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  • 2D Collision in Canvas - Balls Overlapping When Velocity is High

    - by kushsolitary
    I am doing a simple experiment in canvas using Javascript in which some balls will be thrown on the screen with some initial velocity and then they will bounce on colliding with each other or with the walls. I managed to do the collision with walls perfectly but now the problem is with the collision with other balls. I am using the following code for it: //Check collision between two bodies function collides(b1, b2) { //Find the distance between their mid-points var dx = b1.x - b2.x, dy = b1.y - b2.y, dist = Math.round(Math.sqrt(dx*dx + dy*dy)); //Check if it is a collision if(dist <= (b1.r + b2.r)) { //Calculate the angles var angle = Math.atan2(dy, dx), sin = Math.sin(angle), cos = Math.cos(angle); //Calculate the old velocity components var v1x = b1.vx * cos, v2x = b2.vx * cos, v1y = b1.vy * sin, v2y = b2.vy * sin; //Calculate the new velocity components var vel1x = ((b1.m - b2.m) / (b1.m + b2.m)) * v1x + (2 * b2.m / (b1.m + b2.m)) * v2x, vel2x = (2 * b1.m / (b1.m + b2.m)) * v1x + ((b2.m - b1.m) / (b2.m + b1.m)) * v2x, vel1y = v1y, vel2y = v2y; //Set the new velocities b1.vx = vel1x; b2.vx = vel2x; b1.vy = vel1y; b2.vy = vel2y; } } You can see the experiment here. The problem is, some balls overlap each other and stick together while some of them rebound perfectly. I don't know what is causing this issue. Here's my balls object if that matters: function Ball() { //Random Positions this.x = 50 + Math.random() * W; this.y = 50 + Math.random() * H; //Random radii this.r = 15 + Math.random() * 30; this.m = this.r; //Random velocity components this.vx = 1 + Math.random() * 4; this.vy = 1 + Math.random() * 4; //Random shade of grey color this.c = Math.round(Math.random() * 200); this.draw = function() { ctx.beginPath(); ctx.fillStyle = "rgb(" + this.c + ", " + this.c + ", " + this.c + ")"; ctx.arc(this.x, this.y, this.r, 0, Math.PI*2, false); ctx.fill(); ctx.closePath(); } }

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  • Do I need to notify a user if I am using statistics software in an iPhone app?

    - by Chris
    Hello, I am currently creating a (very simple) Objective-C client to send basic statistical data to my server for an iPhone app - just things like the state of the app (first-launch or launch, error, etc), along with the make/model/version (i.e.: "iPod touch 4.2"). No personally identifiable information or location data is sent. Is there anything, in the Apple Developer agreement or otherwise, that states that I must notify the user if I am doing this? I'm not interested in selling the data or anything, I just want to use the data to make my apps better. I am not adverse to telling the user I am doing this if it is required, I just don't want to scare the users (the paranoid "oooh, they're tracking me, they know exactly where I am" crowd) if I don't have to. Thanks for any advice.

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  • NPOT texture and video memory usage

    - by Eonil
    I read in this QA that NPOT will take memory as much as next POT sized texture. It means it doesn't give any benefit than POT texture with proper management. (maybe even worse because NPOT should be slower!) Is this true? Does NPOT texture take and waste same memory like POT texture? I am considering NPOT texture for post-processing, so if it doesn't give memory space benefit, using of NPOT texture is meaningless to me. Maybe answer can be different for each platforms. I am targeting mobile devices. Such as iPhone or Androids. Does NPOT texture takes same amount of memory on mobile GPUs?

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  • Material usage, one per model or per object?

    - by WSkid
    Is it better (memory, time (of developer), space) to use single model that is unwrapped and uses a single material or to break a model down into appropriate bits, each with their own smaller texture/material? Or does it depend on the target platform as to what is acceptable - ie PC vs tablet? An example: Say you have a typical house with a tiled roof. Model it, make sure everything is attached, unwrap the walls/roof so in your UV template the walls and roof would be in one texture file, side-by-side in say a 512x512 file. Model the roof/walls as separate objects, unwrap them individually and have two UV templates. You could then have a 256x256 file for each one.

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  • Rendering only a part of the screen in high detail

    - by Bart van Heukelom
    If graphics are rendered for a large viewing angle (e.g. a very large TV or a VR headset), the viewer can't actually focus on the entire image, just a part of it. (Actually, this is the case for regular sized screens as well.) Combined with a way to track the viewer's eyes, you could theoretically exploit this and render the graphics away from the viewer's focus with progressively less details and resolution, gaining performance, without losing perceived quality. Are there any techniques for this available or under development today?

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  • Actual High Speed USB flash drive

    - by CSkau
    I'm looking to upgrade my EEE 1000H by possibly replacing the HDD with simple (internal) usb connected storage. The problem I'm having now is that I can't seem to find any actual high speed usb sticks. They all proclaim high speeds, but usually turn out to be ~30 mb/s - much lower than the 60 mb/s (480 mbit/s / 8 ) I understand USB 2.0 is at - no ? Can anyone enlighten me as to why no USB sticks seem to go past that low bar or alternatively point me in the direction of some actual high speed usb sticks ? Any help is greatly appreciated :) Cheers!

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  • "The volume filesystem root has only..."

    - by jcslzr
    I am having this problem in ubuntu 12.04, but I fin strange that when I go to /tmp it wont allow me to delete some files, with message "Operation not permitted" or "this file could not be handled because you dont have permissions to read it". It is only a PC and I have the root password. I was trying to get at least 2000 MB of free space on the root file system to upgrade to 12.10 and see if that resolved the problem. Currently free space on root file system is 190 MB. This is my output: root@jcsalazar-Vostro-3550:~# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda6 7688360 7112824 184984 98% / udev 2009288 4 2009284 1% /dev tmpfs 806636 1024 805612 1% /run none 5120 0 5120 0% /run/lock none 2016584 5316 2011268 1% /run/shm /dev/sda5 472036 255920 191745 58% /boot /dev/sda7 30758848 7085480 22110900 25% /home root@jcsalazar-Vostro-3550:~# sudo parted -l Model: ATA TOSHIBA MK3261GS (scsi) Disk /dev/sda: 320GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 106MB 105MB primary fat16 2 106MB 15.8GB 15.7GB primary ntfs boot 3 15.8GB 278GB 262GB primary ntfs 4 278GB 320GB 41.9GB extended 5 278GB 279GB 499MB logical ext4 6 279GB 287GB 7999MB logical ext4 7 287GB 319GB 32.0GB logical ext4 8 319GB 320GB 1443MB logical linux-swap(v1) I apprecciate any new ideas that can help me. Thnx Carlos

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  • How to See Your Estimated Data Usage in Windows 8

    - by Taylor Gibb
    Although you can use metered connections to get the most of your bandwidth in Windows 8, at times you may want to know how much data you have used for a single browsing session. Here’s how to do it. Why Your Android Phone Isn’t Getting Operating System Updates and What You Can Do About It How To Delete, Move, or Rename Locked Files in Windows HTG Explains: Why Screen Savers Are No Longer Necessary

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  • Keyword Usage For Maximum SEO

    After analyzing and ranking your keywords for profitability you now need to know what to do with them. The keywords you choose are only useful if you use them correctly. You don't need to know computer programming or even how the search engines work, just follow these simple tips and you will get the maximum search engine optimization benefit from your keywords.

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  • Can I copy large files faster without using the file cache?

    - by Veazer
    After adding the preload package, my applications seem to speed up but if I copy a large file, the file cache grows by more than double the size of the file. By transferring a single 3-4 GB virtualbox image or video file to an external drive, this huge cache seems to remove all the preloaded applications from memory, leading to increased load times and general performance drops. Is there a way to copy large, multi-gigabyte files without caching them (i.e. bypassing the file cache)? Or a way to whitelist or blacklist specific folders from being cached?

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  • Why df and du show different output

    - by Nischay
    When I execute command df -h /tmp it says disk utilization is 100% but when it tried du -sh /tmp it says disk utilization is 2%. I want to know why these commands shows different output and these two commands work and what is the solution of this problem. /var is installed on it own file system .I am using Ubuntu 12.04 server edition on my vps account.Due to this problem utilization of /tmp 100% according to df some programs complain about free space in /tmp.

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  • Enjoy High Traffic on Your Site With SEO

    Effective Internet marketing is necessary for a profitable online business. There are various advertising and marketing techniques that are used by business sites to increase website traffic. But one of the most important and effective techniques is SEO.

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  • How to ask developers to think about high resolution screens

    - by WhiteWind
    I just got a ASUS N56VZ laptop, and it`s all good, but the screen resolution 1920x1080px. I am not asking, how to scale ui elements. If someone is interested I have found some tricks: increase font size in system settings increase unity dock size in MyUnity or system settings in modern Ubuntu versions. tweak userChrome.js of FireFox to make buttons|panels|icons larger add DefaultZoomLevel extension to FireFox to make it zoom pages initially. But all of it is miserable, because there are some big bugs: window decoration elements are way too small to pick them with mouse. I can't scale window easily and I can't position my cursor fast on the close|maximize buttons. Tuning lines like in sound volume dialog are hardly clickable at all. Unity top panel (status panel & tray) hardly can contain the bigger font, so it looks ugly, but icons are still the same. Sometimes I can`t read text, as it is cropped (and I cant scale some dialogs as it has fixed size) Chromium is not usable at all (ok, it's not Ubuntu problem, but the problem still exists) JAVA applications are not scalable (same as above) In FF I am able to get descent results in most cases, but multiplication of system font increase and browser font increase makes system controls (combobox, lists, drop down lists) extremely big, so I cant even control the zoom level on the page. IMHO, we should post a bug report (but what kind of bug?) and vote for it! The problem is even deeper, but at least we should ask developers to think about it. So my question is: how can I post a report (the right words and right place) and how can we (who already has that problem, or who want it to be solved before hardware upgrade) vote for faster solution. Any ideas?

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  • Ways to Increase Targeted Traffic and Get Your Website Ranked High in Google For Free

    With so many web pages available on the internet you can be forgiven for thinking that there is no way at all that you could get your website ranked on the first page of Google. This however could not be further from the truth and you may be surprised at how easy it is to do this providing that you follow some guidelines and pick the keyword phrases that you wish to rank highly with carefully.

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  • Windows recv method usage

    - by vandamon taigi
    I'm making a multiplayer game and I have an issue with the recv function ( or the send one , not sure ). Server side code : char* UserName = new char[256]; ZeroMemory(UserName,256); recv(sConnect,UserName,256,0); // works char* Password = new char[256]; ZeroMemory(Password,256); recv(sConnect,Password,256,0); // works users[ ++usercount ] = new Client(UserName,Password,sConnect); if( users[usercount] ->GetLogInSuccesful() ) send(sConnect,"0x0001",6,0); // debugging shows it gets here and sends the data. Client side code : send(server->getsConnect(),User,256,0); // works send(server->getsConnect(),Pass,256,0); // works char* Response = new char[6]; ZeroMemory(Response,6); recv(server->getsConnect(),Response,6,0); // gets stuck here. Any ideea why does it get stuck on that recv ? I also tried by making response [256] or such.

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  • Can Anything be Done to Make Improv (a 1993 Win 3.1 App) handle larger Files?

    - by user75185
    My very favorite spradsheet is Improv, a 1993 Windows 3.1 application. It still puts Excel to shame for building spreadsheets and writing formulas. The only problem is because Improv was written when 1 Meg of RAM was state of the art, it becomes unstable when working with larger spreadsheets and often crashes and/or corrupts the data file. I am working on a project that greatly exceeds Improv's limits. Although it will ultimately require more robust databasing capability, I could save a lot of critical time if I could delay that headache and continue working in Improv for now. To that end, I moved to the only product I could find that comes close, Quantrix, which is nothing more than Improv updated to handle large spreadsheets and utilize today's technologies. The problems with Quantrix are its speed (significantly slower than Improv) and its $1000 price (which I cannot afford). I have already had 3 15 day extensions after the initial 30 day trial, so my time to use Quantrix as a bridge is at its end. Searches for Improv over the years have gotten me nowhere and, not surprisingly after reading some posts on this site, I got nothing for the money and time invested to find a programmer to write code to "fix" this problem. Improv is freely available as "abandonware" at http://vetusware.com/download/LotusImprov2.1/?id=5797 , and the best background info can be found on Wikipedia and at "Moose's Greatest Software Products of All Time - Lotus Improv" http://moosevalley.fhost.com.au/mooses_review_page_lotus_improv.html It is critically urgent for me to focus on analyzing the data asap. Working in a stable Improv would, without question, be the fastest route. To that end, I am looking for answers to the following questions and anything else that might be helpful: 1) Is it lawful to hire someone to fix Improv for my own use? If so, 2) About how much should it cost? 3) About how long should it take? 4) What skills should I be looking for &/or how should a post be worded? 5) Is there a niche site where it should it be posted? 6) What questions can I ask to quickly screen candidates? Since I am not a programmer, I need questions the answers to which leave no room to confuse me, whether intentional or not. For example, what tools or players should someone with an acceptable competency level have knowledge of?

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  • Oracle Partner Specialists – Sell & Deliver High Value Products to Customers

    - by Richard Lefebvre
    Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 Do you want to know where to find useful information about partner training and other activities to complete Oracle Specialization available in the country you are personally based? Go to the EMEA partner enablement blog and read latest information regarding training opportunities ready to join for Cloud Services, Applications, Business Intelligence, Middleware, Database 12c, Engineered System as well as Server & Storage. Recently, we announced new TestFest events in France, which you can join to pass your own Implementation Assessment within the Specialization category you have already chosen. To find out where and when the next TestFest close to your location will take place, please contact [email protected] or watch out for further announcements of TestFest events in your home country. Turnback to the EMEA Partner Enablement Blog from time to time to update your own Specialization and join the latest training for Sales, Presales or Implementation Specialists:  https://blogs.oracle.com/opnenablement/

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  • Deleted files not increasing available free space on Ubuntu (as reported by df -h)

    - by Homunculus Reticulli
    I am writing data munging scripts (python and bash), to munge data and import large quantities of text files into a database. I am currently in the test phase, so I am generating several K's of files and deleting them (the files consume about 20G of space). After a test run, I delete the files (sometimes without having imported into the database). I notice that there is a steady decrease in the amount of free space on my disk (as reported by df -h). I don't understand this, as I use rm * (in the data directory), and in the cases where I use Nautilus, I empty the Trash bin as well. Similarly, I notice that when I import the data into the (postgresql) database, and then delete the data from the tables using DELETE FROM tablename;, the size consumed in the postgresql data directory does not go down either. Currently, I have lost approximately 200G from hard drive, and I need to reclaim that - but don't know what to do to reclaim it - any ideas?. I am running Ubuntu 10.0.4 LTS + postgresql 8.4

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