ticklabel in barcharts

[guest]

Hii,

In the chart, for category axis i m using the dates. When the data is small, the date tick labels are displayed correctly. But, when the data is large..the date tick labels are overlapping. Is there any way to skip some tick labels to display the dates properly in the xaxis.

My present code looks like this.

Code: Select all

		CategoryAxis categoryAxis = new CategoryAxis(getChartItems().getXAxisLabel()); 
		categoryAxis.setAxisLineVisible(true);
		categoryAxis.setTickMarksVisible(true);
		CategoryLabelPosition position = new CategoryLabelPosition( 
			RectangleAnchor.CENTER,TextBlockAnchor.CENTER, TextAnchor.CENTER, -Math.PI / 2.0 
		); 
		categoryAxis.setBottomCategoryLabelPosition(position);
		categoryAxis.setLabelFont(labelFont);
		categoryAxis.setLabelInsets(new Insets(15,5,5,5));
		categoryAxis.setTickLabelFont(tickLabelFont);
		
		plot.setDomainAxis(categoryAxis);

Can someone give ideas??

Regards,
guest

[david.gilbert]

If possible, try to use an XYPlot with a DateAxis - then you'll have more control over the labelling options.

[AdamWarlock]

Don't know if this is of any help but I am using CEWolf in a JSP page to do something similiar and I am getting the correct spacing between the various data point labels on the x aixs by doing the following...


public void processChart( Object chart, Map params )
{
CategoryPlot plot = (CategoryPlot)((JFreeChart)chart).getPlot();

// Set the colors of the four data series. 0=Inventory Target, 1=UCL, 2=LCL, 3=Inventory
CategoryItemRenderer renderer = plot.getRenderer();
renderer.setSeriesPaint(0, Color.black);
renderer.setSeriesPaint(1, Color.red);
renderer.setSeriesPaint(2, Color.red);
renderer.setSeriesPaint(3, Color.blue);

// Set the background gradient
// Paint p = new GradientPaint(0, 0, Color.white, 0, 200, Color.lightGray);
// plot.setBackgroundPaint(p);
plot.setDomainGridlinesVisible(true);

// Adjust the x-axis
HorizontalCategoryAxis x_axis = (HorizontalCategoryAxis) plot.getDomainAxis();
// x_axis.setVerticalCategoryLabels(true);
x_axis.setSkipCategoryLabelsToFit(true);
x_axis.setTickMarksVisible(true);
}

The relvant line is x_axis.setSkipCategoryLabelsToFit(true);

Hope this helps..

[phamdinhnguyen]

AdamWarlock,

This method setSkipCategoryLabelsToFit(true) is no longer available in the latest release.
I've done some scouting in this forum, and found out many developers are facing this same issue. We prefer the solution your recommend: setSkipCategoryLabelsToFit(true).
What version of JFreeChart do you use?
I assume that you didn't upgrade to the latest JFreeChart, as your codes will break?

phamdinhnguyen