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• How can I solve this SAT direct corner intersection edge case?

  - by ssb

  I have a working SAT implementation, but I am running into a problem where direct collisions at a corner do not work for tiled surfaces. That is, it clips on the surface when going in a certain direction because it gets hung up on one of the tiles, and so, for example, if I walk across a floor while holding both down and left, the player will stop when meeting the next shape because the player will be colliding with the right side rather than with the top of the floor tile. This illustration shows what I mean: The top block will translate right first and then up. I have checked here and here which are helpful, but this does not address what I should do in a situation where I don't have a tile-based world. My usage of the term "tile" before isn't really accurate since what I'm doing here is manually placing square obstacles next to each other, not assigning them spots on a grid. What can I do to fix this?

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• How to solve linear recurrences involving two functions?

  - by Aditya Bahuguna

  Actually I came across a question in Dynamic Programming where we need to find the number of ways to tile a 2 X N area with tiles of given dimensions.. Here is the problem statement Now after a bit of recurrence solving I came out with these. F(n) = F(n-1) + F(n-2) + 2G(n-1), and G(n) = G(n-1) + F(n-1) I know how to solve LR model where one function is there.For large N as is the case in the above problem we can do the matrix exponentiation and achieve O(k^3log(N)) time where k is the minimum number such that for all km F(n) does not depend on F(n-k). The method of solving linear recurrence with matrix exponentiation as it is given in that blog. Now for the LR involving two functions can anyone suggest an approach feasible enough for large N.

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• HTML5 clicking objects in canvas

  - by Dave

  I have a function in my JS that gets the user's mouse click on the canvas. Now lets say I have a random shape on my canvas (really its a PNG image which is rectangular) but i don't want to include any alpha space. My issue lies with lets say i click some where and it involves a pixel of one of the images. The first issue is how do you work out the pixel location is an object on the map (and not the grass tiles behind). Secondly if i clicked said image, if each image contains its own unique information how do you process the click to load the correct data. Note I don't use libraries I personally prefer the raw method. Relying on libraries doesn't teach me much I find.

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• Can WebGL be used to create a tile-based multi-layer scrolling platform game?

  - by Nicholas Hill

  I've found WebGL (based on OpenGL) to be a fiendish and unforgiving framework for those learning to write HTML5-based games. Despite the presence of many examples on how to get started, I'm really struggling to understand how I could simply load a bunch of images and render them to a canvas quickly using WebGL. My specific scenario involves trying to render a map using a bespoke but simple multi-layered tile engine, where each value in a three dimensional array points to the image to use for that location in the rendered image. Think "Sonic the Hedgehog" via tilesets, tiles, maps, layers, sprites etc. Can anyone enlighten me: 1) How can I load an image that I can use as a texture in WebGL? 2) How can I dynamically select an image at run time and draw it at any co-ordinate, that I also select at run time?

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• Updating "Inactive" Chunks

  - by Conner Bryan

  In my game, the only chunks (4x4 areas of tiles) in memory are the ones that the player is in. However, chunks need to have updates applied to them over time. A (likely) well-known example would be MineCraft: even if the player isn't in a chunk, the wheat still needs to grow over time. My current solution is to call a method and pass in the time since the chunk was active.. but what if the chunk depends on nearby chunks for information, i.e. vines spreading or similar? Is there any reasonable solutions to this problem, or should I simply not depend on nearby chunks?

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• How would i rank my keywords in Yahoo search engine?

  - by user1430715

  I am working as search engine optimizer team lead in a company and facing problem in a project which name is http://www.Prooftech.com.sg... Problem :- The Website has 10 keywords for which my client wanted the top 10 Ranking in Yahoo Singapore search engine. I have got top 10 ranking for the following 7 keywords Waterproofing, RC Roof ,Wall Leakages ,Ceiling Leakages , Water Leakages ,Roof Tile Coating ,Roof Tiles Repair in my 3 months work but still i am not getting the listing positions for Roof ,Concrete Repair ,Grouting .... I have Done lot of Bookmarking ,Blog Commenting ,Blog Creations ,Press Release,Classified Ads to get these 3 keywords in listing but there is no changes in the results.... Can any help me out from this problem so i can get Good rankings for Roof ,Concrete Repair ,Grouting

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• Will my game engine be compatible with physics engines?

  - by Bane

  My engine supports Scene handling, Cameras, and has a Renderer. Also, it has a class called Drawable, which has the position, the shape and the picture of an object. The picture property has width, height, rotation and a draw method. All game objects are supposed to inherit from this Drawable class, and are added to the Scene, along with a Map (collection of Tiles, that also inherit from Drawable), lights, and so on and so forth. The shape property of a Drawable is a Polygon, a collection of user defined vertices around the position of a Drawable (this is a relative coordinate system, so [0, 0] is the position of the Drawable. With this setup, will the users of my engine (probably only me) still be able to intergrate physics engines such as Box2DJS into their games?

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• How to handle a Tile Map Scrolling [duplicate]

  - by DGomez

  This question already has an answer here: Implementing a camera / viewport to a 2D game 1 answer i'm making a video game, and i'm having, i think, a concept problem. The game will be a platformer which will use tile maps, so to start i will create a mask matrix indicating the tiles to be loaded, and etc..., so my problem is, how to handle the scrolling? should i create a giant mask matrix indicating in each position of the whole level what is supposed to be loaded, and according to the position of the player, change the section to be drawed?? Is this a correct approach to this situation??

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• Drawing Transparency in XNA 4.0

  - by dpaz

  Using C# (VS2010) with XNA 4.0, I have a terrain layer (RenderTarget2D) in a 2D side-scroller. My visual system tracks updates to redraw individual tiles, but I am having trouble finding a way to clear out the rectangle where the tile will be drawn, which I must do because A) there may no longer be a tile or B) the tile may itself contain transparency. How can I draw a rectangle of transparency onto an existing RenderTarget2D? I essentially want to clear just that rectangular portion of it. My Google searches have not yielded anything relevant.

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• Collision Detection within Player/Enemy Class

  - by user1264811

  I'm making a 2D platform game. Right now I'm just working on making a very generic Player class. I'm wondering if it would be more efficient/better practice to have an ActionListener within the Player class to detect collisions with Enemy objects (also have an ActionListener) or to handle all the collisions in the main world. Furthermore, I'm thinking ahead about how I will handle collisions with the platforms themselves. I've looked into the double boolean arrays to see which tiles players can go to and which they can't. I don't understand how to use this class and the player class at the same time. Thank you.

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• Browser game in JSP? [closed]

  - by Constant

  I want to develop a browser-game (like ogame, travian) and I have some doubts in which technologies should I use. I was thinking in a server-side in JSP,Java and a client-side in HTML (or HTML5 if I learn to give it good use). Do you think my choices are right? I would like to make a board where many players could move simultaneously between tiles or squares. Do you think is possible in JSP or I should start with other language? Any suggestion aprecciated, and apologies for my english. Thank you! Regards!

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• What do you use to create sprite graphics? [closed]

  - by SimpleRookie

  Possible Duplicate: What tools do you use for 2D art/sprite creation? What do you folks suggest for creating sprite graphics and sprite sheets? I fiddle with pixelformer and tilestudio. Pixelfromer has a kicken interface, it is quick and easy to make graphics, but a bit cumbersom if you want to make a spritemap. Tile Studio is a interesting mix or tiles and maps, but it is a bit buggy and basic. The Adobe series, just don't really seem to handle tiny graphics well. (there is a previous posting of this question existing, but it is a year old and I was hoping for further/updated input from the community)

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• melonJS: Entity and solid block on collision layer

  - by Arthur Halma

  Actually I have my player entity with 64x64 sprite animation and 18x60 hitbox also the map is maded by 16x16 tiles. When my player goes some way he can pass through blocks (but not all of them). For example there are 4 situations: Good (player can't pass the tile with isSolid property on collision layer) Good (player can't pass the tile with isSolid property on collision layer) Bad (player pass the tile with isSolid property on collision layer) Bad (player pass the tile with isSolid property on collision layer) Looks like melonJS checks only corners of hitbox instead of whole rectangle. Can anyone help me in this situation.

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• Should my game handle collisions in the Player object?

  - by user1264811

  I'm making a 2D platform game. Right now I'm just working on making a very generic Player class. I'm wondering if it would be more efficient/better practice to have an ActionListener within the Player class to detect collisions with Enemy objects (also have an ActionListener) or to handle all the collisions in the main world. Furthermore, I'm thinking ahead about how I will handle collisions with the platforms themselves. I've looked into the double boolean arrays to see which tiles players can go to and which they can't. I don't understand how to use this class and the player class at the same time.

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• Fixing LOD gaps, T-junctions

  - by Jaka Jancar

  I'm creating a heightmap renderer. One of the examples for solving gaps when doing LOD I found is this: (from Game Programming Gems 2 - Greg Snook - Simplified Terrain using Interlocking Tiles) Wouldn't this still produce a gap, if the three vertices encircled with red were not co-linear? Shouldn't the middle triangle be split into two, as I marked with the orange line? Am I misunderstanding the problem, or is there a mistake in the example?

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• Spring MVC and JSP framework

  - by bmw0128

  What is a very good jsp framework to use with Spring MVC. Are the only candidates SiteMesh and Tiles, and others?

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• Problem with JSON, Struts 2 and Ajax.

  - by Javi

  Hello, I have an apllication with Struts 2, Spring and I want to send JSON as a response to an Ajax request, but my server in not sending the JSON in the response. I have this base package: <package name="myApp-default" extends="struts-default"> <result-types> <result-type name="tiles" class="org.apache.struts2.views.tiles.TilesResult" /> <result-type name="json" class="com.googlecode.jsonplugin.JSONResult"> <param name="enableGZIP">true</param> <param name="noCache">true</param> <param name="defaultEncoding">ISO-8859-1</param> </result-type> </result-types> </package> And another package which extends the previous one. <package namespace="/rest" name="rest" extends="myApp-default"> <action name="login" class="restAction" method="login"> <result type="json"/> </action> So I call with jQuery Ajax and debugging it I see it enters in the Action restAction in the method login and it also enters in the method getJsonData() because I have set two breakpoints and the program is stopped first in login and then in getJsonData. public class RestAction extends BaseAction { private String login; private String password; private String jsonData; public String login() { jsonData = "changed"; return Action.SUCCESS; } //I ommit getter/setters for login and password @JSON(name="jsonData") public String getJsonData() { return jsonData; } public void setJsonData(String jsonData) { this.jsonData = jsonData; } } My ajax looks like this: $.ajax({type: 'GET', url: this_url, data: pars, cache:false, success: handleResponse, error: handleError}); With firebug I see that the response to my request is completely void (though I have seen that the data saved in pars variable has been populated to the action and the methods have been executed correctly). And maybe for that reason my ajax enters in my handleError function where xmlHttpRequest.readyState is 4 and xmlHttpRequest.status is 0. Can anyone tell me what may the problem be? Thanks.

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• Caching web API proxy?

  - by Jeremy Dunck

  I was wondering if anyone knows of a caching proxy specifically for dealing with API responses? Ideally, I'd be able to declare what caching policy to use for different API semantics, e.g. cache album art for 1 day, cache favorite tweets for 5 minutes, cache map tiles forever, except invalidate when this other API is called. I know about using Apache, Squid, etc for caching in general -- I'm just hoping for something with nicer usage semantics by restricting the design goal to dealing with APIs rather than the web in general.

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• How do I resize a Google Map with JavaScript after it has loaded?

  - by Matthew James Taylor

  I have a 'mapwrap' div set to 400px x 400px and inside that I have a Google 'map' set to 100% x 100%. So the map loads at 400 x 400px, then with JavaScript I resize the 'mapwrap' to 100% x 100% of the screen - the google map resizes to the whole screen as I expected but tiles start disappearing before the right hand edge of the page. Is there a simple function I can call to cause the Google map to re-adjust to the larger size 'mapwrap' div?

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• Friction in Box2d

  - by Rosarch

  I am using Box2d for a topdown game. The "ground" is a series of tiles, where each tile is a static body with a sensor shape. Can I make friction take effect for this, even though the objects aren't really "colliding" with the ground? If Box2d won't let me do this, I considered trying to implement my own by detecting what force is currently moving the object, and applying a force opposite to it, but I'm not quite sure how to detect that force.

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• slicing up a very big jpg map image , 49000* 34300 pixel

  - by sirvan

  hi i want to write a mapviewer, i must to work small tile of big map image file and there is need to tiling the big image, the problem now is to tiling big image to small tiles (250 * 250 pixel or like this size) so on, i used ImageMagic program to do it but there was problem now is any other programing method or application that do tiling? can i do it with JAI in java? how?

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• slicing up a very big jpg map image , 140000*125000 pixel

  - by sirvan

  hi i want to write a mapviewer, i must to work small tile of big map image file and there is need to tiling the big image, the problem now is to tiling big image to small tiles (250 * 250 pixel or like this size) so on, i used ImageMagic program to do it but there was problem now is any other programing method or application that do tiling? can i do it with JAI in java? how?

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• No bean named 'springSecurityFilterChain' is defined

  - by michaeljackson4ever

  When configs are loaded, I get the error SEVERE: Exception starting filter springSecurityFilterChain org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'springSecurityFilterChain' is defined My sec-config: <http use-expressions="true" access-denied-page="/error/casfailed.html" entry-point-ref="headerAuthenticationEntryPoint"> <intercept-url pattern="/" access="permitAll"/> <!-- <intercept-url pattern="/index.html" access="permitAll"/> --> <intercept-url pattern="/index.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/history.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/absence.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/search.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/employees.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/employee.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/contract.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/myforms.html" access="hasAnyRole('HLO','OPISK')"/> <intercept-url pattern="/vacationmsg.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/redirect.jsp" filters="none" /> <intercept-url pattern="/error/**" filters="none" /> <intercept-url pattern="/layout/**" filters="none" /> <intercept-url pattern="/js/**" filters="none" /> <intercept-url pattern="/**" access="isAuthenticated()" /> <!-- session-management invalid-session-url="/absence.html"/ --> <!-- logout logout-success-url="/logout.html"/ --> <custom-filter ref="ssoHeaderAuthenticationFilter" before="CAS_FILTER"/> <!-- CAS_FILTER ??? --> </http> <authentication-manager alias="authenticationManager"> <authentication-provider ref="doNothingAuthenticationProvider"/> </authentication-manager> <beans:bean id="doNothingAuthenticationProvider" class="com.nixu.security.sso.web.DoNothingAuthenticationProvider"/> <beans:bean id="ssoHeaderAuthenticationFilter" class="com.nixu.security.sso.web.HeaderAuthenticationFilter"> <beans:property name="groups"> <beans:map> <beans:entry key="cn=lake,ou=confluence,dc=utu,dc=fi" value="ROLE_ADMIN"/> </beans:map> </beans:property> </beans:bean> <beans:bean id="headerAuthenticationEntryPoint" class="com.nixu.security.sso.web.HeaderAuthenticationEntryPoint"/> And web.xml <context-param> <param-name>contextConfigLocation</param-name> <param-value> /WEB-INF/applicationContext.xml /WEB-INF/sec-config.xml /WEB-INF/idm-config.xml /WEB-INF/ldap-config.xml </param-value> </context-param> <display-name>KeyCard</display-name> <context-param> <param-name>webAppRootKey</param-name> <param-value>KeyCardAppRoot</param-value> </context-param> <context-param> <param-name>log4jConfigLocation</param-name> <param-value>/WEB-INF/log4j.properties</param-value> </context-param> <!-- Reads request input using UTF-8 encoding --> <filter> <filter-name>characterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter> <filter-name>springSecurityFilterChain</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> </filter> <filter-mapping> <filter-name>characterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <filter-mapping> <filter-name>springSecurityFilterChain</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <listener> <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class> </listener> <listener> <!-- this is for session scoped objects --> <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class> </listener> <listener> <listener-class>org.springframework.security.web.session.HttpSessionEventPublisher</listener-class> </listener> <!-- Handles all requests into the application --> <servlet> <servlet-name>KeyCard</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet> <servlet-name>tiles</servlet-name> <servlet-class>org.apache.tiles.web.startup.TilesServlet</servlet-class> <init-param> <param-name> org.apache.tiles.impl.BasicTilesContainer.DEFINITIONS_CONFIG </param-name> <param-value> /WEB-INF/tilesViewContext.xml </param-value> </init-param> <load-on-startup>2</load-on-startup> </servlet> <servlet-mapping> <servlet-name>KeyCard</servlet-name> <url-pattern>*.html</url-pattern> </servlet-mapping> <session-config> <session-timeout> 120 </session-timeout> </session-config> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <!-- error-page> <exception-type>java.lang.Exception</exception-type> <location>/WEB-INF/error/error.jsp</location> </error-page --> </web-app> What's wrong?

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• Generate random platforms without intersection

  - by DMan

  How would I go about generating random platforms without intersection? I think garbage collection and maybe all that checking may be an issue. I've got the generating tiles part down, but not the intersection checking.

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• How do I add values to semi-complex JSON object?

  - by Nick Verheijen

  I'm fairly new to using JSON objects and I'm kinda stuck. I've got an JSON object that was converted from this array: Array ( [status] => success [id] => 1 [name] => Zone 1 [description] => Awesome zone deze.. [tiles] => Array ( // Column for the tile grid [0] => Array ( // Row for the tile grid [0] => Array ( [tileID] => 1 [rotation] => 0 ) [1] => Array ( [tileID] => 1 [rotation] => 0 ) // Etc.. ) [1] => Array // etc.. etc.. ) ) I use this object to render out an isometric grid for my HTML5 Canvas game. I'm building a map editor and to put more tiles on the map, i'll have to add values to this json object. This is how I would do it in PHP: mapData[column][row] = array( 'tileID' => 1, 'rotation' => 0 ); So my question is, how do I achieve this with a JSON object in javascript? Thanks in advance! Nick Update I've ran into an error: can't convert undefined to object mapDataTiles[mouseY][mouseX] = { tileID: editorSelectedTile, rotation: 0 }; This is the code i use for clicking & then saving the new tile to the JSON object. At first I though that one of my parameters was 'undefined', so i logged those to the console but they came out perfectly.. // If there is already a tile placed on these coordinates if( mapDataTiles[mouseX] && mapDataTiles[mouseX][mouseY] ) { mapDataTiles[mouseX][mouseY]['tileID'] = editorSelectedTile; } // If there is no tile placed on these coordinates else { mapDataTiles[mouseX][mouseY] = { tileID: editorSelectedTile, rotation: 0 }; } My variables have the following values: MouseX: 5 MouseY: 17 tileID: 2 Also weird fact, that for some coordinates it does actually work and save new data to the array. mapDataTiles[mouseY][mouseX] = { tileID: editorSelectedTile, rotation: 0 };

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