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  • Using my custom colormap in Java for images

    - by John
    Hi everyone! I've got a question concering a colormapping via index. I tried this code found on http://www.podgoretsky.pri.ee/ftp/Docs/Java/Tricks%20of%20the%20Java%20Programming%20Gurus/ch12.htm // Gradient.java // Imports import java.applet.Applet; import java.awt.; import java.awt.image.; public class Gradient extends Applet { final int colors = 32; final int width = 200; final int height = 200; Image img; public void init() { // Create the color map byte[] rbmap = new byte[colors]; byte[] gmap = new byte[colors]; for (int i = 0; i < colors; i++) gmap[i] = (byte)((i * 255) / (colors - 1)); // Create the color model int bits = (int)Math.ceil(Math.log(colors) / Math.log(2)); IndexColorModel model = new IndexColorModel(bits, colors, rbmap, gmap, rbmap); // Create the pixels int pixels[] = new int[width * height]; int index = 0; for (int y = 0; y < height; y++) for (int x = 0; x < width; x++) pixels[index++] = (x * colors) / width; // Create the image img = createImage(new MemoryImageSource(width, height, model, pixels, 0, width)); } public void paint(Graphics g) { g.drawImage(img, 0, 0, this); } } It worked great but I tried to load a custom image jpeg mapped on my own colormap but it didnt work right. I saw only a bunch of green and blue pixels drawn on a white background. My custom color map method here: public void inintByteArrays() { double[][] c = // basic color map { { 0.0000, 0.0000, 0.5625 }, { 0.0000, 0.0000, 0.6250 }, { 0.0000, 0.0000, 0.6875 }, { 0.0000, 0.0000, 0.6875 }, { 0.0000, 0.0000, 0.7500 }, { 0.0000, 0.0000, 0.8125 }, { 0.0000, 0.0000, 0.8750 }, { 0.0000, 0.0000, 0.9375 }, { 0.0000, 0.0000, 1.0000 }, { 0.0000, 0.0625, 1.0000 }, { 0.0000, 0.1250, 1.0000 }, { 0.0000, 0.1875, 1.0000 }, { 0.0000, 0.2500, 1.0000 }, { 0.0000, 0.3125, 1.0000 }, { 0.0000, 0.3750, 1.0000 }, { 0.0000, 0.4375, 1.0000 }, { 0.0000, 0.5000, 1.0000 }, { 0.0000, 0.5625, 1.0000 }, { 0.0000, 0.6250, 1.0000 }, { 0.0000, 0.6875, 1.0000 }, { 0.0000, 0.7500, 1.0000 }, { 0.0000, 0.8125, 1.0000 }, { 0.0000, 0.8750, 1.0000 }, { 0.0000, 0.9375, 1.0000 }, { 0.0000, 1.0000, 1.0000 }, { 0.0625, 1.0000, 0.9375 }, { 0.1250, 1.0000, 0.8750 }, { 0.1875, 1.0000, 0.8125 }, { 0.2500, 1.0000, 0.7500 }, { 0.3125, 1.0000, 0.6875 }, { 0.3750, 1.0000, 0.6250 }, { 0.4375, 1.0000, 0.5625 }, { 0.5000, 1.0000, 0.5000 }, { 0.5625, 1.0000, 0.4375 }, { 0.6250, 1.0000, 0.3750 }, { 0.6875, 1.0000, 0.3125 }, { 0.7500, 1.0000, 0.2500 }, { 0.8125, 1.0000, 0.1875 }, { 0.8750, 1.0000, 0.1250 }, { 0.9375, 1.0000, 0.0625 }, { 1.0000, 1.0000, 0.0000 }, { 1.0000, 0.9375, 0.0000 }, { 1.0000, 0.8750, 0.0000 }, { 1.0000, 0.8125, 0.0000 }, { 1.0000, 0.7500, 0.0000 }, { 1.0000, 0.6875, 0.0000 }, { 1.0000, 0.6250, 0.0000 }, { 1.0000, 0.5625, 0.0000 }, { 1.0000, 0.5000, 0.0000 }, { 1.0000, 0.4375, 0.0000 }, { 1.0000, 0.3750, 0.0000 }, { 1.0000, 0.3125, 0.0000 }, { 1.0000, 0.2500, 0.0000 }, { 1.0000, 0.1875, 0.0000 }, { 1.0000, 0.1250, 0.0000 }, { 1.0000, 0.0625, 0.0000 }, { 1.0000, 0.0000, 0.0000 }, { 0.9375, 0.0000, 0.0000 }, { 0.8750, 0.0000, 0.0000 }, { 0.8125, 0.0000, 0.0000 }, { 0.7500, 0.0000, 0.0000 }, { 0.6875, 0.0000, 0.0000 }, { 0.6250, 0.0000, 0.0000 }, { 0.5625, 0.0000, 0.0000 }, { 0.5000, 0.0000, 0.0000 } }; for (int i = 0; i < c.length; i++) { for (int j = 0; j < c[i].length; j++) { if (j == 0) r[i] = (byte) ((byte) c[i][j]*255); if (j == 1) g[i] = (byte) ((byte) c[i][j]*255); if (j == 2) b[i] = (byte) ((byte) c[i][j]*255); } } My question is how I can use my colormap for any image I want to load and map in the right way. Thank you very much! Greetings, protein1.

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  • Should I move client to Lamp or develop on Wamp?

    - by John Isaacks
    I have never developed for WAMP, the hosting guy for my new client says they are using Windows servers, they can setup PHP and MySQL for me, but they cannot switch to a *nix server. He said there are some nuances from PHP on *nix Vs. win. So my question is, if I have never programmed PHP on win, should I go through the hassle of switching hosts (since they cannot do *nix themselves), or are the differences slight enough that it shouldn't be too big a problem for me? (side note: the state of the clients website has no effect since it is a static all-flash site and is going to be completely rebuilt) Thanks!

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  • Web app implementation question.

    - by John Berryman
    I would like to create a web app similar to Stack Overflow in that the users will have different "point" levels and that their capabilities within the web app will be different based upon their point level. Question: How can this best be implemented? How can it be implemented in a way that is un-hackable (i.e. accessing capabilities that should not be available)? I figure there are two ways to do this: server-side and client-side. For the server-side solution, for each page request you check who the user is and have the CGI rewrite the page so that the client only gets a web page with the intended capabilities. For the client-side solution, the server gives the client the fully capable app and it is the client's job to check the point level and to handicap the app appropriately. It seems like the client-side solution would be easier on the server, (which is really important for my app), but more susceptible to someone hacking and using capabilities unwarranted by their point level.

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  • Javascript Replace Child/Loop issue

    - by Charles John Thompson III
    I have this really bizarre issue where I have a forloop that is supposed to replace all divs with the class of "original" to text inputs with a class of "new". When I run the loop, it only replaces every-other div with an input, but if I run the loop to just replace the class of the div and not change the tag to input, it does every single div, and doesn't only do every-other. Here is my loop code, and a link to the live version: live version here function divChange() { var divs = document.getElementsByTagName("div"); for (var i=0; i<divs.length; i++) { if (divs[i].className == 'original') { var textInput = document.createElement('input'); textInput.className = 'new'; textInput.type = 'text'; textInput.value = divs[i].innerHTML; var parent = divs[i].parentNode; parent.replaceChild(textInput, divs[i]); } } }

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  • C++ arrays select square number and make new vector

    - by John Smith
    I have to see which of the following from a vector is a square number then make another vector with only the square numbers For example: (4,15,6,25,7,81) the second will be (4,25,81) 4,25,81 because 2x2=4 5x5=25 and 9x9=81 I started like this: { int A[100],n,r,i; cout<<"Number of elements="; cin>>n; for(i=1;i<=n;i++) { cout<<"A["<<i<<"]="; cin>>A[i]; } for(i=1;i<=n;i++) { r=sqrt(A[i]); if(r*r==A[i]) } return 0; } but I am not really sure how to continue

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  • Linux file names & file globbing

    - by John Lelos
    I have a list of files named: file000 file001 file002 file003 ... file1100 How can I match all files that have a number greater than 800 but less than 1000 ? I am using linux bash Thank you Edit Actually, my files are named like: ab869.enc cp936.enc g122345.enc x2022.enc abc8859-14.enc aax5601.enc cp936-1.enc so the first solution dont match the correct files :( How can I match files that have number between 800-999 ?

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  • VB.NET FileSystemWatcher Multiple Change Events

    - by John
    Hi. I have the following code: Imports System.IO Public Class Blah Public Sub New() InitializeComponent() Dim watcher As New FileSystemWatcher("C:\") watcher.EnableRaisingEvents = True AddHandler watcher.Changed, AddressOf watcher_Changed End Sub Private Sub watcher_Changed(ByVal sender As Object, ByVal e As FileSystemEventArgs) MsgBox(e.FullPath) End Sub End Class When I run it and save changes to a file on my C drive, the code works great, except it executes the watcher_Changed() method four times. Any idea why? The changeType is "4" every time. Thanks.

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  • android internal phone storage

    - by John
    how can you retrieve yours phone internal storage from an app? I found memoryinfo, but it seems that returns information on how much memory your currently running tasks. I am trying to get my app to retrieve how much internal phone storage is available.

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  • How can I detect when the .NET Framework feature is "turned off" in Windows 7 / Vista?

    - by John Myczek
    My application requires the .NET Framework version 3.5. I recently ran into a customer that had the .NET Framework installed but turned off on Windows Vista (also applies to Windows 7). In this case, my installer (InstallShield 2009) does not prompt the user to install the Framework (because it is already installed) and when my application runs it crashes immediately. I tried another .NET application and it also crashes immediately. Is there any way to detect this situation and handle it more gracefully? Just detecting this during install is not ideal since the .NET Framework can be turned off at any time. Ideally, the application would be able to check and display a friendly message to the user telling them they need to turn on the .NET Framework. EDIT: "Turning off" the .NET Framework in Windows Vista or Windows 7 is not the same as uninstalling it. The Framework can be simply turned back on without reinstalling: http://windows.microsoft.com/en-US/windows-vista/Turn-Windows-features-on-or-off

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  • What tools do you have at your disposal as a manager to promote a way of thinking

    - by John Leidegren
    This question goes beoynd just programming, but I'd like to get some input on this, if that's okay with the community. Preferably from people that do a lot of coding themselves but also manage other people coding. My problem is this. We have all these ideas that we know is good for the overall strategy of the company and the problem is not figuring out what to do, it's to come about this change. Just telling someone to do things differently isn't enough and it's hard to promote a mind set that is shared within all of the company, (this will take time). If I could jump forward I'd like it if we could create a very nurturing company culture that promotes these ideals cross all areas but I'm not sure what tools to use. And by tools I mean anything I'm legally permitted to do. e.g. we could talk about, we could arrange traning sessions, we could spend more time in meeting (talk about it more), we could spend more time designing, we could spend more time pair-programming, we could add/remove incentive or we could encurage more play. Ultimately if we did all of these things what will be the recurring theme that ties this together. I'd like to be able to answer the question -- why should we do things like this? -- and come up with an answer that explains how important it is to think about our ideals from begining to end. I've puposly avoided to talk about or specifics of the situtation becuase I believe that it narrows things down too much. But I guess, by know you either know how to answer this question or you're as confused as I am ;) I'd love to hear from people who had to bring about a change in order to go from chaos to order, or fix something in the organization which wasn't working. And I'd like to hear it from the perspective of the developer and designer. -- or -- You could simply weigh in on what are the most important qualities in an organization encurage or stimulate rigid fun development cycle from start to finish?

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  • Best way to simulate a domain?

    - by John Isaacks
    I am going to build a website on a test server that will behave differently depending on which domain is used to access it (The real website will have multiple domains pointing to it). But how will I be able to simulate the different domains on the test server?

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  • jQuery remove SELECT options based on another SELECT selected on change and on load

    - by John Sieber
    I'm using the following jQuery code to remove options from a select and it is working well. But instead of it only executing when the theOption2 select is changed I would also like it to work when the page is loaded depending on the selected item that is selected. I tried using the a copy of the script and changing the .change to .load and also tried using (window).load without the desired results. Essentially, I need the script to execute on change of the Options1 and on the loading of the page. Any help with this would be greatly appreciated. <script type="text/javascript"> $(document).ready(function() { //copy the second select, so we can easily reset it var selectClone = $('#theOptions2').clone(); $('#theOptions1').change(function() { var val = parseInt($(this).val()); //reset the second select on each change $('#theOptions2').html(selectClone.html()) switch(val) { //if 2 is selected remove C case 2 : $('#theOptions2').find('option:contains(c)').remove();break; //if 3 is selected remove A case 3 : $('#theOptions2').find('option:contains(a)').remove();break; } }); }); </script> <select id="theOptions1"> <option value="1">1</option> <option value="2" selected="selected">2</option> <option value="3">3</option> </select> <br /> <select id="theOptions2"> <option>a</option> <option>b</option> <option>c</option> </select>

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  • How deep are your unit tests?

    - by John Nolan
    The thing I've found about TDD is that its takes time to get your tests set up and being naturally lazy I always want to write as little code as possible. The first thing I seem do is test my constructor has set all the properties but is this overkill? My question is to what level of granularity do you write you unit tests at? ..and is there a case of testing too much?

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  • Can you use Win32 GUI in a browser plugin?

    - by John
    Of course it would mean you're plugin is not cross-platform but let's focus on the technical side... Is a browser plugin (like done in NPAPI) restricted in what it can do? Or do you get fairly free reign to access the PC and the render-window you're given? For instance can you create Win32/MFC controls in your browser this way? A side question - is your browser plugin conceptually akin to a .DLL, which is therefore just arbitrary compiled code implementing a specific interface for browser control/communication?

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  • What's the Flash equivalent of FlexEvent.CREATION_COMPLETE

    - by John
    I'm moving some Flex classes to pure Flash/AS3 to be part of a shared library. I have an event listener on FlexEvent.CREATION_COMPLETE to create and add display-objects once things are running, but I don't know the right way to do this in Flash? edit: Maybe if my class subclasses Sprite rather than a Flex class, I can add children in the constructor, I don't need to wait for a "construction complete" event?

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  • How to display only selected data in combo box at run time from database?

    - by Joy1979
    I am new to .Net and I am working on one task. Below is my scenario. I have 2 tables: Table 1: Students StudentID StudentDetail 1 StudentName 2 StudentGrade Table 2: Student_data StudentDetail StudentRecords StudentName John (Default) StudentName Jacob StudentName Smith StudentGrade A (default) StudentGrade B StudentGrade C Question: When window form loads (run time) I need to display StudentRecords in combo box with StudentName = "John" and StudentGrade = "A" as default followed by other values. StudentName and StudentRecords are in Labels and values are in a ComboBox. I am using VB.Net and VS 2010 with SQL 2008r2. I would appreciate any step by step help. Apologies If my request is simple.

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  • visual studio qt5 plugins not working on release

    - by John Smith
    I'm got this project where i'm showing images with a qt5 interface, i'm simply setting the Pixmap of a label with the qimage pixmap The thing is, it's working on a debug build, but not on a release build and i dont understand why. I already got a folder in my .Exe folder named "plugins" and a subfolder in it named "imageformats", and in this folder the file named "qjpeg.dll" So i coming here to see if someone has an idea on why it doesn't work ? Thanks in advance !

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  • A web application that uses someone else's mail server?

    - by John
    I'm building a web application, call it http://mywebapp.com, where a user should be able to create a newsletter and email it to everyone in his user account's contact list. So he can check mark all his friends, select an html template, fill in the body content, and send. The only catch to this is that after the user sends the email, the recipient must NOT be allowed to trace the source of the email back to http://mywebapp.com. The reason for this condition is because the user is a "reseller" of my business who wants to appear as if he's an independent business. If liability issues arise due to the reseller's unduly usage, I do not want to be caught up in the legal issues. Hence, I do not want anything about my business or technology to be traceable back to me by newsletter recipients. What's the best way to achieve this?

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