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  • Is the Observer pattern adequate for this kind of scenario?

    - by Omega
    I'm creating a simple game development framework with Ruby. There is a node system. A node is a game entity, and it has position. It can have children nodes (and one parent node). Children are always drawn relatively to their parent. Nodes have a @position field. Anyone can modify it. When such position is modified, the node must update its children accordingly to properly draw them relatively to it. @position contains a Point instance (a class with x and y properties, plus some other useful methods). I need to know when a node's @position's state changes, so I can tell the node to update its children. This is easy if the programmer does something like this: @node.position = Point.new(300,300) Because it is equivalent to calling this: # Code in the Node class def position=(newValue) @position = newValue update_my_children # <--- I know that the position changed end But, I'm lost when this happens: @node.position.x = 300 The only one that knows that the position changed is the Point instance stored in the @position property of the node. But I need the node to be notified! It was at this point that I considered the Observer pattern. Basically, Point is now observable. When a node's position property is given a new Point instance (through the assignment operator), it will stop observing the previous Point it had (if any), and start observing the new one. When a Point instance gets a state change, all observers (the node owning it) will be notified, so now my node can update its children when the position changes. A problem is when this happens: @someNode.position = @anotherNode.position This means that two nodes are observing the same point. If I change one of the node's position, the other would change as well. To fix this, when a position is assigned, I plan to create a new Point instance, copy the passed argument's x and y, and store my newly created point instead of storing the passed one. Another problem I fear is this: somePoint = @node.position somePoint.x = 500 This would, technically, modify @node's position. I'm not sure if anyone would be expecting that behavior. I'm under the impression that people see Point as some kind of primitive rather than an actual object. Is this approach even reasonable? Reasons I'm feeling skeptical: I've heard that the Observer pattern should be used with, well, many observers. Technically, in this scenario there is only one observer at a time. When assigning a node's position as another's (@someNode.position = @anotherNode.position), where I create a whole new instance rather than storing the passed point, it feels hackish, or even inefficient.

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  • Best way to choose random element from weighted list

    - by Qqwy
    I want to create a simple game. Every so often, a power up should appear. Right now the different kinds of power ups are stored in an array. However, not every power up should appear equally often: For instance, a score multiplier should appear much more often than an extra life. What is the best/fastest way to pick an element at random from a list where some of the elements should be picked more often than others?

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  • Things You Need For Your SEO to Work For You

    SEO is an application which helps your website to be ranked higher in the list of search engine results. This increases the chances of your websites success to be higher as it also makes your website to be relevant to the people who visit it.

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  • How RSS Feeds Help in SEO Optimization

    RSS, which stands for Really Simple Syndication is a web feed that is designed to publish updated content such as blog post, podcast and video. Submitting your RSS feeds to the blog directory allows the search engine to crawl your blog more often so that it can pick up new content.

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  • Internal Links - On Page SEO - How to Do it Right

    One of the main reasons we do on page SEO is to communicate with the search engines. If you think of the code on your website page as being a conversation with Google, you can instruct the search engine to do what you want when it comes to indexing your website.

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  • Creating Joomla Site

    If you like a nice websites for your company business that will rank first in a search engine, JOOMLA platform is the best decision to use. JOOMLA websites can perform faster unlike with other websites developers. It is the work of expertise of JOOMLA to have a combination of knowledgeable of components, plug-ins and modules to be more competitive websites in the web. It develops website structure, content, navigation, links, prospects and search engines.

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  • Common SEO Link Building Mistakes

    Link building has grown significantly in importance in Search Engine Optimization. You can trade links, as well as purchase and sell them, though it is not something you openly do, and in many cases, if found out you can get your website removed.

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  • Web Directories Help Improve the Internet

    Web directory submission has always been in the menu list of SEO. It is one of the foremost activities for link building in promoting Web sites and helping them improve their rank with search engines. It also helps them to rank for their keywords and increase their position in search engine results page (SERP).

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  • Importance of SEO in Website Development

    The importance of SEO (Search Engine Optimisation) cannot for once be ignored in today's digital world, where it's all about being on the 'cloud' and getting recognised and known, which in turn generates business and profit. So, if you want your website to be a success, read through the article to know about the factors that need to be kept in mind.

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  • The Artistic Part Of SEO

    SEO or search engine optimization is one of today';s most popular type of internet market technique used by many web masters. And just like any other internet marketing techniques, SEO also involves t... [Author: Margarette Mcbride - Web Design and Development - May 04, 2010]

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  • SEO a Hype in E-Marketing

    Search Engine Optimization or SEO is the most recent big thing in the world of online marketing. To keep up with the fast pace of the Internet people are using SEO as one of their techniques on their existing web sites or blogs. SEO is most definitely the key to online success.

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  • How to Increase SEO Efficiency

    So you would want to increase your SEO efficiency immediately. Well you will have to make use of professional search engine optimization techniques in order to get the desired results shortly. They are typically known as On Page Optimization, and Off Page Optimization.

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  • Backlinks Are Important For SEO

    Online advertising is all about Search Engine Optimization and Backlink Building is part of the strategy. The Online Advertising Course tells you why Backlinks are important, what Backlink tools are available and how you can create Backlinks yourself.

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  • 3 Ways to Help Your Website Be Seen Online

    When it comes to conducting business online, having good search engine optimization (SEO) foundations is just as important as having a Web site in the first place. Whether you use your Web site to share information about your business, get customers, sell a product or service, or more, it's essential that you incorporate some tried and true SEO strategies if your Web site is going to successfully serve its purpose.

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  • Tips to Optimize Your Website

    Search engine optimization is a very essential task to be performed after designing a website. There are two major and powerful things that has to be done to optimize a website for various search engines.

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