JFreeChart:条形图 X 轴标签与大型数据集重叠
JFreeChart: Bar chart X axis labels overlapping with large datasets
我在使用 JFreeChart 创建具有相对较大数据集的条形图时遇到以下问题:
使用重叠的 X 轴标签生成的条形图。我试过将标签垂直放置,但仍然无济于事。请提供解决此问题的最佳方法。代码片段如下:
CategoryDataset categoryDataSet = getBarDataset();
JFreeChart barChart = ChartFactory.createBarChart("TITLE", "X-LABEL","Y-LABEL", categoryDataSet, PlotOrientation.VERTICAL, true, true, false);
barChart.getCategoryPlot().getDomainAxis().setCategoryLabelPositions(CategoryLabelPositions.UP_90);
barChart.getCategoryPlot().getDomainAxis().setMaximumCategoryLabelLines(4);
jpg = Image.getInstance(im, null);
document.add(jpg);
更新:
根据@trashgod 的建议,我使用了从 0 到列数的 SlidingCategoryDataset 索引。当列数很大(此处为 50)时,X-Label 会重叠。当列数设置为较低的数字时,它工作正常。我想找到大列大小的解决方案。重要的是,我需要将图表图像导出为 pdf。请帮助我找到一个可行的解决方案。谢谢!
private static void createBarChart() throws DocumentException, IOException {
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(FILE_LOCN));
writer.setStrictImageSequence(true);
document.open();
CategoryDataset categoryDataset = createDataset();
int colCount = categoryDataset.getColumnCount();
SlidingCategoryDataset slidingCategoryDataSet = new SlidingCategoryDataset(categoryDataset, 0, colCount);
JFreeChart barChart = ChartFactory.createBarChart("TITLE", "X-LABEL","Y-LABEL", slidingCategoryDataSet,
PlotOrientation.VERTICAL, true, true, false);
barChart.getCategoryPlot().getDomainAxis().setCategoryLabelPositions(CategoryLabelPositions.UP_90);
barChart.getCategoryPlot().getDomainAxis().setMaximumCategoryLabelLines(4);
java.awt.Image im = barChart.createBufferedImage(400, 400);
Image jpg = Image.getInstance(im, null);
jpg.scaleToFit(400, 400);
document.add(jpg);
document.close();
writer.close();
}
private static CategoryDataset createDataset() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
for (int i = 0; i <= 50; i++) {
dataset.addValue(i, "R", "C" + i);
}
return dataset;
}
分类较多时,支持setCategoryLabelPositions()
is a good choice for maximizing legibility. Arbitrary CategoryLabelPositions
指定竖向标签
在交互式图表中,SlidingCategoryDataset
, mentioned here, allows your application to set the count and starting index of visible categories as desired, perhaps using a slider or spinner, as shown here。
How can I achieve this in a PDF?…More pixels seems a good idea, but how can we implement that here?
在具有给定数量的类别的固定大小的上下文中,您可以通过 createBufferedImage()
, as shown here, or Image.scaleToFit()
优化图表图像的大小。对于更大的数据集,可以以特定领域的方式创建多个链接图表,例如按年份或子公司。
我在使用 JFreeChart 创建具有相对较大数据集的条形图时遇到以下问题:
使用重叠的 X 轴标签生成的条形图。我试过将标签垂直放置,但仍然无济于事。请提供解决此问题的最佳方法。代码片段如下:
CategoryDataset categoryDataSet = getBarDataset();
JFreeChart barChart = ChartFactory.createBarChart("TITLE", "X-LABEL","Y-LABEL", categoryDataSet, PlotOrientation.VERTICAL, true, true, false);
barChart.getCategoryPlot().getDomainAxis().setCategoryLabelPositions(CategoryLabelPositions.UP_90);
barChart.getCategoryPlot().getDomainAxis().setMaximumCategoryLabelLines(4);
jpg = Image.getInstance(im, null);
document.add(jpg);
更新: 根据@trashgod 的建议,我使用了从 0 到列数的 SlidingCategoryDataset 索引。当列数很大(此处为 50)时,X-Label 会重叠。当列数设置为较低的数字时,它工作正常。我想找到大列大小的解决方案。重要的是,我需要将图表图像导出为 pdf。请帮助我找到一个可行的解决方案。谢谢!
private static void createBarChart() throws DocumentException, IOException {
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(FILE_LOCN));
writer.setStrictImageSequence(true);
document.open();
CategoryDataset categoryDataset = createDataset();
int colCount = categoryDataset.getColumnCount();
SlidingCategoryDataset slidingCategoryDataSet = new SlidingCategoryDataset(categoryDataset, 0, colCount);
JFreeChart barChart = ChartFactory.createBarChart("TITLE", "X-LABEL","Y-LABEL", slidingCategoryDataSet,
PlotOrientation.VERTICAL, true, true, false);
barChart.getCategoryPlot().getDomainAxis().setCategoryLabelPositions(CategoryLabelPositions.UP_90);
barChart.getCategoryPlot().getDomainAxis().setMaximumCategoryLabelLines(4);
java.awt.Image im = barChart.createBufferedImage(400, 400);
Image jpg = Image.getInstance(im, null);
jpg.scaleToFit(400, 400);
document.add(jpg);
document.close();
writer.close();
}
private static CategoryDataset createDataset() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
for (int i = 0; i <= 50; i++) {
dataset.addValue(i, "R", "C" + i);
}
return dataset;
}
分类较多时,支持setCategoryLabelPositions()
is a good choice for maximizing legibility. Arbitrary CategoryLabelPositions
指定竖向标签
在交互式图表中,SlidingCategoryDataset
, mentioned here, allows your application to set the count and starting index of visible categories as desired, perhaps using a slider or spinner, as shown here。
How can I achieve this in a PDF?…More pixels seems a good idea, but how can we implement that here?
在具有给定数量的类别的固定大小的上下文中,您可以通过 createBufferedImage()
, as shown here, or Image.scaleToFit()
优化图表图像的大小。对于更大的数据集,可以以特定领域的方式创建多个链接图表,例如按年份或子公司。