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• Address calling class [Java]

  - by Samuel

  Hello! [I am rather new to Java and Object Oriented programming] I have an abstract class Moveable with the method abstract void move() which is extended by the class Bullet and the abstract class Character, and Character is extended by the class Survivor and the class Zombie. In Survivor and Bullet the move() method doesnt require any parameters while in the class Zombie the move() method depends on the actual position of the survivor. The survivor and multiple zombies are created in the class Gui. I wanted to access the survivor in Zombie - what's the best way of doing this? In Gui i wrote a method getSurvivor() but i don't see how to access this method in Zombie? I am aware that as a workaround i could just pass a [Survivor survivor] as parameter in move() and ignore it in Bullet and Survivor, but that feels so ... bad practice. Thank you for your time! Samuel [I am not sure what tags to set here, please correct me if i'm wrong]

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• ASP.NET AJAX UpdatePanel problem

  - by Velika

  I'll try and be concise: 1) I have a dropdownlist with Autopostback set to TRUE 2) I have an UpdatePanel that contains a Label. 3) When the downdownlist selection is changed, I want to update the label. Problem: Focus is lost on the dropdownlist, forcing the user to click on the dropdownlist to reset focus back to the control. My "solution": In the DropDownList_SelectionChanged event, set focus back to the drop down list: dropdownlist1.focus() Problem: While this works great in IE, Firefox and Chrome change the scroll position such that the control which was assigned focus is positioned at the bottom on the visible portion of the browser window. This is often a very disorientating side effect. How can this be avoided so it works in FF as it does in IE?

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• Google Visualization legend format Jquery ui tabs

  - by Liam

  I've got an issue when using the Google Visualization api line chart with Jquery ui tabs. I've got two graphs on two tabs. The first graph, which is visible by default displays fine: the second chart on the hidden tab seems to be messing up the key: I've tried changing the options but nothing I do seems to make any difference. Here are my options: options = { 'title': title, titleTextStyle: { color: color, fontSize: 20 }, 'width': 950, 'height': 400, hAxis: { minorGridlines: { count: x } }, chartArea: { width: 880 }, legend: { position: 'bottom', textStyle: { fontSize: 10 } } }; // Instantiate and draw our chart, passing in some options. var chart = new google.visualization.LineChart(document.getElementById(divId)); chart.draw(data, options); $('#tabs').tabs(); any thoughts on what is causing this and how to prevent it?? Edit If I remove the tabs() call it displays correctly. As per answer below from @Vipul tried setting the div to a fixed width, no difference.

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• How can I stop my "headerSticky" and "content" divs from overlapping?

  - by danielle

  I'm making a page that has three main components: a "headerSticky" header div, "sidenav" left navigation div, and "content" div. The side navigation is fixed and does not move; but the content div should be scrollable on its own. However, the top of the content div is always overlapped by the header div. Here is the CSS for the header: #headerSticky{ float:top; position:fixed; padding:6px; width: 100%;} and the content div: #content { padding-top: 100px; float:right; overflow: auto; height: 90%; width: 840px; padding: 0 20px 20px;} Any help would be appreciated. Thank you!

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• iPhone UIScrollView / setContentOffset weirdness

  - by bibac

  Hi, I have a weird issue with setContentOffset which I don't seem to be able to solve: I'm trying to build an "endless" scroll view, so I'd like to reset the content offset at a certain position. With the code below setContentOffset will be called at x=160px. If I drag the scroll view my log looks like this: offset: 158 offset: 159 offset: 160 offset: 80 offset: 160 What happens is that my setContentOffset (to 80) is performed, when I keep on dragging UIScrollView seem to have forgotten about it and continues at 160. Even weirder: When I set animated:YES it works. Maybe a timing issue? When I call setContentOffset from within scrollViewDidScroll, scrollViewDidScroll will be called again. - (void)scrollViewDidScroll:(UIScrollView *)scrollView { NSInteger tileNo = floor(scrollView.contentOffset.x / 80); NSLog(@"offset: %f, tile: %d, lastTile: %d", scrollView.contentOffset.x, tileNo, lastTileNo); if (tileNo > lastTileNo) { [scrollView setContentOffset:CGPointMake(80, 0) animated:NO]; } lastTileNo = tileNo; } Thanks for helping me out, Stephan

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• iPhone sdk, at dismissModalViewcontrollerAnimated, the parent change y origin coordinate

  - by DigitalVanilla

  Hi guys, my first post here :) I'm having a small trouble with a small but boring problem. I have a view, with a NavigationController. I load in the NC a simple view. Inside this view there's abutton where I fire the presentModalView... in the main view, not on NC, but it's parent view: ABVIEW NC NEWVIEW new attach a presentModalView... on ABVIEW, so [abview present...]; No problem till now. When it's the time to dismiss, after the temporary window (let's calls it NOTES) disappear, my ABVIEW with all the subviews change Y position from 0 to 20, the same height of the status bar. I was looking everywhere and I'm sure it's a stupid thing, but I miss a bit of knowledge here and I have no idea where to find the solution. thanks in advance!

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• How to reinforce pseudo css rules

  - by danwoods

  Is there anyway to reinforce pseudo css rules? ie: I have a listing of divs (playlist) which I color with the following rules: #playlist .playlist_item { background: #d6d6d6; } #playlist .playlist_item:nth-child(odd) { background: #b3b3b3; } Now, when a song is playing, I use setInterval and JQuery's .animate function to pulse the background color. When the song is finished I clear the interval, but of course the song's background remains the last color set in the interval. Is there a way to re-set the song's color based on the CSS rule? Otherwise I'll have to keep track of the previous song (which may have changed position, and thus color) or setup distinct background color classes and reset the classes of all the songs in the playlist anytime someone adds, removes, or moves a song in the playlist or a song ends. I'd much rather use a CSS only approach. Thanks in advance, Dan

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• How to draw a full ellipse in a StreamGeometry in WPF?

  - by romkyns

  The only method in a StreamGeometryContext that seems related to ellipses is the ArcTo method. Unfortunately it is heavily geared to joining lines rather than drawing ellipses. In particular, the position of the arc is determined by a starting and ending point. For a full ellipse the two coincide obviously, and the exact orientation becomes undefined. So far the best way of drawing an ellipse centered on 100,100 of size 10,10 that I found is like this: using (var ctx = geometry.Open()) { ctx.BeginFigure(new Point(100+5, 100), isFilled: true, isClosed: true); ctx.ArcTo( new Point(100 + 5*Math.Cos(0.01), 100 + 5*Math.Sin(0.01)), // need a small angle but large enough that the ellipse is positioned accurately new Size(10/2, 10/2), // docs say it should be 10,10 but in practice it appears that this should be half the desired width/height... 0, true, SweepDirection.Counterclockwise, true, true); } Which is pretty ugly, and also leaves a small "flat" area (although not visible at normal zoom levels). How else might I draw a full ellipse using StreamGeometryContext?

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• Developing a GPS car tracking system

  - by Click Ok

  I'm in the brainstorming phase to develop a GPS car tracking system requested by a customer. I myself know the directions to build some GPS system to mobile phones and etc. But sincerely I don't know how to start in that project. That is the scenario: 1) The cars will get a device with a SIM CARD that will emit GPS signals. 2) My customer will in any place (home, work, etc) with a web connection will see in the map where the car is located. For me, I have not problems at get the GPS data, convert to usable info and show the position in some map system (like Google Maps or MS Bing Maps, by example). My problem is, how I do to retrieve that "GPS Signal" from device in the car? I will need some kind of "Receiver Device" connected to a web server machine in order to my application to consume that data? Or "automagically" my sodtware will receive the info from a third-party web-service? Or what?

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• Which offer to pick?

  - by Shawn

  OK. This is kinda silly, but I'd really like to hear what you guys say. Here is the thing: I used to be an php developer and started looking for jobs 3 weeks ago and now I got 2 offers at hand. If I took the first one what I do would be 100% in PHP - simply dev works on a ecommerce project. If I go with the second one, the projects would be in python which I didn't have too much experiences on and is kinda exited about the new stuff I'm going to learn. But wait, the first offer gives more money(1k plus) and that's why I'm still hesitating and troubling you guys.) If you were me, which one would you pick? I know there could be other factors to be considered like 'which position is closer to your home so you could take good care of your dog', well let's forget about those things for now.

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• Compiler optimization of references

  - by Phineas

  I often use references to simplify the appearance of code: vec3f& vertex = _vertices[index]; // Calculate the vertex position vertex[0] = startx + col * colWidth; vertex[1] = starty + row * rowWidth; vertex[2] = 0.0f; Will compilers recognize and optimize this so it is essentially the following? _vertices[index][0] = startx + col * colWidth; _vertices[index][1] = starty + row * rowWidth; _vertices[index][2] = 0.0f;

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• How do I know if have RSI or carpal tunnel?

  - by saniul

  I feel that this is a much better place to ask this than a medical forum, we have ~250 people who spent most of their day in front of a computer. Does anyone here have any experience with such injuries? How/when did you find out? What did you do (if anything)? I don't know if I have the RSI, but I can tell you that I can "crack" my wrist and almost any one of my fingers whenever I want. Also, my wrist sometimes hurts me when I type for a very long time (especially on a laptop keyboard I have very long fingers so the palm is in an uncomfortable position most of the time) Is this normal? I bought a Logitech Wave keyboard, obviously it feels much better than the laptop keyboard, but I can't really tell if it helps the "cracking" and my wrist still sometimes hurts.

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• PyOpenGL: glVertexPointer() offset problem

  - by SurvivalMachine

  My vertices are interleaved in a numpy array (dtype = float32) like this: ... tu, tv, nx, ny, nz, vx, vy, vz, ... When rendering, I'm calling gl*Pointer() like this (I have enabled the arrays before): stride = (2 + 3 + 3) * 4 glTexCoordPointer( 2, GL_FLOAT, stride, self.vertArray ) glNormalPointer( GL_FLOAT, stride, self.vertArray + 2 ) glVertexPointer( 3, GL_FLOAT, stride, self.vertArray + 5 ) glDrawElements( GL_TRIANGLES, len( self.indices ), GL_UNSIGNED_SHORT, self.indices ) The result is that nothing renders. However, if I organize my array so that the vertex position is the first element ( ... vx, vy, vz, tu, tv, nx, ny, nz, ... ) I get correct positions for vertices while rendering but texture coords and normals aren't rendered correctly. This leads me to believe that I'm not setting the pointer offset right. How should I set it? I'm using almost the exact same code in my other app in C++ and it works.

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• How do I wait for "animated scroll to id" to complete before focusing on first form field?

  - by codemonkey613

  So, I have a link at the bottom of website. When it is clicked, it scrolls to a form at the top of the page with the animated style. And as it arrives at top of page, it focuses on the first field in form. Currently, this is my code: $(document).ready(function() { $('#goto-show-form').click(function() { $('html, body').animate({scrollTop: $("#show-form").offset().top}, '500'); $('#first-field').focus(); return false; }); }); What happens is it begins scrolling, then focuses to form field while still in process of scrolling, then returns to last position in scrolling process and continues scrolling up. Instead of being smooth, you can see it cuts back and forth. How can I tell jquery to wait until scrolling is complete before focusing to the form field? Here is the website: http://bit.ly/dfjvmT (The link that starts scroll is "Send us your resume" at the bottom.) Thanks.

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• SoundChannel object plays small portion after being stopped and played again

  - by gok

  SoundChannel object is stopped and played again. When played again it plays small portion from the previous position and suddenly jumps back to the beginning. It doesn't play the whole sound before looping. This happens only once, then it loops normally. It happens again if I stop and play. public function play():void { channel = clip.play(trimIn); volume(currentVolume); isPlaying = true; timer.start(); channel.addEventListener(Event.SOUND_COMPLETE, loopMusic); } public function loopMusic(e:Event=null):void { if (channel != null) { timer.stop(); channel.removeEventListener(Event.SOUND_COMPLETE, loopMusic); play(); } } Do I need to somehow reset the soundChannel?

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• iPhone: Howto get notified when an UIView becomes visible

  - by arne_

  Is there a way to get a notification, a callback or some other means to call a method whenever a UIView becomes visible for the user, i.e. when a UIScrollview is the superview of some UIViews, and the ViewController of such a UIView shall get notified when its view is now visible to the user? I am aware of the possible, but not so elegant solution of checking to which position the ScrollView scrolled (via UIScrollViewDelegate-methods) and compute if either one of the subviews is visible... But I'm looking for a more universal way of doing this.

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• Printing an NSDocument

  - by Brian Postow

  I'm trying to print a document. The document is an array of NSImageReps, or a single NSPDFImageRep, which has multiple pages. I'm having trouble figuring out how to use the NSPrintOperation class to print this. The NSPrintOperation seems to need an NSView to print. Do I need to manually add each image into the view at a calculated position and then let it do the pagination? that seems like it isn't in the spirit of Cocoa... is there some technique that I'm missing?

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• wheel of fortune collision detection

  - by Andrew

  Hey, I have a wheel segmented into 8 pie pieces, and a picker that is pointing at the currently selected segment (think wheel of fortune). I want to highlight the currently selected segment, and so have started to use Chipmunk to construct the 8 segments, attached to a rotating body, and then the picker that is put in a position to collide with each of the segments. The trick is, how do you allow the picker to pass over top of the segments, while still getting the collision, but not actually colliding and slowing down the wheel? I haven't started down this path yet, but thought this may solve the problem: removing the colliding segment and then putting it back after the picker has started colliding with another segment a bit away (like two segments away). There may be a much simpler solution not even involving Chipmunk that I haven't thought of. Thanks, Andrew

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• Android RadioButton like Behaviour

  - by monxalo

  Greetings, I'm trying to create a single-choice android control, in a horizontal layout, by making use of the RadioGroup behaviour. I can assign the drawable just fine, but i would like to position the label of each RadioButton inside the drawable, is this possible using the standard APIs? <RadioGroup android:id="@+id/switchcontainer" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal" android:checkedButton="@+id/RadioButton02" android:padding="3dip"> <RadioButton android:text="id RadioButton02" android:id="@+id/RadioButton02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:button="@drawable/radio_button" android:paddingRight="2dip" /> <RadioButton android:text="@+id/RadioButton03" android:id="@+id/RadioButton03" android:layout_width="wrap_content" android:layout_height="wrap_content" android:button="@drawable/radio_button" android:paddingRight="2dip" />> </RadioGroup>

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• Dice face value recognition

  - by Jakob Gade

  I’m trying to build a simple application that will recognize the values of two 6-sided dice. I’m looking for some general pointers, or maybe even an open source project. The two dice will be black and white, with white and black pips respectively. Their distance to the camera will always be the same, but their position on the playing surface will be random. (not the best example, the surface will be a different color and the shadows will be gone) I have no prior experience with developing this kind of recognition software, but I would assume the trick is to first isolate the faces by searching for the square profile with a dominating white or black color (the rest of the image, i.e. the table/playing surface, will in distinctly different colors), and then isolate the pips for the count. Shadows will be eliminated by top down lighting. I’m hoping the described scenario is so simple (read: common) it may even be used as an “introductory exercise” for developers working on OCR technologies or similar computer vision challenges.

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• Python turtle module confusion

  - by John

  Hi, I'm trying to to add more lines to the triangle, so instead of 3 leading off there will be 5 depending on the parameter given but I really have no idea what to do at this stage and any help would be very welcome. Thanks in advance!:) def draw_sierpinski_triangle(tracer_on, colour, initial_modulus, line_width, initial_heading,initial_x, initial_y, steps): turtle=Turtle() turtle.name = 'Mother of all turtles' turtle.reset () turtle.tracer (tracer_on) turtle.speed ('fastest') turtle.color (colour) turtle.width (line_width) turtle.up() turtle.goto (initial_x, initial_y) turtle.down() turtle.set_heading (initial_heading) draw_sub_pattern (tracer_on, turtle, initial_modulus, 0, steps) def draw_sub_pattern (tracer_on, turtle, modulus, depth, steps): if (depth >= steps): return; x, y = turtle.position () heading = turtle.heading () # draw the pattern turtle.up() turtle.down() turtle.forward (modulus) draw_sub_pattern(tracer_on, turtle, modulus * 0.5, depth + 1, steps) turtle.up() turtle.goto(x, y) turtle.down() turtle.set_heading (heading + 120) turtle.forward (modulus) draw_sub_pattern(tracer_on, turtle, modulus * 0.5, depth + 1, steps) turtle.up() turtle.goto(x, y) turtle.down() turtle.set_heading (heading + 240) turtle.forward (modulus) draw_sub_pattern(tracer_on, turtle, modulus * 0.5, depth + 1, steps)

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• Write data to an xml file.

  - by Bobby

  My aim is to write an XML file with few tags whose values are the regional language. I'm using Python to do this and using IDLE(Pythong GUI) for programming. While I try to write the words in an xmls file it gives the following error. UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-4: ordinal not in range(128) For now, I'm not using any xml writer library instead I'm opening a file "test.xml" and writing the data into it. This error is encountered by the line: f.write("\t\" + data + "\"). If I replace the above write statement with print statement then it prints the data properly on Python Shell. I'm reading the data from an excel file which is not in the UTF8,16, or 32 encoding formats. Its in some other format. cp1252 is reading the data properly. Any help in getting this data writtent oan xml would be highly appreciated. Thanks in advance. Bob

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• In a digital photo, detecting if a mountain is obscured by clouds.

  - by Gavin Brock

  The problem I have a collection of digital photos of a mountain in Japan. However the mountain is often obscured by clouds or fog. What techniques can I use to detect that the mountain is visible in the image? I am currently using Perl with the Imager module, but open to alternatives. All the images are taken from the exact same position - these are some samples. My naïve solution I started by taking several horizontal pixel samples of the mountain cone and comparing the brightness values to other samples from the sky. This worked well for differentiating good image 1 and bad image 2. However in the autumn it snowed and the mountain became brighter than the sky, like image 3, and my simple brightness test started to fail. Image 4 is an example of an edge case. I would classify this as a good image since some of the mountain is clearly visible.

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• Move Image or Div Up As Window Resizes?

  - by Wade D Ouellet

  Hi, I have an image in my html with a class of "stretch". Currently, with css, this image re-sizes as the window re-sizes to be 100% of the screen width. I would also like it to move upwards as the window is being re-sized. I'm assuming this can be done with jQuery but I am not quite sure. Basically the "top" css value just needs to change as the screen width does. Here is the css that is currently re-sizing it: .stretch { width: 100%; height: auto; min-height: 420px; position: absolute; top: -200px; } Thanks, Wade

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• Algorithm to fill slots

  - by Peter Lang

  I am searching for an algorithm to fill several slots, which are already filled to some level. The current levels and the available quantity to fill are known Resulting levels should be as equal as possible, but existing level cannot be reduced Slots are filled from left to right, so left slots get higher level if equal level is impossible       The image above shows six examples, each column represents a slot. The grey area is already filled, the blue are is the expected position of the new elements. I could iterate through my slots and increase the quantity on the lowest slot by 1 until the available quantity is consumed, but I wonder about how to actually calculate the new filling levels. I am going to implement this with SQL/PL/SQL, other code is just as welcome though :)

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