I have a JFreeChart TimeSeries chart that has 2 data item.
I need to mark points in it.
For example I need it show at a specific time what is the line's value (while there is not actually any value and JFreeChart created line).
Example:
TimeSeries t=new TimeSeries("Test",Second.class);
Dataset.addSeries(t);
Calendar C=Calendar.getInstance();
t.add(new Second(C.getTime()), 100);
C.setTimeInMillis(C.setTimeInMillis+10*60*60*1000);
t.add(new Second(C.getTime()),200);
// Now I want Something like this psudo code
C.setTimeInMillis(C.setTimeInMillis-5*60*60*1000);
t.mark(new Second(C.getTime()));
How Can I mark points on a series by their domain value (So the range value should be calculated automatically)?
Thanks
One convenient way to show interpolated values is to enable the axis trace feature, as shown in this example.
chartPanel.setHorizontalAxisTrace(true);
chartPanel.setVerticalAxisTrace(true);
Addendum: An alternative is to add the interpolated values to the data set and suppress the display of their Shape, as shown here. The (unmarked) value will then be available to a tool tip generator, label generator, chart mouse listener, etc.
Related
Is it possible to generate a bar graph in jFreeChart where bars all start around a particular value instead of the zero axis? Our team has interest in this view.
Here is an example where the default behavior has the bars all between the value and the origin. We want the bars to be between the value and the mean (average).
I suppose a workaround is we calculate the offset from the mean and plot them in respect to the origin and then hide the axis but then we are not able to show the axis to our users.
Instead of having bar graphs stop at another value besides the origin we are just redefining the graph axis origin to be at the mean and offsetting everything. So instead of something like exposure level we now call the value axis distance from aggregate mean. Not exactly what I was originally looking in the OP but a cleaner solution overall. We'll let the user toggle between the two modes.
I am looking for a method to add a dynamic String annotation on line chart for a particular data point in JFreeChart. For an example, refer to the image below.
Now, for the given plot, let's say I want to show a marker (like small triangle symbol) and "Temperature too high" string at particular point when the temperature value crosses 100 C. Then how should I write a JavaScript which will allow me to do so? The temperature value will be fixed (i.e. 100 C) but the plot will be different depending upon different experiments (i.e. the location of datapoint will not be fixed and it will get changed since it's based on the experiment).
I've created a XYChart with numerical values different (for example temperatue with pressure) so I want to draw my own axeS just beside my chart. To do the following I've to unshow the YAxis, how should I do that ?
By using a trick: The Chart needs the Y Axis to remain in place so it knows where to render your content. You can, however, hide it. Hide the tick labels and set the axis' opacity to 0 using this code:
chart.getYAxis().setTickLabelsVisible(false);
chart.getYAxis().setOpacity(0);
The axis will still be there, but not shown.
I found that if I hid the chart using the following code:
chart.getXAxis().setTickLabelsVisible(false);
chart.getXAxis().setTickMarkVisible(false);
((Path)chart.getXAxis().lookup(".axis-minor-tick-mark")).setVisible(false);
Then I get about ~10 pixels less blank space on the bottom. IF the space was an issue for your application then you could use css offsets to correct it. This solution may have more predictable offsets.
SOLVED: I got this to work for sharing a common x-axis for two charts stacked vertically:
Create two charts, each with their own identical copy of the x-axis object, setting identical upper and lower bounds (optionally by binding).
Then hide the x-axis in the second chart like this:
chart = new LineChart<Number,Number>(xaxis2,yaxis2) {
{// hide xAxis in constructor, since not public
getChartChildren().remove(getXAxis());
// not getPlotChildren()
}
};
You'll want to set the widths of your y-axes to be the identical, e.g.
int w = 60;
yaxis.setMaxWidth(w);
yaxis.setMinWidth(w);
yaxis.setPrefWidth(w);
yaxis2.setMaxWidth(w);
yaxis2.setMinWidth(w);
yaxis2.setPrefWidth(w);
I need to add break line in some legend in JFree Chart.
I have some legends with 316 characters and need to break every 80.
Finally, I'll have 4 lines.
Anyway, I tried with "\n", "\u2424" and "
". It did nothing.
(From http://www.jfree.org/forum/viewtopic.php?f=3&t=10226 & http://www.jfree.org/forum/viewtopic.php?f=3&t=22417)
The only solution I could find (but I wished it could be avoided, since I want it to be dynamically done) is to fix a width for each legend, so it should break as I need to.
Edit : that even didn't work.
I'm using jFree Chart 0.9.20
EDIT
For the moment, with a small legend, that's what I have :
It's fine but when I have my long legends :
For that last picture, I logged my legend and break lines are here, but they don't show up with jFree Chart.
Two alternatives to consider: Given an abbreviated legend display string,
Use setLegendItemToolTipGenerator() to display the full, unbroken string as a tool tip.
renderer.setLegendItemToolTipGenerator(
new StandardXYSeriesLabelGenerator("Legend {0}"));
Use addChartMouseListener(), shown here, and forward mouse moved events over the legend to an adjacent text component.
Alright, I made it work as my client wanted.
First, you need to make a new kind of Legend, for example named MyLegend (but please, don't name it like that in the real world).
That class needs to extend Legend and implement Serializable, the same way StandardLegend does.
To be honest, I even copied/pasted the whole StandardLegend in MyLegend.
Then, you can modify the standard legend to your custom one.
For my needs, I changed :
draw() for the height and width calculation of the whole Legend group
drawSeriesElements() to split the legend's label and draw every lines one under another.
// Multi line management for Legend
String[] multiline = item.getItem().getLabel().split(System.getProperty("line.separator"));
for(int j = 0; j<multiline.length; j++) {
RefineryUtilities.drawAlignedString(multiline[j], g2,
(float) item.getLabelPosition().getX(), (float) item
.getLabelPosition().getY() + g2.getFontMetrics().getHeight()*j, TextAnchor.CENTER_LEFT);
}
createDrawableLegendItem() to calculate each item width and height.
Since, now legends are multiline, each line of one item doesn't have the same width than others. We need to find the longest one to define the item's real width.
Same goes for height. Now it's multiline, so it needs to calculate how many lines it got to know the item's real height.
Optionally, you could change drawLegendTitle() to make it multiline too.
When that class is configured as you want to, you need to apply it on your chart.
So, you do as usual :
JFreeChart chart = new JFreeChart(...);
chart.set ... // apply your series and options
MyLegend legend = new MyLegend();
legend.set... // apply your legend options if applicable
chart.setLegend(legend);
That's it.
Result :
I am creating pie charts using JFreeChart, and I want to set the value and the label seperately like in iReport. In other words, I want the chart to show different results on the pie than in the legend. Is there any way that I can achieve this?
The MessageFormat ArgumentIndex values correspond to the series name, domain and range. You can set a different generator for each series or for all series in the base.
PiePlot plot = (PiePlot) chart.getPlot();
plot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0} {1} {2}"));
Addendum: For PiePlot, the values have a slightly different meaning—series name, value and percentage—as shown here.