I've been googling my for a while now, and did not find any useful stuff, so that is why I ask you guys.
Can I draw mathematical functions (e.g. sine, cosine, etc.) with JFreeChart?
Thanks
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Yes, I believe that you can do this. What does the JFreeChart documentation tell you about this?Hovercraft Full Of Eels– Hovercraft Full Of Eels2012-05-07 20:45:23 +00:00Commented May 7, 2012 at 20:45
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1Yes you can - not sure if it is built in but you just need to create an XY series (with y = cos(x) for example) and draw it. Where are you stuck?assylias– assylias2012-05-07 20:48:49 +00:00Commented May 7, 2012 at 20:48
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Well, not much. This is my problem in fact: I did not find any helpful stuff in the reference.overbet13– overbet132012-05-07 20:48:58 +00:00Commented May 7, 2012 at 20:48
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I couldn't figure out how to create a graph of some mathematical functions. But this XY series seems to help me. Thanks.overbet13– overbet132012-05-07 20:51:32 +00:00Commented May 7, 2012 at 20:51
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3 Answers
JFreeChart is for plotting data, not functions. But you should be able to create a table of (x,y) values and then plot them. If this is for a desktop app, look at the JavaFX api. The API includes charts and functions to draw lines.
Comments
Im assuming that you can plot the points yourself in which case you would simply evaluate the mathematical function for each x along the graph.
getY(float x) {
return /*your function*/ Math.sin(x);
}
Comments
There may not be a built in way to plot sinx but there doesn't need to be. Remember that what your saying is y=sin(x)! What you need to plot is the x and y value. Create a loop of x values then plug them into sin(x) using Java and Math. That answer IS your y value! So now you have your x and y values to plot sin(x).
Example
final XYSeries series1 = new XYSeries("First");
for(double i = 0; i < 10; i += 0.2){
double sinx = Math.sin(i);
series1.add(i, sinx);
}
final XYSeriesCollection dataset = new XYSeriesCollection();
dataset.addSeries(series1);
