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  • How do I calculate the motion of 2 massive bodies in space?

    - by 1224
    I'm writing code simulating the 2-dimensional motion of two massive bodies with gravitational fields. The bodies' masses are known and I have a gravitational force equation. I know from that force I can get a differential equation for coordinates. I know that I once I solve this equation I will get the coordinates. I will need to make up some initial position and some initial velocity. I'd like to end up with a numeric solver for the ordinal differential equation for coordinates to get the formulas that I can write in code. Could someone break down how from laws and initial conditions we get to the formulas that calculate x and y at time t?

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  • Does an inventory limit in an MMORPG make sense?

    - by Philipp
    I am currently developing a simple 2d MMORPG. My current focus is the inventory system. I am currently wondering if I should implement a limit on what a player character can carry. Either in form of a maximum weight, a limited number of inventory slots, or a combination of both. Almost every MMORPG I ever played limits inventory space. But plausibility aside, is this really necessary from a gameplay point of view? Maybe it would in fact improve the game experience when I just let the players carry as much stuff as they want. tl;dr: What is the game development rationale behind limiting carrying capacity of player characters?

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  • Moving two objects proportionally

    - by SSL
    I'm trying to move two objects away from each other at a proportional distance, but on different scales. I'm not quite sure how to do this. Object A can go from position 0.1 to 1. Object B has no limits. If object B is decreasing, then Object A should be decreasing at rate R. Likewise, if Object B is increasing, then Object A increases at rate R. How can I tie these two Object positions together so that in an update loop, they automatically update their positions? I tried using: ObjA.Pos += 0.001f * ObjB.VelocityY; //0.001f is the rate This works but there's an error each time it runs. ObjA starts off at its max position 1 but then the next time it will stop at 0.97, 0.94, 0.91 etc.. This is due to the 0.001f rate I put in. Is there a way to control the rate, yet not end up with the rounding error?

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  • &ldquo;Using the MVVM pattern in Windows 8&rdquo; in MSDN Magazine

    - by Laurent Bugnion
    These days I am swimming in Windows 8 code, and I must say it is a good feeling. This gives me the occasion to push MVVM Light and a few other components of mine to their limits, and to fix or improve a few things on the fly. All this goodness will be available in V4.1 which is scheduled shortly after Windows 8 launch. In spite of the busy schedule, I couldn’t resist writing an article for MSDN magazine about, you guessed it, the MVVM pattern and MVVM Light in Windows 8. It is an article that goes quite in depth in some of the concepts, and provides an app demonstrating how to use them. The article is available for free in the special Windows 8 edition of MSDN magazine that just came out today. Enjoy!       Laurent Bugnion (GalaSoft) Subscribe | Twitter | Facebook | Flickr | LinkedIn

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  • Drag and Drop Team Selection

    - by davidjwest
    I have a Fantasy F1 Website, currently users select their teams using dropdown menus. It works OK but isn't as user friendly as I would like. I would like to implement a drag and drop type of system, there's jQuery code out there that would go part of the way to allowing me to do this: http://jqueryui.com/demos/draggable/ But I am not sure about how to integrate that into PHP and MySQL, my jQuery skills are limited! I'd also need to stop them spending more than a certain amount of money, each driver has a value and the teams can only spend a certain amount of money. There's also limits for example you can only pick a driver once, but you can have three different drivers. Finally, how would you decide that the user had picked their team, I don't want a submit button as that kind of defeats the object of the exercise! Thanks for any advice, I don't expect anyone to write the code for me but some pointers would be greatly appreciated.

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  • C# Regex.IsMatch returns true when it shouldn't?

    - by James Cadd
    I'm attempting to match a string that can contain any number of numeric characters or a decimal point using the following regex: ([0-9.])* Here's some C# code to test the regex: Regex regex = new Regex("([0-9.])*"); if (!regex.IsMatch("a")) throw new Exception("No match."); I expect the exception to be thrown here but it isn't - am I using the Regex incorrectly or is there an error in the pattern? EDIT: I'd also like to match a blank string.

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  • Stock ticker symbol lookup API

    - by dancavallaro
    Is there any sort of API that just offers a simple symbol lookup service? i.e., input a company name and it will tell you the ticker symbol? I've tried just screen-scraping Google Finance, but after a little while it rate limits you and you have to enter a CAPTCHA. I'm trying to batch-lookup about 2000 ticker symbols. Any ideas?

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  • How to Enable ActiveX in Chrome?

    - by Jeremiah Morrill
    I read that early builds of Chrome supported ActiveX, but was later restricted to certain MIME types (for support for say Windows Media Player). I then read Google was going to enable ActiveX strictly for the Korean market. How do I (re)enable this in Chrome? Our web based product relies on ActiveX controls from 3rd parties to play custom video. This limits us to IE. We'd love to support Chrome also, but find it impossible w/o ActiveX support.

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  • Function to Calculate Median in Sql Server

    - by Yaakov Ellis
    According to MSDN, Median is not available as an aggregate function in Transact-Sql. However, I would like to find out whether it is possible to create this functionality (using the Create Aggregate function, user defined function, or some other method). What would be the best way (if possible) to do this - allow for the calculation of a median value (assuming a numeric data type) in an aggregate query?

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  • Microsoft SQL Server 2005 Inserting into tables from child procedure which returned multiple tables

    - by Kevin
    I've got a child procedure which returns more than table. child: PROCEDURE KevinGetTwoTables AS BEGIN SELECT 'ABC' Alpha, '123' Numeric SELECT 'BBB' Alpha, '123' Numeric1, '555' Numeric2 END example: PROCEDURE KevinTesting AS BEGIN DECLARE @Table1 TABLE ( Alpha varchar(50), Numeric1 int ) DECLARE @Table2 TABLE ( Alpha varchar(50), Numeric1 int, Numeric2 int ) --INSERT INTO @Table1 EXEC KevinGetTwoTables END

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  • How to expand URLs in C#?

    - by Hao Wooi Lim
    If I have a URL like http://popurls.com/go/msn.com/l4eba1e6a0ffbd9fc915948434423a7d5, how do I expand it back to the original URL programmatically? Obviously I could use an API like expandurl.com but that will limits me to 100 requests per hour.

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  • BitSet to and from integer/long

    - by ataylor
    If I have an integer that I'd like to perform bit manipulation on, how can I load it into a java.util.BitSet? How can I convert it back to an int or long? I'm not so concerned about the size of the BitSet -- it will always be 32 or 64 bits long. I'd just like to use the set(), clear(), nextSetBit(), and nextClearBit() methods rather than bitwise operators, but I can't find an easy way to initialize a bit set with a numeric type.

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  • Performing Arithmetic on Currency Values in the form of Text using Javascript

    - by Abs
    Hello all, I am using JQuery to get the contents of a div, which only contains a price in dollars and I would like to add $99 to it, but its text, so when I do the below it won't work. $('#price_' + part[0]).text($('#price_' + part[0]).text() + 99); //Changes the div contents to $10099 - if it the contents was $100 to start with So the question is how can I add the numeric values? Thanks all

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  • How does heap compaction work quickly?

    - by Mason Wheeler
    They say that compacting garbage collectors are faster than traditional memory management because they only have to collect live objects, and by rearranging them in memory so everything's in one contiguous block, you end up with no heap fragmentation. But how can that be done quickly? It seems to me that that's equivalent to the bin-packing problem, which is NP-hard and can't be completed in a reasonable amount of time on a large dataset within the current limits of our knowledge about computation. What am I missing?

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  • Creating a Colormap Legend in Matplotlib

    - by Vince
    Hi fellow Stackers! I am using imshow() in matplotlib like so: import numpy as np import matplotlib.pyplot as plt mat = '''SOME MATRIX''' plt.imshow(mat, origin="lower", cmap='gray', interpolation='nearest') plt.show() How do I add a legend showing the numeric value for the different shades of gray. Sadly, my googling has not uncovered an answer :( Thank you in advance for the help. Vince

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  • Display AxisRenderer outside Flex Chart

    - by Leandro Ardissone
    Hi, Is there a way to display the Vertical Axis outside the graph? I need the limits of the graph to be displayed between the vertical axis, without overlapping the series over the graph. See that screenshot of what I have: I need to get something like: Or I should create a custom axis renderer component that get data from this graph and display it outside?

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  • Regular expression to match maximium of five words.

    - by KhanS
    I have a regular expression ^[a-zA-Z+#-.0-9]{1,5}$ which validates that the word contains alpha-numeric characters and few special characters and length should not be more than 5 characters. How do I make this regular expression to accept a maximum of five words matching the above regular expression.

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