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  • How do you make a bullet ricochet off a vertical wall?

    - by Bagofsheep
    First things first. I am using C# with XNA. My game is top-down and the player can shoot bullets. I've managed to get the bullets to ricochet correctly off horizontal walls. Yet, despite using similar methods (e.g. http://stackoverflow.com/questions/3203952/mirroring-an-angle) and reading other answered questions about this subject I have not been able to get the bullets to ricochet off a vertical wall correctly. Any method I've tried has failed and sometimes made ricocheting off a horizontal wall buggy. Here is the collision code that calls the ricochet method: //Loop through returned tile rectangles from quad tree to test for wall collision. If a collision occurs perform collision logic. for (int r = 0; r < returnObjects.Count; r++) if (Bullets[i].BoundingRectangle.Intersects(returnObjects[r])) Bullets[i].doCollision(returnObjects[r]); Now here is the code for the doCollision method. public void doCollision(Rectangle surface) { if (Ricochet) doRicochet(surface); else Trash = true; } Finally, here is the code for the doRicochet method. public void doRicochet(Rectangle surface) { if (Position.X > surface.Left && Position.X < surface.Right) { //Mirror the bullet's angle. Rotation = -1 * Rotation; //Moves the bullet in the direction of its rotation by given amount. moveFaceDirection(Sprite.Width * BulletScale.X); } else if (Position.Y > surface.Top && Position.Y < surface.Bottom) { } } Since I am only dealing with vertical and horizontal walls at the moment, the if statements simply determine if the object is colliding from the right or left, or from the top or bottom. If the object's X position is within the boundaries of the tile's X boundaries (left and right sides), it must be colliding from the top, and vice verse. As you can see, the else if statement is empty and is where the correct code needs to go.

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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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  • Google I/O 2012 - Fireside Chat with the Hangouts Team

    Google I/O 2012 - Fireside Chat with the Hangouts Team Come join a conversation with the Google+ Hangouts team. Hear the thinking behind Google's real time strategy and learn how businesses, broadcasters, developers, and families are all using the product. Ever wondered how a hangout on air works? Come to this session to get all your questions answered and learn what's in store for hangouts in the future. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 58 0 ratings Time: 01:00:01 More in Science & Technology

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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 - Bring Your App to the Big Screen

    Google I/O 2012 - Bring Your App to the Big Screen Michael Sundermeyer, Ossama Alami Google TV expands the reach of the Android and the web to television, but designing applications for the TV is fundamentally different than building apps for mobile, tablet or PCs. In this session we'll we share the core points of our user research and give you tips on how to connect with your users by designing beautiful and functional Android and web applications for the biggest screen in the house. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 617 17 ratings Time: 58:07 More in Science & Technology

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  • GDL Italy 20121107 - Unconvential webapp con GWT/Elemental, WebRCT e WebGL

    GDL Italy 20121107 - Unconvential webapp con GWT/Elemental, WebRCT e WebGL In questo video Alberto Mancini del GDG Firenze ci spiega come realizzare applicazioni web con GWT ed Elemental, capaci di acquisire il flusso video di una webcam sfruttando le nuove API WebRTC ed in grado di aggiungere effetti 3D grazie a WebGL. From: GoogleDevelopers Views: 39 3 ratings Time: 23:01 More in Science & Technology

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  • RadioButtons and Lambda Expressions

    - by MightyZot
    Radio buttons operate in groups. They are used to present mutually exclusive lists of options. Since I started programming in Windows 20 years ago, I have always been frustrated about how they are implemented. To make them operate as a group, you put your radio buttons in a group box. Conversely, to group radio buttons in HTML, you simply give them all the same name. Radio buttons with the same name or ID in HTML operate as one mutually exclusive group of options. In C#, all your radio buttons must have unique names and you use group boxes to group them. I’m in the process of converting some old code to C# and I’m tasked with creating a user control with groups of radio buttons on it. I started out writing the traditional switch…case statements to check the appropriate radio button based upon value, loops to uncheck them all, etc. Then it occurred to me that I could stick the radio buttons in a Dictionary or List and use Lambda expressions to make my code a lot more maintainable. So, here is what I ended up with: Here is a dictionary that contains my list of radio buttons and their values. I used their values as the keys, so that I can select them by value. Now, instead of using loops and switch…case statements to control the radio buttons, I use the lambda syntax and extension methods. Selecting a Radio Button by Value This code is inside of a property accessor, so “value” represents the value passed into the property accessor. The “First” extension method uses the delegate represented by the lambda expression to select the radio button (actually KeyValuePair) that represents the passed in value. Finally, the resulting checkbox is checked. Since the radio buttons are in the same group, they function as a group, the appropriate radio button is selected while the others are unselected. Reading the Value This is the get accessor for the property that returns the value of the checked radio button. Now, if you’re using binding, this code is likely not necessary; however, I didn’t want to use binding in this case, so I think this is a good alternative to the traditional loops and switch…case statements.

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  • More Than a Map - Ubilabs

    More Than a Map - Ubilabs In Hamburg, Germany we met with certified Google Maps API development partner Ubilabs. Ubilabs founders Michael Pletziger and Martin Kleppe showed us some of the Google Maps API driven projects they have built for Germany's largest brands such as Deutsche Telekom, Blitzer.de, and BMW. Read more on morethanamap.com #morethanamap From: GoogleDevelopers Views: 6 0 ratings Time: 01:48 More in Science & Technology

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  • Algorithm development in jobs

    - by dbeacham
    I have a mathematics background but also consider career in some form of software development. In particular I'm interested in finding out what sort of industries are most likely to have more algorithm development/mathematical and logical problem solving slant rather than pure application development etc. Obviously, I'm assuming that some subset of the canonical data structures and associated algorithms (trees, lists, hash tables, sets, maps with search, insert, traversals etc.) are mostly going to be present in software development. However, where am I more likely to encounter problems of more discrete maths nature (combinatorial, graph theory, sets, strings, ...) explicitly or more likely in disguise. Any pointers much appreciated (including possible open source projects that I could use for my further search for applications and also possibly contribute to).

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  • GDL Presents: Internet Freedom and the ITU

    GDL Presents: Internet Freedom and the ITU This week, the world's governments are gathering in Dubai to discuss the future of the Internet. Some governments want to use this meeting to increase censorship and regulate the Internet. Hear from one of the advocacy groups that's been leading efforts in opposition, and what threats may be around the corner in 2013. From: GoogleDevelopers Views: 0 1 ratings Time: 01:00:00 More in Science & Technology

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  • More Than a Map - Computerlogy

    More Than a Map - Computerlogy In Bangkok, Thailand we met with the co-founder of Computerlogy, Vachara Aemavat. Computerlogy is a Google Maps API development shop. Among their many great projects, they have built a great store locator for Siam Commercial Bank and a viral maps app that helps people find high ground during the Thai flood seasons. Read more on morethanamap.com #morethanamap From: GoogleDevelopers Views: 60 4 ratings Time: 02:04 More in Science & Technology

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