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• How do I add two alternating UITableViews to an existing UINavigationController view?

  - by Ron Flax

  I'm new to iPhone development and I am writing an iPhone app that needs two different table views, which are selectable using a button bar or tab bar. These table views are both the same size, but only cover about two thirds of the screen from the bottom up. The top portion of the screen remains the same when either of these tables is displayed. I'd also like to animate (flip) these views when the user selects one or the other. The view that these two tables will be displayed on is the detail view of my app where the user has already selected an item from the primary screen's table. I'm using a UINavigationController to manage the primary and detail views and I have this working. I also have the first of these two detail tables working as part of my detail view, but I think it makes more sense to isolate the code for these two tables and not duplicate all of the code for the part of the detail view that doesn't change. I don't really care how these two table views are created (either in code or via IB). I've tried several things and I can't seem to figure it out. Any help or ideas (with sample code) would be greatly appreciated!

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• How do I create rows with alternating colors for a UITableView on iPhone?

  - by Mat

  Hi all, i would to have alternate 2 colors of rows, like the first black, the second white, the third black, etc, etc... my approach is like a basic exercise of programming to calculate if a number is odd number or not: - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; cell = ((MainCell*)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]); if (cell==nil) { NSArray *topLevelObjects=[[NSBundle mainBundle] loadNibNamed:@"MainCell" owner:self options:nil]; for (id currentObject in topLevelObjects){ if ([currentObject isKindOfClass:[UITableViewCell class]]){ if ((indexPath.row % 2)==0) { [cell.contentView setBackgroundColor:[UIColor purpleColor]]; }else{ [cell.contentView setBackgroundColor:[UIColor whiteColor]]; } cell = (MainCell *) currentObject; break; } } }else { AsyncImageView* oldImage = (AsyncImageView*) [cell.contentView viewWithTag:999]; [oldImage removeFromSuperview]; }return cell; The problem is that when i do a rapid scroll, the background of cells become like the last 2 cell black, the first 2 cell white or something like this, but if i scroll slow works fine. I think the problem is the cache of reusableCell. Any ideas? TIA

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• Jasper exported to Excel ignoring background color?

  - by discgolfer

  Have you ever had alternating background colors in a Jasper report and then exported it to Excel? The Excel export seems to ignore the alternating color. I've got a Jasper report where the rows alternating background color using the procedure referenced HERE. When I preview it using the viewer or export to PDF it works -- but not when I export to Excel. I've tried using JRXlsExporter and JExcelApiExporter both to no avail. I think it might be a side-effect of how you have to make alternating row colors in Jasper, which I despise to begin with, but have found no other way. Thanks in advance!

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• Why am I getting null object reference error when saving (OnItemUpdating event) the first edit item

  - by craigmoliver

  I'm getting the error "Object reference not set to an instance of an object." when trying to reference a HiddenField (lvEditProjectSteps_hdnStepStatusId for future reference) from the EditItem during the OnItemUpdating event after the Update event fires in a ListView. This only occurs on the FIRST item in the ListView. I checked the source and the HTML is being rendered properly. ANY insight is appreciated! Thanks in advance... Source error: var lvEditProjectSteps_hdnStepStatusId = (HiddenField) lvEditProjectSteps.EditItem.FindControl("lvEditProjectSteps_hdnStepStatusId"); Here's the aspx side of the ListView: <asp:ListView ID="lvEditProjectSteps" runat="server" OnItemDataBound="lvEditProjectSteps_OnItemDataBound" OnItemUpdating="lvEditProjectSteps_OnItemUpdating" DataSourceID="odsEditProjectStep" DataKeyNames="Id"> <LayoutTemplate> <table class="standard-box-style" style="width:800px"> <thead> <tr> <th>&nbsp;</th> <th>&nbsp;</th> <th>Created</th> <th>Updated</th> </tr> </thead> <tbody> <asp:PlaceHolder ID="itemPlaceHolder" runat="server" /> </tbody> </table> </LayoutTemplate> <ItemTemplate> <tr> <td style="width:50px"<%# (Container.DisplayIndex % 2 == 0)?"":" class=\"row-alternating\"" %>> <asp:ImageButton ID="lvEditProjectSteps_btnEdit" runat="server" ImageUrl="~/admin/images/icons/edit.gif" AlternateText="Edit" SkinID="interfaceButton" CommandName="Edit" /> <asp:HiddenField ID="lvEditProjectSteps_hdnId" runat="server" Value='<%# Bind("Id")%>' /> <asp:HiddenField ID="lvEditProjectSteps_hdnStepStatusId" runat="server" Value='<%# Bind("StepStatusId")%>' /> <asp:HiddenField ID="lvEditProjectSteps_hdnStepStatusStepId" runat="server" Value='<%# Bind("StepStatus_StepId")%>' /> </td> <td style="width:30px"<%# (Container.DisplayIndex % 2 == 0)?"":" class=\"row-alternating\"" %>><asp:Image ID="imgStatus" runat="server" /></td> <td style="width:75px"<%# (Container.DisplayIndex % 2 == 0)?"":" class=\"row-alternating\"" %>><asp:Literal ID="litTsCreated" runat="server" /></td> <td style="width:75px"<%# (Container.DisplayIndex % 2 == 0)?"":" class=\"row-alternating\"" %>><asp:Literal ID="litTsUpdated" runat="server" /></td> </tr> </ItemTemplate> <EditItemTemplate> <tr> <td style="width:50px"<%# (Container.DisplayIndex % 2 == 0)?"":" class=\"row-alternating\"" %>> <asp:ImageButton ID="lvEditProjectSteps_btnUpdate" runat="server" ImageUrl="~/admin/images/icons/save.png" AlternateText="Save" SkinID="interfaceButton" CommandName="Update" ValidationGroup="EditProjectStepsSave" /> <asp:ImageButton ID="lvEditProjectSteps_btnCancel" runat="server" ImageUrl="~/admin/images/icons/cancel.png" AlternateText="Cancel" SkinID="interfaceButton" CommandName="Cancel" /> <asp:HiddenField ID="lvEditProjectSteps_hdnId" runat="server" Value='<%# Bind("Id")%>' /> <asp:HiddenField ID="lvEditProjectSteps_hdnStepStatusId" runat="server" Value='<%# Bind("StepStatusId")%>' /> <asp:HiddenField ID="lvEditProjectSteps_hdnStepStatusStepId" runat="server" Value='<%# Bind("StepStatus_StepId")%>' /> </td> <td style="width:180px" colspan="3"<%# (Container.DisplayIndex % 2 == 0)?"":" class=\"row-alternating\"" %>> <div><strong>Status</strong></div> <div class="radiobuttonlist-status"> <asp:RadioButtonList ID="lvEditProjectSteps_rblStatus" runat="server" RepeatDirection="Horizontal" AutoPostBack="true" OnSelectedIndexChanged="lvEditProjectSteps_rblStatus_OnSelectedIndexChanged"> <asp:ListItem Value="1"><img src="/images/icon/project-status/1.png" alt="Error" /></asp:ListItem> <asp:ListItem Value="2"><img src="/images/icon/project-status/2.png" alt="In Progress" /></asp:ListItem> <asp:ListItem Value="3"><img src="/images/icon/project-status/3.png" alt="Complete" /></asp:ListItem> </asp:RadioButtonList> <asp:RequiredFieldValidator ID="valRequired_lvEditProjectSteps_rblStatus" runat="server" ControlToValidate="lvEditProjectSteps_rblStatus" SetFocusOnError="true" Display="Dynamic" ErrorMessage="<br />^ required ^" ValidationGroup="EditProjectStepsSave" /> </div> </td> </tr> </EditItemTemplate> </asp:ListView> And the code-behind: protected void lvEditProjectSteps_OnItemDataBound(object sender, ListViewItemEventArgs e) { if (e.Item.ItemType == ListViewItemType.DataItem) { var info = (ProjectStepInfo)DataBinder.GetDataItem(e.Item); // View Item var litTsCreated = (Literal)e.Item.FindControl("litTsCreated"); var litTsUpdated = (Literal)e.Item.FindControl("litTsUpdated"); var imgStatus = (Image) e.Item.FindControl("imgStatus"); if (litTsCreated != null) litTsCreated.Text = String.Format("{0:d}", info.TsCreated); if (litTsUpdated != null) litTsUpdated.Text = String.Format("{0:d}", info.TsCreated); if (imgStatus != null) imgStatus.ImageUrl = String.Format("/images/icon/project-status/{0}.png", info.StepStatus_StatusId); // Edit Item var lvEditProjectSteps_rblStatus = (RadioButtonList) e.Item.FindControl("lvEditProjectSteps_rblStatus"); if (lvEditProjectSteps_rblStatus != null) lvEditProjectSteps_rblStatus.SelectedValue = info.StepStatus_StatusId.ToString(); } } protected void lvEditProjectSteps_OnItemUpdating(object sender, ListViewUpdateEventArgs e) { if (IsValid) { var oController = new Controller(); var lvEditProjectSteps_hdnStepStatusId = (HiddenField) lvEditProjectSteps.EditItem.FindControl("lvEditProjectSteps_hdnStepStatusId"); var lvEditProjectSteps_hdnStepStatusStepId = (HiddenField) lvEditProjectSteps.EditItem.FindControl("lvEditProjectSteps_hdnStepStatusStepId"); var lvEditProjectSteps_rblStatus = (RadioButtonList) lvEditProjectSteps.EditItem.FindControl("lvEditProjectSteps_rblStatus"); var infoStepStatus = oController.StepStatus_SelectOne_StepId_StatusId(Convert.ToInt32(lvEditProjectSteps_hdnStepStatusStepId.Value), Convert.ToInt32(lvEditProjectSteps_rblStatus.SelectedValue)); if (lvEditProjectSteps_hdnStepStatusId != null) { e.NewValues["ProjectId"] = Convert.ToInt32(lvEditProjectSteps_hdnProjectId.Value); e.NewValues["StepStatusId"] = infoStepStatus.Id; } else { Response.Write("cancel"); e.Cancel = true; } } else { Response.Write("cancel, not valid"); e.Cancel = true; } } protected void lvEditProjectSteps_rblStatus_OnSelectedIndexChanged(object sender, EventArgs e) { var oController = new Controller(); var rbl = (RadioButtonList)sender; var lvEditProjectSteps_txtText = (TextBox) rbl.NamingContainer.FindControl("lvEditProjectSteps_txtText"); var lvEditProjectSteps_txtComment = (TextBox)rbl.NamingContainer.FindControl("lvEditProjectSteps_txtComment"); var lvEditProjectSteps_hdnStepStatusStepId = (HiddenField) rbl.NamingContainer.FindControl("lvEditProjectSteps_hdnStepStatusStepId"); if (!String.IsNullOrEmpty(lvEditProjectSteps_hdnStepStatusStepId.Value) && lvEditProjectSteps_txtText != null && lvEditProjectSteps_txtComment != null) { var infoStep = oController.Step_SelectOne(Convert.ToInt32(lvEditProjectSteps_hdnStepStatusStepId.Value)); var infoStepStatus = oController.StepStatus_SelectOne_StepId_StatusId(Convert.ToInt32(lvEditProjectSteps_hdnStepStatusStepId.Value), Convert.ToInt32(rbl.SelectedValue)); lvEditProjectSteps_txtText.Text = infoStep.Name; lvEditProjectSteps_txtComment.Text = infoStepStatus.Text; } }

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• Why am I having so many problems installing Ubuntu 13.10 alongside Vista?

  - by Matt Gazaway

  I am trying to setup my laptop to dual boot Ubuntu 13.10 and Windows Vista. I get as far as the drive table and it either freezes up or I get an error saying "unable to satisfy partition parameters" or something very similar. Now I just have a black screen with alternating indications that a request for cache data failed and something to do with a "write through". Any ideas on what I might be doing wrong?

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• Silverlight Cream for December 07, 2010 -- #1004

  - by Dave Campbell

  In this Issue: András Velvárt, Kunal Chowdhury(-2-), AvraShow, Gill Cleeren, Ian T. Lackey, Richard Waddell, Joe McBride, Michael Crump, Xpert360, keyboardP, and Pete Vickers(-2-). Above the Fold: Silverlight: "Grouping Records in Silverlight DataGrid using PagedCollectionView" Kunal Chowdhury WP7: "Phone 7 Back Button and the ListPicker control" Ian T. Lackey Shoutouts: Colin Eberhardt has some Silverlight 5 Adoption Predictions you may want to check out. Michael Crump has a post up showing lots of the goodness of Silverlight 5 from the Firestarter... screenshots, code snippets, etc: Silverlight 5 – What’s New? (Including Screenshots & Code Snippets) Kunal Chowdhury has a pretty complete Silverlight 5 feature set from the Firestarter and an embedded copy of Scott Guthrie's kenote running on the page: New Features Announced for Silverlight 5 Beta From SilverlightCream.com: Just how productive is WP7 development compared to iOS, Android and mobile Web? András Velvárt blogged about a contest he took part in to build a WP7 app in 1-1/2 hours without any prior knowledge of it's funtion. He and his team-mate were pitted against other teams on Android, IOS, and mobile Web... guess who got (almost) their entire app running? ... just too cool Andras! ... Grouping Records in Silverlight DataGrid using PagedCollectionView Kunal Chowdhury has a couple good posts up, this first one is on using the PagedCollectionView to group the records in a DataGrid... code included. Filtering Records in Silverlight DataGrid using PagedCollectionView Kunal Chowdhury then continues with another post on the PagedCollectionView only this time is showing how to do some filtering. DeepZoom Tips and Techniques AvraShow has a post up discussing using DeepZoom to explore, in his case, a Printed Circuit Board, with information about how he proceeded in doing that, and some tips and techniques along the way. The validation story in Silverlight (Part 2) Gill Cleeren has Part 2 of his Silverlight Validation series up at SilverlightShow. This post gets into IDataErrorInfo and INotifyDataErrorInfo. Lots of code and the example is available for download. Phone 7 Back Button and the ListPicker control Ian T. Lackey has a post up about the WP7 backbutton and what can get a failure from the Marketplace in that area, and how that applies to the ListPicker as well. Very Simple Example of ICommand CanExecute Method and CanExecuteChanged Event Richard Waddell has a nice detailed tutorial on ICommand and dealing with CanExecute... lots of Blend love in this post. Providing an Alternating Background Color for an ItemsControl Joe McBride has a post up discussing putting an alternating background color on an ItemsControl... you know, how you do on a grid... interesting idea, and all the code... Pimp my Silverlight Firestarter Michael Crump has a great Firestarter post up ... where and how to get the videos, the labs... a good Firestarter resource for sure. Adventures with PivotViewer Part 7: Slider control Xpert360 has part 7 of the PivotViewer series they're doing up. This time they're demonstrating taking programmatic control of the Zoom slider. Creating Transparent Lockscreen Wallpapers for WP7 I don't know keyboardP's name, but he's got a cool post up about getting an image up for the WP7 lock screen that has transparent regions on it... pretty cool actually. Windows Phone 7 Linq to XML 'strangeness' Pete Vickers has a post up describing a problem he found with Linq to XML on WP7. He even has a demo app that has the problem, and the fix... and it's all downloadable. Windows Phone 7 multi-line radio buttons Pete Vickers has another quick post up on radio buttons with so much text that it needs wrapping ... this is for WP7, but applies to Silverlight in general. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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• Style row banding and selection in tr:table using CSS

  - by Alex Larzelere

  I've got a tr:table that I need to style using CSS. All the normal style functions of a table are working, but row banding and row selection aren't coming up. When I view the rendered source, I'm not seeing a difference in the rows for an id or class to grab on to, and the official documentation doesn't have any attributes for declaring a style class for either. Is this possible and if so what do I need to do to get my CSS to grab onto it? <tr:table id="myTable" value="#{tableValues}" rowBandingInterval="1"> <tr:column> ##Stuff## </tr:column> <tr:column> ##Stuff## </tr:column> <tr:column> ##Stuff## </tr:column> </tr:table> Edit Let me try to clairfy what's happening. First, using the declaration above tells jsf to generate a table, and the attribute rowBandingInterval tells it to give each row alternating colors (If it was set to 2, then it would do 2 rows one color, 2 rows another, 2 rows the original, etc.) Once the page gets rendered into standard html, trinidad (and jsf) apply their own classes and IDs to the html. My normal procedure is to look at the rendered html, find the class that it is appling and add CSS rules for it. However in this case, no additional styles are added (nothing in the rendered html denotes one row to be different from another). So the question is, how do I tell trinidad to either give alternating rows and the user selected row different classes/IDs for me to grab on to with CSS?

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• 3+ monitors, nvidia + intel graphics

  - by gozzilli

  I have seen lots of different posts on this issue, but I cannot figure out what to do. I hope we can collect the available information in one place, so that they can be useful for others. Is it possible to have multiple (3+) monitors running on two different graphics cards? I have 1x nVidia GeForce GTX 550 with 2 DVI ports and 1x Intel integrated graphics, with 2 DVI ports. I understand that they would be running on different instances of X servers. Is that correct? Could someone point me in the right direction to start? On Windows it's so simple, there is no additional thing to do other than going in display preferences and activating all 3+ monitors. They can even be laid out alternating one monitor from one graphics card with another monitor from the other card.

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• How Would I create alternate players (Turn base Event)

  - by Blue

  The picture above shows 2 players. Each containing 3 characters. I want to know how to make a Turn based event starting with player 1 alternating turns with player 2. And in every alternation each character gets a turn. If a character dies, the next character on the same team goes, and so on. How would I create this? Is there a tutorial? I haven't made any turn-based games so I don't know how to program these kinds of stuff.

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• how to install ubuntu on imac

  - by leviathan

  i need help! im still new to this. i really need help, i have an imac.. (it's corrupted. when i try to open it, it shows a question mark alternating with a smiley) Model Family: iMac G5 Processor: 1.8GHz G5 (PowerPC 970fx) Manufacturer: Motorola of CPUs: 1 Size: 17" Finish: Matte Resolution: 1440x900 Backlight: CCFL Base Memory: 256MB PC3200 DIMM Max Memory: 2GB Memory Slots: 2 Brand: Apple Original OS: Mac OS X 10.3.5 i think it's vintage. haha. but i want to fix it. first, i think the hard drive is broken (pretty much corrupted) but i tried to install a xubuntu os on it because i don't have any other disc. but i think xubuntu is not compatible because i can't seem to get pass through the partitioning part. could some one please help..

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• matplotlib - zebra-stripe a figure's background color?

  - by jawonlee

  I'm building a simple line chart with matplotlib, and I'd like to zebra-stripe the background of the chart, so that each alternating row is colored differently. Is there a way to do this? My chart already has gridding, and has major ticks only.

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• Managing conflicting ivy repositories (in eclipse)

  - by Stephen

  I've got eclipse workspaces for my full time job and my home test work that are both set up with ivy (and using ivyDE). However, I'm finding that I'm getting strange behaviour and conflicts between the different workspaces - issues like not being able to find certain dependencies, or not compiling etc. Is there a way in ivy or ivyDE to set the home .ivy2 directory so that I can split my workspaces? At the moment, I'm alternating different directories for my .ivy2 cache.

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• CSS :nth-child Equation

  - by Meander365

  I have an unordered list and each li makes up one item in a two column layout: col1 col2 1 2 3 4 5 6 7 8 9 10 11 12 I need to have an alternating background colour for each item BUT NOT so each item in one column is the same. So : 1,4,5,8,9,11 will have one colour; and 2,3,6,7,10,12 will have another colour. Can this be achieved with one :nth-child rule? Thanks!

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• Fixing striped printing from inkjet printer

  - by JW

  My Canon IP3000 printer recently started having problems with the black ink. Anything printed in black comes out striped, alternating between dark and light. An example is below. I've tried the following: Running the printer utility's head cleaning and "deep cleaning" a few times Running the utility's head alignment Replacing the ink cartridge with a new one Removing the print head and cleaning the bottom with denatured alcohol Anything else I can try before throwing this thing away? I'm considering buying a replacement print head, but is this likely to be solved by replacing the head?

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• Aironet 1200's Auto-Channel Feature: When should it be used?

  - by Josh Brower

  In our building we have around 25 1200 series Aironets, with a bit of overlap in some areas. Up until this point, we have had them deployed in alternating 1/6/11 channels, but we are wondering if we would get better performance if we used the auto-channel select feature. In looking around, I have seen comments that this feature should not be used as the WAP does a channel scan only on the radio startup, but I have not found this in any Cisco docs. Anybody have anymore information, or real-world experience with this feature? Thanks! -Josh

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• Thunderbird: change selected email highlight color (when no focus)

  - by Rabarberski

  Is it possible to change, in the message list of Thunderbird 3.0, the highlight color of the selected message when the list does not have the focus? The highlight color for the selected row is blue when the list has the focus, this is very clear. But when the list does not have the focus (e.g. after when you click in the message preview area), the highlight color is dark grey. However, this dark grey doesn't really stand out against the alternating row highlighting in the list (at least not on my laptop's LCD screen), making it difficult for me to quickly locate the message I've selected. So, any way to change this dark grey highlighting?

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• Can I use a cheap inverter for my laptop?

  - by Georg

  I'm going to travel in a car this summer. It would be very nice if I could charge my laptop using the cigarette lighter. Because my computer is from Apple, there's no way to directly connect the two, therefore I need an inverter that provides 120V alternating current. There are many different models, ranging from very cheap to really expensive. The wave forms are: (from most expensive to cheapest) sine modified sine trapezoid square Can I use just any inverter or does it have to be a sine inverter? If so, what happens to my computer in case I use the wrong one. The laptop is a MacBook witch needs 60W.

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• Thunderbird: possible to change selected email highlight color (when no focus) ?

  - by Rabarberski

  Is it possible to change, in the message list of Thunderbird 3.0, the highlight color of the selected message when the list does not have the focus? The highlight color for the selected row is blue when the list has the focus, this is very clear. But when the list does not have the focus (e.g. after when you click in the message preview area), the highlight color is dark grey. However, this dark grey doesn't really stand out against the alternating row highlighting in the list (at least not on my laptop's LCD screen), making it difficult for me to quickly locate the message I've selected. So, any way to change this dark grey highlighting?

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• Headphones stopped working in Windows (working fine in other OS)

  - by arnab321

  All of a sudden, my headphones stopped working with windows 8 in my laptop. Sound plays fine through built in speakers. Its not a problem with the hardware, because, I dual boot ubuntu and sound plays fine in Ubuntu. These are the things I have tried: - Restarting and blah blah. Restarted 20 times i think, alternating windows and ubuntu. - Uninstalled and reinstalled Realtek drivers. - Troubleshooting from control panel (it says "coudnt identify problem") What might be the problem?

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• How does a Promise FastTrak 133 interleave a striped array?

  - by Jemenake

  I co-worker had two drives configured as a stripe on a motherboard with an on-board Promise FastTrak 133. The motherboard failed, and we've been unable to find any others with an on-board Promise controller which can recognize the array. With Linux or some disk editors, I can see data on both drives... and I want to see if I can combine the data from both drives onto a single, larger drive. But I need to know how that information is interleaved on the drives. I've tried dmraid on Linux, but that doesn't recognize the drives as an array. I guess I could just try combining alternating blocks from the drives, starting with a block size of 256B and keep doubling until I get a result that looks intact. But I'd like to avoid that if someone already knows how Promise controllers spread the data over a striped array.

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• High level vs. low level programming. Do I really have to choose?

  - by EpsilonVector

  Every once in a while I'm asked in interviews which I like the best- low level or high level. It seems to me that the implicit message is that they are both a specialty and they want to know which direction I'm heading. The trouble is, I seem to like both. Low level is extremely challenging and often requires a great deal of esoteric knowledge. High level is where all the sexy things happen: applications that people use directly, results that can be easily demonstrated (showed off) in a way that is accessible to everybody, and you get to work with really advanced tools and interact with new technologies. I would really love to do both, even if it means alternating between them (I doubt there are jobs that will let me do both simultaneously), but I'm guessing that the industry rewards specialists more than generalists. Will it really be problematic career wise if I never choose one over the other? Is it practical to alternate between the two in the sense that if I were to leave a job doing one of them, I should experience no "friction" trying to get a job doing the other (assuming I'm reasonably in the loop)? Are there career opportunities where you get to do both? Do I really have to choose one over the other?

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• What is the correct and most efficient approach of streaming vertex data?

  - by Martijn Courteaux

  Usually, I do this in my current OpenGL ES project (for iOS): Initialization: Create two VBO's and one IndexBuffer (since I will use the same indices), same size. Create two VAO's and configure them, both bound to the same Index Buffer. Each frame: Choose a VBO/VAO couple. (Different from the previous frame, so I'm alternating.) Bind that VBO Upload new data using glBufferSubData(GL_ARRAY_BUFFER, ...). Bind the VAO Render my stuff using glDrawElements(GL_***, ...); Unbind the VAO However, someone told me to avoid uploading data (step 3) and render immediately the new data (step 5). I should avoid this, because the glDrawElements call will stall until the buffer is effectively uploaded to VRAM. So he suggested to draw all my geometry I uploaded the previous frame and upload in the current frame what will be drawn in the next frame. Thus, everything is rendered with the delay of one frame. Is this true or am I using the good approach to work with streaming vertex data? (I do know that the pipeline will stall the other way around. Ie: when you draw and immediately try to change the buffer data. But I'm not doing that, since I implemented double buffering.)

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• XNA texture stretching at extreme coordinates

  - by Shaun Hamman

  I was toying around with infinitely scrolling 2D textures using the XNA framework and came across a rather strange observation. Using the basic draw code: spriteBatch.Begin(SpriteSortMode.Deferred, null, SamplerState.PointWrap, null, null); spriteBatch.Draw(texture, Vector2.Zero, sourceRect, Color.White, 0.0f, Vector2.Zero, 2.0f, SpriteEffects.None, 1.0f); spriteBatch.End(); with a small 32x32 texture and a sourceRect defined as: sourceRect = new Rectangle(0, 0, Window.ClientBounds.Width, Window.ClientBounds.Height); I was able to scroll the texture across the window infinitely by changing the X and Y coordinates of the sourceRect. Playing with different coordinate locations, I noticed that if I made either of the coordinates too large, the texture no longer drew and was instead replaced by either a flat color or alternating bands of color. Tracing the coordinates back down, I found the following at around (0, -16,777,000): As you can see, the texture in the top half of the image is stretched vertically. My question is why is this occurring? Certainly I can do things like bind the x/y position to some low multiple of 32 to give the same effect without this occurring, so fixing it isn't an issue, but I'm curious about why this happens. My initial thought was perhaps it was overflowing the coordinate value or some such thing, but looking at a data type size chart, the next closest below is an unsigned short with a range of about 32,000, and above is an unsigned int with a range of around 2,000,000,000 so that isn't likely the cause.

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• Interesting fault attempting to install Ubuntu 12.0.4.3 OR 13.10 on MSI GS70 2OD-001US

  - by cjaredrun

  Attempting to install Ubuntu on an MSI GS70 2OD-001US notebook pre-installed with Windows 8. For the record this is what I have attempted: All cases were attempted with Ubuntu 12.0.4.3 AND 13.10 images via USB drives Case 1 - Attempt no changes and simply boot from USB Result: It seems to want to work initially. The Ubuntu logo pops up and the dots start moving. After a few seconds the dots freeze and this screen is shown: http://i.imgur.com/C7pyMRk.jpg Case 2 - Start playing with BIOS - In Windows turning off fast boot - In BIOS turning off Secure boot - In BIOS turning off UEFI and selecting LEGACY Result: Brought to a black screen with a - blinking at me. Case 3 - Alternating BIOS settings - In Windows turning off fast boot - In BIOS turning off Secure boot - in BIOS turning off UEFI and selecting UEFI with CSM Result: Brought to a black screen no other indication of change. It's pretty frustrating to feel locked out of a laptop that I have paid good money for, I'm sure I am not alone in that case. It does however appear that there has been some success, so I am hopeful that someone might be able to help me. FYI: Dual booting is not necessary for me, if that helps at all... I'm not sure if this is a reasonable option, but if I completely wipe clean the hdds, no particle of Windows at all, would this still be a problem? Also would opening up the laptop and replacing the HDDS with brand new ones be a solution as well? Thanks for any input or suggestions.

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• Ubuntu 12.04 login screen flickers. “Could not write bytes: broken pipes”

  - by Brayn

  I use Ubuntu 12.04 x64 with a dual-boot setup. Yesterday it worked fine but this morning when I attempted to boot it gets to the login screen and then it just flickers, alternating between the login screen and the console showing boot items (mainly Apache, the last one being "Battery status" although it's a desktop) all with [OK] status. The only error that I can see is: "Could not write bytes: broken pipes" on top of the screen. The only things I can think of that could cause this are: This morning I had a removable hdd plugged in during boot time, which I usually don't have Yesterday I've installed Dwarven Fortress that requires some x32 libraries so I've installed ia32 using synaptic. As far as I know this shouldn't brake the system but I didn't reboot yesterday so I can't be sure. I've tried booting in recovery mode and tried running the utils there but still no luck. I've ran out of ideas. Thanks. EDIT: Forgot to mention that all partitions have plenty of free space EDIT2: In the end I just reinstalled Ubuntu as time was of the essence.

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