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  • GNOME Usability Hackfest

    Google recently sponsored the GNOME Usability Hackfest , which took place in London. With over 30 GNOME design and usability experts attending on some days, it was an...

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  • Collision Detection for 2D

    - by Bhaskar
    I am working on a simple game, where I need to do a collision detection of two Texture2D. The code I have written is: bool perPixelCollission = false; Texture2D texture1 = sprite1.Texture; Texture2D texture2 = sprite1.Texture; Vector2 position1 = new Vector2(sprite1.CurrentScope.X, sprite1.CurrentScope.Y); Vector2 position2 = new Vector2(sprite2.CurrentScope.X, sprite2.CurrentScope.Y); uint[] bitsA = new uint[texture1.Width * texture1.Height]; uint[] bitsB = new uint[texture2.Width * texture2.Height]; Rectangle texture1Rectangle = new Rectangle(Convert.ToInt32(position1.X), Convert.ToInt32(position1.Y), texture1.Width, texture1.Height); Rectangle texture2Rectangle = new Rectangle(Convert.ToInt32(position2.X), Convert.ToInt32(position2.Y), texture2.Width, texture2.Height); texture1.GetData<uint>(bitsA); texture2.GetData<uint>(bitsB); int x1 = Math.Max(texture1Rectangle.X, texture2Rectangle.X); int x2 = Math.Min(texture1Rectangle.X + texture1Rectangle.Width, texture2Rectangle.X + texture2Rectangle.Width); int y1 = Math.Max(texture1Rectangle.Y, texture2Rectangle.Y); int y2 = Math.Min(texture1Rectangle.Y + texture1Rectangle.Height, texture2Rectangle.Y + texture2Rectangle.Height); for (int y = y1; y < y2; ++y) { for (int x = x1; x < x2; ++x) { if (((bitsA[(x - texture1Rectangle.X) + (y - texture1Rectangle.Y) * texture1Rectangle.Width] & 0xFF000000) >> 24) > 20 && ((bitsB[(x - texture2Rectangle.X) + (y - texture2Rectangle.Y) * texture2Rectangle.Width] & 0xFF000000) >> 24) > 20) { perPixelCollission = true; break; } } // Reduce amount of looping by breaking out of this. if (perPixelCollission) { break; } } return perPixelCollission; But this code is really making the game slow. Where can I get some very good collision detection tutorial and code? What is wrong in this code?

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  • On Android Compatibility

    [This post is by Dan Morrill, Open Source & Compatibility Program Manager. — Tim Bray] At Google I/O 2010, we announced that there are over 60 Android models...

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  • Google I/O 2012 - What's Next for Chrome Extensions?

    Google I/O 2012 - What's Next for Chrome Extensions? Mike West Chrome's extension system offers developers more opportunities than ever to customize and enhance users' experience on the web. New APIs are landing on a regular basis that provide new functionality and deeper hooks into Chrome itself. Join us for a walk through bleeding edge changes to Chrome's extension framework that increase security, improve performance, and make it easier than ever for users to get up and running with the product of your hard work. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 1372 29 ratings Time: 51:36 More in Science & Technology

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  • G+ Platform Office Hours -- Retrieving Profile Information with the Sign In Button

    G+ Platform Office Hours -- Retrieving Profile Information with the Sign In Button Join us for a live coding demo of the sign in button and how to retrieve profile information using it! Or skip ahead to what you really care about: Meet your presenters: goo.gl Render the Sign-In Button: goo.gl Add a Client ID: goo.gl See Sign-In Render: goo.gl Grab the user resource (with live XHR/REST debugging*!): goo.gl Retrieve and render the user resource: goo.gl *If you don't feel you need a debugging crash course, feel free to skip from 10:14 to 18:30. :) From: GoogleDevelopers Views: 659 17 ratings Time: 29:39 More in Science & Technology

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  • Google I/O 2012 - Monetizing Android Apps

    Google I/O 2012 - Monetizing Android Apps Chrix Finne, Kenneth Lui There's more than one way to make money with your Android app: Paid apps, in-app billing, advertising, and so on. This session covers the subject comprehensively, with details on the monetization tools in Google Play and a close look at the AdMob SDK, ad network mediation and Google Analytics. Walk away armed with knowledge on how you can make more money, get more users and gain more insights. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 198 7 ratings Time: 52:49 More in Science & Technology

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  • Google Maps Developers Live: Ships, Polylines, Symbols, Oh My!

    Google Maps Developers Live: Ships, Polylines, Symbols, Oh My! For the second part of our "A Journey of 245k Points" series, Paul shows some cool tricks for making stunning map visualizations of numerous ship voyages using polylines, making polylines interactive, and animating voyages with symbols. Data Source: CLIWOC (Climatological Database for the World's Oceans, 1750-1850): www.ucm.es From: GoogleDevelopers Views: 0 0 ratings Time: 30:00 More in Education

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  • Hangouts API v1.1 Walkthrough

    Hangouts API v1.1 Walkthrough Introduction to 3 new features in v1.1 of the Hangouts API. This release introduces the ability for your app to respond to face movements in real time. It also provides a new overlay positioned relative to the video feed, new low-latency messages, Hangouts on Air support, the ability to enter any OAuth scope, and a few other miscellaneous features. From: GoogleDevelopers Views: 4425 0 ratings Time: 01:14 More in Science & Technology

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  • How to refactor a method which breaks "The law of Demeter" principle?

    - by dreza
    I often find myself breaking this principle (not intentially, just through bad design). However recently I've seen a bit of code that I'm not sure of the best approach. I have a number of classes. For simplicity I've taken out the bulk of the classes methods etc public class Paddock { public SoilType Soil { get; private set; } // a whole bunch of other properties around paddock information } public class SoilType { public SoilDrainageType Drainage { get; private set; } // a whole bunch of other properties around soil types } public class SoilDrainageType { // a whole bunch of public properties that expose soil drainage values public double GetProportionOfDrainage(SoilType soil, double blockRatio) { // This method does a number of calculations using public properties // exposed off SoilType as well as the blockRatio value in some conditions } } In the code I have seen in a number of places calls like so paddock.Soil.Drainage.GetProportionOfDrainage(paddock.Soil, paddock.GetBlockRatio()); or within the block object itself in places it's Soil.Drainage.GetProportionOfDrainage(this.Soil, this.GetBlockRatio()); Upon reading this seems to break "The Law of Demeter" in that I'm chaining together these properties to access the method I want. So my thought in order to adjust this was to create public methods on SoilType and Paddock that contains wrappers i.e. on paddock it would be public class Paddock { public double GetProportionOfDrainage() { return Soil.GetProportionOfDrainage(this.GetBlockRatio()); } } on the SoilType it would be public class SoilType { public double GetProportionOfDrainage(double blockRatio) { return Drainage.GetProportionOfDrainage(this, blockRatio); } } so now calls where it used would be simply // used outside of paddock class where we can access instances of Paddock paddock.GetProportionofDrainage() or this.GetProportionOfDrainage(); // if used within Paddock class This seemed like a nice alternative. However now I have a concern over how would I enforce this usage and stop anyone else from writing code such as paddock.Soil.Drainage.GetProportionOfDrainage(paddock.Soil, paddock.GetBlockRatio()); rather than just paddock.GetProportionOfDrainage(); I need the properties to remain public at this stage as they are too ingrained in usage throughout the code block. However I don't really want a mixture of accessing the method on DrainageType directly as that seems to defeat the purpose altogether. What would be the appropiate design approach in this situation? I can provide more information as required to better help in answers. Is my thoughts on refactoring this even appropiate or should is it best to leave it as is and use the property chaining to access the method as and when required?

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  • Google I/O 2012 - YouTube Channels: Get with the Program!

    Google I/O 2012 - YouTube Channels: Get with the Program! Dror Shimshowitz, AJ Crane YouTube allows anyone to distribute videos to 800m web, mobile and TV viewers around the world. Come learn how to leverage this powerful platform to build an audience and market your products. We'll walk you through tips and techniques for building, programming, and promoting your very own YouTube channel. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 0 0 ratings Time: 53:11 More in Science & Technology

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  • Create simple jQuery plugin

    - by ybbest
    In the last post, I have shown you how to add the function to jQuery. In this post, I will show you how to create plugin to achieve this. 1. You need to wrap your code in the following construct, this is because you should not use $ directly as $ is global variable, it could have clash with some other library which also use $.Basically, you can pass in jQuery object into the function, so that $ is made available inside the function. (JavaScript use function to create scope, so you can make sure $ is referred to jQuery inside the function ) (function($){ //Your code goes here. }; })(jQuery); 2. Put your code into the construct above. (function ($) { $.getParameterByName = function (name) { name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]"); var regexS = "[\\?&]" + name + "=([^&#]*)"; var regex = new RegExp(regexS); var results = regex.exec(window.location.search); if (results == null) return ""; else return decodeURIComponent(results[1].replace(/\+/g, " ")); }; })(jQuery); 3. Now you can reference the code into you project and you can call the method in you JavaScript References: Provides scope for variables Variables are scoped at the function level in javascript. This is different to what you might be used to in a language like C# or Java where the variables are scoped to the block. What this means is if you declare a variable inside a loop or an if statement, it will be available to the entire function. If you ever find yourself needing to explicitly scope a variable inside a function you can use an anonymous function to do this. You can actually create an anonymous function and then execute it straight away and all the variables inside will be scoped to the anonymous function: (function() { var myProperty = "hello world"; alert(myProperty); })(); alert(typeof(myProperty)); // undefined How does an anonymous function in JavaScript work? Building Your First jQuery Plugin A Plugin Development Pattern

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  • Google Maps Developers Live: Mapping with Style

    Google Maps Developers Live: Mapping with Style Compelling and informative map visualizations require simple, yet useful, maps... and some beautiful data. For this episode of Google Maps Developers Live, Paul Saxman discusses how he designed a few of his favorite map styles, and shares a few of his tools and techniques for designing maps for visualizations. From: GoogleDevelopers Views: 0 0 ratings Time: 30:00 More in Education

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  • BSEtunes

    BSEtunes is a MySQL based, full manageable, networkable single or multiuser jukebox application

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  • Google I/O 2012 - High Performance HTML5

    Google I/O 2012 - High Performance HTML5 For years we built web apps that far outpaced the capabilities of the browsers they ran in. Just as the browsers were catching up HTML5 came on the scene - video and audio, canvas, SVG, app cache, localStorage, @font-face, and more. Now the browsers are racing to stay ahead of the wave that's building as developers adopt these new capabilities. Is your HTML5 app going to ride the wave or be dashed on the rocks leaving users stranded? Learn which HTML5 features to seek out and which to avoid when it comes to building fast HTML5 web apps. This session will be live captioned. From: GoogleDevelopers Views: 91 1 ratings Time: 01:02:07 More in Science & Technology

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