Topics by gunjannigam

Can anyone suggest a open source llibrary for plotting 3D graphs . More precisely dynamic graphs. I was using jfreechart but that is only for 2D plots. I need a library so that I can plot 3D graphs.............

I am attaching my complete code, which I was currently developing. I am not able to get why doesn't my KeyListener work. None of the KeyListener events are fires on pressing the keyboard. Please have a look and tell me the flaws in my code [ATTACH]22414[/ATTACH]

In my application, I have to draw 25 images of 700*500 pixels. I am trying to use ImageIO.read() method, which is called by creating another Thread. Its taking too much time to read images. I thought since i am calling the image read functions by creating another thread my another …

I want to have two textfields which will have the following validations 1) Both should be Integers 2) The value in one textfield should be a integer multiple of other I have used two JFormattedTextFields to this. This is what i have done till now [CODE] NumberFormat updateFormat,sampleFormat; updateFormat = …

I have written a code which uses RXTX Serial API for communication. Now I want to distribute a jar file for my program. The problem is that since I have used RXTX Serial API jar & dll files for this needs to be copied in java home. I wrote a …

I need yo draw a shape as attached in the image using Java graphics. I am struggling with the curve part. The curve part is a arc of an circle whose radius and center is known. But I have to paint the region out side of that arc. How will …

I have to draw a Circular gauge using Java Graphics. Somewhat similar to the attached image, the circular gauge without the black border as in image. I tried to use two methodologies but none of them is working perfectly Firstly, I tried to draw everything using Java Graphics and then …

I have a php page, which has different forms. One of my forms contains a table of data. I want only this form (not the complete page) to be updated in a fixed period of time. How could I do this?

Hi, I am a novice programmer at PHP. I want to redirect my webpage to another webpage. The problem is that First I want to output a file as an attachment and then redirect the web page I have used this code to output the attachment file [CODE] header("Content-Disposition: attachment; …

I have saved generated an image using a byte[] by using [CODE]Toolkit.getDefaultToolkit().createImage(image);[/CODE] where image is a byte[]. The image generated by this is of java.awt.Image instance. Now I want to save this image into my local hard disk as JPEG (the image was decoded as JPEG). How would I do …

I have a database hosted at a remote location. I want to access that database. But I keep getting the error [CODE] com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Access denied for user 'username'@'%' to database 'db' [/CODE] This is the code that i have written [CODE] Connection con = null; Class.forName("com.mysql.jdbc.Driver"); String username = "username"; …

When we use File.getAbsolutePath() we get the path of file as C:\BlahBlah\Blah.txt. But I want the path name as C:/BlahBlah/Blah.txt i.e instead of backward slash "\" i want a forward slash "/" in the path. How to get this. I tried to create a parsefile method. [CODE] public String parsePath(String …

I am writing some data to a file using FileWriter and BufferedWriter. I want that while writing in the file if somebody else wants to open the file in MS Excel, it should open only in read only mode Here is a snippet of my FileWriter and BufferedWriter [CODE] while(true) …

Is it possible to access a TCP server running outside our LAN through internet? I thought we could use the router IP Addess(which I got from whatismyip.com) in the class Socket Constructor[CODE] Socket(InetAddress address, int port) [/CODE]. But client wasn't able to find the server. Has anybody successfully achieved this …

I have a class which extends JPanel and implements ActionListener. I am having 2 menuItem. When I implemented the abstract method actionPerformed(ActionEvent e) and used repaint if the event source are the menuItem paint method is not called. What can be the possible reasons? This is what I am doing …

Hi, I need a charting API which can plot static Line Graph for 300 million points. API should support zooming and panning of axes comfortably after plotting 300 million points. I tried with JFreechart but the result is not good for even 100 million points. Does anybody have any Idea …

How to draw a circluar arc of given radius say 20 passing from two Given points. I have seen the function Arc2D.Float but can figure out how to find the required parameters for the contructor and also for QuadCurve2D cant figure out the control point.

I have drawn a cirlce and 2 line which intersects the circle using 2D Graphics. Now I want to draw an arc between the intersection point. The attached pic can show very clearly wht i want. The black portion is drawn. The red part is to be drawn. The radius …

I have a file which is already written till some lines. I have a blank line at the start of the file and I want to write in that line using Java. I thought creating a FileWriter object by using FileWriter(filename, true) and then a BufferedWriter object will start writing …

I am trying to read from a text file which of size 1 MB, and contains 5000 lines of data. Following is the code of class which I am using to read from the file [CODE] public class PlayFile extends Timer implements ActionListener{ File filename; BufferedReader out; //float frameid,prev_frameid; public …

I want to draw a battery meter. For this I am painting my panel with Filled Rectangles using AWT Graphics class. Is it possible that I can add a tooltip so that whenver a mouse is pointed on the top of the rectangle a text is displayed(which will be the …

I needed to draw an image and paint a needle on it. Since my image is stationary(it doesnt change) I dont want to paint it each time I call repaint. Thats why I thought of using JLabel with an Icon image. The problem is I cant paint anything on top …

I want to create a custom NumberFormat which returns empty string for negative values and the double number iteslf for +ve and zero values. Please guide me....................