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  • How can I avoid garbage collection delays in Java games? (Best Practices)

    - by Brian
    I'm performance tuning interactive games in Java for the Android platform. Once in a while there is a hiccup in drawing and interaction for garbage collection. Usually it's less than one tenth of a second, but sometimes it can be as large as 200ms on very slow devices. I am using the ddms profiler (part of the Android SDK) to search out where my memory allocations come from and excise them from my inner drawing and logic loops. The worst offender had been short loops done like, for(GameObject gob : interactiveObjects) gob.onDraw(canvas); where every single time the loop was executed there was an iterator allocated. I'm using arrays (ArrayList) for my objects now. If I ever want trees or hashes in an inner loop I know that I need to be careful or even reimplement them instead of using the Java Collections framework since I can't afford the extra garbage collection. That may come up when I'm looking at priority queues. I also have trouble where I want to display scores and progress using Canvas.drawText. This is bad, canvas.drawText("Your score is: " + Score.points, x, y, paint); because Strings, char arrays and StringBuffers will be allocated all over to make it work. If you have a few text display items and run the frame 60 times a second that begins to add up and will increase your garbage collection hiccups. I think the best choice here is to keep char[] arrays and decode your int or double manually into it and concatenate strings onto the beginning and end. I'd like to hear if there's something cleaner. I know there must be others out there dealing with this. How do you handle it and what are the pitfalls and best practices you've discovered to run interactively on Java or Android? These gc issues are enough to make me miss manual memory management, but not very much.

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  • Why is this one div container blocking the other from floating right?

    - by user2824289
    I know the answer is very simple, it's probably one little CSS property, but I've tried to find the solution without asking it here, no luck.. There are two div containers within a div container, and they aren't playing nice. The one is positioned to float right in the upper righthand corner of the parent div, and it won't let any other container float to the right of it. I tried display:inline and display:inline-block but no luck... Here's the code, though something tells me the answer is so easy you won't need it!: The parent div, the upper righthand corner div, and the poor div trying to float right: #um-home-section4 { width:100%; height:300px; background-color: green; } #um-title-right { float:right; width:500px; height:50px; margin-right:20px; margin-top:20px; background-color: fuchsia; } #take-me-there { float:right; margin-top:240px; margin-right:0px; height:50px; width:100px; background-color: gray; } <div id="um-home-section4"> <div id="um-title-right"></div> <div id="take-me-there"></div> </div>

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  • Duplicate information from sql result

    - by puddleJumper
    I looked in about 18 other posts on here an most people are asking how to delete the records not just hide them. So my problem: I have a database with staff members who are associated with locations. Many of the staff members are associated with more than one location. What I want to do is to only display the first location listed in the mysql result and skip over the others. I have the sql query linking the tables together and it works aside from it showing the same information for those staff members that are in those other locations multiple times so example would be like this: This is the sql statement I have currently SELECT staff_tbl.staffID, staff_tbl.firstName, staff_tbl.middleInitial, staff_tbl.lastName, location_tbl.locationID, location_tbl.staffID, officelocations_tbl.locationID, officelocations_tbl.officeName, staff_title_tbl.title_ID, staff_title_tbl.staff_ID, titles_tbl.titleID, titles_tbl.titleName FROM staff_tbl INNER JOIN location_tbl ON location_tbl.staffID = staff_tbl.staffID INNER JOIN officelocations_tbl ON location_tbl.locationID = officelocations_tbl.locationID INNER JOIN staff_title_tbl ON staff_title_tbl.staff_ID = staff_tbl.staffID INNER JOIN titles_tbl ON staff_title_tbl.title_ID = titles_tbl.titleID and my php is <?php do { ?> <tr> <td><?php echo $row_rs_Staff_Info['firstName']; ?>&nbsp; <?php echo $row_rs_Staff_Info['lastName']; ?></td> <td><?php echo $row_rs_Staff_Info['titleName']; ?>&nbsp; </td> <td><?php echo $row_rs_Staff_Info['officeName']; ?>&nbsp; </td> </tr> <?php } while ($row_mysqlResult = mysql_fetch_assoc($rs_mysqlResult)); ?> What I would like to know is there a way using php to select only the first entry listed for each person and display that and just skip over the other two. I was thinking it could be done by possibly adding the staffID's to an array and if they are in there to skip over the next one listed in the staff_title_tbl but wasn't quite sure how to write it that way. Any help would be great thank you in advance.

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  • PHP site scheduling Java execution?

    - by obfuscation
    I'm trying to get started on combining my (slightly limited) PHP experience with my (better) Java experience, in a project where I need to allow uploads of Java source files to the server, which the server then executes Javac on to compile it. Then, at a set time (e.g. specified on upload) I need to run that once on the server, which will generate some database info for the PHP site to display. To describe my current programming abilities- I have made many desktop Java programs, and am confident in 'pure' Java, but so far have only undertaken a couple of PHP projects (including using the CodeIgniter framework). My motivation for using PHP as the frontend is because I know it is very fast, lightweight and I will be able to display the results I need very easily with it (simple DB readout). Ideally, the technology used should be able to be developed on a localhost (e.g. WAMP, Tomcat etc..) Is there any advice which you could give on what technology I should consider to use to bridge this gap, and what resources could help in using that technology? I have looked at a few, but have struggled to find documentation helping in achieving what I need.

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  • Image not rendering in dompdf

    - by Venkat
    I am using codeIgniter and dompdf for my application for generating pdfs. The below code is the code which i am using to display an image. <div class=\"block_head\"> <h2>Image display</h2>"; $image_location = "/images/xxx.png"; $html .="<img src=\"".$image_location."\" width=\"200\" height=\"200\" /> </div>"; I tested and debugged all ways whether i am doing something wrong. Like this first i checked whether the path is wrong. This is path on the server. It's correct. I tested by echoing $html also it's showing perfectly path. When i clicked on that path image is displaying. But when i am trying to render it in pdf it's not displaying. Note: PDF is generating perfectly without image.

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  • JQUERY - how to get updated value after ajax removes data from within it?

    - by Brian
    I have a an element with thumbnails. I allow users to sort their display order (which fires off an update to the DB via ajax). I also allow them to delete images (which, after deletion, fires off a request to update the display order for all remaining images). My problem is with binding or live I think, but I don't know where to apply it. The array fired off upon delete contains ALL the ids for the images that were there on page load. The issue is that after they delete an image the array STILL contains the original ids (including the one that was deleted) so it is obviously not refreshing the value of the element after ajax has removed things from inside it. I need to tell it to go get the refreshed contents... From what I have been reading, this is normal but I don't understand how to tie it into my routine. I need to trigger the mass re-ordering after any deletion. Any ideas gurus? $('a.delimg').click(function(){ var parent = $(this).parent().parent(); var id = $(this).attr('id'); $.ajax({ type: "POST", url: "../updateImages.php", data: "action=delete&id=" + id, beforeSend: function() { parent.animate({'backgroundColor':'#fb6c6c'},300); $.jnotify("<strong>Deleting This Image & Updating The Image Order</strong>", 5000); }, success: function(data) { parent.slideUp(300,function() { parent.remove(); $("#images ul").sortable(function() { //NEEDS TO GET THE UPDATED CONTENT var order = $(this).sortable("serialize") + '&action=updateRecordsListings'; $.post("../updateImages.php", order, function(theResponse){ $.jnotify("<strong>" + theResponse + "</strong>", 2000); }); }); }); } }); return false; }); Thanks for any help you can be.

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  • Figure and figcaption figures shrink images

    - by Why Not
    I'm attempting to use the figure and figcaption tags to varying success. Someone suggested a great CSS method to get rid of the figure margin and also link up the caption with the image. The problem: all images shrink to an extremely small size. Not sure how to rectify this. These are user-submitted images using Django so they vary in size. But currently, using these fixes, all of these shrink with a caption that does fit the image but defeats the purpose as it results in a tiny image with a caption with an even width. {% if story.pic %} <h2>Image</h2> <figure> <img class="image"src="{{ story.pic.url }}" alt="some_image_alt_text"/> {% if story.caption %} <figcaption>{{story.caption}}</figcaption> {% endif %} </figure> {% endif %} figure {margin:0; display:table; width:1px;} figcaption {display:table-row;}

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  • What goes into the "Controller" in "MVC"?

    - by P72endragon
    I think I understand the basic concepts of MVC - the Model contains the data and behaviour of the application, the View is responsible for displaying it to the user and the Controller deals with user input. What I'm uncertain about is exactly what goes in the Controller. Lets say for example I have a fairly simple application (I'm specifically thinking Java, but I suppose the same principles apply elsewhere). I organise my code into 3 packages called app.model, app.view and app.controller. Within the app.model package, I have a few classes that reflect the actual behaviour of the application. These extends Observable and use setChanged() and notifyObservers() to trigger the views to update when appropriate. The app.view package has a class (or several classes for different types of display) that uses javax.swing components to handle the display. Some of these components need to feed back into the Model. If I understand correctly, the View shouldn't have anything to do with the feedback - that should be dealt with by the Controller. So what do I actually put in the Controller? Do I put the public void actionPerformed(ActionEvent e) in the View with just a call to a method in the Controller? If so, should any validation etc be done in the Controller? If so, how do I feedback error messages back to the View - should that go through the Model again, or should the Controller just send it straight back to View? If the validation is done in the View, what do I put in the Controller? Sorry for the long question, I just wanted to document my understanding of the process and hopefully someone can clarify this issue for me!

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  • wp trim function

    - by Juliver Galleto
    Ok i have this code currently. <?php query_posts('category_name=widgets2'); echo "<div id='widgets-wrapper2'><div id='marginwidgets' style='overflow: auto; max- width: 100%; height: 450px; max-height: 100%; margin: 0 auto;'>"; while (have_posts()) : the_post(); echo "<div class='thewidgets2'>"; echo wp_trim_words( the_content(), $num_words = 0, $more = "..." ); echo '<div style="height: 20px;"></div><a class="button2" href="'.get_permalink().'">Read More</a></div>'; endwhile; echo "</div></div>"; ?> as you can see, it gets all the post from the category name widgets2 and then it should display it. and this line echo wp_trim_words( the_content(), $num_words = 100, $more = "..." ); should trim the words from the_content() to 100 and add a excerpt at the end character but unfortunately it doesnt work, instead it just display the entire contents that looks untrim at all. Hope someone here could figured out. Im open in any suggestions, recommendations and all relevant ideas, thank you.

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  • Bind data of interface properties only

    - by nivpenso
    I am new in all the Entity Framework models and the data bindings. I created an interface and generated a model class from my Candidate table in the db. public interface ICandidate { String ID { get; set; } string Name { get; set; } string Mail { get; set; } } i created a partial class to the generated Candidate model so i will be able to implement the ICandidate interface without changing any generated code. public partial class Candidates : ICandidate { string ICandidate.ID { get { return this.PK; } set { _PK = value; } } string ICandidate.Name { get{ return this._Name; } set { _Name = value; } } string ICandidate.Mail { get { return this._Email; } set { this._Email = value; } } } Of course, the generated class has more properties than the interface has (Like IsDeleted field that is not necessary for the interface). I want to display in a DataGridView all the candidates from the db. But I want that only the interface's properties will be shown as columns in the DataGridView. Is there a way bind only the interface's properties the the DataGridView? In my DB there is a table called Candidate_To_Company with these columns: PK, Candidate_FK, Company_FK, Insertion_Date I would like to bind this table to DataGridView. but instead of displaying Candidate_FK i would like to display the candidate name from ICandidate. Is this possible?

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  • Why is the page shifting to top with a container that has overflow:hidden ?

    - by Maher4Ever
    I'm facing a problem that's really strange. It's in every browser. Everything is working correctly, until you try to go to a section using the hash ( like #contactUs in my page)... try this url : http://mahersalam.co.cc/projects/2011/#contactUs You will see that the page SHIFTS 10px to the top. if you take the hash, it works again. I have a wrapper on the page (#container) that has overflow:hidden, I did it to make sure no scroll bars appear if the resolution change. If you remove the overflow property it works too. I guess the shifting happens through the place of the scroll bar, but because it's hidden it's place only stays. So does anyone knows how to fix this problem ?

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  • Get ffmpeg information in friendly way

    - by JBernardo
    Every time I try to get some information about my video files with ffmpeg, it pukes a lot of useless information mixed with good things. I'm using ffmpeg -i name_of_the_video.mpg. There are any possibilities to get that in a friendly way? I mean JSON would be great (and even ugly XML is fine). By now, I made my application parse the data with regex but there are lots of nasty corners that appear on some specific video files. I fixed all that I encountered, but there may be more. I wanted something like: { "Stream 0": { "type": "Video", "codec": "h264", "resolution": "720x480" }, "Stream 1": { "type": "Audio", "bitrate": "128 kbps", "channels": 2 } }

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  • How do I "valueOf" an enum given a class name?

    - by stevemac
    Lets say I have a simple Enum called Animal defined as: public enum Animal { CAT, DOG } and I have a method like: private static Object valueOf(String value, Class<?> classType) { if (classType == String.class) { return value; } if (classType == Integer.class) { return Integer.parseInt(value); } if (classType == Long.class) { return Long.parseLong(value); } if (classType == Boolean.class) { return Boolean.parseBoolean(value); } // Enum resolution here } What can I put inside this method to return an instance of my enum where the value is of the classType? I have looked at trying: if (classType == Enum.class) { return Enum.valueOf((Class<Enum>)classType, value); } But that doesn't work.

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  • How to show and update popup in 1 thread

    - by user3713986
    I have 1 app. 2 Forms are MainFrm and PopupFrm, 1 thread to update some information to PopupFrm Now to update PopupFrm i use: In MainFrm.cs private PopupFrm mypop; MainFrm() { .... PopupFrm mypop= new PopupFrm(); mypop.Show(); } MyThread() { Process GetData();... mypop.Update(); ... } In PopupFrm.cs public void Update() { this.Invoke((MethodInvoker)delegate .... }); } Problem here that mypopup alway display when MainFrm display (Start application not when has data to update). So i change MainFrm.cs to : private PopupFrm mypop; private bool firstdisplay=false; MainFrm() { .... PopupFrm mypop= new PopupFrm(); //mypop.Show(); } MyThread() { Process GetData();... if(!firstdisplay) { mypop.Show(); firstdisplay=true; } mypop.Update(); ... } But it can not update Popup GUI. So how can i fix this issue ? Thanks all.

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  • cakephp find('list') - problem using

    - by MOFlint
    I'm trying to get an array to poplulate a Counties select. If I use find('all') I can get the data but this array needs flattening to use in the view with $form-input($counties). If I use find('list') I can't seem to get the right array - which is simple array of county names. What I have tried is this: $ops=array( 'conditions' => array( 'display' => '!=0', 'TO_DAYS(event_finish) >= TO_DAYS(NOW())' ), 'fields' => 'DISTINCT venue_county', 'order' => 'venue_county DESC' ); $this->set('counties', $this->Event->find('list',$ops)); but the SQL this generates is: SELECT Event.id, DISTINCT Event.venue_county FROM events AS Event WHERE display = 1 AND TO_DAYS(event_finish) = TO_DAYS(NOW()) ORDER BY venue_county DESC which generates an error because it first inserts the Event.id field in the query - which is not wanted and causes the error. In my database I have a single table for Events which includes the venue address and I don't really want to create another table for address. What options should I be using efor the find('list') call?

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  • Eclipse debug - line: not available

    - by Mike
    I can't seem to find anything on google telling me why this might be and what the resolution is. I'm Stepping through third party code (that I have the source for) and would really like to see the current line being executed... Looking at javac compile flags, I see the -g:none flag. If this flag is set, would this be enough to explain why I'm not able to see line numbers? If so, why would someone do this, are there performance implications? Do I need to recompile the jar myself to attach the missing debug info (if possible)? Thanks!

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  • login script in php using session variables

    - by kracekumar
    ? username: '; } else { $user=$_POST['user']; $query="select name from login where name='$user'"; $result=mysql_query($query) or die(mysql_error()); $rows=mysql_num_rows($result)or die(mysql_error()); session_start(); //echo "results"; $username=mysql_fetch_array($result) or die(mysql_error()); $fields=mysql_num_fields($result) or die(mysql_error()); echo "username:$username[0]"; $_SESSION['username']=$username[0]; $sesion_username=$_SESSION['username']; //echo "rows:$rows"." "."fields:$fields"; echo""."username:$sesion_username"; } ? i wanted to create a site where user can login and upload their details depending on their user name have stored their details in a database,the problem i am facing is two people 'a' and 'b' login one after other session_variable $_SESSION['username'] will have 'b's' username ,so i can't display 'a's' details now. . . . what i want to achieve is when a user logins in i want to store his name and other details in session variable and navigate him according and display his details

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  • Adding a border (Fixed3D) to an existing borderless application

    - by Aphelion
    Hi there, I have an .NET application that always starts itself with its border style to 'None', as it is supposed to be an full-screen application with a fixed resolution. However, i would like to add the window border (Fixed3D) to this window when the application starts so that I am able to move it around my desktop. My first idea was to have a tray app running, monitoring event messages, and somehow change the window style when this specific application starts. However, I am not sure if this will work and how to do this. Anyone that can point me in the right direction?

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  • Radio button is not funtioning

    - by user3614421
    I'm having problem with my radio button in my gridview. I want to select any row one by one so that I can perform UPDATE, DELETE, and DISPLAY the row. When I select the button, the page will be refreshed and the button I selected before is not selected anymore. So I can't click any menu to update, delete or display the row. I noticed this is happening when I set the Autopostback = "True". How can I solve it? Any idea? Below are my codes: Page: <script language="javascript" type="text/javascript"> function radiobtn(id) { var rdBtn = document.getElementById(id); var List = document.getElementsByTagName("input"); for (i = 0; i < List.length; i++) { if (List[i].type == "radio" && List[i].id != rdBtn.id) { List[i].checked = false; } } } </script> <asp:RadioButton ID="CheckDel" runat="server" onclick="javascript:radiobtn(this.id)" OnCheckedChanged="CheckDel_CheckedChanged" AutoPostBack="True" /> server end: protected void CheckDel_CheckedChanged(object sender, EventArgs e) { CheckBox chkStatus = (CheckBox)sender; GridViewRow row = (GridViewRow)chkStatus.NamingContainer; Session["datestart"] = row.Cells[1].Text; Session["empid"] = row.Cells[2].Text; Session["empname"] = row.Cells[3].Text; Session["days"] = row.Cells[4].Text; Session["leavetype"] = row.Cells[5].Text; Session["leavestatus"] = row.Cells[6].Text; bool status = chkStatus.Checked; } Please help

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  • Calculating toolbar icon width

    - by TheWzrdOz
    I am building an RDP client and I have toolbar that shows the running applications, same as the Windows toolbar. I need to support dual monitors, so my questions are 1) How do I detect that there is more than one monitor and 2) Is there a formula for calculating the width of the icons on the toolbar? I know that at the start, the width is not dependent on the number of monitors, and is always the same size. What does change is the number of icons I can display before I must start "shrinking" their width, and it will depend on the screen resolution as well. Any ideas?

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  • How to change a table row color when clicked and back to what it was originally when another row clicked?

    - by user1277222
    As the title explains, I wish to change the color of a row when it is clicked then revert the color when another is clicked, however still change the color of the newly clicked row. A resolution in JQuery would be much appreciated. I just can't crack this one. What I have so far but it's not working for me. function loadjob(jobIDincoming, currentID){ $("#joblistingDetail").load('jobview.php' , {jobID: jobIDincoming}).hide().fadeIn('100'); var last = new Array(); last.push(currentID); $(last[last.length-1]).closest('tr').css('background-color', 'white'); $(currentID).closest('tr').css('background-color', 'red');};

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  • How to make cakePHP retreive the data represented by a foreign key?

    - by XL
    Greetings cake experts, I have a question that I think would really help a lot of people getting started with cakePHP. I have a feeling it will be easy for some of you, but it is quite challenging to me. I have a simple database with multiple tables. I can't figure out how to make cakePHP display the values associated with a foreign key in an index view. Or create a view where the fields of my choice (the ones that make sense to users like location name - not location_id can be updated or viewed on a single page). I have created an example at http://lovecats.cakeapp.com that illustrate the question. If you look at the page and click the "list cats", you will notice that it shows the location_id field from the locations table. You will also notice that when you click "add cats", you must choose a location_id from the locations table. This is the automagic way that cakePHP builds the app. I want this to be the field location_name. The database is setup so that the table cats has a foreign key called location_id that has a relationship to a table called locations. This is my problem: I want these pages to display the location_name instead of the location_id. If you want to login to the application, you can go to http://cakeapp.com/sqldesigners/sql/lovecats and the password 'password' to look at the db relationships, etc. How do I have a page that shows the fields that I want? And is it possible to create a page that updates fields from all of the tables at once? This is the slice of cake that I have been trying to figure out and this would REALLY get me over a hump. You can download the app and sql from the above url.

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  • Android drawrRect only produces squares

    - by user1905553
    I present the following code snippet: // < Android / Eclipse Kepler > // < Screen resolution: 480x800 > Graphics g = game.getGraphics(); g.drawRect(0, 0, g.getWidth()/2, g.getHeight(), Color.GRAY); Produces a square [0,0], [240, 240] (240 = g.getWidth/2 = 480/2) I expected to get a rectangle [0,0] [240, 800] Can anyone tell me if I'm wrong or if the drawRect uses width instead of height? How do I fix this? Please, if possible, test before post your answer. Help me to save a ridiculous bitmap. Thanks to all!

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  • priority queue implementation

    - by davit-datuashvili
    i have implemented priority queue and i am interested if it is correct public class priqueue { private int n,maxsize; int x[]; void swap(int i,int j){ int t=x[i]; x[i]=x[j]; x[j]=t; } public priqueue(int m){ maxsize=m; x=new int [maxsize+1]; n=0; } void insert(int t){ int i,p; x[++n]=t; for (i=n;i>1 && x[p=i/2] >x[i];i=p) swap(p,i); } public int extramin(){ int i,c; int t=x[1]; x[1]=x[n--]; for (i=1;(c=2*i)<=n;i=c){ if (c+1<=n && x[c+1]<x[c]) c++; if (x[i]<=x[c]) break; swap(c,i); } return t; } public void display(){ for (int j=0;j<x.length;j++){ System.out.println(x[j]); } } } public class priorityqueue { public static void main(String[] args) { priqueue pr=new priqueue(12); pr.insert(20); pr.insert(12); pr.insert(22); pr.insert(15); pr.insert(35); pr.insert(17); pr.insert(40); pr.insert(51); pr.insert(26); pr.insert(19); pr.insert(29); pr.insert(23); pr.extramin(); pr.display(); } } //result: 0 12 15 17 20 19 22 40 51 26 35 29 23

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  • How can I load a div in rails in response to clicks on another div?

    - by mmr
    I'm very new to Rails (and web) programming, so I'm not even sure what technology I should be looking for for this. I've downloaded and run through the first five chapters of the Rails tutorial, but now have a very simple request. On the left hand side of a web page, I will have a table. If the user clicks on an element in that table, I want to have the right hand side of the page show something new. I already have a page to display the table, viz: <div class="center hero-unit"> <div class="container"> <h2>2012 Yearly Report</h2> <div class="row-fluid"> <div class="span12"> <div class="span4"> <table border="1"> </table> </div> <div class="span6"> <!-- load stuff here based on what someone clicks on in the table --> </div> </div> </div> </div> </div> And I'm using bootstrap layouts to display everything. I just don't understand how to change the contents of the 'span6' div based on user behavior in 'span4'.

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