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color fade animation for grid cells in swing amit ofer25-Mar-11 5:30 amit ofer 25-Mar-11 5:30  hi, I'm doing a path-finding project as part of my 4th year software engineering degree. we're suppose to give visual representation to a bunch of multi-agent pathfinding algorithm. the simplest one is A* adapted for multiagents. anyway our environment is a grid map where every cell can be either blocked or used as part of an agent's path. what i wanna do is use animation to give a good representation of the final movement of the agent, but animating color change in my grid. i.e paint every step in the path for a second or so with some color to show how the agent moves. and the other thing i wanna do is to represent the way the algorithm works by painting the changes in the open list and closed list of the A* algorithm while its doing its calculation. I'm using an adapted version of the observer design pattern to send events from my algorithm layer to my controller and gui layer. what i wanna do in the gui layer is everytime a tile is added to the open list, i want to have that cell painted in some color and then have it fade away according to a predefined timer or maybe later add a slider to control this timer. I looked at the code here: http://www.java2s.com/Code/Java/2D-Graphics-GUI/Colorfadinganimation.htm. it seems pretty simple, the problem is that every tile animation has to be independent of the others to allow the algorithm and everything to keep running and different animations to start. so whats the best way to achieve the results i'm looking for? should i just open a different thread for each animation or have a pre-made thread for each cell. would that be an over kill for the application, since there can be up to 1000 cells and therfore close to 1000 threads performing animation. another issue i think i might encounter is the fact that it might happen that a cell will start its color fading animation and then will have to restart and i don't want the two animations to go at the same time (only one thread performing animation for the same cell at the same time). I hope i was clear enough with what i'm trying to achieve, if someone has any ideas or thought it could really help me with my project. thanks in advanced Amit Ofer Gluing JLabels to a contentPane kurt124-Mar-11 12:30 kurt1 24-Mar-11 12:30  Hi All, I have created a contentPane of 1600 x 1600. On this contentPane i am using JLabels attached to JPanels to show images. I have set the contentPane layoutmanager to null so i can place the JPanels where i want. E.g I want to place a JPanel off the screen so my player sprite can walk towards it and then the JPanel becomes visible as it enters the screen. My probelm is that the JPanels are getting placed and showing on the initial screen but when my player sprite moves in a direction (lets say right) the JPanel also moves with the player sprite as the screen moves. How can i glue the JPanel to a fixed position? I have tried various layout managers but this also does not work. Kurt Re: Gluing JLabels to a contentPane JP_Rocks27-Mar-11 1:07 JP_Rocks 27-Mar-11 1:07  here is your answer[^] using scroll in java GUI williamroma23-Mar-11 2:23 williamroma 23-Mar-11 2:23  hi (SORRY FOR MY BAD ENGLISH) i am trying to make a GUI java . it containes many textarea but the number of textarea is defiend in the run time how can i built a panel that uses scorll , what every the number of textarea i have the panel should not make an exception thank you all Re: using scroll in java GUI TorstenH.23-Mar-11 3:46 TorstenH. 23-Mar-11 3:46  the textarea needs to have the focus. In this case, if you create the textarea at runtime, you need to click the textarea to give it the focus. If i consider right, there's no further action to be taken. The scrolling is up to a JScrollPane. Using Text Components @ oracle Tutorials[^] How to Use Text Areas @ oracle Tutorials[^] TextArea Code Examples @ java2s[^] this time verified links regards Torsten I never finish anyth... How can we call c++ functions by using java code sankardunga21-Mar-11 1:09 sankardunga 21-Mar-11 1:09  Dear sir, I have collection of c++ classes,I want use them into my java application. What is the best method to do this. regards sankar Re: How can we call c++ functions by using java code Richard MacCutchan21-Mar-11 2:59 Richard MacCutchan 21-Mar-11 2:59  You need to use the Java Native Interface[^]. I must get a clever new signature for 2011. Re: How can we call c++ functions by using java code jschell21-Mar-11 7:52 jschell 21-Mar-11 7:52  Besides JNI you can also do the following. 1. Wrap your C++ code in a executable 2. provide a communications interface (such as sockets) 3. Run/manage the the executable via Runtime.exec() and communicate with it via the communications api. The advantage to this over JNI is that it is easier to debug and the native code cannot crash the java VM. Re: How can we call c++ functions by using java code Richard MacCutchan21-Mar-11 8:51 Richard MacCutchan 21-Mar-11 8:51  I was involved in a commercial product that used this design model and it really was nothing but pain. In the end our management canned the whole thing because the outside company that did the bulk of the development could never get it to work properly. I must get a clever new signature for 2011. Re: How can we call c++ functions by using java code jschell22-Mar-11 8:04 jschell 22-Mar-11 8:04  I worked with a senior developer that could not manage to produce a design document after three tries. On a very simple project. And before the third try I had basically outlined the document in detail to him. Re: How can we call c++ functions by using java code Richard MacCutchan22-Mar-11 8:21 Richard MacCutchan 22-Mar-11 8:21  Yes, there's no shortage of seniors like that in my experience. I must get a clever new signature for 2011. TIME in java williamroma20-Mar-11 0:38 williamroma 20-Mar-11 0:38  hi for all (SORRY FOR MY BAD ENGLISH)first: i thank you all i am always ask you and you always help me really thank you second:i want to make a program in java and after a one minute i want the program to pring anything how can i use the time to make it thank you all Re: TIME in java Richard MacCutchan20-Mar-11 5:04 Richard MacCutchan 20-Mar-11 5:04  Try Google and enter "Java Time" or "Java Elapsed Time" as your search keys. You will then find lots of references to classes and methods that can help you. I must get a clever new signature for 2011. Re: TIME in java TorstenH.20-Mar-11 7:39 TorstenH. 20-Mar-11 7:39  Time flies like an arrow - fruit flies like banana Time is measured in "ticks". Refer to the class Date[^] for further information. It is explained very well there. regards Torsten I never finish anyth... Re: TIME in java Luc Pattyn20-Mar-11 11:31 Luc Pattyn 20-Mar-11 11:31  The Java Thread class[^] has a sleep() method which suspends the thread for the specified time span. That could be all you need (it really depends on your requirements, if the app has a GUI, you need either some timer or a separate Thread; if there is no GUI, no activity while waiting at all, then sleep suffices). Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code. Re: TIME in java shi-fj31-Mar-11 4:34 shi-fj 31-Mar-11 4:34  that's right,Thread. from china Re: TIME in java CodingLover22-Mar-11 18:38 CodingLover 22-Mar-11 18:38  Do you want to print the results repeatedly? If so read more about Threads. Did you tryout anything yet? I appreciate your help all the time... CodingLover Re: TIME in java williamroma23-Mar-11 2:20 williamroma 23-Mar-11 2:20  hi (SORRY FOR MY BAD ENGLISH) i thank you all i have solved the problem realy thank you all now i have some new problems , i try to solve it Re: TIME in java CodingLover23-Mar-11 18:57 CodingLover 23-Mar-11 18:57  Good luck then I appreciate your help all the time... CodingLover J2EE Enterprise Application future383919-Mar-11 16:05 future3839 19-Mar-11 16:05  hi, could you please introduce me a good reference regarding starting how to start or tutorial regarding J2ee Enterprise application. thxx Re: J2EE Enterprise Application Richard MacCutchan19-Mar-11 22:22 Richard MacCutchan 19-Mar-11 22:22  It's all on the Java Website[^]. I must get a clever new signature for 2011. Re: J2EE Enterprise Application TorstenH.20-Mar-11 7:40 TorstenH. 20-Mar-11 7:40  Check this: Vogella on Eclipse RCP[^] regards Torsten I never finish anyth... Re: J2EE Enterprise Application David Skelly20-Mar-11 23:18 David Skelly 20-Mar-11 23:18  Are you sure that's the right link? It looks more like a tutorial on how to build desktop applications with the Eclipse RCP rather than how to build a JEE enterprise application. I haven't read it all the way through, that's just based on a quick glance, but I didn't see any mention of anything that I would expect to see in a discussion of JEE (servlets, EJBs, persistence, JDBC, and all that gubbins). Re: J2EE Enterprise Application TorstenH.22-Mar-11 1:36 TorstenH. 22-Mar-11 1:36  *cough* OK, men are not capable to do 2 things at a time...proven one more time! Ebooks on J2EE[^] THIS was the link I wanted to show here. Now I should check the other website and hope there is not one reading books he does not really need regards Torsten I never finish anyth... Re: J2EE Enterprise Application RaviRanjanKr5-Apr-11 2:58 RaviRanjanKr 5-Apr-11 2:58  Check given links Link1[^] Link2[^]

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