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  • How to implement "circular side-scrolling" in my game?

    - by Mr.Gando
    I'm developing a game, a big part of this game, is about scrolling a "circular" background ( the right end of the Background Image can connect with the left start of the Background image ). Should be something like this: ( Entity moving and arrow to show where the background should start to repeat ) This happens in order to allow to have an Entity walking, and the background repeating itself over and over again. I'm not working with tile-maps, the background is a simple Texture (400x300 px). Could anyone point me to a link , or tell me the best way I could accomplish this ? Thanks a lot.

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  • ruby memory leak Gdk::PixbufLoader

    - by Reed Debaets
    So I'm beginning to wonder how leaky the gnome2 libraries for ruby1.8.6 are. #!/usr/bin/env ruby require 'gtk2' while true sleep 0.1 pixbuf = Gdk::PixbufLoader.new pixbuf = nil end this leaks about 16kb/sec according to watch -n 1 ps -o rss -p <process id> This is compounded if you start trying to write a chunk of large chunks of image data to it using pixbuf.last_write img_data Any ideas how to get around this (and the second issue)? I need to update image data within my code but it seems like anything that ends up using a pixbuf leaks like a sieve.

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  • How do I use texture-mapping in a simple ray tracer?

    - by fastrack20
    I am attempting to add features to a ray tracer in C++. Namely, I am trying to add texture mapping to the spheres. For simplicity, I am using an array to store the texture data. I obtained the texture data by using a hex editor and copying the correct byte values into an array in my code. This was just for my testing purposes. When the values of this array correspond to an image that is simply red, it appears to work close to what is expected except there is no shading. The bottom right of the image shows what a correct sphere should look like. This sphere's colour using one set colour, not a texture map. Another problem is that when the texture map is of something other than just one colour pixels, it turns white. My test image is a picture of water, and when it maps, it shows only one ring of bluish pixels surrounding the white colour. When this is done, it simply appears as this: Here are a few code snippets: Color getColor(const Object *object,const Ray *ray, float *t) { if (object->materialType == TEXTDIF || object->materialType == TEXTMATTE) { float distance = *t; Point pnt = ray->origin + ray->direction * distance; Point oc = object->center; Vector ve = Point(oc.x,oc.y,oc.z+1) - oc; Normalize(&ve); Vector vn = Point(oc.x,oc.y+1,oc.z) - oc; Normalize(&vn); Vector vp = pnt - oc; Normalize(&vp); double phi = acos(-vn.dot(vp)); float v = phi / M_PI; float u; float num1 = (float)acos(vp.dot(ve)); float num = (num1 /(float) sin(phi)); float theta = num /(float) (2 * M_PI); if (theta < 0 || theta == NAN) {theta = 0;} if (vn.cross(ve).dot(vp) > 0) { u = theta; } else { u = 1 - theta; } int x = (u * IMAGE_WIDTH) -1; int y = (v * IMAGE_WIDTH) -1; int p = (y * IMAGE_WIDTH + x)*3; return Color(TEXT_DATA[p+2],TEXT_DATA[p+1],TEXT_DATA[p]); } else { return object->color; } }; I call the colour code here in Trace: if (object->materialType == MATTE) return getColor(object, ray, &t); Ray shadowRay; int isInShadow = 0; shadowRay.origin.x = pHit.x + nHit.x * bias; shadowRay.origin.y = pHit.y + nHit.y * bias; shadowRay.origin.z = pHit.z + nHit.z * bias; shadowRay.direction = light->object->center - pHit; float len = shadowRay.direction.length(); Normalize(&shadowRay.direction); float LdotN = shadowRay.direction.dot(nHit); if (LdotN < 0) return 0; Color lightColor = light->object->color; for (int k = 0; k < numObjects; k++) { if (Intersect(objects[k], &shadowRay, &t) && !objects[k]->isLight) { if (objects[k]->materialType == GLASS) lightColor *= getColor(objects[k], &shadowRay, &t); // attenuate light color by glass color else isInShadow = 1; break; } } lightColor *= 1.f/(len*len); return (isInShadow) ? 0 : getColor(object, &shadowRay, &t) * lightColor * LdotN; } I left out the rest of the code as to not bog down the post, but it can be seen here. Any help is greatly appreciated. The only portion not included in the code, is where I define the texture data, which as I said, is simply taken straight from a bitmap file of the above image. Thanks.

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  • Managing Static Library project as a module like Framework on iOS project in Xcode4.

    - by Eonil
    (Solution Note, I'll answer immediately) Many people including me trying to make a kind of Static Library framework for iOS to archive some kind of modularity. Framework is best way to do this, but it doesn't provided by Apple, and workarounds don't work well. https://github.com/kstenerud/iOS-Universal-Framework/tree/master/Fake%20Framework/Templates Fake framework cannot be referenced from linking tab in Build Phases. Real framework needs modification of system setting. And still not work smoothly on every parts. Problem is static library need header files, and it's impossible to reference header files on project at another location on different project without some script. And script breaks IDE's file management abstraction. How can I use static library project like a convenient module manner? (just dragging project into another project to complete embedding)

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  • UINavigationController (drawRect:)

    - by ludo
    Hi, I created an application with a TabBarController, 4 TabBarItems and every TabBarItem have is own NavigationController file (everything created in IB). I'm using the drawRect function to design my navigationBar: @implementation UINavigationBar (customImage) -(void)drawRect:(CGRect)rect { UIImage *image = [UIImage imageNamed:@"MyImage.png"]; [image drawInRect:CGRectMake(0,0, self.frame.size.width,self.frame.size.height)]; } @end The problem is that the NavigationBar change for every ViewController inside my app, what I want is only draw the NavigationBar for one TabBarItem only and use the default navigationBar for other controller. How to do that? Thanks,

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  • Grub loading unknown file system grub rescue

    - by Ashish Kumar
    I am new to Linux. I had Windows 7 installed in my laptop. Yesterday I installed Ubuntu 9.0 from a free CD I got. I choose the option "Install side by side with Windows 7 loader (something like that..)". Everything went fine & I installed Ubuntu. When I restarted, I could easily boot from both Windows 7 & Ubuntu. But later when I booted from Windows 7, I did a disk management by right clicking "my Computer" & choosing the option "Manage". Actually I deleted a drive & added that empty volume in another drive. Now when I start my system it shows the following error: Grub loading Unknown file system grub rescue> I have no clue what to do now. Please help me at urgent. Any solution in layman's language is greatly appreciated. P.S. I want all my files on both Windows 7 & Ubuntu.

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  • How to build mach-0 for different architectures?

    - by Victor Lin
    I have some dylibs to load from python with ctypes. I can load libbass.dylib without problem, but I can't load the self-compiled libmp3lame.dylib. Here is the error I get. OSError: dlopen(libmp3lame.dylib, 6): no suitable image found. Did find: libmp3lame.dylib: mach-o, but wrong architecture Then, I inspect the file type of those libs. Here is the result of libbass.dylib: libbass.dylib: Mach-O universal binary with 2 architectures libbass.dylib (for architecture i386): Mach-O dynamically linked shared library i386 libbass.dylib (for architecture ppc): Mach-O dynamically linked shared library ppc And here is the self-compiled one: libmp3lame.dylib: Mach-O 64-bit dynamically linked shared library x86_64 I did compile the lame library with the install instructions: ./configure make make install I'm new to mac system, here comes the problem: how to build the libmp3lame.dylib so that it supports different architecture I want? Thanks.

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  • How to rectify InvalidActiveXStateException in WPF?

    - by Gagan
    I am trying to make a WPF Application and using the Visio Controls. I have a dll named AxInterop.Microsoft.Office.Interop.VisOcx and I refer it to instantiate an object of the type AxDrawingControl(). Now as soon as I write this code: AxDrawingControl objDrawControl=new AxDrawingControl(); and check the attributes of this object objDrawControl in the debug mode, I see this message: Exception of type 'System.Windows.Forms.AxHost+InvalidActiveXStateException' was thrown. Here is how it looks like: Please help me to get this thing resolved! Please! I just realized the image isn't visible. So here is the link of the image showing the error message: http://www.freeimagehosting.net/uploads/fed103f4d3.jpg

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  • A generic error occurred in GDI+.

    - by Pinu
    A generic error occurred in GDI+ [ExternalException (0x80004005): A generic error occurred in GDI+.] System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder, EncoderParameters encoderParams) +615257 I have a webpage in which a pdf is converted to png, and using the response.outputstream it is displayed. when i run this on my local machine is works fine. but when i run the same code on server is throws this exception. my question is , where i could look in for error. as there is no inner exception or any other information provided. only clue is that it's happening on Image.Save , but the same code works perfectly fine on my local machine , then y is it not working on production???

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  • Unreachable code detected by using const variables

    - by Anton Roth
    I have following code: private const FlyCapture2Managed.PixelFormat f7PF = FlyCapture2Managed.PixelFormat.PixelFormatMono16; public PGRCamera(ExamForm input, bool red, int flags, int drawWidth, int drawHeight) { if (f7PF == FlyCapture2Managed.PixelFormat.PixelFormatMono8) { bpp = 8; // unreachable warning } else if (f7PF == FlyCapture2Managed.PixelFormat.PixelFormatMono16){ bpp = 16; } else { MessageBox.Show("Camera misconfigured"); // unreachable warning } } I understand that this code is unreachable, but I don't want that message to appear, since it's a configuration on compilation which just needs a change in the constant to test different settings, and the bits per pixel (bpp) change depending on the pixel format. Is there a good way to have just one variable being constant, deriving the other from it, but not resulting in an unreachable code warning? Note that I need both values, on start of the camera it needs to be configured to the proper Pixel Format, and my image understanding code needs to know how many bits the image is in. So, is there a good workaround, or do I just live with this warning?

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  • Ubuntu 13.10 installer making no changes to partition, even after complete

    - by dragonhart6505
    Trying to install Ubuntu 13.10 (x64 package) on a HP Probook 4430S from USB made with UnetBootin. Intel Celeron B810 Dual-core x64 1.6ghz 4gb Ram Intel Graphics HD 2000 320GB HDD - 3 partitions (1 with backup files - 40gb, 2 Win7 that were dual-boot but no longer boot after attempting to install - 55gb and 222gb) I am fine with losing the data on the 222gb partition, but when trying to install it only shows the 55gb and the 222gb, but the 222gb is not 222gb...its including the 40gb backup. Whatever, went through with the installation anyway. Files can be replaced (just backed-up games anyway.) Installation appears to run without a hitch on the now 222gb/262gb partition, formatted to ext4 with the installer itself. Asks to reboot to begin using. Upon rebooting, I get the GNU boot selection screen. Press Enter on "Ubuntu". Get a "Gave up booting from root..." or something error. Reboot and load "Try without installing" option from USB. Once booted, nothing has changed! All 3 partitions are still present, all files intact. But now I can't boot my Win7 55gb partition. EVERYTHING in the "Try..." loader works perfectly. Bluetooth, Wifi, Display adapter, SD Card reader, HDMI-Out, DVD drive, USB ports...even reads correct battery data. Help?

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  • jQuery: Sort div's according to content of different sub divs

    - by rayne
    I'm trying to create a somewhat complex sorting feature which neither uses divs nor lists. Unfortunately two hours of googling didn't help me. Here is the basic setup of my HTML: <div id="all_elements"> <!-- one element --> <div class="element"> <div class="wrapper"> <a href="/" title="links"> <img src="/img/image.jpg" border="0" alt="image" class="image" /></a> <div class="details"> <h3><a href="/" title="title">Name (Sort Argument 1)</a></h3> <div class="title"><a href="/" title="title">Title (Sort Argument 2)</a></div> <div class="year">2010 (Sort Argumentt 3)</div> <div class="country">Great Britain (Sort Argument 4)</div> </div><!-- details --> </div><!-- wrapper --> </div><!-- element --> </div> <!--all_elements--> The setup is a bit complex, but basically .element is the element that needs to be sorted alphabetically according to either the contents of h3, div.title, div.year or div.country. So the user will be able to view the contents of the site either sorted by name, by year, by country or by title. I have this jQuery snippet from a website, but all my attempts on trying to tell it to use the contents of e.g. h3 to sort have failed. Right now it sorts pretty much randomly. jQuery.fn.sort = function() { return this.pushStack([].sort.apply(this, arguments), []); }; function sortAscending(a, b) { return a.innerHTML > b.innerHTML ? 1 : -1; }; function sortDescending(a, b) { return a.innerHTML < b.innerHTML ? 1 : -1; }; $(document).ready(function() { $("#sort").toggle( function() { $('#all_elements .element').sort(sortDescending).appendTo('#all_elements'); $(this).text("Sort Asc"); }, function() { $('#all_elements .element').sort(sortAscending).appendTo('#all_elements'); $(this).text("Sort Desc"); }); }); How can I customize the function to sort the contents of my h3 or divs?

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  • How to build march-0 for different architectures?

    - by Victor Lin
    I have some dylibs to load from python with ctypes. I can load libbass.dylib without problem, but I can't load the self-compiled libmp3lame.dylib. Here is the error I get. OSError: dlopen(libmp3lame.dylib, 6): no suitable image found. Did find: libmp3lame.dylib: mach-o, but wrong architecture Then, I inspect the file type of those libs. Here is the result of libbass.dylib: libbass.dylib: Mach-O universal binary with 2 architectures libbass.dylib (for architecture i386): Mach-O dynamically linked shared library i386 libbass.dylib (for architecture ppc): Mach-O dynamically linked shared library ppc And here is the self-compiled one: libmp3lame.dylib: Mach-O 64-bit dynamically linked shared library x86_64 I did compile the lame library with the install instructions: ./configure make make install I'm new to mac system, here comes the problem: how to build the libmp3lame.dylib so that it supports different architecture I want? Thanks.

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  • Extended with advice: Moving block wont work in Javascript

    - by Mack
    Hello Note: this is an extension of a question I just asked, i have made the edits & taken the advice but still no luck I am trying to make a webpage where when you click a link, the link moves diagonally every 100 milliseconds. So I have my Javascript, but right now when I click the link nothing happens. I have run my code through JSLint (therefore changed comaprisions to === not ==, thats weird in JS?). I get this error from JSLink though: Error: Implied global: self 15,38, document 31 What do you think I am doing wrong? <script LANGUAGE="JavaScript" type = "text/javascript"> <!-- var block = null; var clockStep = null; var index = 0; var maxIndex = 6; var x = 0; var y = 0; var timerInterval = 100; // milliseconds var xPos = null; var yPos = null; function moveBlock() { if ( index < 0 || index >= maxIndex || block === null || clockStep === null ) { self.clearInterval( clockStep ); return; } block.style.left = xPos[index] + "px"; block.style.top = yPos[index] + "px"; index++; } function onBlockClick( blockID ) { if ( clockStep !== null ) { return; } block = document.getElementById( blockID ); index = 0; x = number(block.style.left); // parseInt( block.style.left, 10 ); y = number(block.style.top); // parseInt( block.style.top, 10 ); xPos = new Array( x+10, x+20, x+30, x+40, x+50, x+60 ); yPos = new Array( y-10, y-20, y-30, y-40, y-50, y-60 ); clockStep = self.SetInterval( moveBlock(), timerInterval ); } --> </script> <style type="text/css" media="all"> <!-- @import url("styles.css"); #blockMenu { z-index: 0; width: 650px; height: 600px; background-color: blue; padding: 0; } #block1 { z-index: 30; position: relative; top: 10px; left: 10px; background-color: red; width: 200px; height: 200px; margin: 0; padding: 0; /* background-image: url("images/block1.png"); */ } #block2 { z-index: 30; position: relative; top: 50px; left: 220px; background-color: red; width: 200px; height: 200px; margin: 0; padding: 0; /* background-image: url("images/block1.png"); */ } #block3 { z-index: 30; position: relative; top: 50px; left: 440px; background-color: red; width: 200px; height: 200px; margin: 0; padding: 0; /* background-image: url("images/block1.png"); */ } #block4 { z-index: 30; position: relative; top: 0px; left: 600px; background-color: red; width: 200px; height: 200px; margin: 0; padding: 0; /* background-image: url("images/block1.png"); */ } #block1 a { display: block; width: 100%; height: 100%; } #block2 a { display: block; width: 100%; height: 100%; } #block3 a { display: block; width: 100%; height: 100%; } #block4 a { display: block; width: 100%; height: 100%; } #block1 a:hover { background-color: green; } #block2 a:hover { background-color: green; } #block3 a:hover { background-color: green; } #block4 a:hover { background-color: green; } #block1 a:active { background-color: yellow; } #block2 a:active { background-color: yellow; } #block3 a:active { background-color: yellow; } #block4 a:active { background-color: yellow; } --> </style>

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  • Passing big multi-dimensional array to function in C

    - by kirbuchi
    Hi, I'm having trouble passing a big array to a function in C. I declare: int image[height][width][3]={}; where height and width can be as big as 1500. And when I call: foo((void *)image,height,width); which is declared as follows: int *foo(const int *inputImage, int h, int w); I get segmentation fault error. What's strange is that if my values are: height=1200; width=290; theres no problem, but when they're: height=1200; width=291; i get the mentioned error. At 4 bytes per integer with both height and width of 1500 (absolute worst case) the array size would be of 27MB which imo isn't that big and shouldn't really matter because I'm only passing a pointer to the first element of the array. Any advice?

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  • How can you extend the Bitmap class

    - by vrish88
    Hello, I am trying to extend the Bitmap class so that I can apply my own effects to an image. When I use this code: namespace ImageEditor { public class Effects : System.Drawing.Bitmap { public void toBlackAndWhite() { System.Drawing.Bitmap image = (Bitmap)this; AForge.Imaging.Filters.Grayscale filter = new AForge.Imaging.Filters.Grayscale(); this = filter.Apply(this); } } } I get the following error: 'ImageEditor.Effects': cannot derive from sealed type 'System.Drawing.Bitmap' So is there a way to get around this or is it simply not possible to extend the class? Thanks.

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  • try...else...except syntax error

    - by iform
    I can't understand this... Cannot get this code to run and I've no idea why it is a syntax error. try: newT.read() #existingArtist = newT['Exif.Image.Artist'].value #existingKeywords = newT['Xmp.dc.subject'].value except KeyError: print "KeyError" else: #Program will NOT remove existing values newT.read() if existingArtist != "" : newT['Exif.Image.Artist'] = artistString print existingKeywords keywords = os.path.normpath(relativePath).split(os.sep) print keywords newT['Xmp.dc.subject'] = existingKeywords + keywords newT.write() except: print "Cannot write tags to ",filePath Syntax error occurs on the last "except:". Again...I have no idea why python is throwing a syntax error (spent ~3hrs on this problem).

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  • Removing views from UIScrollView

    - by mohan
    I have two UIScrollViews that I move images between. The user can drag and forth between the scroll views. I am trying to animate the movement of the image from one scroll view to another. In -touchesMoved (handled in my UIViewController which has two custom UIScrollViews that intercept touch and sends to my UIViewController), I am trying to set the "center" of my UIImageView that is being moved. As it is moved, the image gets hidden behind the UIScrollView and not visible. How do I make it appear on top of the UIScrollView? I am able to handle the -touchesEnded properly by animating in the destination scroll view. I am also confused about -convertPoint:fromView: usage in the iPhone Programming Guide (See Chapter 3, Event Handling). If the touch coordinates are in window coordinates, to change my view (UIImageView inside a UIScrollView which is inside a UIView and inside a window) center don't I have to use -convertPoint:toView:, i.e., imageView.center = [self.view.window convertPoint:currentTouchPosition toView:imageView]; What am I missing?

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  • Grub menu will not show the first time I try to boot my ubuntu server 12.04 after it is shutdown for a long time

    - by user211477
    I am running into a booting issue after installing Ubuntu Server 12.04 LTS. Following is the symptom of the problem. SYSTEM DESCRIPTION: Dual core AMD Athlon 64 3 Disks: two SATA (out of which one is SSD) and one PATA. Using LVM for disk partition management. /boot is not under LVM rest of the partitions are. / is on the SSD BIOS boot sequence is correct and points to the disk with /boot and boot loader is installed on this disk. SYMPTOMS: POST messages Blinking cursor on first line then moves to second line Screen flickers then becomes black Everything is unresponsive, hard reboot POST messages will not show up on screen. Monitor displays powersave message Force shutdown machine again. Shutoff power to machine for a few minutes. Restart machine. POST message show up. Grub menu shows up Ubuntu server 12.04 boots normally. From now on Ubuntu server boots normally until machine is shutdown for a long time (for example, 30 mins) Repeat steps 1 through 13 once the machine is started after a long time. WHAT DID I TRY? I read several posts and have tried: radeon.modeset=0 setting the gfxmode edd=0 nolacpi boot-repair Nothing seems to work. In my search I did see only one post with this same symptom. Unfortunately, I am not being able to locate that post anymore. The interesting fact is that with this same machine configuration, if I install Ubuntu Desktop 12.04 then everything works fine. Any help will be appreciated.

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  • Add UIView behind UITableView in UITableViewController code

    - by Drew C
    I would like to use a fixed image as the background in a simple grouped table view in my iPhone program. Unfortunately, no matter what I do, the background is always solid white. I have followed several supposed solutions on this site and others to no avail. Here is the relavant code in the viewDidLoad method of the table view controller class (note, this code uses a solid blue color rather than an image for simplicity's sake): self.tableView.opaque = NO; self.tableView.backgroundColor = [UIColor clearColor]; UIView *backgroundView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)]; backgroundView.backgroundColor = [UIColor blueColor]; [self.tableView.window addSubview:backgroundView]; [backgroundView release]; I suspect that I am not positioning the backgroundView view in the right place. I have tried sendToBack:, bringToFront:, and others but I always just get a white background. Is it possible to do this from within the UITableViewController? Must I use Interface Builder?

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  • Dynamicly Inject img alt attribute jQuery

    - by Brock
    I need some help, and before we get going, I know it is probably not best practice, but I am doing some maintenance to an existing site and need to accomplish the following for a fix. <a rel="lightbox" href="site.com" title="a generated title"><img src="site.com/img" class="post-image" alt="a long description"/></a> Okay, so I am trying to figure out how to use jQuery or any other method to take the "alt" attribute from my image, and dynamically overwrite the "title" attribute of my "a" tag. Any help would be awesome, I am kinda lost at this juncture.

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  • Variable alpha blending in pylab

    - by Hooked
    How does one control the transparency over a 2D image in pylab? I'd like to give two sets of values (X,Y,Z,T) where X,Y are arrays of positions, Z is the color value, and T is the transparency to a function like imshow but it seems that the function only takes alpha as a scalar. As a concrete example, consider the code below that attempts to display two Gaussians. The closer the value is to zero, the more transparent I'd like the plot to be. from pylab import * side = linspace(-1,1,100) X,Y = meshgrid(side,side) extent = (-1,1,-1,1) Z1 = exp(-((X+.5)**2+Y**2)) Z2 = exp(-((X-.5)**2+(Y+.2)**2)) imshow(Z1, cmap=cm.hsv, alpha=.6, extent=extent) imshow(Z2, cmap=cm.hsv, alpha=.6, extent=extent) show() Note: I am not looking for a plot of Z1+Z2 (that would be trivial) but for a general way to specify the alpha blending across an image.

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  • How can I write a scrolling text in cocos2d ?

    - by srikanth rongali
    I have a text and it should be abled to scrolled only up and down to see entire text. and my application is a game and written in cocos2d. So, I have layers. There is also an image(CCSprite) adjacent to text. The text should be scrolled and the image have a touchesEnded: property. I used CCLabel for text and CCParallaxNode to add the text. But the text appears like a continues paragraph. But, my text should have different lines. My text is like this. //text starts Hey Player. Do you want to play the game right now then play. Do you want to practice or Play? what want to do? ...text continues //text ends What should I use for this ? Thank you.

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