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JFreeChart show one single value

I have a chart where I display the values of a table (stock and date). The stock is displayed in the y axis and the dates in the x axis.
As long as the query returns 2 entries, it is shown normally as a line, but if the query returns only one entry, nothing is shown (there should be a point there).
Any suggestions on how to fix this would be highly appreciated.
2 entries: enter image description here
1 entry: enter image description here
Code (the chart is built in an action listener):
historyButton.addActionListener(e -> {
// stock list and dates list retrieved from database
int articleNr = Integer.parseInt(articleIDText.getText());
List<Integer> displayStockHistory;
List<String> displayDatesStockHistory;
try {
displayStockHistory = business.displayStockHistory(articleNr);
} catch (Exception ex) {
throw new RuntimeException(ex);
}
try {
displayDatesStockHistory = business.displayDatesStockHistory(articleNr);
} catch (Exception ex) {
throw new RuntimeException(ex);
}
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
// add db values to the dataset
for(int i = 0; i < displayStockHistory.size(); i++){
dataset.addValue(displayStockHistory.get(i), "Articles in Stock", displayDatesStockHistory.get(i));
}
// compose chart
JFreeChart chart = ChartFactory.createLineChart(
"Stock History",
"Date",
"Stock",
dataset,
PlotOrientation.VERTICAL,
true,
true,
false);
chart.setBackgroundPaint(c2);
chart.getTitle().setPaint(c3);
CategoryPlot p = chart.getCategoryPlot();
p.setForegroundAlpha(0.9f);
CategoryItemRenderer renderer = p.getRenderer();
//renderer.setSeriesPaint(0, c4);
renderer.setSeriesStroke( 0, new BasicStroke( 5 ) );
chart.getCategoryPlot().setBackgroundPaint(c1);
ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setBackground(c2);
chartScrollPane.getViewport().add(chartPanel);
chartPanel.setPreferredSize(new Dimension(2000, 270));
ChartFrame frame1 = new ChartFrame("Line graph", chart);
frame1.setVisible(true);
frame1.setSize(500, 400);
});
}

Your chosen chart factory instantiates a LineAndShapeRenderer, so one approach is to make the renderer's shapes visible for all series, as shown here; note that the API has changed:
CategoryPlot plot = (CategoryPlot) chart.getPlot();
LineAndShapeRenderer r = (LineAndShapeRenderer) plot.getRenderer();
r.setDefaultShapesVisible(true);
To enable shapes only for series having a single, non-null value, you'll have to iterate through the data explicitly:
DefaultCategoryDataset data = new DefaultCategoryDataset();
data.addValue(3, "Data1", LocalDate.now());
data.addValue(2, "Data2", LocalDate.now());
data.addValue(1, "Data2", LocalDate.now().plusDays(1));
…
for (int row = 0; row < data.getRowCount(); row++) {
int count = 0;
for (int col = 0; col < data.getColumnCount(); col++) {
count += data.getValue(row, col) != null ? 1 : 0;
}
if (count == 1) {
r.setSeriesShapesVisible(row, true);
}
}

XYAreaChart the colors of the shapes on the chart merge

Using setSeriesPaint, I set the colors for the series: red and black. You can see the problem in the picture:
Instead of black, there is something in between black and red, because, apparently, there is an overlay on red. How to solve this problem?
TimeSeries all = new TimeSeries( "All" );
TimeSeries heal = new TimeSeries( "Heal" );
Document document = Jsoup.connect(. . .).get();
Elements h = document.select("tr");
int a = 0;
for(int i = h.size()-1;i>1;i--) {
String[] mas = String.valueOf(h.get(i).text()).split(" ");
SimpleDateFormat ft = new SimpleDateFormat ("dd.MM.yyyy");
Date da = ft.parse(mas[0]);
Day d = new Day(da);
all.add(d, Double.parseDouble(mas[10]));
heal.add(d, Double.parseDouble(mas[4]));
}
TimeSeriesCollection dataset = new TimeSeriesCollection();
dataset.addSeries(all);
dataset.addSeries(heal);
JFreeChart lineChartObject = ChartFactory.createXYAreaChart(. . .);
XYPlot plot = (XYPlot) lineChartObject.getPlot();
plot.setBackgroundPaint(Color.white);
plot.setDomainGridlinePaint(Color.black);
plot.setRangeGridlinePaint(Color.black);
DateAxis domain = new DateAxis("Дата");
plot.setDomainAxis(domain);
XYAreaRenderer movingAverageRenderer = new XYAreaRenderer();
movingAverageRenderer.setUseFillPaint(false);
movingAverageRenderer.setSeriesPaint(0, Color.red);
movingAverageRenderer.setSeriesPaint(1, Color.black);
plot.setRenderer(movingAverageRenderer);
int width = 640;
int height = 480;
File lineChart = new File( "C://gr", "graph.jpeg");
ChartUtilities.saveChartAsJPEG(lineChart ,lineChartObject, width ,height);

Color does not change for different chart datasets

XYSeriesCollection dataset = new XYSeriesCollection();
XYSeries validKoordinates = new XYSeries("Not dangerous");
for (SimulationResult sr : validSR.values()) {
validKoordinates.add(sr.getMinTTC(), sr.getMinTHW()); //x,y
}
dataset.addSeries(validKoordinates);
JFreeChart chart = chart = ChartFactory.createScatterPlot(
"Distribution of THW and TTC Values",
"TTC", "THW", dataset);
//Changes background color
XYPlot plot = (XYPlot) chart.getPlot();
plot.setBackgroundPaint(new Color(255, 228, 196));
plot.getRendererForDataset(plot.getDataset(0)).setSeriesPaint(0, Color.GRAY);
XYSeriesCollection dataset2 = new XYSeriesCollection();
XYSeries warningKoordinates = new XYSeries("Very critical");
for (SimulationResult sr : criticalSR.values()) {
warningKoordinates.add(sr.getMinTTC(), sr.getMinTHW()); //x,y
}
dataset2.addSeries(warningKoordinates);
plot.setDataset(1, dataset2);
plot.getRendererForDataset(plot.getDataset(1)).setSeriesPaint(0, Color.RED);
So I have two different datasets (dataset 1 and dataset 2). Each dataset contains different values. My aim is to change the color of the dataset 1 to gray and the color of the second one to red. (BUT the shape should same the SAME). At the beginning I only had one dataset with 2 XYSeries. The problem at that time was that the shape was different for each XYSeries. Now I have the opposite problem. The shape stays but the color does not change.
This is what my table looks right now:
As you can see right now I cant seperate which one is very critical and whitch not.

It is found that only one dataSet is required, all series should be added to the dataSet. And using the first parameter of setSeriesPaint to configure color of the series. Since the version of jfreeChart is not provide, I used 1.0.12. The code is edited for testing.
public static void main(String[] args) throws IOException {
XYSeriesCollection dataset = new XYSeriesCollection();
int[][] sr = new int[3][2];
for (int i = 0; i < sr.length; i++) {
sr[i][0] = i + 3;
sr[i][1] = 2 * (i + 1) + 1;
}
XYSeries validKoordinates = new XYSeries("Not dangerous");
XYSeries warningKoordinates = new XYSeries("Very critical");
System.out.println(sr.length);
for (int i = 0; i < sr.length; i++) {
validKoordinates.add(sr[i][0], sr[i][1]);
}
for (int i = 0; i < sr.length; i++) {
warningKoordinates.add(sr[i][0]+1, sr[i][1]+1);
}
// Add dataset for all series
dataset.addSeries(validKoordinates);
dataset.addSeries(warningKoordinates);
// Only reference one dataset
JFreeChart chart = ChartFactory.createScatterPlot("Distribution of THW and TTC Values", "TTC", "THW", dataset,
PlotOrientation.HORIZONTAL, true, true, true);
XYPlot plot = (XYPlot) chart.getPlot();
plot.setBackgroundPaint(new Color(255, 228, 196));
// Change the index of setSeriesPaint to set color
plot.getRendererForDataset(dataset).setSeriesPaint(0, Color.GRAY);
plot.getRendererForDataset(dataset).setSeriesPaint(1, Color.RED);
BufferedImage objBufferedImage = chart.createBufferedImage(600, 800);
ByteArrayOutputStream bas = new ByteArrayOutputStream();
try {
ImageIO.write(objBufferedImage, "png", bas);
} catch (IOException e) {
e.printStackTrace();
}
byte[] byteArray = bas.toByteArray();
InputStream in = new ByteArrayInputStream(byteArray);
BufferedImage image = ImageIO.read(in);
File outputfile = new File("testimage.png");
ImageIO.write(image, "png", outputfile);
}
The image generated by the above method

JFreeChart low performance for MeterPlot

I'm implementing a web application using spring 4.2.5 and jasperreports 6.4.3.
This app is supposed to generate a pdf file as output. There are three jrxml files:
firstpage.jrxml: contains logo and some titles
intro.jsrxml: contains some texts and a table of items overview
items.jrxml: contains some texts and an image to show a JFree MeterPlot output buffer image.
The code:
public void export() {
JasperPrint firstPagePrint = ...;
JasperPrint introPrint = ...;
List<JasperPrint> itemsPrints = new LinkedList<JapserPrint>();
List<Item> items = ...;
for (int i = 0; i < items.size(); i++) {
Item item = items.get(i);
MeterPlot meterPlot = new MeterPlot(new DefaultValueDataset(item.getValue()));
meterPlot.setRange(new Range(item.getMinValue(), item.getMaxValue()));
meterPlot.addInterval(new MeterInterval("bad", new Range(item.getMinValue(), item.getSect1()),
Color.red, new BasicStroke(2f), Color.red));
meterPlot.addInterval(new MeterInterval("weak", new Range(item.getSect1(), item.getSect2()),
Color.orange, new BasicStroke(2f), Color.orange));
meterPlot.addInterval(new MeterInterval("average", new Range(item.getSect2(), item.getSect3()),
Color.yellow, new BasicStroke(2f), Color.yellow));
meterPlot.addInterval(new MeterInterval("good", new Range(item.getSect3(), item.getSect4()),
Color.green, new BasicStroke(2f), Color.green));
meterPlot.addInterval(new MeterInterval("excellent", new Range(item.getSect4(), item.getMaxValue()),
Color.black, new BasicStroke(2f), Color.BLUE));
JFreeChart jFreeChart = new JFreeChart(item.getTitle(), meterPlot);
BufferedImage bufferedImage = jFreeChart.createBufferedImage(555, 250);
String tmpFile = FileService.JASPER + Util.randomNumeralString(20) + ".png";
ImageIO.write(bufferedImage, "png", new File(tmpFile));
itemAnalysisParams.put("chartImage", tmpFile);
analysisPrints.add(JasperFillManager.fillReport(ITEM_ANALYSIS, itemAnalysisParams, new JREmptyDataSource()));
}
...export pdf by jasper report prints
}
Notice:
sect1, sect2, sect3 and sect4 are internal limitation for intervals.
sect = (maxValue - minValue) * 20 / 100
sect1 = this.minValue + sect
sect2 = this.sect1 + sect
sect3 = this.sect2 + sect
sect4 = this.sect3 + sect
The problem:
The line BufferedImage bufferedImage = jFreeChart.createBufferedImage(555, 250); takes a long time- about 15min- to create image and it repeats for about 45 items and takes 15min*45 total time to generate report.
In advance, I appreciate any help.

JFreeChart Bar Chart Production

I'm trying to create a bar chart that generates a dataset from within a for loop.
String scores = scoreText.getText();
String[] data = scores.split(",");
DefaultCategoryDataset barChartDataset = null;
for (int l = 0; l < data.length; l++) {
barChartDataset = new DefaultCategoryDataset();
// barChartDataset.setValue(new Double(data[l]), "Scores", stu);
barChartDataset.addValue(new Double(data[l]), "Scores", stu);
System.out.println(data[l]);
}
JFreeChart barChart = ChartFactory.createBarChart3D("Summary", "Name", "Scores", barChartDataset, PlotOrientation.VERTICAL, false, true, false);
The data is 10,5. Now when the data goes through all of this and the graph is generated, only the bar for the value 5 is shown. Where is the separate bar for the value of 10? Does anyone know what I'm doing wrong? Any help is appreciated. Thanks
EDIT:
Here is the code for the bar graph:
String scores = scoreText.getText();
String[] data = scores.split(",");
DefaultCategoryDataset barChartDataset = new DefaultCategoryDataset();
//JFreeChart barChart = null;
for (int l = 0; l < data.length; l++) {
//barChartDataset.addValue(new Double(data[l]), "Scores", stu);
barChartDataset.setValue(new Double(data[l]), "Scores", stu);
System.out.println(new Double(data[l]));
}
JFreeChart barChart = ChartFactory.createBarChart3D("Summary", "Name", "Scores", barChartDataset, PlotOrientation.VERTICAL, false, true, false);
barChart.setBackgroundPaint(Color.YELLOW);
barChart.getTitle().setPaint(Color.RED);
final CategoryPlot categoryPlot = barChart.getCategoryPlot();
BarRenderer barRenderer = (BarRenderer) categoryPlot.getRenderer();
DecimalFormat decimalFormat = new DecimalFormat("#.##");
barRenderer.setItemLabelGenerator(new StandardCategoryItemLabelGenerator("{2}", decimalFormat));
categoryPlot.setRenderer(barRenderer);
barRenderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.HALF_ASCENT_CENTER));
barRenderer.setItemLabelsVisible(true);
barChart.getCategoryPlot().setRenderer(barRenderer);
ValueMarker marker = new ValueMarker(7);
marker.setLabel("Required Level");
marker.setLabelAnchor(RectangleAnchor.BOTTOM_RIGHT);
marker.setLabelTextAnchor(TextAnchor.TOP_RIGHT);
marker.setPaint(Color.BLACK);
categoryPlot.addRangeMarker(marker);
categoryPlot.setRangeGridlinePaint(Color.BLUE);
//The JFrame that the bar chart will be in.
ChartFrame chartFrame = new ChartFrame("Bar Chart for Parameters", barChart);
chartFrame.setVisible(true);
chartFrame.setSize(600, 600);

I guess you are doing a small mistake, that is with in for loop for each iteration of loop you are creating a new DefaultCategoryDataset instance. So each time each item is added to a separate DefaultCategoryDataset object and the final DefaultCategoryDataset instance having the last value is utilized to create the chart, that is the only reason you are getting only last value in your chart.
Solution is create DefaultCategoryDataset object outside and before the for loop only once like:
DefaultCategoryDataset barChartDataset = new DefaultCategoryDataset();
for (int l = 0; l < data.length; l++) {
// barChartDataset.setValue(new Double(data[l]), "Scores", stu);
barChartDataset.addValue(new Double(data[l]), "Scores", stu);
System.out.println(data[l]);
}
JFreeChart barChart = ChartFactory.createBarChart3D("Summary", "Name", "Scores", barChartDataset, PlotOrientation.VERTICAL, false, true, false);
Here is the code snippet I have in one of my application and it is working fine:
DefaultCategoryDataset dataset= new DefaultCategoryDataset();
// Get today as a Calendar....
Calendar today = Calendar.getInstance();
for(int i=0; i<15 ;i++)
{
//get util.Date class object for today date.....
java.util.Date today_date=new java.util.Date(today.getTimeInMillis());
//convert date in string format to display on chart.....
String today_string_date = new SimpleDateFormat("dd/MM/yy").format(today_date);
// set values to DefaultCategoryDataset to display on chart...
dataset.setValue(rs1.getInt("login_count"),"Login Frequency", today_string_date);
today.add(Calendar.DATE, -1);
}// for closing...
JFreeChart chart = ChartFactory.createBarChart3D("ISIS:Overall login history for last 15 days", "Date -->", "No of user(s) login per day -->", dataset, PlotOrientation.VERTICAL, true, true, false);
CategoryPlot p = chart.getCategoryPlot();
NumberAxis rangeAxis = (NumberAxis) p.getRangeAxis();
rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
BarRenderer renderer = (BarRenderer) p.getRenderer();
DecimalFormat decimalformat1 = new DecimalFormat("##");
renderer.setItemLabelGenerator(new StandardCategoryItemLabelGenerator("{2}", decimalformat1));
renderer.setItemLabelsVisible(true);
ChartUtilities.saveChartAsPNG(new File(filePath +"/chart1.png"), chart ,1250, 400);
I hope it will solve your problem.