Develop Reference

JFreeChart: how to move Y-axis from left to right hand side?

I use JFreeChart to create a candlestick chart. The horizontal axis is a DateAxis to indicate the time, the vertical axis is a NumberAxis, to indicate the price. As the screenshot shows, is the price axis shown on the left hand side of the chart.
I would like the vertical axis to be displayed on the right hand side of the chart, instead of the left hand side. I have been looking in the class overview for NumberAxis, ValueAxis and Axis classes in JFreeChart but could not find a method which can make this modification.
Can somebody please show me how to make this change?

As shown here, you can use the XYPlot method setRangeAxisLocation() to set the location of the primary range axis. The image below illustrates the effect of the following addition to this example:
chart.getXYPlot().setRangeAxisLocation(AxisLocation.TOP_OR_RIGHT);

How to set a margin on a ValueAxis with auto-calculate disabled?

I'm using JFreeChart for displaying charts in PDF with Apache PdfBox.
My problem is this: I have a Scatter Plot Chart (image attached) that has fixed lower and upper bound, so auto-calculate is not an option. The chart displays a blue dot with the result. However, if the value of dot is 0 or 2 (edge values), the dot is cut out, so I need to set up a margin in this case. I tried with xAxis.setUpperMargin, but with no luck.
This is part of the code:
NumberAxis xAxis = (NumberAxis) xyPlot.getDomainAxis();
double tickSize = maxValue > 10 ? 1 : 0.5;
xAxis.setTickUnit(new NumberTickUnit(tickSize));
xAxis.setRange(1, maxValue);

As you have observed, a "margin is added only when the axis range is auto-calculated—if you set the axis range manually, the margin is ignored." Alternatively, you can add a suitable margin when manually setting the range. Starting from this example, the following change to adjustAxis() adds a 10% margin to each end of each axis, producing the result shown.
axis.setRange(-1.1, 1.1);

Remove an axis from JavaFX Chart

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);

setting up the same length of ValueAxis with jfreechart

I am plotting several jfree charts in one window and want to align all chart.
All graph have the same range for x-axis and y-axis is displaying in the left.
However, when I am trying to set up fixed length for valuesAxis ,each graph still having different length of valueAxis.
There is extract of my code;
ValueAxis rangeAxis = plot.getRangeAxis();
rangeAxis.setFixedDimension(40);
rangeAxis.setFixedAutoRange(40);
For time being I solved it by not displaying it at all
rangeAxis.setVisible(false);
Is these same way to set up the same length for all charts?

Consider using either a CombinedDomainXYPlot or a CombinedRangeXYPlot to display your data; both will ensure the data area is the same size for all their subplots (AFAIK).

JFreeChart: bar overlaps y-axis

I am using JFreeChart to generate bar charts. Everything is working find, but I have one very minor issue: the left side of the bar is overlapping the y-axis. I would prefer to have the bars sticking (but not overlapping) to the axis. If my description is unclear: everything would be perfect if the bars move 1 pixel to the right.
At first I thought the bar's stroke was the problem, but disabling the stroke gives the same problem.
Edit: The image is zoomed in at the problem area. The blue areas are the bars, and I would like the axis (the gray line) to be drawn on top, and not below.

It looks like a CategoryPlot, so you should have a CategoryDomain as the x-axis (Numeric as y) as the plot area so you'll need to set the margins (as a percent of axis) for the CategoryDomain that you've defined as the x-axis. I used this feature in a CombinedRangeCategoryPlot something like this:
CombinedRangeCategoryPlot plot = new CombinedRangeCategoryPlot(numberAxis);
CategoryAxis domain = new CategoryAxis();
domain.setLowerMargin(0.2);
domain.setUpperMargin(0.2);
plot.add(new CategoryPlot(data, domain, null, renderer));
see documentation: http://www.jfree.org/jfreechart/api/javadoc/org/jfree/chart/axis/CategoryAxis.html#setUpperMargin(double)

It looks like you may want to invoke setBase() on your BarRenderer. You'll probably have to adjust the value empirically.
BarRenderer renderer = (BarRenderer) plot.getRenderer();
renderer.setBase(0.01);