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• Algorithm to match items be value into sets base on total

  - by Ben

  Given n sets of items. Each item has a value. The items in a set have similar values but vary by a small amount. The goal is to create new sets containing three items selected from the original sets such that the total of the values is within a given range. Only one item a source set can be selected. For example: If we have the following starting sets: Set A - { 4.0, 3.8, 4.2 } Set B - { 7.0, 6.8, 7.2 } Set C - { 1.0, 0.9, 1.1 } Set D - { 6.5, 6.4, 6.6 } Set E - { 2.5, 2.4, 2.6 } Goal is to create sets containing three elements such that the total is between 11.9 and 12.1. For example { 3.8, 7.2, 1.0 } There can be unused elements. Can someone suggest an algorithm for this problem?

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• Salon du E-commerce et Social CRM B2B

  - by Valérie De Montvallon

  Nous participions au Salon du E-commerce et Social CRM B2B en septembre dernier et nous vous proposons la vidéo réalisée par Les décideurs de la relation client. Découvrez des avis d'experts de la Relation Client pour en savoir toujours plus sur le Social CRM BtoB. Pour le BtoB, la gestion de la Relation Client semble bien simple quand il s’agit de récolter des informations à partir d’appels téléphoniques, d’entretiens physiques ou d’emails. Toutefois, la tâche s’enhardit sur les réseaux sociaux. Ces plateformes sont-elles réellement adaptées au BtoB ? Comment procéder quand on se lance ? Quels sont les pièges à éviter ? Quels sont les éléments qui laissent à penser que le Social CRM BtoB est une vraie tendance de la Relation Client ? Autant de questions auxquelles les experts rencontrés ont apporté des éléments de réponse. Vous découvrirez l'interview de notre expert, Khalid Madarbokus, qui s'exprime sur la remontée d'informations depuis les médias sociaux au sein des départements d'une entreprise B2B (à 3:20)

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• Manipulating DOM using jQuery

  - by bipinjoshi

  By now you know how to alter existing elements and their attributes. jQuery also allows you insert, append, remove and replace elements from HTML DOM so that you can modify the document structure. For example, say you are calling some WCF service from client script and based on its return values need to generate HTML table on the fly. In this article I am going to demonstrate some of these jQuery features by developing a simple RSS gadget that grabs and displays RSS feed items in a web form.http://www.bipinjoshi.net/articles/90f4fbef-ef36-467b-8ca0-d0922a5902b0.aspx 

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• Why the overhead when allocating objects/arrays in Java?

  - by Gnijuohz

  How many bytes an array occupies in Java? Assume It's a 64bit machine and also assume there are N elements in an array, so all these elements would take up 2*N, 4*N or 8*N bytes for different types of array. And a lecture in Coursera says that it would occupy 2*N+24, 4*N+24 or 8*N+24 bytes for a N element array and the 24 bytes is called overhead, but didn't explain why the overhead is needed. Also objects have overheads, which is 16 bytes. What exactly are these overheads? What are these 24/16 bytes composed of? Also, do these overheads only exist in Java? How about C, C++ and Python?

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• How to break out of if statement

  - by TheBroodian

  I'm not sure if the title is exactly an accurate representation of what I'm actually trying to ask, but that was the best I could think of. I am experiencing an issue with my character class. I have developed a system so that he can perform chain attacks, and something that was important to me was that 1)button presses during the process of an attack wouldn't interrupt the character, and 2) at the same time, button presses should be stored so that the player can smoothly queue up chain attacks in the middle of one so that gameplay doesn't feel rigid or unresponsive. This all begins when the player presses the punch button. Upon pressing the punch button, the game checks the state of the dpad at the moment of the button press, and then translates the resulting combined buttons into an int which I use as an enumerator relating to a punch method for the character. The enumerator is placed into a List so that the next time the character's Update() method is called, it will execute the next punch in the list. It only executes the next punch if my character is flagged with acceptInput as true. All attacks flag acceptInput as false, to prevent the interruption of attacks, and then at the end of an attack, acceptInput is set back to true. While accepting input, all other actions are polled for, i.e. jumping, running, etc. In runtime, if I attack, and then queue up another attack behind it (by pressing forward+punch) I can see the second attack visibly execute, which should flag acceptInput as false, yet it gets interrupted and my character will stop punching and start running if I am still holding down the dpad. Included is some code for context. This is the input region for my character. //Placed this outside the if (acceptInput) tree because I want it //to be taken into account whether we are accepting input or not. //This will queue up attacks, which will only be executed if we are accepting input. //This creates a desired effect that helps control the character in a // smoother fashion for the player. if (Input.justPressed(buttonManager.Punch)) { int dpadPressed = Input.DpadState(0); if (attackBuffer.Count() < 1) { attackBuffer.Add(CheckPunch(dpadPressed)); } else { attackBuffer.Clear(); attackBuffer.Add(CheckPunch(dpadPressed)); } } if (acceptInput) { if (attackBuffer.Count() > 0) { ExecutePunch(attackBuffer[0]); attackBuffer.RemoveAt(0); } //If D-Pad left is being held down. if (Input.DpadDirectionHeld(0, buttonManager.Left)) { flipped = false; if (onGround) { newAnimation = "run"; } velocity = new Vector2(velocity.X - acceleration, velocity.Y); if (walking == true && velocity.X <= -walkSpeed) { velocity.X = -walkSpeed; } else if (walking == false && velocity.X <= -maxSpeed) { velocity.X = -maxSpeed; } } //If D-Pad right is being held down. if (Input.DpadDirectionHeld(0, buttonManager.Right)) { flipped = true; if (onGround) { newAnimation = "run"; } velocity = new Vector2(velocity.X + acceleration, velocity.Y); if (walking == true && velocity.X >= walkSpeed) { velocity.X = walkSpeed; } else if (walking == false && velocity.X >= maxSpeed) { velocity.X = maxSpeed; } } //If jump/accept button is pressed. if (Input.justPressed(buttonManager.JumpAccept)) { if (onGround) { Jump(); } } //If toggle element next button is pressed. if (Input.justPressed(buttonManager.ToggleElementNext)) { if (elements.Count != 0) { elementInUse++; if (elementInUse >= elements.Count) { elementInUse = 0; } } } //If toggle element last button is pressed. if (Input.justPressed(buttonManager.ToggleElementLast)) { if (elements.Count != 0) { elementInUse--; if (elementInUse < 0) { elementInUse = Convert.ToSByte(elements.Count() - 1); } } } //If character is in the process of jumping. if (jumping == true) { if (Input.heldDown(buttonManager.JumpAccept)) { velocity.Y -= fallSpeed.Y; maxJumpTime -= elapsed; } if (Input.justReleased(buttonManager.JumpAccept) || maxJumpTime <= 0) { jumping = false; maxJumpTime = 0; } } //Won't execute abilities if input isn't being accepted. foreach (PlayerAbility ability in playerAbilities) { if (buffer.Matches(ability)) { if (onGround) { ability.Activate(); } if (!onGround && ability.UsableInAir) { ability.Activate(); } else if (!onGround && !ability.UsableInAir) { buffer.Clear(); } } } } When the attackBuffer calls ExecutePunch(int) method, ExecutePunch() will call one of the following methods: private void NeutralPunch1() //0 { acceptInput = false; busy = true; newAnimation = "punch1"; numberOfAttacks++; timeSinceLastAttack = 0; } private void ForwardPunch2(bool toLeft) //true == 7, false == 4 { forwardPunch2Timer = 0f; acceptInput = false; busy = true; newAnimation = "punch2begin"; numberOfAttacks++; timeSinceLastAttack = 0; if (toLeft) { velocity.X -= 800; } if (!toLeft) { velocity.X += 800; } } I assume the attack is being interrupted due to the fact that ExecutePunch() is in the same if statement as running, but I haven't been able to find a suitable way to stop this happening. Thank you ahead of time for reading this, I apologize for it having become so long winded.

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• Turn Your Browser Pane into a Game of Katamari Damacy

  - by Jason Fitzpatrick

  If you’re a fan of Katamari Damacy, a quirky and fun Japanese puzzle game made popular on the PlayStation, you’ll love this Javas script hack that turns your browser pane and its contents into a giant HTML-collecting game of Katamari Damacy. Katamari Damacy, for the unfamiliar, is a addictive game based on the premise that a galactic prince is on a mission to rebuild stars, constellations, and moons accidentally destroyed by his father. You roll around and collect objects (making yourself an increasingly larger ball in the process). This script hack puts a ball on your web browser pane (works best in Chrome) that you can roll around collecting elements from the web page. At first you can only grab links but as you grow you can grab increasingly large objects like photo elements off the page. It doesn’t have the sophisticated graphics of the Playstation version, of course, nor the detailed back story, but it’s a clever little hack that is sure to delight fans of Katamari Damacy. Katamari Hack [KatHack] Internet Explorer 9 Released: Here’s What You Need To KnowHTG Explains: How Does Email Work?How To Make a Youtube Video Into an Animated GIF

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• Oracle HRMS API – Update Employee Assignment

  - by PRajkumar

  To Update Supervisor, Manager Flag, Bargaining Unit, Labour Union Member Flag, Gre, Time Card, Work Schedule, Normal Hours, Frequency, Time Normal Finish, Time Normal Start, Default Code Combination, Set of Books Id API -- hr_assignment_api.update_emp_asg   To Update Grade, Location, Job, Payroll, Organization, Employee Category, People Group API -- hr_assignment_api.update_emp_asg_criteria   Example --   DECLARE    -- Local Variables    -- -----------------------    lc_dt_ud_mode           VARCHAR2(100)    := NULL;    ln_assignment_id       NUMBER                  := 33561;    ln_supervisor_id        NUMBER                  := 2;    ln_object_number       NUMBER                  := 1;    ln_people_group_id  NUMBER                  := 1;      -- Out Variables for Find Date Track Mode API    -- -----------------------------------------------------------------    lb_correction                           BOOLEAN;    lb_update                                 BOOLEAN;    lb_update_override              BOOLEAN;    lb_update_change_insert   BOOLEAN;       -- Out Variables for Update Employee Assignment API    -- ----------------------------------------------------------------------------    ln_soft_coding_keyflex_id       HR_SOFT_CODING_KEYFLEX.SOFT_CODING_KEYFLEX_ID%TYPE;    lc_concatenated_segments       VARCHAR2(2000);    ln_comment_id                             PER_ALL_ASSIGNMENTS_F.COMMENT_ID%TYPE;    lb_no_managers_warning        BOOLEAN;  -- Out Variables for Update Employee Assgment Criteria  -- -------------------------------------------------------------------------------  ln_special_ceiling_step_id                    PER_ALL_ASSIGNMENTS_F.SPECIAL_CEILING_STEP_ID%TYPE;  lc_group_name                                          VARCHAR2(30);  ld_effective_start_date                             PER_ALL_ASSIGNMENTS_F.EFFECTIVE_START_DATE%TYPE;  ld_effective_end_date                              PER_ALL_ASSIGNMENTS_F.EFFECTIVE_END_DATE%TYPE;  lb_org_now_no_manager_warning   BOOLEAN;  lb_other_manager_warning                  BOOLEAN;  lb_spp_delete_warning                          BOOLEAN;  lc_entries_changed_warning                VARCHAR2(30);  lb_tax_district_changed_warn             BOOLEAN;   BEGIN    -- Find Date Track Mode    -- --------------------------------    dt_api.find_dt_upd_modes    (    p_effective_date                  => TO_DATE('12-JUN-2011'),         p_base_table_name            => 'PER_ALL_ASSIGNMENTS_F',         p_base_key_column           => 'ASSIGNMENT_ID',         p_base_key_value               => ln_assignment_id,          -- Output data elements          -- --------------------------------          p_correction                          => lb_correction,          p_update                                => lb_update,          p_update_override              => lb_update_override,          p_update_change_insert   => lb_update_change_insert      );      IF ( lb_update_override = TRUE OR lb_update_change_insert = TRUE )    THEN        -- UPDATE_OVERRIDE        -- ---------------------------------        lc_dt_ud_mode := 'UPDATE_OVERRIDE';    END IF;     IF ( lb_correction = TRUE )   THEN       -- CORRECTION       -- ----------------------      lc_dt_ud_mode := 'CORRECTION';   END IF;     IF ( lb_update = TRUE )   THEN       -- UPDATE       -- --------------       lc_dt_ud_mode := 'UPDATE';    END IF;     -- Update Employee Assignment   -- ---------------------------------------------  hr_assignment_api.update_emp_asg  ( -- Input data elements   -- ------------------------------   p_effective_date                              => TO_DATE('12-JUN-2011'),   p_datetrack_update_mode         => lc_dt_ud_mode,   p_assignment_id                            => ln_assignment_id,   p_supervisor_id                              => NULL,   p_change_reason                           => NULL,   p_manager_flag                              => 'N',   p_bargaining_unit_code              => NULL,   p_labour_union_member_flag   => NULL,   p_segment1                                       => 204,   p_segment3                                       => 'N',   p_normal_hours                              => 10,   p_frequency                                       => 'W',   -- Output data elements   -- -------------------------------   p_object_version_number             => ln_object_number,   p_soft_coding_keyflex_id              => ln_soft_coding_keyflex_id,   p_concatenated_segments             => lc_concatenated_segments,   p_comment_id                                   => ln_comment_id,   p_effective_start_date                      => ld_effective_start_date,   p_effective_end_date                        => ld_effective_end_date,   p_no_managers_warning               => lb_no_managers_warning,   p_other_manager_warning            => lb_other_manager_warning  );    -- Find Date Track Mode for Second API   -- ------------------------------------------------------   dt_api.find_dt_upd_modes   (  p_effective_date                   => TO_DATE('12-JUN-2011'),      p_base_table_name            => 'PER_ALL_ASSIGNMENTS_F',      p_base_key_column           => 'ASSIGNMENT_ID',      p_base_key_value               => ln_assignment_id,      -- Output data elements      -- -------------------------------      p_correction                           => lb_correction,      p_update                                 => lb_update,      p_update_override               => lb_update_override,      p_update_change_insert    => lb_update_change_insert   );     IF ( lb_update_override = TRUE OR lb_update_change_insert = TRUE )   THEN     -- UPDATE_OVERRIDE     -- --------------------------------     lc_dt_ud_mode := 'UPDATE_OVERRIDE';   END IF;      IF ( lb_correction = TRUE )    THEN      -- CORRECTION      -- ----------------------      lc_dt_ud_mode := 'CORRECTION';   END IF;      IF ( lb_update = TRUE )    THEN      -- UPDATE      -- --------------      lc_dt_ud_mode := 'UPDATE';    END IF;    -- Update Employee Assgment Criteria  -- -----------------------------------------------------  hr_assignment_api.update_emp_asg_criteria  ( -- Input data elements   -- ------------------------------   p_effective_date                                   => TO_DATE('12-JUN-2011'),   p_datetrack_update_mode               => lc_dt_ud_mode,   p_assignment_id                                 => ln_assignment_id,   p_location_id                                        => 204,   p_grade_id                                             => 29,   p_job_id                                                  => 16,   p_payroll_id                                          => 52,   p_organization_id                               => 239,   p_employment_category                    => 'FR',   -- Output data elements   -- -------------------------------   p_people_group_id                              => ln_people_group_id,   p_object_version_number                   => ln_object_number,   p_special_ceiling_step_id                  => ln_special_ceiling_step_id,   p_group_name                                        => lc_group_name,   p_effective_start_date                           => ld_effective_start_date,   p_effective_end_date                             => ld_effective_end_date,   p_org_now_no_manager_warning  => lb_org_now_no_manager_warning,   p_other_manager_warning                 => lb_other_manager_warning,   p_spp_delete_warning                         => lb_spp_delete_warning,   p_entries_changed_warning              => lc_entries_changed_warning,   p_tax_district_changed_warning     => lb_tax_district_changed_warn  );    COMMIT; EXCEPTION          WHEN OTHERS THEN                       ROLLBACK;                       dbms_output.put_line(SQLERRM); END; / SHOW ERR;    

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• DDD / Layers and legacy systems

  - by CSM

  I have to refactor a complex C# app (many dialogs, mixed logic and so on). There is a part managing the communication with special hardware equipments (sending commands and receive data via asynchronous c# callbacks). The code is "spaghetti" with mixed UI/Logic/Communication/etc and my task is to split the layers in a DDD sense. So, to which layer belongs a callback driver routine? The callbacks are creating "bubbles" in the system, up to the UI layer and because of this I cannot enforce the essential principle that any element of a layer depends only on other elements in the same layer or on elements of the layers "beneath" it. Thank you in advance.

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• Handling array passed to object at creation

  - by cecilli0n

  When creating my object I pass it an array of a row from my database. (everything in the array we will need, disregarding unnecessary elements at sql query level) When I need to access certain array elements from within my class, I do so like $this->row['element'] However, As I continue development, I sometimes forget what exactly is in this passed array.(this itself doesn't seem good) I am wondering if their is a professional approach to dealing with this, Or am I the only one who has these "I wonder whats in the array" thoughts. One approach to tackling this could be that when we originally pass the array, in the constructor, we assign each element of the array to its own variable, but is this considered professional practice? Additionally by doing this, we could make those variables constants, in a attempt at immutability. Overall I am trying to adhere to good software craftsmanship. Regards.

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• pop up html as javascript string instead of hidden div for seo [closed]

  - by user1324762

  Possible Duplicate: How bad is it to use display: none in CSS? I have heard that using display:none or visibility:hidden css properties are not a very good idea for seo purposes. I have about 4 different pop up windows to display and each one has about 20 words inside it. I can create hidden divs. Another option is to store div html elements as javascript string. In this way pop up html elements will be generated from javascript string. This will be still faster than using ajax since the data is static. Is this method absolutely safe for SEO? P.S.: I was just asking about similar question on http://stackoverflow.com/questions/12389075/storing-data-in-javascript-array-for-further-use, but this one is different, it is about static data and about SEO.

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• Level Representation in a 2D Game

  - by meszar.imola

  I would like to create a 2D game, where a character should move on a stage/level. My stage would be static, constructed some little cubes, similar to the well-known Mario game: some of the elements should represent an element of the way where the character can step, but if the element is missing, the character should fall. My problem is, how to represent this programmatically? My first thought was to represent the stage with a vector, which should contain boolean elements, depending on the state of the element on the stage - if it's missing or not. But this means, I have to verify at my character's x or y position change if it has a stage element under or not (if not, to simulate the falling of the character) - I think it is not the best practice, it's not the beautiful solution. Can you help me with some advice, how to represent the stage?

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• How do I convert matrices intended for OpenGL to be compatible for DirectX?

  - by gardian06

  I have finished working through the book "Game Physics Engine Development 2nd Ed" by Millington, and have got it working, but I want to adapt it to work with DirectX. I understand that D3D9+ has the option to use either left handed, or right handed convention, but I am unsure about how to return my matrices to be usable by D3D. The source code gives returning OpenGL column major matrices (the transpose of the working transform matrix shown below), but DirectX is row major. For those unfamiliar for the organization of the matrices used in the book: [r11 r12 r13 t1] [r21 r22 r23 t2] [r31 r32 r33 t3] [ 0 0 0 1] r## meaning the value of that element in the rotation matrix, and t# meaning the translation value. So the question in short is: How do I convert the matrix above to be easily usable by D3D? All of the documentation that I have found simply states that D3D is row major, but not where to put what elements so that it is usable by D3D in terms of rotation, and translation elements.

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• Should package structure closely resemble class hierarchy?

  - by Panzercrisis

  Pretty simple question. Should package structure closely resemble class hierarchy? If so, how closely? Why or why not? For instance, let's say you've got class A and class B, plus class AFactory and class BFactory. You put class A and class B in the package com.something.elements, and you put AFactory and BFactory in com.something.elements.factories. AFactory and BFactory would be further down the hierarchy package-wise, but they'd be further up class-wise. Is this sort of thing a good idea or a bad idea?

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• How much should I rely on Visual Studio's Auto Generated Code?

  - by Ant

  So I'm reading up on ASP.NET with VB.NET and I want to start making my own, professionally built website using ASP. I'm wondering though; I'm still using the basics so I'm really just a novice, but how much should I rely on Visual Studio to create my elements? Should I make my own text boxes and have my own login routine, or should I just use ASP's login features? I know eventually you have to use your own classes and such which is where the real coding comes in, but I'm not sure how relaible, flexible and secure the pre-wrote elements are? Any help would be greatly appreciated.

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• Construct an array from an existing array

  - by Luv

  Given an array of integers A[1...n-1] where 'N' is the length of array A[ ]. Construct an array B such that B[i] = min(A[i], A[i+1], ..., A[i+K-1]), where K will be given. Array B will have N-K+1 elements. We can solve the problem using min-heaps Construct min-heap for k elements - O(k) For every next element delete the first element and insert the new element and heapify Hence Worst Case Time - O( (n-k+1)*k ) + O(k) Space - O(k) Can we do it better?

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• Case Management Model and Notation (CMMN) by Torsten Winterberg

  - by JuergenKress

  The beta version of the current working draft of the new OMG paper can be found here. This figure 72 shows an example, how a case (here: writing a document) can be modeled using CMMN elements: Table 43 explains, where the different types of decorators can be used: The meaning if the elements and the decorations are explained in the CMMN beta document. Read the full article here. SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Mix Forum Technorati Tags: ACM,BPM,Torsten Winterberg,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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• css - use universal '*' selector vs. html or body selector?

  - by Michael Durrant

  Applying styles to the body tag will be applied to the whole page, so body { font-family: Verdana } will be applied to the whole page. This could also be done with * {font-family: Verdana} which would apply to all elements and so would seem to have the same effect. I understand the principle that in the first instance the style is being applied to one tag, body for the whole page whereas in the second example the font is being applied against each individual html elements. What I am asking is what is the practical difference in doing that, what are the implications and what is a reason, situation or best practice that leads to using one over another. One side-effect is certainly speed (+1 Rob). I am most interested in the actual reason to choose one over the other in terms of functionality.

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• what's the overhead when allocating objects/arrays in Java?

  - by Gnijuohz

  How many bytes an array occupies in Java? Assume It's a 64bit machine and also assume there are N elements in an array, so all these elements would take up 2*N, 4*N or 8*N bytes for different types of array. And a lecture in Coursera says that it would occupy 2*N+24, 4*N+24 or 8*N+24 bytes for a N element array and the 24 byte is called overhead, but didn't explain it. Also objects have overheads, which is 16 bytes. What exactly are these overheads? Also, do these overheads only exist in Java? How about C, C++ and Python?

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• Framework for interaction between web-page and server-side script

  - by Carrier

  I want to make a web-page that will have several controls elements, among which there are elements like check-boxes, radio-buttons, "range selectors" (one can specify the min and max value, like it is done when you select range for prices in the online markets). The new values shall be sent to the "server-side", once changed (without any Submit buttons etc), and the "server-side" can return something (one or more numbers, etc). Does anyone know a good ajax-like framework that allows (with minimal adaptation / changes) to make such solution in an easy way? It will be good if the server-side of existing solution will be in Perl (not a big deal, but I know it much better than PHP or something else). Set of controls might change and depend on other parameter, so adding one extra element should not cause rewriting the whole thing. P.S.: I haven't working in this area for quite a while, so not aware of existing solutions in this area, and don't want to invent the wheel and write everything from scratch for something that already exist (at least, I hope so). Thanks in advance!

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• Html 5 &ndash; new size units

  - by Norgean

  There are some new size units with CSS 3, which allows you to resize elements relative to the viewport size. They are vw, vh, vmin (that’s vm in IE), and perhaps vmax. (Viewport width, height, smaller of the two, larger of the two.) 8vw is 8% of the viewport width – or 205 pixels on my 2560 screen. I created a tiny demo clock which sizes the elements so that it uses the whole screen. Clock – in Norwegian, but it’s the source that is interesting… Bug: Resize does not work. Tested for IE 9 & 10 and Chrome. Firefox and Safari: does not work.

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• What techniques can I use to render very large numbers of objects more efficiently in OpenGL?

  - by Luke

  You can think of my application as drawing a very large ball-and-stick diagram (or graph). At times, this graph can get very large, where the number of elements even outnumbers the pixels on the screen. Currently I am simply passing all of my textures (as GL_POINTS) and lines to the graphics card using VBO's. When the number of elements outnumbers the number of pixels, is this the most efficient way to do this? Or should I do some calculations on the CPU side before handing everything over to the GPU? If it matters, I do use GL_DEPTH_TEST and GL_ALPHA_TEST. I do some alpha blending, but probably not enough to make a huge performance difference. My scene can be static at times, but the user has control over a typical arc-ball camera and can pan, rotate, or zoom. It is during these operations that performance degradation is noticeable.

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• Should I use events in this case?

  - by joon

  I'm creating a video player, like a custom YouTube player. All of the GUI elements (progress bar, video player, play button, ...) are different classes, but I obviously need them to communicate. When the progress bar is clicked, or the slider is moved, it needs to send a "seek(x)" command to the video player. Similarly, the video player needs to update the progressbar every frame. Currently I'm doing this by having almost all elements have a link to each other. So when I create the progress bar, I'm telling it where the video player is. But after a while this becomes more and more complicated, and I'm wondering if events would be a better way to do this. Or a main controller class that has all the connections. What should I do?

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• Resolving equivalence relations

  - by Luca Cerone

  I am writing a function to label the connected component in an image (I know there are several libraries outside, I just wanted to play with the algorithm). To do this I label the connected regions with different labels and create an equivalence table that contain information on the labels belonging to the same connected component. As an example if my equivalence table (vector of vector) looks something like: 1: 1,3 2: 2,3 3: 1,2,3 4: 4 It means that in the image there are 2 different regions, one made of elements that are labelled 1,2,3 and an other made of elements labelled 4. What is an easy and efficient way to resolve the equivalences and end up with something that looks like: 1: 1,2,3 2: 4 that I can use to "merge" the different connected regions belonging to the same connected component? Thanks a lot for the help!

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• Windows Ribbon for WinForms, Part 21 – SizeDefinition

  In this article I'll present how to define custom size definitions for ribbon group elements.

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• Accessing Array and Collection using LINQ

  This article will teach you about how you can Access Array elements and Collections using LINQ.

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