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• Qt Graphics et performance - la folie est de mettre en forme le même texte, un article de Eskil Abrahamsen Blomfeldt, traduit par Guillaume Belz

  Le 11 décembre 2009, la documentation de QPainter subissait un énorme ajout concernant l'optimisation de son utilisation. En effet, le bon usage de cet outil n'était pas accessible à tous, il n'était pas présenté dans la documentation. Ceci ne fut qu'un prétexte à une série d'articles sur l'optimisation de QPainter et de Qt Graphics en général. Voici donc le premier article de cette série, les autres sont en préparation : Qt Graphics et performances : ce qui est critique et ce qui ne l'est pas Pensez-vous que cet ajout à la documentation de QPainter sera utile ? Trouvez-vous les performances de vos applications trop faibles ?...

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• Qt Graphics et performance - velours et QML Scene Graph, un article de Gunnar, traduit par Thibaut Cuvelier

  Le 11 décembre 2009, la documentation de QPainter subissait un énorme ajout concernant l'optimisation de son utilisation. En effet, le bon usage de cet outil n'était pas accessible à tous, il n'était pas présenté dans la documentation. Ceci ne fut qu'un prétexte à une série d'articles sur l'optimisation de QPainter et de Qt Graphics en général. Voici donc le premier article de cette série, les autres sont en préparation : Qt Graphics et performances : ce qui est critique et ce qui ne l'est pas Pensez-vous que cet ajout à la documentation de QPainter sera utile ? Trouvez-vous les performances de vos applications trop faibles ?...

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• Installed nvidia graphics driver (current, 8800GTX) has issues, how do I disable/uninstall it?

  - by Craig

  I installed the restricted nvidia graphics driver (current) on my computer, then restarted to finish the install. Upon reboot I got some prompt about there being an X server problem, It told me to try auto-fixing or something, none of its options worked, they all failed horribly and caused the computer to crash immediately on selecting any of them. I decided to re-install. Again I got in, downloaded updates, and installed the driver. This time upon boot the X-server immediately crashes and im brought to tty1. If I hit ctrl+alt+F7 I see a beige-background prompt says the usual about checking battery state, pulse audio etc., you see right before the x-server starts. According to X (if I do sudo startx) there are no displays, and the nvidia graphics driver is not working. First off, how do I set ubuntu back to the default driver (I have only a CLI right now -.-), then how do I install a more appropriate nvidia driver

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• JPanel Appears Behind JMenuBar

  - by Matt H

  import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; @SuppressWarnings("serial") public class Main extends JFrame { final int FRAME_HEIGHT = 400; final int FRAME_WIDTH = 400; public static void main(String args[]) { new Main(); } public Main() { super("Game"); GameCanvas canvas = new GameCanvas(); JMenuBar menuBar = new JMenuBar(); JMenu fileMenu = new JMenu("File"); JMenuItem startMenuItem = new JMenuItem("Pause"); menuBar.add(fileMenu); fileMenu.add(startMenuItem); super.setVisible(true); super.setSize(FRAME_WIDTH, FRAME_WIDTH); super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); super.setJMenuBar(menuBar); } } import java.awt.Canvas; import java.awt.Graphics; import javax.swing.JPanel; @SuppressWarnings("serial") public class GameCanvas extends JPanel { public void paint(Graphics g) { g.drawString("hI", 0, 0); } } This code causes the string to appear behind the JMenuBar. To see the string, you must draw it at (0,10). I'm sure this must be something simple, so do you guys have any ideas?

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• How to create a CGBitmapContext which works for Retina display and not wasting space for regular display?

  - by ????

  Is it true that if it is in UIKit, including drawRect, the HD aspect of Retina display is automatically handled? So does that mean in drawRect, the current graphics context for a 1024 x 768 view is actually a 2048 x 1536 pixel Bitmap context? (is there a way to print this size out to verify it). We actually enjoy the luxury of 1 point = 4 pixels automatically handled for us. However, if we use CGBitmapContextCreate, then those will really be pixels, not points? (at least if we provide a data buffer for that bitmap, the size is not for the higher resolution, but for the standard resolution, and even if we pass NULL as the buffer so that CGBitmapContextCreate handles the buffer for us, the size probably is the same as if we pass in a data buffer, and it is just standard resolution, not Retina's resolution). We can always create 2048 x 1536 for iPad 1 and iPad 2 as well as the New iPad, but it will waste memory and processor and GPU power, as it is only needed for the New iPad. So do we have to use a if () { } else { } to create such a bitmap context and how do we actually do so? And all our code CGContextMoveToPoint has to be adjusted for Retina display to use x * 2 and y * 2 vs non-retina display of just using x, y as well? That can be quite messy for the code. (or maybe we can define a local variable scaleFactor and set it to 1 for standard resolution and 2 if it is retina, so our x and y will always be x * scaleFactor, y * scaleFactor instead of just x and y.) It seems that UIGraphicsBeginImageContextWithOptions can create one for Retina automatically if the scale of 0.0 is passed in, but I don't think it can be used if I need to create the context and keep it (and using ivar or property of UIViewController to hold it). If I don't release it using UIGraphicsEndImageContext, then it stays in the graphics context stack, so it seems like I have to use CGBitmapContextCreate instead. (or do we just let it stay at the bottom of the stack and not worry about it?)

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• Double buffering C#

  - by LmSNe

  Hey, I'm trying to implement the following method: void Ball::DrawOn(Graphics g); The method should draw all previous locations(stored in a queue) of the ball and finally the current location. I don't know if that matters, but I print the previous locations using g.DrawEllipse(...) and the current location using g.FillEllipse(...). The question is, that as you could imagine there is a lot of drawing to be done and thus the display starts to flicker much. I had searched for a way to double buffer, but all I could find is these 2 ways: 1) System.Windows.Forms.Control.DoubleBuffered = true; 2) SetStyle(ControlStyles.DoubleBuffer | ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true); while trying to use the first, I get the an error explaining that from in this method the Property DoubleBuffered is inaccessible due to its protection level. While I can't figure how to use the SetStyle method. Is it possible at all to double buffer while all the access I have is to the Graphics Object I get as input in the method? Thanks in Advance,

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• override OnPaint for a Windows.Forms.Control Flickering?

  - by Danpe

  I create a new Control and overided the OnPaint event: protected override void OnPaint(PaintEventArgs e) { Graphics g = e.Graphics; _ammo = PitControl.Ammo; var AmmoSize = g.MeasureString(_ammo.ToString(), Properties.Settings.Default.AmmoFont).ToSize(); g.DrawString(_ammo.ToString(), Properties.Settings.Default.AmmoFont, Brushes.WhiteSmoke, Ammo.Location.X - 1, Ammo.Location.Y + Ammo.Height / 2 - AmmoSize.Height / 2 + 1); Rectangle DrawAmmo = new Rectangle(this.Width - Ammo.Height - _margin, Ammo.Location.Y, Ammo.Height, Ammo.Height); for (int i = _ammo; i > 0; i--) if (i % 2 == 0) g.DrawLine(_ammoPen, Ammo.Location.X + Ammo.Width - i - 1, Ammo.Location.Y + 3, Ammo.Location.X + Ammo.Width - i - 1, Ammo.Location.Y + Ammo.Height - 3); g.DrawRectangle(Pens.Orange, Ammo); g.DrawImage(Properties.Resources.ammunition, DrawAmmo.Location.X, DrawAmmo.Location.Y, DrawAmmo.Height, DrawAmmo.Height); } The problem is when i'm changing the Ammo then all the control flicks. It doesn't look good. Anyway to make the lines that i draw on this line: g.DrawLine(_ammoPen, Ammo.Location.X + Ammo.Width - i - 1, Ammo.Location.Y + 3, Ammo.Location.X + Ammo.Width - i - 1, Ammo.Location.Y + Ammo.Height - 3); Just disapeare when ammo is changing ?

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• How do I detect proximity of the mouse pointer to a line in Flex?

  - by Hanno Fietz

  I'm working on a charting UI in Flex. One of the features I want to implement is "snapping" of the mousepointer to the data points in the diagram. I. e., if the user hovers the mouse pointer over a line diagram and gets close to the data point, I want the pointer to move to the exact coordinates and show a marker, like this: Currently, the lines are drawn on a Shape, using the Graphics API. The Shape is a child DisplayObject of a custom UIComponent subclass with the exact same dimensions. This means, I already get mouseOver events on the parent of the diagram's canvas. Now I need a way to detect if the pointer is close to one of the data points. I. e. I need an answer to the question "Which data points lie within a radius of x pixels from my current position and which of them is closest?" upon each move of the mouse. I can think of the following possibilities: draw the lines not as simple lines in the graphics API, but as more advanced objects that can have their own mouseOver events. However, I want the snapping to trigger before the mouse is actually over the line. check the original data for possible candidates upon each mouse movement. Using binary search, I might be able to reduce the number of items I have to compare sufficently. prepare some kind of new data structure from the raw data that makes the above search more efficient. I don't know how that would look like. I'm guessing this is a pretty standard problem for a number of applications, but probably the actual code usually is inside of some framework. Is there anything I can read about this topic?

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• How to delete Drawn Line in java?

  - by Jeyjey

  Hello Folks, well this is my code: import javax.swing.; import javax.; import java.awt.; import java.awt.Color; import java.awt.Graphics.; import java.awt.event.*; import javax.swing.UIManager; public class SimpleGUI extends JFrame{ public SimpleGUI(){ this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) ; } public void go(){ Drawpanel = new Mypanel(); JFrame frame = new JFrame("Chasing Line"); frame.getContentPane().add(BorderLayout.CENTER, Drawpanel); frame.setSize(300,300); frame.setVisible(true); Drawpanel.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() { public void mouseMoved(java.awt.event.MouseEvent evt) { DrawpanelMouseMoved(evt); } }); } public void DrawpanelMouseMoved(java.awt.event.MouseEvent evt) { xpos=evt.getX(); ypos=evt.getY(); System.out.println("Coordinates : X :"+ xpos+"Y: "+ypos); Drawpanel.paintImage(xpos,ypos); } class Mypanel extends JPanel{ public void paintImage(int xpost,int ypost){ Graphics d = getGraphics(); d.setColor(Color.black); d.drawLine(xpost, 0, xpost, this.getHeight()); d.setColor(Color.red); d.drawLine(0, ypost, this.getWidth(),ypost); this.validate(); } } // end the inner class public static void main(String[] args){ try { UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); } catch(Exception e) { System.err.println("Look and feel not set"); } SimpleGUI win = new SimpleGUI(); win.go(); } Mypanel Drawpanel; private int xpos=0; private int ypos=0; } // close SimpleGUI class The problem is how can i delete the old lines?, i mea,make only the current x and y lines appear on the screen, make the intersection between both lines "follow" the mouse pointer. thanks for any reply.

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• Is 1GB RAM with integrated graphics sufficient for Unity 3D on 12.04?

  - by Anwar Shah

  I have been using Ubuntu since Hardy Heron (8.04). I used Natty, Oneiric with Unity. But When I recently (more than 1 month now) upgraded My Ubuntu to Precise (12.04), the performance of my laptop is not satisfactory. It is too unresponsive compared to older releases. For example, the Unity in 12.04 is very unresponsive. Sometimes, it requires 2 seconds to show up the dash (which was not the case with Natty, though people always saying that Natty's version of Unity is buggiest). I am assuming that, May be my 1GB RAM now becomes too low to run Unity of Precise. But I also think, Since Unity is improved in Precise, It may not be the case. So, I am not sure. Do you have any ideas? Will upgrading RAM fix it? How much I need if upgrade is required? Laptop model: "Lenovo 3000 Y410" Graphic : "Intel GMA X3100" on Intel 965GM Chipset. RAM/Memory : "1 GB DDR2" (1 slot empty). Swap space : 1.1GB Resolution: 1280x800 widescreen Shared RAM for Graphics: 256 MB as below output suggests $ dmesg | grep AGP [ 0.825548] agpgart-intel 0000:00:00.0: AGP aperture is 256M @ 0xd0000000

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• What is the *right* way to use gnome-shell integrated chat?

  - by stevejb

  Please bear with me as I am still figuring out how to use gnome-shell. My question concerns how to use the integrated chat correctly. I have the following questions: 1) When people chat with me, it pops up as a notification on the hidden bar at the bottom of the screen, and then that chat stays there so I can access it later. How do I initiate a chat in this manner, without opening an empathy window? What I have been doing is Hitting super key Typing in the person's name, which brings up contacts Initiate the chat using empathy Immediately close the chat window When the person responds, it comes through as a notification. I then proceed to interact with the chat this way. 2) What is the keyboard shortcut for bringing up the notifications bar? Ideally, I would like to have the following experience Use some keyboard shortcut to bring up notifications Begin typing the name of the notification that I wish to investigate, and have the matching work in a fuzzy manner, much like Ido mode's buffer switching matching in Emacs When then right name is matched, I hit enter and then bring up the chat with that person as that popup notification. Are these behaviours supported? If not, I would be happy to work on implementing them. I am an experienced programmer, but not familiar with gnome-shell. If someone would point me in the right direction in terms of if this behaviour is supported, or where in the gnome-shell framework would I add to to get this behaviour, I would really appreciate it. Thanks!

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• Visual Studio 2008 built-in web server needs integrated pipeline mode - How?

  - by jdk

  Using Visual Studio 2008 and built-in web server. In a Web Handler .ashx file public void ProcessRequest(HttpContext context) { context.Response.ContentType = MimeType_text_xvcard; context.Response.Headers.Add(HttpHeader_ContentLength, "2138"); when I try to add an HTTP header I get the exception: This operation requires IIS integrated pipeline mode. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.PlatformNotSupportedException: This operation requires IIS integrated pipeline mode. I can find information about this error on the Internet but need specific info about how to presumably enable Integrated Pipeline mode (through web.config?) to allow HTTP headers to be manipulated. How do do I put the built-in web server into integrated pipeline mode? Note: Not using full-fledged IIS

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• Is integrated graphics card Radeon HD 4200 capable to handle full HD?

  - by develroot

  I enjoy my integrated graphics card Radeon HD 4200 at resolution of 1280x1024 pixels on a 19" inches LG Flatron (5:4 aspect ratio) (playing FIFA 10 at max resolution, max quality). But recently i decided to upgrade my monitor and to get an 24" inches BENQ, 1920x1080, fullHD. Would I experience any problems with that graphics card on a such a big monitor? Usually I don't play games, just movies/music/and of programming, but it would be nice to be able to play some Counter Strike without artifacts.

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• Netbook performance - 1.33 GHz vs 1.6/1.66 GHz Atom

  - by Imran

  All new 11" netbooks seem to carry 1.33 GHz Atom Z520 CPU instead of 1.6/1.66 GHz Atom N270/N280. The screen resolution of 11" netbooks make them very appealing, but I'm a bit concerned about their performance as they carry a slower CPU than the 1.6GHz Atom, which isn't a great performer in the first place. Is there any significant difference in performance between 1.33 GHz and 1.6/1.66 GHz Atom processors in day to day usage? Are any of those fast enough to decode 720p x264 video? (When paired with typical Intel GMA platform and software decoder like ffdshow/CoreAVC of course, not with Nvidia Ion platform)

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• Any software transforming broken lines into curves?

  - by user32931

  Hello, do you know of any software that would help me transform a broken line into a curved line? For example, I have an octagon or a heptagon and I want it to be transformed into something resembling a circle. if you know such software, please, let me know. Thank You! Update A: Here is an image from the tutorial given to me by Jamie Keeling (right now it's the first answer below). At least the picture there represents what I want. In that tutorial this process is called "flattening paths". I will try to put that image right here, but if it doesn't get displayed, you can find it by this URL: http://msdn.microsoft.com/en-us/library/ms536364%28v=VS.85%29.aspx The red line in the picture is what I would want to submit, and the blue line is what I would want to get in the end:

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• Inkscape: how to create inner border?

  - by Anton

  I create figure and set border width to 1px. My image actual size is 100px. But with border this is 102px. How to set inner border instead of o*uther border*? In Protoshop I can select type of border - inner, outer or center. But in Inkscape I not found this option. Please, help me. Thanks!

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• Program for drawing with pen tablet, like Salman Khan's one.

  - by Halst

  Hi, I do a lot of sketching with my pen-tablet. I use MS Paint in Windows 7, and it is just perfect except for anti-aliasing. I found some videos of Salman Khan, where his sketching is really smooth and anti-aliased. Do you know what program he might use? You can see a bit of its interface here: http://www.khanacademy.org/press/chronicle.html and some more: http:/www.khanacademy.org/ http:/khanexercises.appspot.com/video?v=GW8ZPjGlk24 Else, you can recommend me something else. I hope to find something like MS Paint in Windows 7, but anti-aliased, or whatever. PS. Sorry for awkward links - newbies are allowed only 1 link per post

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• Should Windows Multipoint Server stations on individual video cards support hardware video acceleration?

  - by villares

  I've set up a test machine with multiple PCI-e nVidia GF440 Video cards and installed Windows Multipoint Server 2011. I use the same kind of hardware set up with a BeTwin multiseat solution to create a class lab for Google SketchUp teaching (highly OpenGL dependent) and it works ok. On the Multipoint Windows test machine the drivers seem to be installed OK but I don´t seem to get any hardware video acceleration. Is this a intrinsic limitation of this solution or am I doing something wrong?

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• Matrox QID PCIe LP and Win 7 x64

  - by Dokie

  Does anyone know if I can use my Matrox QID PCIe LP multi-monitor card on Windows 7 x64?

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• Video Card needs additional mounting support

  - by Sean

  We are creating a fairly decent system with crossfire. The issue we are having is apparently the video cards are physically to heavy to be supported purely by the motherboard and case mounts. Whenever we have the case horizontal everything works fine however when we bring the case upright the computer stops working. Relevant Info: Video Cards (2) - Sapphire 5870 (http://www.newegg.com/Product/Product.aspx?Item=N82E16814102856) MotherBoard - Asus M4A79T Deluxe Case - CoolerMaster 922 HAF To me it looks as if an additional support bracket that could hold up the end of the card would be required (included with the viideo cards!!!) Does anyone have any experience with this.

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• 3 monitors + a TV on a single card with Eyefinity?

  - by Paul Accisano

  Greetings all, Right now I have a fairly standard video card with 2 DVI ports, one powering my single monitor and another powering my HDTV (with a DVI-to-HDMI cable), which are in separate rooms. I never need to have my monitor and TV active at the same time. I'm looking into a possible computer upgrade. I'd like to know if the following situation is possible. I want three monitors on my desk powered by a single card, which I hear these new Eyefinity cards are capable of. But, I also want my TV hooked up. At any given time, I would want either my three monitors active or my TV active, never both at once. So it seems to me it might be possible to do this all a single 3-port card with a splitter of some kind. Is this possible? What hardware would I need? Thanks!

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• Acer makes monitor go to power safe mode unless in safe mode

  - by Babyfriend

  I have an acer aspire x3200 Monitor says no input signal (go to power safe mode) I was only able to use computer in safe mode The computer was on (power safe mode) for two weeks. The monitor is ok with another desktop I tried with a different monitor, same message (monitor goes to power safe mode) Why is this happening and if it's my video card probLem will I be able to replace the video card and solve it? It's currently using GeForce 8200 The NVIDIA® GeForce® 8200 motherboard GPU provides DirectX® 10 and HD movies to everyone. System is Windows Vista™ Thanks

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• What software did Joel use to get this type of drawing?

  - by overtherainbow

  Hello I have no graphic skills and would like to create drawings that look like this, ie. it gives the impression that it was hand-drawn rather than done with a computer. Do you know what Windows application lets users create drawings like this? PhotoShop + drawing skills? Thank you.

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• How to install windows without graphic's driver?

  - by Mike Redford

  My notebook's(Compaq Presario V5000) graphic card damaged last week and after that it will be restarted when I want to boot. So I tested it via windows live, and it booted from CD without any problem (as you know in win live, the graphic card doesn't recognize, and in setting of graphic card write : unknown ) Now my question : Is there anyway to install windows without any graphic driver please ?for example, Should I delete some installation files ?! PS : I tested Windows XP , VISTA and 7 but, when it goes to GUI installation restarted again :( Thanks for your help

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• Need to Connect 2 HDMI between Onboard and Add-In GPUs - What's the consequences?

  - by jmalais

  If i plug a second hdmi cable into my onboard video output (my dedicated add-in only has one hdmi port) will it use my video card or the onboard for that display? Also, what is the difference in quality between HDMI and DVI? I do have a DVI to HDMI adapter and cable that I could use alternatively if the above is not in my best interest. This is a gaming related question as I will be gaming off the two displays, hopefully in the highest of quality.

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