Create graph from data in text file

[Wrathchild]

Is it possible for me to read in data from a text file via a buffered reader, then graph that data? I can do the first part, but need help with the graphing.

thanks!

 

[stefanwagner]

What kind of data and what kind of graph?
What do you have so far?

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[sedj]

Have a look at the JFreeChart API, its very good.

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[Wrathchild]

thanks guys, I'm just looking to graph some numbers, nothing fancy, just for a project at school.

I don't have anything written yet, but I've read data in from a text file before so I can just reuse that part.

 

[prosper]

JFreeChart is good but it is difficult for beginner.
It uses Swing and the program is difficult to trace.

 

[Bong]

Not that I'm a great Java programmer but I did a little thing like you're describing. In my case, I wanted to graph some X,Y data from a comma-separated-values text file (where each line in the file is x,y). I graph the values with "x"s and compute a linear least squares and plot that line (as a line). Alternatively, I suppose you could plot the lines between the "x"s as lines.

The whole code is a little long (275 lines) and of no interest to anyone on this forum but I'd be happy to send it to you. I only use AWT classes as I use this app. on a PDA, so it's pretty basic. The salient features, after computing the scales (so it fits on the canvas) are:

a canvas
c1 = new Canvas();
a graphics class
private static Graphics g1;
g1 = c1.getGraphics();
and draw a string or draw a line
g1.drawString("x",(int)x2,chgt-6-(int)y2);
g1.drawLine((int)x1,chgt-6-(int)y1,(int)x2,chgt-6-(int)y2);



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Bob Rashkin