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• WPF touch and slide/drag animation

  - by George

  I'm trying to create a pretty simple WPF interface, and from what I know this should be mostly possible using pure XAML. What I know I have a pretty basic understanding of WPF so far, however I have a decent grasp on XAML. I know or can work out how to put content in these panels. This isn't the topic of this question. What I don't know I don't know how to animate this interface. I'm not very proficient at binding, however again, that's not the topic of this question. The topic of this question is what would be the best way to animate panels 1-4 (images below) so that they may be dragged (via touch) into view. The number of panels here may be static for the purpose of this question. The panels (1-4) can be stack panels, grids or whatever; their content isnt important. What is important is the container that would contain all 4 panels. The complication in this animation is the other two containers here (Item One/TODO), as they're in the way of a smooth animation. If it makes this question simpler, the touch features can be ignored for now, and a simple button push can slide the containers across. One Two

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• IKImageView resize is blocky

  - by Brian Postow

  I am putting an image into an IKImageView, and immediately sizing it to fit. Whenever I do this, the image originally appears at 1-1 size (huge) and then resizes down, which would be fine if the animation was smooth. However, the animation looks ... fluttery? There are big blocks, like 2 inches square, of the image that appear and shrink independently of each other. The effect is a little annoying, and almost to the level where it might give an epileptic a seizure... (I'm exaggerating a little). Is this a bug in IKImageView? Is it a bug in the animation? Will it go away if I turn off the animation (How do I do that? setAnimates: NO doesn't seem to do anything, nor does overloading animates to return NO in my subclass... EDIT: addedcode: NSImage* image = [doc currentImage]; [imageView setImage: image]; [imageView zoomImageToFit: self]; This is in the app controller, so self is the application (or plugin, depending on which version I'm looking at)

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• Flex chart axis title blinking on resize

  - by Anoop

  I am having a chart with titles for horizontal and vertical axis. the verticalAxisTitleAlignment property of the vertical axis renderer is set to vertical. The application is a portal sort of thing and this chart is placed inside a small window. on click of the window am resizing the parent of the chart. but at that time the title of the axis is blinking and it provides a feeling that the resizing is not smooth. I dont understand why this happens? does the tile renders each time when the component is maximized? is there any way to stop that? Thanks in Advance, Cheers, PK This is the code am using to draw the title : <mx:horizontalAxis> <mx:LinearAxis id="haxis" title="Share" interval="5"/> </mx:horizontalAxis> <mx:verticalAxis> <mx:LinearAxis id="vaxis" title="{'Aided'+ '\n'+ ' awareness'}" interval="5"/> </mx:verticalAxis> <mx:horizontalAxisRenderers> <mx:AxisRenderer axis="{haxis}" axisStroke="{axisStroke}" tickPlacement="none"/> </mx:horizontalAxisRenderers> <mx:verticalAxisRenderers> <mx:AxisRenderer axis="{vaxis}" axisStroke="{axisStroke}" verticalAxisTitleAlignment="vertical" tickPlacement="none"/> </mx:verticalAxisRenderers>

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• jQuery animating scroll top to 0 not working on Windows Phone

  - by cgoddard

  I have written a website which has a function that scrolls the users view to the top of the page. The call in question is: $('html,body').animate({scrollTop:0}, 150, 'swing'); This works fine on all desktop browsers, but on Windows Phone, it only scrolls the user up about 180 pixels, then stops. I have tried replacing the function with: $('html,body').scrollTop(0); It snaps to the top on desktops, but it scrolls to the top on the phone. I believe this need for Internet Explorer Mobile to try to smoothly animate the scrolling, and is causing the issue. If this is the case (or if not, could someone correct me), how can I override this function to get the animation to work? EDIT Although its not ideal, it does seem to work in a limited capacity, I have replaced the scroll code with this: $('html,body').animate({scrollTop:0}, 150, 'swing', function() { $('html,body').scrollTop(0); }); But it would be good to know if there is an option to disable the smooth scrolling in Mobile IE programatically.

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• OpenCV Python HoughCircles error

  - by Dan

  Hi, I'm working on a program that detects circular shapes in images. I decided a Hough Transform would be the best, and I found one in the OpenCV library. The problem is that when I try to use it I get an error that I have no idea how to fix. Is OpenCV for Python not fully implemented? Is there a fix to the library I need for the program to work? Here's the code: import cv #cv.NamedWindow("camera", 1) capture = cv.CaptureFromCAM(0) while True: img = cv.QueryFrame(capture) gray = cv.CreateImage(cv.GetSize(img), 8, 1) edges = cv.CreateImage(cv.GetSize(img), 8, 1) cv.CvtColor(img, gray, cv.CV_BGR2GRAY) cv.Canny(gray, edges, 50, 200, 3) cv.Smooth(gray, gray, cv.CV_GAUSSIAN, 9, 9) storage = cv.CreateMat(1, 2, cv.CV_32FC3) #This is the line that throws the error cv.HoughCircles(edges, storage, cv.CV_HOUGH_GRADIENT, 2, gray.height/4, 200, 100) #cv.ShowImage("camera", img) if cv.WaitKey(10) == 27: break And here is the error I'm getting: OpenCV Error: Null pinter () in unknown function, file ..\..\..\..\ocv\openc\src\cxcore\cxdatastructs.cpp, line 408 Traceback (most recent call last): File "ellipse-detect-webcam.py", line 20, in cv.HoughCircles(edges, storage, cv.CV_HOUGH_GRADIENT, 2, gray.height/4, 200, 100) cv.error Thanks in advance for the help.

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• Manual drag-drop operations in Flex

  - by Yarin

  This is a two-part problem: A) I'm implementing several irregular drag-drop operations in Flex (e.g. DataGrid ItemRenderer into Tree). My preference was modifying DragManager operations to meet my needs, and in fact using DragManager allows me to do everything I need, but I'm having serious issues with performance. For example, dragging anything over a many-columned DataGrid, whether the drag was initiated with DragManager.doDrag, or just using native ListBase drag-drop functionality, slows the drag movement to a crawl. Even if the DataGrid is disabled/ not listenening for any move/drag events, this happens. On the other hand, if the drag is initiated by calling .startDrag() on the Sprite, the drag is smooth and performs great over DataGrids and everything else. So part A would be: Is there a reason why .startDrag() operations work so well, while drags initiated through DragManager.doDrag suffer so badly when over certain components? B) If indeed the solution is to handle drag-drops using .startDrag(), how would I go about determining what component the mouse is over when the drag is released? In my example, my dragged object is brought up to the top level of the display list, and so is being moved around in stage coordinates. mouseMove, mouseOver events don't fire on the components I'm dragging over because the mouse is constantly over the dragged component, so I would need some sort of stage.coordinate - visibleComponentAtThatCoordinate conversion. Any thoughts on this? Thanks alot!-- Yarin

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• open flash chart rails x-axis issue

  - by Jimmy

  Hey guys, I am using open flash chart 2 in my rails application. Everything is looking smooth except for the range on my x axis. I am creating a line to represent cell phone plan cost over a specific amount of usage and I'm generate 8 values, 1-5 are below the allowed usage while 6-8 are demonstrations of the cost for usage over the limit. The problem I'm encountering is how to set the range of the X axis in ruby on rails to something specific to the data. Right now the values being displayed are the indexes of the array that I'm giving. When I try to hand a hash to the values the chart doesn't even load at all. So basically I need help getting a way to set the data for my line properly so that it displays correctly, right now it is treating every value as if it represents the x value of the index of the array. Here is a screen shot which may be a better description than what I am saying: http://i163.photobucket.com/albums/t286/Xeno56/Screenshot.png Note that those values are correct just the range on the x-axis is incorrect, it should be something like 100, 200, 300, 400, 500, 600, 700 Code: y = YAxis.new y.set_range(0,100, 20) x_legend = XLegend.new("Usage") x_legend.set_style('{font-size: 20px; color: #778877}') y_legend = YLegend.new("Cost") y_legend.set_style('{font-size: 20px; color: #770077}') chart =OpenFlashChart.new chart.set_x_legend(x_legend) chart.set_y_legend(y_legend) chart.y_axis = y line = Line.new line.text = plan.name line.width = 2 line.color = '#006633' line.dot_size = 2 line.values = generate_data(plan) chart.add_element(line) def generate_data(plan) values = [] #generate below threshold numbers 5.times do |x| usage = plan.usage / 5 * x cost = plan.cost * 10 values << cost end #generate above threshold numbers 3.times do |x| usage = plan.usage + ((plan.usage / 5) * x) cost = plan.cost + (usage * plan.overage) values << cost end return values end

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• Speed Problem - Animating Height Change in UITableView

  - by Travis

  So I have a huge UITableView, between 1000 and 3000 rows. Each row needs to, when selected, expand to include several buttons. I do this by rendering the buttons below the cell, enabling clipping on the cells, and then just animating a change in height when they're selected. So I have heightForRowAtIndex checking if the row is selected, if so it gives a different height value. To do the animation, I have the following: - (void) tableView: (UITableView *) tableView didSelectRowAtIndexPath: (NSIndexPath *) indexPath { [self.tableView beginUpdates]; [self.tableView endUpdates]; } This all works wonderfully until I get around 1000 rows, at which point the animations still work and are still quite smooth, but they lag by a second or two. My first thought was a memory problem, but everything is being autoreleased and upon inspection my application isn't even receiving a memory warning message. So...any ideas on what this might be and how I can erase this lag between selection and change in cell height? Oh, and one last thing - right now I'm testing this on the iPad, so if this is a problem there, I expect it to be worse on our other target devices (iPhone and iPod).

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• SVN Workflow - Chicken Before the Egg - Before merging V1 with V2, I need code from V1 to work on V2

  - by Jake

  Hi, Our distributed team (3 internal devs and 3+ external devs) use SVN to manage our codebase for a web site. We have a branch for each minor version (4.1.0, 4.1.1, 4.1.2, etc...). We have a trunk which we merge each version into when we do a release and publish to our site. An example of the problem we are having is thus: A new feature is added, lets call it "Ability to Create A Project" to 4.1.1. Another feature which depends on the one in 4.1.1 is scheduled to go in 4.1.2, called "Ability to Add Tasks to Projects". So, on Monday, we say 4.1.1 is 'closed' and needs to be tested. Our remote developers usually will start working on features/tickets for 4.1.2 at this point. Throughout the week we will test 4.1.1 and fix any bugs and commit them back to 4.1.1. Then, on Friday or so, we will tag 4.1.1, merge it with trunk, and finally, merge it with 4.1.2. But, for the 4-5 days we are testing, 4.1.2 doesn't have the code from 4.1.1 that some of the new features for 4.1.2 depend on. So a dev who is adding the "Ability to Add Tasks To Projects" feature, doesn't have the "Ability to Create a Project" feature to build upon, and has to do some file copy shenanigans to be able to keep working on it. What could/should we do to smooth out this process? P.S. Apologies if this question has been asked before - I did search but couldn't find what I'm looking for.

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• program not working as expected!

  - by wilson88

  Can anyone just help spot why my program is not returning the expected output.related to my previous question.Am passing a vector by refrence, I want to see whats in the container before I copy them to another loaction.if u remove comments on loadRage, u will see bids are generated by the trader. #include <iostream> #include <vector> #include <string> #include <algorithm> #include <cstdlib> #include <iomanip> using namespace std; const int NUMSELLER = 1; const int NUMBUYER = 1; const int NUMBIDS = 20; const int MINQUANTITY = 1; const int MAXQUANTITY = 30; const int MINPRICE =100; const int MAXPRICE = 150; int s=0; int trdId; // Bid, simple container for values struct Bid { int bidId, trdId, qty, price; char type; // for sort and find. bool operator<(const Bid &other) const { return price < other.price; } bool operator==(int bidId) const { return this->bidId == bidId; } }; // alias to the list, make type consistent typedef vector<Bid> BidList; // this class generates bids! class Trader { private: int nextBidId; public: Trader(); Bid getNextBid(); Bid getNextBid(char type); // generate a number of bids void loadRange(BidList &, int size); void loadRange(BidList &, char type, int size); void setVector(); }; Trader::Trader() : nextBidId(1) {} #define RAND_RANGE(min, max) ((rand() % (max-min+1)) + min) Bid Trader::getNextBid() { char type = RAND_RANGE('A','B'); return getNextBid(type); } Bid Trader::getNextBid(char type) { for(int i = 0; i < NUMSELLER+NUMBUYER; i++) { // int trdId = RAND_RANGE(1,9); if (s<10){trdId=0;type='A';} else {trdId=1;type='B';} s++; int qty = RAND_RANGE(MINQUANTITY, MAXQUANTITY); int price = RAND_RANGE(MINPRICE, MAXPRICE); Bid bid = {nextBidId++, trdId, qty, price, type}; return bid; } } //void Trader::loadRange(BidList &list, int size) { // for (int i=0; i<size; i++) { list.push_back(getNextBid()); } //} // //void Trader::loadRange(BidList &list, char type, int size) { // for (int i=0; i<size; i++) { list.push_back(getNextBid(type)); } //} //---------------------------AUCTIONEER------------------------------------------- class Auctioneer { vector<Auctioneer> List; Trader trader; vector<Bid> list; public: Auctioneer(){}; void accept_bids(const BidList& bid); }; typedef vector<Auctioneer*> bidlist; void Auctioneer::accept_bids(const BidList& bid){ BidList list; //copy (BidList.begin(),BidList.end(),list); } //all the happy display commands void show(const Bid &bid) { cout << "\tBid\t(" << setw(3) << bid.bidId << "\t " << setw(3) << bid.trdId << "\t " << setw(3) << bid.type <<"\t " << setw(3) << bid.qty <<"\t " << setw(3) << bid.price <<")\t\n " ; } void show(const BidList &list) { cout << "\t\tBidID | TradID | Type | Qty | Price \n\n"; for(BidList::const_iterator itr=list.begin(); itr != list.end(); ++itr) { //cout <<"\t\t"; show(*itr); cout << endl; } cout << endl; } //search now checks for failure void show(const char *msg, const BidList &list) { cout << msg << endl; show(list); } void searchTest(BidList &list, int bidId) { cout << "Searching for Bid " << bidId << endl; BidList::const_iterator itr = find(list.begin(), list.end(), bidId); if (itr==list.end()) { cout << "Bid not found."; } else { cout << "Bid has been found. Its : "; show(*itr); } cout << endl; } //comparator function for price: returns true when x belongs before y bool compareBidList(Bid one, Bid two) { if (one.type == 'A' && two.type == 'B') return (one.price < two.price); return false; } void sort(BidList &bidlist) { sort(bidlist.begin(), bidlist.end(), compareBidList); } int main(int argc, char **argv) { Trader trader; BidList bidlist; Auctioneer auctioneer; //bidlist list; auctioneer.accept_bids(bidlist); //trader.loadRange(bidlist, NUMBIDS); show("Bids before sort:", bidlist); sort(bidlist); show("Bids after sort:", bidlist); system("pause"); return 0; }

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• How do I pass a lot of parameters to views in Django?

  - by Mark

  I'm very new to Django and I'm trying to build an application to present my data in tables and charts. Till now my learning process went very smooth, but now I'm a bit stuck. My pageview retrieves large amounts of data from a database and puts it in the context. The template then generates different html-tables. So far so good. Now I want to add different charts to the template. I manage to do this by defining <img src=".../> tags. The Matplotlib chart is generate in my chartview an returned via: response=HttpResponse(content_type='image/png') canvas.print_png(response) return response Now I have different questions: the data is retrieved twice from the database. Once in the pageview to render the tables, and again in the chartview for making the charts. What is the best way to pass the data, already in the context of the page to the chartview? I need a lot of charts, each with different datasets. I could make a chartview for each chart, but probably there is a better way. How do I pass the different dataset names to the chartview? Some charts have 20 datasets, so I don't think that passing these dataset parameters via the url (like: <imgm src="chart/dataset1/dataset2/.../dataset20/chart.png />) is the right way. Any advice?

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• Fast screen capture and lost Vsync

  - by user338759

  Hi, I'd like to generate a movie in real time with a self-made application doing fast screen captures with part of the screen occupied by a running 3D application. I'm aware that several applications already exist for this (like FRAPS or Taksi), and even dedicated DirectShow filters (like UScreenCapture), but i really need to make this with my own external application. When correctly setup (UScreenCapture + ffdshow), capturing an compressing a full screen does not consumes as much CPU as you would expect (about 15%), and does not impairs the performances of the 3D app. The problem of doing a capture from an external application is that the 3D application loses it's Vsync and creates a shaggy, difficult to use 3D application (3D app is only presented on a small part of the screen, the rest being GDI, DirectX) FRAPS solves this problem by allowing you to capture only one application at a time (the one with focus). Depending on the technology used (OpenGl, DirectX, GDI), it hooks the Vsync and does its capture (with glReadPixels,...), without perturbing it. Doing this does not solve my problem, since I want the full composed screen image (including 3D and the rest) AND a smooth 3D app. The UScreenCapture seems to use a fast DirectX call to capture the whole screen, but the openGL 3D app is still out of sync. Doing a BitBlt is too slow and CPU consumming to do real time 30 fps acquisition (at least under windows XP, not sure with 7) My question is to know if there is a way to achieve my goal with Windows 7 and it's brand new DirectX compositing engine? Windows 7 succeeds to show live VSynced duplicated previews of every app (in the taskbar), so there must be a way to access the currenlty displayed screen buffer without perturbing the rendering of the 3D OpenGL app ? Any other suggestion, technology ? thank you

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• Odd background image resizing on animating UIView

  - by Woody

  I have a UIView in the middle of a view that I am using as a game playing area (in a 2d cocoa view). This image has a background image of the same size as the view. Resizing the view I use animation to make it look smooth (and that works fine). However, when the animation starts, the background image immediately changes size, tiling or being clipped to a size that when the animation finishes, the background image is physically the same size. I don't want this, I want the image to always fit the view, regardless of the view size. UIImage *bgImage = [UIImage imageNamed:@"head.png"]; ... // resize the image returning another image self.view.backgroundColor = [[UIColor alloc] initWithPatternImage:resizedImage]; [UIView beginAnimations:@"resizeView" context:nil]; [UIView setAnimationDuration:.5]; int localViewSize = ... // work out view sizes self.view.frame = CGRectMake(... ,localViewSize,localViewSize); [UIView commitAnimations]; It looks very odd as it jumps to a different size, then animates to the original size. I am guessing that maybe I would have to make a separate view underneath my main view but is that the only way?

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• listView dynamic add item

  - by pengwang

  hello,I used ListView to dynamic add item,but there is a problem about not Smooth add. there are textView and button in my listActivity,Iwant to Press button ,then textView"s text can auto add to listView,but i Pressed button ,it donot work,unless after i enter content , press "OK"Key ,then Pressed button ,textView"s text can auto add to listView. I donot know why. if I continuous Pressed button ,as3 times, then press "Ok"Key ,the content auto add list View but 3 times. public class DynamicListItems extends ListActivity { private static final String ITEM_KEY = "key"; ArrayList<HashMap<String, String>> list= new ArrayList<HashMap<String, String>>(); private SimpleAdapter adapter; private EditText newValue;@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.dynamic_list); newValue = (EditText) findViewById(R.id.new_value_field); setListAdapter(new SimpleAdapter(this, list, R.layout.row, new String[] { ITEM_KEY }, new int[] { R.id.list_value })); ((ImageButton) findViewById(R.id.button)).setOnClickListener(getBtnClickListener()); } private OnClickListener getBtnClickListener() { return new OnClickListener() { public void onClick(View view) { try { HashMap<String, String> item = new HashMap<String, String>(); item.put(ITEM_KEY, newValue.getText().toString()); list.add(item); adapter.notifyDataSetChanged(); } catch (NullPointerException e) { Log.i("[Dynamic Items]", "Tried to add null value"); } } }; }} my another question is how to dynamic delete the item,which event i need to used,could you give me some directions or Code snippets? dynamic_list.xml only contains listView ,button,textView row.xml contains TextView . i amm sorry i donot edit code together.

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• WPF performance on scaling a large scene

  - by Mark

  I have a full screen app that I want to be able to zoom in on certain areas. I have the code working fine, but I notice that when I get closer in, the zoom in animation (which animates the ScaleTransform.ScaleX and ScaleTransform.ScaleY properties on a Parent canvas) starts to jerk down a little and the frame rate suffers. Im not using any BitmapEffects or anything, and ideally I would like my scene to get more complicated than it currently already is. The scene is quite large, 1980x1024, this is a requirement and cannot be changed. The current layout is like this: <Canvas x:name="LayoutRoot"> <Canvas x:Name="ContainerCanvas"> <local:MyControl x:Name="c1" /> <!-- numerous or ther controls and elements that compose the scene --> </Canvas> </Canvas> The code that zooms in just animates the RenderTransform of the ContainerCanvas, which in tern, scales its children which gives the desired effect. However, Im wondering if I need to swap out the ContainerCanvas for a ViewBox or something like that? Ive never really worked with ViewBox/Viewport controls before in WPF can they even help me out here? Smooth zooming is a huge requirement of the client and I must get this resolved. All ideas are welcome Thanks a lot Mark

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• jQuery fadeIn/fadeOut loop problem

  - by liebgott

  Hi. I'm trying to do a sequentiall animation with a loop....but i can't accomplish it in a smooth way (some "lag" problems). jQuery var i = 0; var b = 0; var fades = function(){$(".caja").stop(0).each(function(){ $(this).delay(i * 500).fadeIn('slow', function(){ $(this).delay(5000).fadeOut('slow', function(){ $(".cajar").delay(1000).each(function(){ $(this).delay(b * 500).fadeIn('slow', function(){ $(this).delay(5000).fadeOut('slow', fades()); }); b++; }); }); }); i++; })} fades(); CSS .caja{ width: 150px; height: 150px; background-color: black; float: left; margin: 0 10px 0 0; display: none; } .cajar{ width: 150px; height: 150px; background-color: red; float: left; margin: 0 10px 0 0; display: none; } .cajav{ width: 150px; height: 150px; background-color: green; float: left; margin: 0 10px 0 0; display: none; } HTML <div class="caja"></div> <div class="caja"></div> <div class="caja"></div> <div class="cleaner"></div> <div class="cajar"></div> <div class="cajar"></div> <div class="cajar"></div> Thanks!

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• How to scale a sprite image without losing color key information?

  - by Michael P

  Hello everyone, I'm currently developing a simple application that displays map and draws some markers on it. I'm developing for Windows Mobile, so I decided to use DirectDraw and Imaging interfaces to make the application fast and pretty. The map moves when user moves finger on the touchscreen, so the whole map moving/scrolling animation has to be fast, but it is not. On every map update I have to draw portion of the map, control buttons, and markers - buttons and markers are preloaded on DirectDraw surface as a mipmap. So the only thing I do is BitBlit from the mipmap to a back buffer, and from the back buffer to a primary surface (I can't use page flipping due to the windowed mode of my application). Previously I used premultiplied-alpha surface with 32 bit ARGB pixel format for images mipmap, everything was looking good, but drawing entire "scene" was horribly slow - i could forget about smooth map scrolling. Now I'm using mipmap with native (RGB565) pixel format and fuchsia (0xFF00FF) color key. Drawing is much better my mipmap surface is generated on program loading - images are loaded from files, scaled (with filtering) and drawn on mipmap. The problem is, that image scaling process blends pixel colors, and those pixels which are on the border of a sprite region are blended with surrounding fuchsia pixels resulting semi-fuchsia color that is not treated as color key. When I do blitting with color key option, sprites have small fuchsia-like borders, and it looks really bad. How to solve this problem? I can use alpha blitting, but it is too slow - even in ARGB 1555 format.

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• Writing to a log4net FileAppender with multiple threads performance problems

  - by Wayne

  TickZoom is a very high performance app which uses it's own parallelization library and multiple O/S threads for smooth utilization of multi-core computers. The app hits a bottleneck where users need to write information to a LogAppender from separate O/S threads. The FileAppender uses the MinimalLock feature so that each thread can lock and write to the file and then release it for the next thread to write. If MinimalLock gets disabled, log4net reports errors about the file being already locked by another process (thread). A better way for log4net to do this would be to have a single thread that takes care of writing to the FileAppender and any other threads simply add their messages to a queue. In that way, MinimalLock could be disabled to greatly improve performance of logging. Additionally, the application does a lot of CPU intensive work so it will also improve performance to use a separate thread for writing to the file so the CPU never waits on the I/O to complete. So the question is, does log4net already offer this feature? If so, how do you do enable threaded writing to a file? Is there another, more advanced appender, perhaps? If not, then since log4net is already wrapped in the platform, that makes it possible to implement a separate thread and queue for this purpose in the TickZoom code. Sincerely, Wayne

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• Actionscript 3.0 - drag and throw with easing

  - by Joe Hamilton

  I'm creating a map in flash and I would like to have a smooth movement similar to this: http://www.conceptm.nl/ I have made a start but I'm having trouble taking it to the next stage. My code currently throws the movieclip after the mouse is release but there is no easing while the mouse button is down. Any tips on how I would achieve this? Here is my current code: // Vars var previousPostionX:Number; var previousPostionY:Number; var throwSpeedX:Number; var throwSpeedY:Number; var isItDown:Boolean; // Event Listeners addEventListener(MouseEvent.MOUSE_DOWN, clicked); addEventListener(MouseEvent.MOUSE_UP, released); // Event Handlers function clicked(theEvent:Event) { isItDown =true; addEventListener(Event.ENTER_FRAME, updateView); } function released(theEvent:Event) { isItDown =false; } function updateView(theEvent:Event) { if (isItDown==true){ throwSpeedX = mouseX - previousPostionX; throwSpeedY = mouseY - previousPostionY; mcTestMovieClip.x = mouseX; mcTestMovieClip.y = mouseY; } else{ mcTestMovieClip.x += throwSpeedX; mcTestMovieClip.y += throwSpeedY; throwSpeedX *=0.9; throwSpeedY *=0.9; } previousPostionX= mcTestMovieClip.x; previousPostionY= mcTestMovieClip.y; }

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• Understanding CABasicAnimation when spinning an object from a random angle....

  - by user157733

  I have spent ages trying to figure this out and I am still having problems. I want to rotate an image a random number of time - say 5 and a bit - then have it stop. I then want to rotate it again FROM ITS STOPPED POSITION. I am having difficulty with this so maybe someone can advise me on the right way to do it. Ok so I am using a CABasicAnimation for the spin like this... CABasicAnimation* rotationAnimation; rotationAnimation = [NSNumber numberWithFloat: 0.0]; rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 1.0]; rotationAnimation.duration = 100; rotationAnimation.cumulative = YES; rotationAnimation.repeatCount = 5.2; rotationAnimation.removedOnCompletion = NO; rotationAnimation.fillMode = kCAFillModeForwards; [myView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"]; This works fine. I use a animationDidStop function to transform the image to the new angle so that it actually in the new position (not just appearing that way). This is where my problems start. I have tried the following... removing the toValue line which means the animation starts from where it currently is but when the animation block is repeated it jumps back to this start position every time the block is run storing the value of the end rotation and using this in the toValue so the 2 lines of code become... rotationAnimation = [NSNumber numberWithFloat: previousVal]; rotationAnimation.toValue = [NSNumber numberWithFloat: (M_PI * 1.0)+previousVal]; when I do this the animation still jumps because it is flicking back to the previousVal everytime the block is repeated Therefore my final thought is to check to see if the image is at zero, if not then rotate it to zero, then impliment the block of code to spin multiple times. This seems complicated but is this the ONLY way to achieve this? I am concerned about getting the timings smooth with this method. Any suggestions would be amazing! Thanks

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• Variant datatype library for C

  - by Joey Adams

  Is there a decent open-source C library for storing and manipulating dynamically-typed variables (a.k.a. variants)? I'm primarily interested in atomic values (int8, int16, int32, uint, strings, blobs, etc.), while JSON-style arrays and objects as well as custom objects would also be nice. A major case where such a library would be useful is in working with SQL databases. The most obvious feature of such a library would be a single type for all supported values, e.g.: struct Variant { enum Type type; union { int8_t int8_; int16_t int16_; // ... }; }; Other features might include converting Variant objects to/from C structures (using a binding table), converting values to/from strings, and integration with an existing database library such as SQLite. Note: I do not believe this is question is a duplicate of http://stackoverflow.com/questions/649649/any-library-for-generic-datatypes-in-c , which refers to "queues, trees, maps, lists". What I'm talking about focuses more on making working with SQL databases roughly as smooth as working with them in interpreted languages.

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• Redraw and flicker issues

  - by AngryHacker

  I have an Outlook style app. So basically I have a sidebar on the left and on the right I have a panel control (pnlMainBody) that hosts content. The content is typically a user control that I add to the panel when user clicks appropriate button in the side bar. The way I add the user control to the panel is as follows: // _pnlEmails is the User Control that I am adding to the panel _pnlEmails = new pnlEmails(); _pnlEmails.Dock = DockStyle.Fill; this.pnlMainBody.Controls.Add(_pnlEmails); Some of the user controls that I add to the main panel are quite complex UI-wise. So when this.pnlMainBody.Controls.Add(_pnlEmails); fires, I see the control appear on the screen, then it resizes itself to fill the body of the panel control. It's quite ugly actually, so I was wondering whether there is a way to not show the resizing until it's actually done resizing? I've tried setting the user control's .Visible to false. I've tried doing .SuspendLayout, all to no avail. Is there a way to do this so the screen transitions are smooth?

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• How do I find the most “Naturally" direct route using A-star (A*)

  - by Greg B

  I have implemented the A* algorithm in AS3 and it works great except for one thing. Often the resulting path does not take the most “natural” or smooth route to the target. In my environment the object can move diagonally as inexpensively as it can move horizontally or vertically. Here is a very simple example; the start point is marked by the S, and the end (or finish) point by the F. | | | | | | | | | | |S| | | | | | | | | x| | | | | | | | | | x| | | | | | | | | | x| | | | | | | | | | x| | | | | | | | | | x| | | | | | | | | | |F| | | | | | | | | | | | | | | | | | | | | | | | | | | | | As you can see, during the 1st round of finding, nodes [0,2], [1,2], [2,2] will all be added to the list of possible node as they all have a score of N. The issue I’m having comes at the next point when I’m trying to decide which node to proceed with. In the example above I am using possibleNodes[0] to choose the next node. If I change this to possibleNodes[possibleNodes.length-1] I get the following path. | | | | | | | | | | |S| | | | | | | | | | |x| | | | | | | | | | |x| | | | | | | | | | |x| | | | | | | | |x| | | | | | | | |x| | | | | | | | |F| | | | | | | | | | | | | | | | | | | | | | | | | | | | | And then with possibleNextNodes[Math.round(possibleNextNodes.length / 2)-1] | | | | | | | | | | |S| | | | | | | | | |x| | | | | | | | | x| | | | | | | | | | x| | | | | | | | | | x| | | | | | | | | | x| | | | | | | | | | |F| | | | | | | | | | | | | | | | | | | | | | | | | | | | | All these paths have the same cost as they all contain the same number of steps but, in this situation, the most sensible path would be as follows... | | | | | | | | | | |S| | | | | | | | | |x| | | | | | | | | |x| | | | | | | | | |x| | | | | | | | | |x| | | | | | | | | |x| | | | | | | | | |F| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Is there a formally accepted method of making the path appear more sensible rather than just mathematically correct?

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• iPhone UITableView stutters with custom cells. How can I get it to scroll smoothly?

  - by Charles S.

  I'm using a UITableView to display custom cells created with Interface Builder. The table scrolling isn't very smooth (it "stutters") which leaves me to believe cells aren't being reused. Is there something wrong with this code? - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"TwitterCell"; TwitterCell *cell = (TwitterCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil){ //new cell NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"TwitterCell" owner:nil options:nil]; for(id currentObject in topLevelObjects) { if([currentObject isKindOfClass:[TwitterCell class]]) { cell = (TwitterCell *)currentObject; break; } } } if([self.tweets count] > 0) { cell.lblUser.text = [[self.tweets objectAtIndex:[indexPath row]] username]; cell.lblTime.text = [[self.tweets objectAtIndex:[indexPath row]] time]; [cell.txtText setText:[[self.tweets objectAtIndex:[indexPath row]] text]]; [[cell imgImage] setImage:[[self.tweets objectAtIndex:[indexPath row]] image]]; } else { cell.txtText.text = @"Loading..."; } cell.selectionStyle = UITableViewCellSelectionStyleNone; return cell; }

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• web browser become slow or no response after several ajax calls

  - by Patrick

  I'm totally newbie to jquery and ajax, my recently project is to help the representatives (reps) to manage customer quotations online. I have a page which displays all the quotations in a big table. I've managed to use ajax to fetch and display the quotations which associate to a particular rep after i click that rep's name. But the only problem is the speed of response. The first few clicks are ok and very smooth. But after several tries, the response become slow and I cant even scroll down the webpage, and later on the web browser craches.... Please have a look at my ajax code. here it is: <!-- AJAX FETCH QUOTES DATA + Tablesorter + FIXED TABLE HEADER--> <script type="text/javascript"> //<![CDATA[ $(function(){ $("a.repID").click(function(){ $('div#loader').append("<p align='center'><img src='images/loadingbar2.gif' id='loading' /></p>"); var repID = $(this).attr("title"); $.ajax({ type:'POST', url:'quote_info.php', data:'repID=' + repID, cache: false, success:function(data) { $("#container").html('<div id="content">' + data + '</div>'); $("#loading").fadeOut(500, function() {$(this).remove();}); $("#sortme").tablesorter(); $('.tbl').fixedtableheader(); } }); return false; }); }); </script> <!-- AJAX FETCH QUOTES DATA + Tablesorter + FIXED TABLE HEADER-->

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