Birthdate which shows the mm/dd only.And another checkbox below it that will show the year only, and will be visible if Birthdate checkbox is checked. I want to show that if Birthdate checkbox is checked and the value is stored in the database,then it will show only the mm/dd only. And if year checkbox is checked ,and its value is stored in the database, then it will show the mm/dd/year

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  • jQuery/Javascript problem with IE

    - by Shadyn
    I have two radio buttons each with a unique ID. When one is clicked, I would like to add $10 to a total. When the other is clicked, we go back to the original total price. My jquery looks like this: function check_ceu() { var price = <%= conference_price %>; if($('#ceu_yes').is(':checked')){ $('#total').val(parseFloat(price) + 10) } else{ $('#total').val(price) } } I have this function bound to document.ready (for page refreshes) and also the onchange handler of the radio buttons. In FF and Chrome this works fine. In IE, when the radio button with ID of "ceu_yes" is checked nothing happens, then when clicking back to the other radio button, 10 is added. So in essence, IE has the checkbox functionality reversed. Below is my code for the buttons: <input type="radio" name="ceu" id="ceu_yes" value="1" onchange="check_ceu()" /> $10 <input type="radio" name="ceu" id="ceu_no" value="0" checked="checked" onchange="check_ceu()" /> No, thank you Any ideas on this?

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  • Setting CSS attributes on Change using jQuery

    - by Nick B
    I want to change css visibility and display attributes using jQuery on click when the state of another div's visibility attribute changes. (Many apologies for the obfuscated markup, but needing to manipulate someone else's construction): There are four instances of [data-label="Checkbox"] [data-label="Checked"] in this page. I want to set [data-label="trash"] and [data-label="Sort Options"] to visibility: visible; display: [empty value] when any of the [data-label="Checkbox"] [data-label="Checked"]'s attributes changes to 'visibility', 'visible'. Else, if none of [data-label="Checkbox"] [data-label="Checked"]'s have the attribute 'visibility', 'visible', I want to set [data-label="trash"] and [data-label="Sort Options"] back to their initial states: display: none; visibility: hidden;. Here's the markup: <div data-label="Sort Options" style="display: none; visibility: hidden;"> <div data-label="trash" style="display: none; visibility: hidden;"></div> </div> <div data-label="Checkbox"> <div data-label="Unchecked"></div> <div data-label="Checked" style="display: none; visibility: hidden;"></div> </div> Here is what I have tried unsuccessfully: $('[data-label="Checkbox"]').click(function() { if ('[data-label="Checkbox"] [data-label="Checked"]').css('visibility', 'visible') { $('[data-label="trash"], [data-label="Sort Options"]').css({'display': '', 'visibility': 'visible'}); } else { $('[data-label="trash"], [data-label="Sort Options"]').css({'display': 'none', 'visibility': 'hidden'}); } }); Any help would be greatly appreciated! Thanks

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  • How do I implement IEnumerable?

    - by Stacey
    I have a class that contains a static number of objects. This class needs to be frequently 'compared' to other classes that will be simple List objects. public partial class Sheet { public Item X{ get; set; } public Item Y{ get; set; } public Item Z{ get; set; } } the items are obviously not going to be "X" "Y" "Z", those are just generic names for example. The problem is that due to the nature of what needs to be done, a List won't work; even though everything in here is going to be of type Item. It is like a checklist of very specific things that has to be tested against in both code and runtime. This works all fine and well; it isn't my issue. My issue is iterating it. For instance I want to do the following... List<Item> UncheckedItems = // Repository Logic Here. UncheckedItems contains all available items; and the CheckedItems is the Sheet class instance. CheckedItems will contain items that were moved from Unchecked to Checked; however due to the nature of the storage system, items moved to Checked CANNOT be REMOVED from Unchecked. I simply want to iterate through "Checked" and remove anything from the list in Unchecked that is already in "Checked". So naturally, that would go like this with a normal list. foreach(Item item in Unchecked) { if( Checked.Contains(item) ) Unchecked.Remove( item ); } But since "Sheet" is not a 'List', I cannot do that. So I wanted to implement IEnumerable so that I could. Any suggestions? I've never implemented IEnumerable directly before and I'm pretty confused as to where to begin.

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  • Enable/disable virtual keyboard

    - by dr.Xis
    I'm using a virtual keyboard. I have a checkbox that controls whether the virtual keyboard is displayed or not. The thing is that I don't understand how to disable it. I try to unbind it but it doesn't work... I also tried to use namespaces and then unbind all namespaces but still the keyboard remains accessible after a click on the text box. <input class="virtualKeyboardField ui-keyboard-input ui-widget-content ui-corner-all" data-val="true" data-val-required="The User name field is required." id="loginUserName" name="UserName" type="text" value="" aria-haspopup="true" role="textbox"> <script type="text/javascript"> $(function () { //show login $("#showLogin").on({ click: function () { $("#loginFormDiv").toggle("slow"); } }); $("#cb_showVKey").on('click', CheckIsToShowKey); }); function CheckIsToShowKey(event) { //var isCheck = $("#cb_showVKey").is(':checked'); //alert("ischecked? " + isCheck); if ($("#cb_showVKey").is(':checked')) { //if checked BindKeyboards(); } else { //not checked UnBindKeyboards(); } } function bindVirtualKeyboards() { $("#loginForm").delegate(".virtualKeyboardField", "click.xpto", BindKeyboards); } function UnBindKeyboards() { $("#loginForm").undelegate(".virtualKeyboardField", "click.xpto", BindKeyboards); } function BindKeyboards() { // alert(event.currentTarget.id); //alert("xpto"); if ($("#cb_showVKey").is(':checked')) { $("#loginUserName").keyboard({ layout: 'qwerty', lockInput: true, preventPaste: true }); $("#loginUserPassword").keyboard({ layout: 'qwerty', lockInput: true, preventPaste: true }); } } $(document).ready(function () { $("#loginForm").validate(); BindKeyboards(); }); </script> Any help guys?

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  • jquery elements by class

    - by tom
    Hi there im trying to get all dropdown lists by class and change their names, my code is not working, is there something i am missing? $(document).ready(function () { $('.mutuallyexclusive').live("click", function () { checkedState = $(this).attr('checked'); $('.mutuallyexclusive:checked').each(function () { $(this).attr('checked', false); $(this).attr('name', 'chk'); }); $(this).attr('checked', checkedState); if (checkedState) { var prev = $(this).prev('select').attr("name", 'cat.parent_id'); elements = $('select.selected'); elements.each(function () { $(this).attr("name", "bbb"); }); } else { var prev = $(this).prev('select').attr("name", 'dd'); } }); });

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  • jquery small issue I need help with

    - by Martin
    Hi I need help with a bit of jquery, I am renaming dropdown lists when a checkbox next to them is clicked. I want to get the selected option value of the dropdown called 'Prev' in the code below and assign to the checkbox that is clicked. I hope it makes sense. Thanks $('.mutuallyexclusive').live("click", function() { checkedState = $(this).attr('checked'); $('.mutuallyexclusive:checked').each(function() { $(this).attr('checked', false); $(this).attr('name', 'chk'); }); $(this).attr('checked', checkedState); if (checkedState) { jQuery('#myForm select[name=cat.parent_id]').attr('name', 'bar') // here is the bit i need help with var prev = $(this).prev('select').attr("name", 'cat.parent_id'); } else { var prev = $(this).prev('select').attr("name", 'dd'); } }); });

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  • How to separate the year from a birthdate?

    - by Sandipan
    I want to separate the year from the Birthdate.I have a checkbox called Birthdate and when checked it will show the mm/dd/yy. But I want to separate this and show only the date along with the month. And there will be another checkbox called year which will only show if the Birthdate checkbox is checked and if checked it will show the year

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  • Using jQuery .find() with multiple conditions at the same time?

    - by fuzzybabybunny
    I know that there are other ways of grabbing radio button values, but I want to know how to do this with .find(). I only want to log the value of the selected radio button, so it requires finding by two conditions at the same time: The button with name=area The button with selected=selected <div class="radio"> <label> <input class="track-order-change" type="radio" name="area" id="area1" value="area1" checked="checked"> Area 1 </label> </div> <div class="radio"> <label> <input class="track-order-change" type="radio" name="area" id="area2" value="area2"> Area 2 </label> </div> <div class="radio"> <label> <input class="track-order-change" type="radio" name="area" id="area3" value="area3"> Area 3 </label> </div> When anything with the class track-order-change changes, it will run the function UpdateOrderSubmission. $('.track-order-change').on('change', function() { updateOrderSubmission() }); I want the updateOrderSubmission function to console log the value of the radio button that is selected. var updateOrderSubmission = function() { var orderSubmission = { area: $('#submit-initial-form').find('[name=area],[checked=checked]').this.val() } console.log(orderSubmission) }; The code above doesn't work. How do I grab the value of the selected radio button? I need to do .find() with two conditions (name and checked), not just one condition.

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  • SQL SERVER – Find Max Worker Count using DMV – 32 Bit and 64 Bit

    - by pinaldave
    During several recent training courses, I found it very interesting that Worker Thread is not quite known to everyone despite the fact that it is a very important feature. At some point in the discussion, one of the attendees mentioned that we can double the Worker Thread if we double the CPU (add the same number of CPU that we have on current system). The same discussion has triggered this quick article. Here is the DMV which can be used to find out Max Worker Count SELECT max_workers_count FROM sys.dm_os_sys_info Let us run the above query on my system and find the results. As my system is 32 bit and I have two CPU, the Max Worker Count is displayed as 512. To address the previous discussion, adding more CPU does not necessarily double the Worker Count. In fact, the logic behind this simple principle is as follows: For x86 (32-bit) upto 4 logical processors  max worker threads = 256 For x86 (32-bit) more than 4 logical processors  max worker threads = 256 + ((# Procs – 4) * 8) For x64 (64-bit) upto 4 logical processors  max worker threads = 512 For x64 (64-bit) more than 4 logical processors  max worker threads = 512+ ((# Procs – 4) * 8) In addition to this, you can configure the Max Worker Thread by using SSMS. Go to Server Node >> Right Click and Select Property >> Select Process and modify setting under Worker Threads. According to Book On Line, the default Worker Thread settings are appropriate for most of the systems. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, SQL, SQL Authority, SQL Query, SQL Scripts, SQL Server, SQL System Table, SQL Tips and Tricks, T SQL, Technology Tagged: SQL DMV

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  • Install Adobe AIR on Ubuntu/Linux

    Since quite some time Adobe Technologies released the Linux version of Adobe AIR to bring web applications and widgets to your desktop. Installing new applications on a Linux system is not always as easy as switching the computer on. The following instructions might be helpful to install Adobe AIR on any Linux system. First of all, get the latest installer of Adobe AIR from http://get.adobe.com/air/ - as of writing this article the file name is AdobeAIRInstaller.bin. Save the download in your preferred folder. Now, there are two ways to run the installer - visual style or console style. Visual Installation Launch your favorite or standard file manager like thunar or nautilus and browse to the folder where the AdobeAIRInstaller.bin has been saved. Right click on the file and choose 'Properties' in the context menu Set 'Execute' permissions and confirm modifications with OK Rename file into AdobeAIRInstaller Double click and follow the instructions Using the console Open a terminal like xterm Change into the directory where you stored the download Run this command:[code]chmod +x AdobeAIRInstaller.bin[/code] Now run this command:[code]sudo ./AdobeAIRInstaller.bin[/code] The normal installer will open, install it. From now whenever you download a .air file, just double click it and it will be installed. Troubleshooting In case that the installation does not start properly, try to install via console. This gives you more details about the reasons. Should you run into something like this: [code]AdobeAIRInstaller.bin: 1: Syntax error: "(" unexpected[/code] Double check the execute permission of the installer file and try again.

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  • Extreme Optimization –Mathematical Constants and Basic Functions

    - by JoshReuben
    Machine constants The MachineConstants class - contains constants for floating-point arithmetic because the CLS System.Single and Double floating-point types do not follow the standard conventions and are useless. machine constants for the Double type: machine precision: Epsilon , SqrtEpsilon CubeRootEpsilon largest possible value: MaxDouble , SqrtMaxDouble, LogMaxDouble smallest Double-precision floating point number that is greater than zero: MinDouble , SqrtMinDouble , LogMinDouble A similar set of constants is available for the Single Datatype  Mathematical Constants The Constants class contains static fields for many mathematical constants and common expressions involving small integers – if you are doing thousands of iterations, you wouldn't want to calculate OneOverSqrtTwoPi , Sqrt17 or Log17 !!! Fundamental constants E - The base for the natural logarithm, e (2.718...). EulersConstant - (0.577...). GoldenRatio - (1.618...). Pi - the ratio between the circumference and the diameter of a circle (3.1415...). Expressions involving fundamental constants: TwoPi, PiOverTwo, PiOverFour, LogTwoPi, PiSquared, SqrPi, SqrtTwoPi, OneOverSqrtPi, OneOverSqrtTwoPi Square roots of small integers: Sqrt2, Sqrt3, Sqrt5, Sqrt7, Sqrt17 Logarithms of small integers: Log2, Log3, Log10, Log17, InvLog10  Elementary Functions The IterativeAlgorithm<T> class in the Extreme.Mathematics namespace defines many elementary functions that are missing from System.Math. Hyperbolic Trig Functions: Cosh, Coth, Csch, Sinh, Sech, Tanh Inverse Hyperbolic Trig Functions: Acosh, Acoth, Acsch, Asinh, Asech, Atanh Exponential, Logarithmic and Miscellaneous Functions: ExpMinus1 - The exponential function minus one, ex-1. Hypot - The hypotenuse of a right-angled triangle with specified sides. LambertW - Lambert's W function, the (real) solution W of x=WeW. Log1PlusX - The natural logarithm of 1+x. Pow - A number raised to an integer power.

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  • C# vector class - Interpolation design decision

    - by Benjamin
    Currently I'm working on a vector class in C# and now I'm coming to the point, where I've to figure out, how i want to implement the functions for interpolation between two vectors. At first I came up with implementing the functions directly into the vector class... public class Vector3D { public static Vector3D LinearInterpolate(Vector3D vector1, Vector3D vector2, double factor) { ... } public Vector3D LinearInterpolate(Vector3D other, double factor { ... } } (I always offer both: a static method with two vectors as parameters and one non-static, with only one vector as parameter) ...but then I got the idea to use extension methods (defined in a seperate class called "Interpolation" for example), since interpolation isn't really a thing only available for vectors. So this could be another solution: public class Vector3D { ... } public static class Interpolation { public static Vector3D LinearInterpolate(this Vector3D vector, Vector3D other, double factor) { ... } } So here an example how you'd use the different possibilities: { var vec1 = new Vector3D(5, 3, 1); var vec2 = new Vector3D(4, 2, 0); Vector3D vec3; vec3 = vec1.LinearInterpolate(vec2, 0.5); //1 vec3 = Vector3D.LinearInterpolate(vec1, vec2, 0.5); //2 //or with extension-methods vec3 = vec1.LinearInterpolate(vec2, 0.5); //3 (same as 1) vec3 = Interpolation.LinearInterpolation(vec1, vec2, 0.5); //4 } So I really don't know which design is better. Also I don't know if there's an ultimate rule for things like this or if it's just about what someone personally prefers. But I really would like to hear your opinions, what's better (and if possible why ).

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  • Why, in WPF, do we set an object to Stretch via its Alignment properties instead of Width/Height?

    - by Jonathan Hobbs
    In WPF's XAML, we can tell an element to fill its container like this: <Button HorizontalAlignment="Stretch" VerticalAlignment="Stretch" /> Why is it that when we set an element to Stretch, we do it via the HorizontalAlignment and VerticalAlignment properties? Why did the WPF design team decide to take this approach over having Width="Stretch" and Height="Stretch"? I presume it was a calculated decision, and I'm curious about the reasoning. CSS, among other technologies, follows the convention that stretching is done via the width and height properties, and that alignment affects positioning exclusively. This seems intuitive enough: stretching the element is manipulating its width and height, after all! Using the corresponding alignment property to stretch an element seems counter-intuitive and unusual in comparison. This makes me think they didn't just pick this option for no reason: they made a calculated decision and had reasons behind it. Width and Height use the double data type, which would ordinarily mean assigning it a string would be silly. However, WPF's Window objects can take Width="Auto", which gets treated as double.NaN. Couldn't Width="Stretch" be stored as double.PositiveInfinity or some other value?

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  • Precision loss when transforming from cartesian to isometric

    - by Justin Skiles
    My goal is to display a tile map in isometric projection. This tile map has 25 tiles across and 25 tiles down. Each tile is 32x32. See below for how I'm accomplishing this. World Space World Space to Screen Space Rotation (45 degrees) Using a 2D rotation matrix, I use the following: double rotation = Math.PI / 4; double rotatedX = ((tileWorldX * Math.Cos(rotation)) - ((tileWorldY * Math.Sin(rotation))); double rotatedY = ((tileWorldX * Math.Sin(rotation)) + (tileWorldY * Math.Cos(rotation))); World Space to Screen Space Scale (Y-axis reduced by 50%) Here I simply scale down the Y value by a factor of 0.5. Problem And it works, kind of. There are some tiny 1px-2px gaps between some of the tiles when rendering. I think there's some precision loss somewhere, or I'm not understanding how to get these tiles to fit together perfectly. I'm not truncating or converting my values to non-decimal types until I absolutely have to (when I pass to the render method, which only takes integers). I'm not sure how to guarantee pixel perfect rendering precision when I'm rotating and scaling on a level of higher precision. Any advice? Do I need to supply for information?

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