Develop Reference

Change Plot label position in a Combined Plot JFreeChart

Is there a way to change the position of the Category Plot Labels (title) (censored with black bars in the image) to be on top of the chart and / or aligned vertically to each other?
Here's the classes I use to construct it.
var renderer = new LineAndShapeRenderer();
...
var yAxis = new NumberAxis();
...
var xAxis = new CategoryAxis(title);
...
CategoryPlot plot = new CategoryPlot(dataset, xAxis, yAxis, renderer);
...
var combinedPlot = new CombinedRangeCategoryPlot();
combinedPlot.add(plot, weight);
...
I'm using version 1.0.19 of JFreeChart since newer versions produce some visual artifacts.

There has been a misunderstanding: I meant the labels, "Plot 0" and "Plot1", in your example; and I'm asking for the ability to move them on top of the chart…
Invoke setDomainAxisLocation() on each subplot domain axis to move the axis and its label. Alternatively, obtain the required axis references from the List<CategoryPlot> shown below.
plot0.setDomainAxisLocation(AxisLocation.TOP_OR_LEFT);
plot1.setDomainAxisLocation(AxisLocation.TOP_OR_LEFT);
I only need those "Plot 0" and "Plot1" labels on top, not the tick labels…
You can hide the tick labels as desired using setTickLabelsVisible(false), and you can have multiple axes, as shown here.
To adjust the tick label orientation, invoke setCategoryLabelPositions() on each sublot comprising the combined plot. Do this either
When the plot is created.
CategoryAxis axis0 = new CategoryAxis("Plot 0");
axis0.setCategoryLabelPositions(CategoryLabelPositions.UP_90);
CategoryPlot plot0 = new CategoryPlot(…, axis0, …);
…
CategoryAxis axis1 = new CategoryAxis("Plot 1");
axis1.setCategoryLabelPositions(CategoryLabelPositions.UP_90);
CategoryPlot plot1 = new CategoryPlot(…, axis1, …);
After creating the combined plot.
CombinedRangeCategoryPlot combinedplot = new CombinedRangeCategoryPlot(…);
…
List<CategoryPlot> list = combinedplot.getSubplots();
list.get(0).getDomainAxis().setCategoryLabelPositions(CategoryLabelPositions.UP_90);
list.get(1).getDomainAxis().setCategoryLabelPositions(CategoryLabelPositions.UP_90);
Vertical labels are illustrated below.

JFREECHART line chart : Want X axis to be collection of date ranges

I am new to JFreeChart. My requirement is to display the X axis (time-axis) as following (time ranges will be configurable as per user input) for a line chart with suppose 3 variables:
3rdAug-8thAug..10thAug-15thAug.. [ and so on ]
Currently my graph's X axis is like this :
1..2..3..4..5 ..
[Unable to attach screenshots]
My demo code is as follows :
private JFreeChart createChart(final XYDataset dataset) {
// create the chart...
final JFreeChart chart = ChartFactory.createXYLineChart(
"Line Chart Demo ", // chart title
"X", // x axis label
"Y", // y axis label
dataset, // data
PlotOrientation.VERTICAL,
true, // include legend
true, // tooltips
false // urls
);
// OPTIONAL CUSTOMISATION OF THE CHART...
chart.setBackgroundPaint(Color.white);
// get a reference to the plot for further customisation...
final XYPlot plot = chart.getXYPlot();
plot.setBackgroundPaint(Color.white);
plot.setDomainGridlinePaint(Color.white);
plot.setRangeGridlinePaint(Color.white);
final XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer();
renderer.setSeriesLinesVisible(0, true); //for line visibility
renderer.setSeriesShapesVisible(1, false);
plot.setRenderer(renderer);
// change the auto tick unit selection to integer units only...
final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
// final Axis range = plot.get
rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
// OPTIONAL CUSTOMISATION COMPLETED.
return chart;
}
Can anyone point me in the right direction here?
How do I get only the required values shown on the X axis?

XYPlot differ between domain axes and range axes. In your case the X axis is the domain axis whereas the Y axis is the range axis.
Valuexis domainAxis = plot.getDomainAxis();
You can also set a different domain axis:
ValueAxis dAxis = new ...
plot.setDomainAxis(dAxis);

You want to use JFreeChart's TimeLine interface to limit the shown dates on the DateAxis (which is actually the domain-axis in your case, as already pointed out by #Uli). For your requirement the default implementation SegmentedTimeline should fulfill your requirements. Just configure it and pass it on to your axis:
SegmentedTimeline timeline = new SegmentedTimeline(
86400000l, // segment size = one day in ms (24*3600*1000)
5, // include 5 segments (days)
2); // exclude 2 segments (days)
DateAxis axis = new DateAxis();
axis.setTimeline(timeline);
And don't forget to configure the plot to use the new DateAxis, as XYPlot uses NumberAxis by default:
plot.setDomainAxis(axis);
hth,
- martin

Ranges in bar graph JFreeChart

I have created a graph with JFreeChart and I've been trying to change the ranges on the Y-axis.
I need it to go from 1 to 10, but with intervals of 1 unit. (1,2,3,...,9,10)
I haven't been able to find a way for that, can anyone help me?

Try this it will work
CategoryPlot p = chart.getCategoryPlot();
final NumberAxis rangeAxis = (NumberAxis) p.getRangeAxis();
rangeAxis.setTickUnit(new NumberTickUnit(10));
rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

JFreeChart Margin

I am using JasperReports to create a line chart for my webapps.
I have successfully passed the dataset to the compiled report (created in iReport) and can see the data correctly.
However, I want to do some customization on the margin.
The value shown on the line chart is trimming for the highest value as there is no margin.
The X-Axis label is coming after few empty space from Y-Axis 0 value. I want to remove that margin and start the X-Axis from very close to the meeting point of X & Y.
Please see the picture:
I am using customized class which is defined in my webspps. I am able to change the font size and rotation of the label but don't know how to adjust margin.
public class LineChartCustomizer implements JRChartCustomizer {
#Override
public void customize(JFreeChart jFreeChart, JRChart jrChart) {
CategoryPlot plot = jFreeChart.getCategoryPlot();
DecimalFormat dfKey = new DecimalFormat("###,###");
StandardCategoryItemLabelGenerator labelGenerator = new StandardCategoryItemLabelGenerator("{2}", dfKey);
LineAndShapeRenderer renderer = new LineAndShapeRenderer();
renderer.setBaseItemLabelsVisible(true);
renderer.setBaseItemLabelGenerator(labelGenerator);
renderer.setBaseItemLabelFont(new java.awt.Font("SansSerif", java.awt.Font.PLAIN, 4));
renderer.setSeriesShape(0, ShapeUtilities.createDiamond(1F));
plot.setRenderer(renderer);
}
}

I think* you're looking for ValueAxis#setUpperMargin(double) and CategoryAxis#setLowerMargin(double). You can get the CategoryAxis and ValueAxis from plot.getDomainAxis() and plot.getRangeAxis(). Note that the margins are a percentage of the axis length and not pixel values.
* I'm not familiar with JasperReports, but it seems a little strange that you have a CategoryPlot in hand as opposed to an XYPlot. I would have expected the chart in your picture to have used an xy time series. I have only ever tested this with an XYPlot, so I'm not entirely sure how it will behave with a CategoryPlot.

How to draw line over a JFreeChart chart?

I have updatable OHLCChart.
I need to draw a line over chart.
How to implement it?

If you want to draw a vertical or horizontal line at a given position on an axis, you can use a ValueMarker :
ValueMarker marker = new ValueMarker(position); // position is the value on the axis
marker.setPaint(Color.black);
//marker.setLabel("here"); // see JavaDoc for labels, colors, strokes
XYPlot plot = (XYPlot) chart.getPlot();
plot.addDomainMarker(marker);
Use plot.addRangeMarker() if you want to draw an horizontal line.

Something like this should work if you want to plot a line indicator (like a moving average for example):
XYDataset dataSet = // your line dataset
CombinedDomainXYPlot plot = (CombinedDomainXYPlot) chart.getPlot();
XYPlot plot = (XYPlot) plot.getSubplots().get(0);
int dataSetIndx = plot.getDatasetCount();
plot.setDataset(dataSetIndx, dataSet);
XYLineAndShapeRenderer lineRenderer = new XYLineAndShapeRenderer(true, false);
plot.setRenderer(dataSetIndx, lineRenderer);