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• Generic and type safe I/O model in any language

  - by Eduardo León

  I am looking for an I/O model, in any programming language, that is generic and type safe. By genericity, I mean there should not be separate functions for performing the same operations on different devices (read_file, read_socket, read_terminal). Instead, a single read operation works on all read-able devices, a single write operation works on all write-able devices, and so on. By type safety, I mean operations that do not make sense should not even be expressible in first place. Using the read operation on a non-read-able device ought to cause a type error at compile time, similarly for using the write operation on a non-write-able device, and so on. Is there any generic and type safe I/O model?

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• "Serious errors found HF checking the drive for /home" After Moving /home to external HFSplus partition

  - by Arctic Shadow

  I just installed Mac OS X 10.7 "Lion" and Ubuntu 11.10 on my MacBook Pro. Using these instructions: tuxation.com/creating-home-partition-mac-linux.html . After changing the location of my home folder to the new location, it gives me the error in the title, and my username no longer appears in the login screen. Using the "Other" option with my username seems to make it try to log in, but the screen quickly flashes between blank and a shell before kicking me back to the login screen without notice. I'm trying to share my home folder between Mac OS X and Ubuntu, using an hfsplus partition (unjournaled) between the two. The home partition seems to mount fine as /home, and I am able to modify it under Ubuntu. Below is the line I've added to fstab: /dev/sda3 /home hfsplus defaults 0 1 I should also note that I changed my account's username and home directory location to match this, though I've double checked that and everything seems in order there... Thank you in advance for any assistance. Edit: It seems that the /etc/passwd file didn't have my new home directory's location in it, so I changed that, and I am now able to log into my account, although I am still not listed in the login screen, and my username in the menu on the top right shows up as "[Invalid UTF-8]"...

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• checking for collision detection

  - by bill

  I am trying to create a game where you have a player and you can move right,left, and jump. kind of like mario but its not a side scroller. also i want to use 2d array to make a tile map. my big problem is that i dont understand how to check for collision. i spend about 2 week thinking about this and i came up with 2 solution but they both have problems. let say my map is: 0 = sky 1 = player 2 = ground 00000 10002 22022 Solution 1: move the '1'(player) and update the map less say player wants to move right, then x+=grid[x+1][y] this make the collision easy bc you can just check if if(grid[x][y+1] == 2){ //player is standing on top of ground } problem with this when u hit right key player will move (x*Titlewidth) to right. and as you can see the animation wont look smooth. Solution 2: move player and dont update map player_x += 2 this will make the animation more smoother bc i am just moving 2 pixels. problem1: i cant update map bc if player some times will be middle of int(2d array). but thats ok sinces its not a side scroller so updating the map is not a big deal. problem2: only way to check for collision is to use java intersection method. but then player have to be atleast 1 or 2 pixel in ground in order to check for collision. and as you can see that wont look good too. plz note this is my first collision game in java. so plz try to explain alot otherwise i wont understand it.

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• SharePoint Content Type Cheat Sheet

  - by Bil Simser

  PrincipleAny application or solution built in SharePoint must use a custom content type over adding columns to lists. The only exception to this is one-off solutions that have no life-cycle, proof-of-concepts, etc.Creating Content TypesWeb UI. Not portable, POC onlyC# or Declarative (XML). Must deploy these as FeaturesRuleDo not chagne the base XML for a Content Type after deploying. The only exception to this rule is that you can re-deploy a modified Content Type definition only after completely removing it from the environment (either programatically or by hand).Updating Content TypesUpdate and push down to child typesWeb UI. Manual for each environment. Document steps required for repeatability.Feature Upgrade. Preferred solution.C#. If you created the content type through code you might want to go this route. Create new modified Content Types and hide the old one. Not recommended but useful for legacy.ReferencesCreate Custom Content  Types in SharePoint 2010 (C#)Content Type Definitions  (XML)Creating Content Types (XML  and C#)Updating ApproachesUpdating Child Content TypesAgree or disagree?

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• MVP Pattern Philsophical Question - Security Checking in UI

  - by Brian

  Hello, I have a philosophical question about the MVP pattern: I have a component that checks whether a user has access to a certain privilege. This privilege turns on or off certain UI features. For instance, suppose you have a UI grid, and for each row that gets bound, I do a security check to see if certain features in the grid should be enabled or disabled. There are two ways to do this: have the UI/view call the component's method, determine if it has access, and enable/disable or show/hide. The other is have the view fire an event to the presenter, have the presenter do the check and return the access back down to the view through the model or through the event arg. As per the MVP pattern, which component should security checks fit into, the presenter or the view? Since the view is using it to determine its accessibility, it seems more fitting in the view, but it is doing database checks and all inside this business component, and there is business logic there, so I can see the reverse argument too. Thoughts? Thanks.

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• Checking is sides of cubes are solid

  - by Christian Frantz

  In relation to this question: http://gamedev.stackexchange.com/a/28524/31664 And a question I asked earlier: Creating a DrawableGameComponent And also because my internet is too slow to get on chat. I'm wondering how to check if the sides of a cube are solid. I've created 12 methods, each one creating indices and vertices for sides of a cube. Now when I use these methods, the cube creates how it should. All 6 sides show up and its like I didnt change a thing. How can use if statements to check if the side of a cube is solid? The pseudocode from the question above shows this: if(!isSolidAt(x+1,y,z)) verticesToDraw += AddXPlusFace(x,y,z) But in my case is would be: if(!sideIsSolid) SetUpFrontFaceIndices(); My method simply takes these index and vertex values and adds them to a list indicesToDraw and verticesToDraw, as shown in the answer above

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• Checking whether php script was resolved by optimal way

  - by user2135931

  Can anybody give some advise how to check the arbitrary php code on optimal solution. For example I create a simple algorithm and sent it on the special resource. After proccessing my algorithm this resource give me result whether my code is nice. If no it give me some advice and tell what is wrong (maybe I forgot check devision by zero etc). I looked for php code analyzer but could't find any variants. Maybe someone give me a resource where I can research this problem. Thanks in advance!

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• SharePoint 2010 Hosting :: How to Create an External Content Type SharePoint 2010

  - by mbridge

  In this simple Article trying to show how SharePoint Designer 2010 more the External Content Type to External Database are very easy to create and can be integrated with our SharePoint Portals. You can download SharePoint Designer 2010 here: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=d88a1505-849b-4587-b854-a7054ee28d66&displaylang=en For this Example I will create a Database in SQL Server and will use SharePoint Designer 2010 to create the connections and use as a mirror from our SharePoint Portal using List and the Database. The first thing we need to do, is connect to SQL Server and create our Database call “Contacts” and add the Table “Contact” with the following fields.  When we create the External Content Type. We  will need to associate the Content Type, in this case i am using the Generic List, then we can create the Connection to the external Data Source. After create the Connection to the Database we can define what Columns we will use and what operations we will add our custom List. For this example i select all Operation they came default. This operation are very important because the Business rules are defined in each operation. After we create the diferent operations we can create the Custom List and define the how will be the Operation and add the Name for our custom List.  If you try to access the New Custom List Call “Custom Contact” you will see we will not have access to the Business Data Connectivity. To Resolve this issue we will need to give Access and permissions to users to the Custom External Content Type BDC connection in the Central administration.  Access to Central Administration Page and select the option “Service Application Tab> Manage Service Application”. There you select the Service “Business Data Connectivity Service” then select “Manage”.  This Option will list all External Content Type, choose the External Content Type we create and select the option “Set Object Permission”, this option will allow to add users to the BDC and manage the permissions to the Custom List.  After the correct permissions are given we can Access to Data on our custom Contact List and start creating new Item and all the other options and operation we define to the same List.  Hope you like this litle Article about connect Database Content to SharePoint Portal using the Externa Content Types and BCS.Thank you.

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• Is committing/checking code everyday a good practice?

  - by ArtB

  I've been reading Martin Fowler's note on Continuous Integration and he lists as a must "Everyone Commits To the Mainline Every Day". I do not like to commit code unless the section I'm working on is complete and that in practice I commit my code every three days: one day to investigate/reproduce the task and make some preliminary changes, a second day to complete the changes, and a third day to write the tests and clean it up^ for submission. I would not feel comfortable submitting the code sooner. Now, I pull changes from the repository and integrate them locally usually twice a day, but I do not commit that often unless I can carve out a smaller piece of work. Question: is committing everyday such a good practice that I should change my workflow to accomodate it, or it is not that advisable? ^ The order is more arbitrary and depends on the task, my point was to illustrate the time span and activities, not the exact sequence.

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• Unicorn installation error on Debian 5

  - by Luc

  I am running ruby1.9 on Debian 5, and did not manage to install 'unicorn' with rubygems. I got this error and do not really know how to solve it. Do you have any idea of the possible root cause ? > gem install unicorn Building native extensions. This could take a while... ERROR: Error installing unicorn: ERROR: Failed to build gem native extension. /usr/bin/ruby1.9 extconf.rb checking for CLOCK_MONOTONIC in time.h... yes checking for clockid_t in time.h... yes checking for clock_gettime() in -lrt... yes checking for t_open() in -lnsl... no checking for socket() in -lsocket... no checking for poll() in poll.h... yes checking for getaddrinfo() in sys/types.h,sys/socket.h,netdb.h... yes checking for getnameinfo() in sys/types.h,sys/socket.h,netdb.h... yes checking for struct sockaddr_storage in sys/types.h,sys/socket.h... yes checking for accept4() in sys/socket.h... no checking for sys/select.h... yes checking for ruby/io.h... yes checking for rb_io_t.fd in ruby.h,ruby/io.h... yes checking for rb_io_t.mode in ruby.h,ruby/io.h... yes checking for rb_io_t.pathv in ruby.h,ruby/io.h... no checking for struct RFile in ruby.h,ruby/io.h... yes checking size of struct RFile in ruby.h,ruby/io.h... 24 checking for struct RObject... no checking size of int... 4 checking for rb_io_ascii8bit_binmode()... no checking for rb_thread_blocking_region()... yes checking for rb_thread_io_blocking_region()... no checking for rb_str_set_len()... yes checking for rb_time_interval()... yes checking for rb_wait_for_single_fd()... no creating Makefile make cc -I. -I/usr/include/ruby-1.9.0/x86_64-linux -I/usr/include/ruby-1.9.0 -I. -DHAVE_TYPE_CLOCKID_T -DHAVE_POLL -DHAVE_GETADDRINFO -DHAVE_GETNAMEINFO -DHAVE_TYPE_STRUCT_SOCKADDR_STORAGE -DHAVE_SYS_SELECT_H -DHAVE_RUBY_IO_H -DHAVE_RB_IO_T_FD -DHAVE_ST_FD -DHAVE_RB_IO_T_MODE -DHAVE_ST_MODE -DHAVE_TYPE_STRUCT_RFILE -DSIZEOF_STRUCT_RFILE=24 -DSIZEOF_INT=4 -DHAVE_RB_THREAD_BLOCKING_REGION -DHAVE_RB_STR_SET_LEN -DHAVE_RB_TIME_INTERVAL -D_GNU_SOURCE -DPOSIX_C_SOURCE=1-D_POSIX_C_SOURCE=200112L -fPIC -fno-strict-aliasing -g -g -O2 -O2 -g -Wall -Wno-parentheses -fPIC -o kgio_ext.o -c kgio_ext.c cc -I. -I/usr/include/ruby-1.9.0/x86_64-linux -I/usr/include/ruby-1.9.0 -I. -DHAVE_TYPE_CLOCKID_T -DHAVE_POLL -DHAVE_GETADDRINFO -DHAVE_GETNAMEINFO -DHAVE_TYPE_STRUCT_SOCKADDR_STORAGE -DHAVE_SYS_SELECT_H -DHAVE_RUBY_IO_H -DHAVE_RB_IO_T_FD -DHAVE_ST_FD -DHAVE_RB_IO_T_MODE -DHAVE_ST_MODE -DHAVE_TYPE_STRUCT_RFILE -DSIZEOF_STRUCT_RFILE=24 -DSIZEOF_INT=4 -DHAVE_RB_THREAD_BLOCKING_REGION -DHAVE_RB_STR_SET_LEN -DHAVE_RB_TIME_INTERVAL -D_GNU_SOURCE -DPOSIX_C_SOURCE=1-D_POSIX_C_SOURCE=200112L -fPIC -fno-strict-aliasing -g -g -O2 -O2 -g -Wall -Wno-parentheses -fPIC -o autopush.o -c autopush.c cc -I. -I/usr/include/ruby-1.9.0/x86_64-linux -I/usr/include/ruby-1.9.0 -I. -DHAVE_TYPE_CLOCKID_T -DHAVE_POLL -DHAVE_GETADDRINFO -DHAVE_GETNAMEINFO -DHAVE_TYPE_STRUCT_SOCKADDR_STORAGE -DHAVE_SYS_SELECT_H -DHAVE_RUBY_IO_H -DHAVE_RB_IO_T_FD -DHAVE_ST_FD -DHAVE_RB_IO_T_MODE -DHAVE_ST_MODE -DHAVE_TYPE_STRUCT_RFILE -DSIZEOF_STRUCT_RFILE=24 -DSIZEOF_INT=4 -DHAVE_RB_THREAD_BLOCKING_REGION -DHAVE_RB_STR_SET_LEN -DHAVE_RB_TIME_INTERVAL -D_GNU_SOURCE -DPOSIX_C_SOURCE=1-D_POSIX_C_SOURCE=200112L -fPIC -fno-strict-aliasing -g -g -O2 -O2 -g -Wall -Wno-parentheses -fPIC -o wait.o -c wait.c cc -I. -I/usr/include/ruby-1.9.0/x86_64-linux -I/usr/include/ruby-1.9.0 -I. -DHAVE_TYPE_CLOCKID_T -DHAVE_POLL -DHAVE_GETADDRINFO -DHAVE_GETNAMEINFO -DHAVE_TYPE_STRUCT_SOCKADDR_STORAGE -DHAVE_SYS_SELECT_H -DHAVE_RUBY_IO_H -DHAVE_RB_IO_T_FD -DHAVE_ST_FD -DHAVE_RB_IO_T_MODE -DHAVE_ST_MODE -DHAVE_TYPE_STRUCT_RFILE -DSIZEOF_STRUCT_RFILE=24 -DSIZEOF_INT=4 -DHAVE_RB_THREAD_BLOCKING_REGION -DHAVE_RB_STR_SET_LEN -DHAVE_RB_TIME_INTERVAL -D_GNU_SOURCE -DPOSIX_C_SOURCE=1-D_POSIX_C_SOURCE=200112L -fPIC -fno-strict-aliasing -g -g -O2 -O2 -g -Wall -Wno-parentheses -fPIC -o connect.o -c connect.c cc -I. -I/usr/include/ruby-1.9.0/x86_64-linux -I/usr/include/ruby-1.9.0 -I. -DHAVE_TYPE_CLOCKID_T -DHAVE_POLL -DHAVE_GETADDRINFO -DHAVE_GETNAMEINFO -DHAVE_TYPE_STRUCT_SOCKADDR_STORAGE -DHAVE_SYS_SELECT_H -DHAVE_RUBY_IO_H -DHAVE_RB_IO_T_FD -DHAVE_ST_FD -DHAVE_RB_IO_T_MODE -DHAVE_ST_MODE -DHAVE_TYPE_STRUCT_RFILE -DSIZEOF_STRUCT_RFILE=24 -DSIZEOF_INT=4 -DHAVE_RB_THREAD_BLOCKING_REGION -DHAVE_RB_STR_SET_LEN -DHAVE_RB_TIME_INTERVAL -D_GNU_SOURCE -DPOSIX_C_SOURCE=1-D_POSIX_C_SOURCE=200112L -fPIC -fno-strict-aliasing -g -g -O2 -O2 -g -Wall -Wno-parentheses -fPIC -o poll.o -c poll.c poll.c:11:18: error: st.h: No such file or directory poll.c: In function 'do_poll': poll.c:148: error: 'RUBY_UBF_IO' undeclared (first use in this function) poll.c:148: error: (Each undeclared identifier is reported only once poll.c:148: error: for each function it appears in.) make: *** [poll.o] Error 1 Gem files will remain installed in /usr/lib/ruby/gems/1.9.0/gems/kgio-2.5.0 for inspection. Results logged to /usr/lib/ruby/gems/1.9.0/gems/kgio-2.5.0/ext/kgio/gem_make.out

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• Circle to Circle collision, checking each circle against all others

  - by user14861

  I'm currently coding a little circle to circle collision demo but I've got a little stuck. I think I currently have the code to detect collision but I'm not sure how to loop through my list of circles and check them off against one another. Collision check code: public static Vector2 GetIntersectionDepth(Circle a, Circle b) { float xValue = a.Center.X - b.Center.X; float yValue = a.Center.Y - b.Center.Y; Vector2 depth = Vector2.Zero; float distance = Vector2.Distance(a.Center, b.Center); if (a.Radius + b.Radius > distance) { float result = (a.Radius + b.Radius) - distance; depth.X = (float)Math.Cos(result); depth.Y = (float)Math.Sin(result); } return depth; } Loop through code: Vector2 depth = Vector2.Zero; for (int i = 0; i < bounds.Count; i++) for (int j = i+1; j < bounds.Count; j++) { depth = CircleToCircleIntersection.GetIntersectionDepth(bounds[i], bounds[j]); } Clearly I'm a complete newbie, wondering if anyone can give any suggestions or point out my errors, thanks in advance. :)

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• statistics for checking imported data?

  - by user1936

  I'm working on a data migration of several hundred nodes from a Drupal 6 to a Drupal 7 site. I've got the data exported to the new site and I want to check it. Harkening back to my statistics classes, I recall that there is some way to figure out a random number of nodes to check to give me some percentage of confidence that the whole process was correct. Can anyone enlighten me as to this practical application of statistics? For any given number of units, how big must the sample be to have a given confidence interval?

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• Checking for alternate keys with XNA IsKeyDown

  - by jocull

  I'm working on picking up XNA and this was a confusing point for me. KeyboardState keyState = Keyboard.GetState(); if (keyState.IsKeyDown(Keys.Left) || keyState.IsKeyDown(Keys.A)) { //Do stuff... } The book I'm using (Learning XNA 4.0, O'Rielly) says that this method accepts a bitwise OR series of keys, which I think should look like this... KeyboardState keyState = Keyboard.GetState(); if (keyState.IsKeyDown(Keys.Left | Keys.A)) { //Do stuff... } But I can't get it work. I also tried using !IsKeyUp(... | ...) as it said that all keys had to be down for it to be true, but had no luck with that either. Ideas? Thanks.

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• Checking preconditions or not

  - by Robert Dailey

  I've been wanting to find a solid answer to the question of whether or not to have runtime checks to validate input for the purposes of ensuring a client has stuck to their end of the agreement in design by contract. For example, consider a simple class constructor: class Foo { public: Foo( BarHandle bar ) { FooHandle handle = GetFooHandle( bar ); if( handle == NULL ) { throw std::exception( "invalid FooHandle" ); } } }; I would argue in this case that a user should not attempt to construct a Foo without a valid BarHandle. It doesn't seem right to verify that bar is valid inside of Foo's constructor. If I simply document that Foo's constructor requires a valid BarHandle, isn't that enough? Is this a proper way to enforce my precondition in design by contract? So far, everything I've read has mixed opinions on this. It seems like 50% of people would say to verify that bar is valid, the other 50% would say that I shouldn't do it, for example consider a case where the user verifies their BarHandle is correct, but a second (and unnecessary) check is also being done inside of Foo's constructor.

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• Checking update reason after actual update

  - by KaRo

  Is there a possibility to find out the reason for at least the last automatic update? When the update-window pops up one can click on the entries and find a statement about what bug shall be fixed with a certain package, or more general why it is updated at all. I want to check for this information afterwards to check if a certain bug or functionality is claimed to be fixed already. thx - robert.

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• SQL Server and the XML Data Type : Data Manipulation

  The introduction of the xml data type, with its own set of methods for processing xml data, made it possible for SQL Server developers to create columns and variables of the type xml. Deanna Dicken examines the modify() method, which provides for data manipulation of the XML data stored in the xml data type via XML DML statements.

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• Checking for DBNull

  - by Jim Lahman

  Using a table adapter to a SQL Server database table that returns a NULL record.  We determine the fields are NULL by comparing against System.DBNull Looking the NULL records in SQL Management studio   Using a table adapter to retrieve a record   1: try 2: { 3: this.vTrackingTableAdapter.FillByTrkZone(this.dsL1Write.vTracking, iTrkZone); 4: } 5: catch (Exception ex) 6: { 7: sLogMessage = String 8: .Format("Error getting coil number from tracking table at {0} - {1}", 9: sTrkName, 10: ex.Message); 11: throw new CannotReadTrackingTableException(sLogMessage); 12: }   Looking at the record as it returned from the table adapter:   ItemArrayObject Column [0] ChargeCoilNumber [1] HeadWeldZone [2] TailWeldZone [3] ZoneLen [4] ZoneCoilLen [5] Confirmed [6] Validated [7] EntryWidth [8] EntryThickness   Since each item in the ItemArray is an object, we can test for null   1: if (dsL1Write.vTracking.Rows[0].ItemArray[0] == System.DBNull.Value) 2: { 3: throw new NoCoilAtPORException("NULL coil found at tracking zone " + sTrkName); 4: }   If no records were returned by the table adapter 1: if (dsL1Write.vTracking.Rows.Count == 0) 2: { 3: throw new NoCoilAtPORException("No coils found at tracking zone " + sTrkName); 4: }

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• Paranoid management, contractor checking work [closed]

  - by user833345

  Just wanted to get some opinions and experiences on an issue I'm having at work. First, a little background. I've been working at a company for some time (past any probation periods) and rewriting a horrendous system. No tests, incomplete and broken functionality everywhere, enough copypasta to feed a small village, redundant code, more unused SQL tables than used ones and terrible performance. I've never seen such bad code, pretty much all of it is worthy of being posted on TheDailyWTF. The company has been operating for a number of years and have had a string of bad developers working on this system. I made a call on rewriting instead of refactoring since I judged it to be less work overall and decided that the result will address the requirements more appropriately, since the central requirement is to have a future-proof system for the next decade with plenty of room to scale up. Refactoring would have entailed untangling a huge ball of yarn and at the same time integrating it with a proper foundation or building a foundation from scratch. I've introduced the latest spiffy framework, unit & functional testing, CI, a bug tracker and agile workflow to the environment. I've fixed most of the performance issues of the old system (there were no indexes on any of the tables, for example). I've created an automated deployment process for the old system. The CTO has been maintaining the old system while I have been building the new one and he has been advising management that everything is being done as per best practices. However, management is hiring a contractor to come in and verify my work. In my experience, this is unprecedented. I can understand their reasoning to an extent, since they've had bad luck in the past, but can't help but feel somewhat offended at the fact that they distrust two senior developers who have been working with them for some time enough that a third party is being brought in. And it's not just me who is under watch - people's emails are constantly checked, someone had a remote desktop application installed on their computer of which I was asked to check the usage logs to try to determine if they were stealing sensitive data and there are CCTV cameras in one of the rooms. It's the first time I've decided to disable my Skype history at work. Am I right to feel indignant here? Has anyone else ever encountered such a situation? If so, how did it work out in the end? Was it worth sticking around? Should I just find another job?

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• Checking whether a specific key was pressed in enchantJS

  - by MxyL

  I am using enchantJS and would like to use the letters and numbers as well as numpad on a keyboard to do different things (eg: hotkeys). From this page http://users.csc.calpoly.edu/~foaad/enchant/guide/playerInput.html By default, enchant.js provides input listeners for six buttons: UP, DOWN, LEFT, RIGHT, A, and B. By default, the directions are bound to the arrow keys. Any of the six buttons may also be bound to any key with an ASCII value. We’ll address that later. So enchant provides the ability to bind keys to different input such as up, down, left, right...but how can I simply check whether the D or X key was pressed, and if so, perform certain actions based on that event?

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• Value type Sorting and Searching Arrays in C#:

  Value type Sorting and Searching Arrays in C#:

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• C++: Checking if an object faces a point (within a certain range)

  - by bojoradarial

  I have been working on a shooter game in C++, and am trying to add a feature whereby missiles shot must be within 90 degrees (PI/2 radians) of the direction the ship is facing. The missiles will be shot towards the mouse. My idea is that the ship's angle of rotation is compared with the angle between the ship and the mouse (std::atan2(mouseY - shipY, mouseX - shipX)), and if the difference is less than PI/4 (45 degrees) then the missile can be fired. However, I can't seem to get this to work. The ship's angle of rotation is increased and decreased with the A and D keys, so it is possible that it isn't between 0 and 2*PI, hence the use of fmod() below. Code: float userRotation = std::fmod(user->Angle(), 6.28318f); if (std::abs(userRotation - missileAngle) > 0.78f) return; Any help would be appreciated. Thanks!

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• Vector.Unproject - Checking if a model intersects a large sprite

  - by Fibericon

  Let's say I have a sprite, drawn like this: spriteBatch.Draw(levelCannons[i].texture, levelCannons[i].position, null, alpha, levelCannons[i].rotation, Vector2.Zero, scale, SpriteEffects.None, 0); Picture levelCannon as being a laser beam that goes across the entire screen. I need to see if my 3d model intersects with the screen space inhabited by the sprite. I managed to dig up Vector.Unproject, but that seems to only be useful when dealing with a single point in 2d space, rather than an area. What can I do in my case?

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• ERROR CHECKING !!

  - by moata_u

  am trying catch any error when run command in order to write an log file / report i was trying write this code : FUNCTION FOR VALIDATION function valid (){ if [ $? -eq 0 ]; then echo "$var1" ": status : OK" else echo "$var1" ": status : ERROR" fi COMMAND FUNCTION function save(){ sed -i "/:@/c connection.url=jdbc:oracle:thin:@$ip:1521:$dataBase" $search var1="adding database ip" valid $var1 sed -i "/connection.username/c connection.username=$name" #$search retval=$? var1="addning database SID" valid $var1 $retval } save OUTPUT adding database ip : status : OK sed: no input file i want out put in this way: adding database ip : status : OK sed: no input file : status : ERROR" (OR) adding database ip : status : OK addning database SID : status : ERROR" I was tried toooo much but not working with me :(((

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• Checking for collisions on a 3D heightmap

  - by Piku

  I have a 3D heightmap drawn using OpenGL (which isn't important). It's represented by a 2D array of height data. To draw this I go through the array using each point as a vertex. Three vertices are wound together to form a triangle, two triangles to make a quad. To stop the whole mesh being tiny I scale this by a certain amount called 'gridsize'. This produces a fairly nice and lumpy, angular terrain kind of similar to something you'd see in old Atari/Amiga or DOS '3D' games (think Virus/Zarch on the Atari ST). I'm now trying to work out how to do collision with the terrain, testing to see if the player is about to collide with a piece of scenery sticking upwards or fall into a hole. At the moment I am simply dividing the player's co-ordinates by the gridsize to find which vertex the player is on top of and it works well when the player is exactly over the corner of a triangle piece of terrain. However... How can I make it more accurate for the bits between the vertices? I get confused since they don't exist in my heightmap data, they're a product of the GPU trying to draw a triangle between three points. I can calculate the height of the point closest to the player, but not the space between them. I.e if the player is hovering over the centre of one of these 'quads', rather than over the corner vertex of one, how do I work out the height of the terrain below them? Later on I may want the player to slide down the slopes in the terrain.

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• XNA 2D Top Down game - FOREACH didn't work for checking Enemy and Switch-Tile

  - by aldroid16

  Here is the gameplay. There is three condition. The player step on a Switch-Tile and it became false. 1) When the Enemy step on it (trapped) AND the player step on it too, the Enemy will be destroyed. 2) But when the Enemy step on it AND the player DIDN'T step on it too, the Enemy will be escaped. 3) If the Switch-Tile condition is true then nothing happened. The effect is activated when the Switch tile is false (player step on the Switch-Tile). Because there are a lot of Enemy and a lot of Switch-Tile, I have to use foreach loop. The problem is after the Enemy is ESCAPED (case 2) and step on another Switch-Tile again, nothing happened to the enemy! I didn't know what's wrong. The effect should be the same, but the Enemy pass the Switch tile like nothing happened (They should be trapped) Can someone tell me what's wrong? Here is the code : public static void switchUpdate(GameTime gameTime) { foreach (SwitchTile switch in switchTiles) { foreach (Enemy enemy in EnemyManager.Enemies) { if (switch.Active == false) { if (!enemy.Destroyed) { if (switch.IsCircleColliding(enemy.EnemyBase.WorldCenter, enemy.EnemyBase.CollisionRadius)) { enemy.EnemySpeed = 10; //reducing Enemy Speed if it enemy is step on the Tile (for about two seconds) enemy.Trapped = true; float elapsed = (float)gameTime.ElapsedGameTime.Milliseconds; moveCounter += elapsed; if (moveCounter> minMoveTime) { //After two seconds, if the player didn't step on Switch-Tile. //The Enemy escaped and its speed back to normal enemy.EnemySpeed = 60f; enemy.Trapped = false; } } } } else if (switch.Active == true && enemy.Trapped == true && switch.IsCircleColliding(enemy.EnemyBase.WorldCenter, enemy.EnemyBase.CollisionRadius) ) { //When the Player step on Switch-Tile and //there is an enemy too on this tile which was trapped = Destroy Enemy enemy.Destroyed = true; } } } }

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