Regression on Y-axis for CategoryChart since 3.6.6

[ybotquelen]

Since I've migrated to version 3.6.6 from 3.6.5, I encounter the following regression on the category charts:

• The Y-axis display wrong values compared to the values of my bar series
  see attached sample:
  

Thank you in advance for your correction and thank you for your great library !

[timmolter]

Thank you for the bug report. Would it be possible to paste a short code snippet demonstrating the chart in code please?

[ybotquelen]

Hello,
Please find below a sample class demonstrating the issue:

`import java.awt.Color;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

import org.apache.commons.lang3.tuple.Pair;

import org.knowm.xchart.CategoryChart;
import org.knowm.xchart.CategoryChartBuilder;
import org.knowm.xchart.CategorySeries;
import org.knowm.xchart.SwingWrapper;
import org.knowm.xchart.style.CategoryStyler;
import org.knowm.xchart.style.Styler.LegendPosition;

public class SampleRegression {

public static final SimpleDateFormat sdfMonthYear = new SimpleDateFormat("MM/yyyy");

public static void main(String[] args) {
	try {
		new SwingWrapper<CategoryChart>(getVolumesChart()).displayChart();
	}
	catch (Exception e) {
		e.printStackTrace();
	}

}

public static CategoryChart getVolumesChart() throws Exception {
	Pair<List<Date>, List<Double>> data;
	CategorySeries serie;
	List<Date> xSerie = null;

	// Création du graphe
	CategoryChart chart = new CategoryChartBuilder().width(800)
			.height(500).title("Volumes").xAxisTitle("Période").yAxisTitle("Volumes").build();

	// Définition du style du graphe
	CategoryStyler styler = chart.getStyler();
	styler.setLegendPosition(LegendPosition.InsideNW);
	styler.setLegendBackgroundColor(Color.DARK_GRAY);
	styler.setDatePattern("MM/yyyy");
	styler.setXAxisTickMarkSpacingHint(50);
	styler.setAntiAlias(true);
	styler.setChartTitleBoxBorderColor(Color.LIGHT_GRAY);
	styler.setToolTipsEnabled(true);
	styler.setOverlapped(false);
	styler.setStacked(true);
	styler.setChartBackgroundColor(Color.DARK_GRAY);
	styler.setChartFontColor(Color.LIGHT_GRAY);
	styler.setAxisTickLabelsColor(Color.LIGHT_GRAY);
	styler.setYAxisMax(Double.valueOf(100));

	for (int i = 0; i < 3; i++) {
		data = getSampleData(i);
		if (xSerie == null) {
			xSerie = data.getLeft();
		} 
		serie = chart.addSeries("Serie " + i, xSerie, data.getRight());
		serie.setChartCategorySeriesRenderStyle(CategorySeries.CategorySeriesRenderStyle.Bar);
	}
	return chart;
}

public static Pair<List<java.util.Date>, List<Double>> getSampleData(int i) throws Exception {
	List<java.util.Date> xData = new CopyOnWriteArrayList<java.util.Date>();
	List<Double> yData = new CopyOnWriteArrayList<Double>();
	
	xData.add(sdfMonthYear.parse("09/2020"));
	yData.add(Double.valueOf(20 + i));
	xData.add(sdfMonthYear.parse("10/2020"));
	yData.add(Double.valueOf(10 + i));
	xData.add(sdfMonthYear.parse("11/2020"));
	yData.add(Double.valueOf(30 + i));
	return Pair.of(xData, yData);
}

}
`

[timmolter]

Thank you. Seems fixed now, on the latest SNAPSHOT version.