JFreeChart

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There is still (JFreeChart 1.0.9) a major problem with label cuttings.
Also ItemLabels get cut at the borders. See
http://www.jfree.org/phpBB2/viewtopic.php?t=23636&sid=8b8ba5aa9e95834c7c661495bcfaee77

Here's a test version with a workaround I've found. It's ugly but at least
the labels don't get cut anymore (hopefully for most cases ...). The fix is
disabled by default - so compare it by simply toggle the "if (false) {"
line:


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/**
* This test shows that a bar label gets cut by the plots top border
when no explicit margins are set and the bar is "too high" for the label.
* (E.g. for percentage charts 0% to 100%). The resulting chart is
displayed in ChartPanel within a 300x400 JFrame.
*
* @return JFreeChart.
*/
private JFreeChart testBarLabelCut() {
JFreeChart result = null;

final int indexSeries = 0;
final DefaultCategoryDataset cd = new DefaultCategoryDataset();
cd.addValue(864.4, "Series "+indexSeries, "Category1");
cd.addValue(-709.7, "Series "+indexSeries, "Category2");

result = ChartFactory.createBarChart("Bar Chart", "Categories",
"Values", cd, PlotOrientation.VERTICAL, false, false, false);

final CategoryPlot plot = result.getCategoryPlot();
final ValueAxis va = plot.getRangeAxis();
final CategoryItemRenderer renderer = plot.getRenderer();
final CategoryItemLabelGenerator generator = new
StandardCategoryItemLabelGenerator("{2} %", NumberFormat.getInstance());
renderer.setSeriesItemLabelGenerator(indexSeries, generator); //0
= 1st series
renderer.setSeriesItemLabelsVisible(indexSeries, true);
renderer.setSeriesPositiveItemLabelPosition(indexSeries, new
ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BOTTOM_CENTER,
TextAnchor.CENTER, 0));

if (false) { //enable fix?
//****************** fix label cutting:
*******************************************************
if (renderer.isSeriesItemLabelsVisible(indexSeries)) {
//some production attributes to set:
final boolean includeZero = true; //we want full bars
final double chartHeight = 300;
final Font font = new Font("Helvetica", Font.PLAIN, 6);

//start of fix:
double min =
DatasetUtilities.findMinimumRangeValue(cd).doubleValue();
double max =
DatasetUtilities.findMaximumRangeValue(cd).doubleValue();
if (includeZero) {
min = 0 < min ? 0 : min;
max = max < 0 ? 0 : max;
}
double r = max - min; //full range from min to max

final double f = font.getSize() / chartHeight; //margin %
final double margin = (0.1 + f) * r; //10% + font size of
full range
double marginTop = 0.0;
double marginBottom = 0.0;
if (max > 0) { //positive labels?
marginTop = margin;
}
if (min < 0) { //negative labels?
marginBottom = margin;
}

va.setRange(min - marginBottom, max + marginTop);
}//else: item labels unvisible => no fix required
}

return result;
}//testBarLabelCut()
------------------------------------


File Added: screenshot.png

Still doesn't work with JFreeChart 1.0.6:


/**
* This test shows that a bar label gets cut by the plots top border
if a fixed range is used without margins and the bar is "too high" for the
label.
* (E.g. for percenatge charts 0% to 100% you don't want margins but
an exact range axis from 0% to 100% and not wider.)
*
* @return JFreeChart.
*/
private JFreeChart testBarLabelCut() {
JFreeChart result = null;

DefaultCategoryDataset cd = new DefaultCategoryDataset();
cd.addValue(50.3, "Series1", "Category1");
cd.addValue(99.99, "Series1", "Category2");

result = ChartFactory.createBarChart("Bar Chart", "Categories",
"Values", cd, PlotOrientation.VERTICAL, false, false, false);

CategoryPlot plot = result.getCategoryPlot();
plot.getRangeAxis().setUpperMargin(0.0);
CategoryItemRenderer renderer = plot.getRenderer();
CategoryItemLabelGenerator generator = new
StandardCategoryItemLabelGenerator("{2} %", NumberFormat.getInstance());
renderer.setSeriesItemLabelGenerator(0, generator); //0 = 1st
series
renderer.setSeriesItemLabelsVisible(0, true);
renderer.setSeriesPositiveItemLabelPosition(0, new
ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.CENTER,
TextAnchor.CENTER, 0));

return result;
}//testBarLabelCut()
File Added: screenshot.png