Chart Axis
Getting the Max Values on the Vertical Axis on Charts
Aspose.Slides for Java allows you to obtain the minimum and maximum values on a vertical axis. Go through these steps:
- Create an instance of the Presentation class.
- Access the first slide.
- Add a chart with default data.
- Get the actual maximum value on the axis.
- Get the actual minimum value on the axis.
- Get the actual major unit of the axis.
- Get the actual minor unit of the axis.
- Get the actual major unit scale of the axis.
- Get the actual minor unit scale of the axis.
This sample code—an implementation of the steps above—shows you how to get the required values in Java:
Presentation pres = new Presentation();
try {
Chart chart = (Chart)pres.getSlides().get_Item(0).getShapes().addChart(ChartType.Area, 100, 100, 500, 350);
chart.validateChartLayout();
double maxValue = chart.getAxes().getVerticalAxis().getActualMaxValue();
double minValue = chart.getAxes().getVerticalAxis().getActualMinValue();
double majorUnit = chart.getAxes().getHorizontalAxis().getActualMajorUnit();
double minorUnit = chart.getAxes().getHorizontalAxis().getActualMinorUnit();
// Saves the presentation
pres.save("MaxValuesVerticalAxis_out.pptx", SaveFormat.Pptx);
} finally {
if (pres != null) pres.dispose();
}
Swapping the Data between Axes
Aspose.Slides allows you to quickly swap the data between axes—the data represented on the vertical axis (y-axis) moves to the horizontal axis (x-axis) and vice versa.
This Java code shows you how to perform the data swap task between axes on a chart:
Presentation pres = new Presentation();
try {
IChart chart = pres.getSlides().get_Item(0).getShapes().addChart(ChartType.ClusteredColumn, 100, 100, 400, 300);
//Switches rows and columns
chart.getChartData().switchRowColumn();
// Saves presentation
pres.save("SwitchChartRowColumns_out.pptx", SaveFormat.Pptx);
} finally {
if (pres != null) pres.dispose();
}
Disabling the Vertical Axis for Line Charts
This Java code shows you how to hide the vertical axis for a line chart:
Presentation pres = new Presentation();
try {
IChart chart = pres.getSlides().get_Item(0).getShapes().addChart(ChartType.Line, 100, 100, 400, 300);
chart.getAxes().getVerticalAxis().setVisible(false);
pres.save("chart.pptx", SaveFormat.Pptx);
} finally {
if (pres != null) pres.dispose();
}
Disabling the Horizontal Axis for Line Charts
This code shows you how to hide the horizontal axis for a line chart:
Presentation pres = new Presentation();
try {
IChart chart = pres.getSlides().get_Item(0).getShapes().addChart(ChartType.Line, 100, 100, 400, 300);
chart.getAxes().getHorizontalAxis().setVisible(false);
pres.save("chart.pptx", SaveFormat.Pptx);
} finally {
if (pres != null) pres.dispose();
}
Changing Category Axis
Using the CategoryAxisType property, you can specify your preferred category axis type (date or text). This code in Java demonstrates the operation:
Presentation presentation = new Presentation("ExistingChart.pptx");
try {
IChart chart = (IChart)presentation.getSlides().get_Item(0).getShapes().get_Item(0);
chart.getAxes().getHorizontalAxis().setCategoryAxisType(CategoryAxisType.Date);
chart.getAxes().getHorizontalAxis().setAutomaticMajorUnit(false);
chart.getAxes().getHorizontalAxis().setMajorUnit(1);
chart.getAxes().getHorizontalAxis().setMajorUnitScale(TimeUnitType.Months);
presentation.save("ChangeChartCategoryAxis_out.pptx", SaveFormat.Pptx);
} finally {
if (presentation != null) presentation.dispose();
}
Setting the Date Format for Category Axis Value
Aspose.Slides for Java allows you to set the date format for a category axis value. The operation is demonstrated in this Java code:
Presentation pres = new Presentation();
try {
IChart chart = pres.getSlides().get_Item(0).getShapes().addChart(ChartType.Area, 50, 50, 450, 300);
IChartDataWorkbook wb = chart.getChartData().getChartDataWorkbook();
wb.clear(0);
chart.getChartData().getCategories().clear();
chart.getChartData().getSeries().clear();
chart.getChartData().getCategories().add(wb.getCell(0, "A2", convertToOADate(new GregorianCalendar(2015, 1, 1))));
chart.getChartData().getCategories().add(wb.getCell(0, "A3", convertToOADate(new GregorianCalendar(2016, 1, 1))));
chart.getChartData().getCategories().add(wb.getCell(0, "A4", convertToOADate(new GregorianCalendar(2017, 1, 1))));
chart.getChartData().getCategories().add(wb.getCell(0, "A5", convertToOADate(new GregorianCalendar(2018, 1, 1))));
IChartSeries series = chart.getChartData().getSeries().add(ChartType.Line);
series.getDataPoints().addDataPointForLineSeries(wb.getCell(0, "B2", 1));
series.getDataPoints().addDataPointForLineSeries(wb.getCell(0, "B3", 2));
series.getDataPoints().addDataPointForLineSeries(wb.getCell(0, "B4", 3));
series.getDataPoints().addDataPointForLineSeries(wb.getCell(0, "B5", 4));
chart.getAxes().getHorizontalAxis().setCategoryAxisType(CategoryAxisType.Date);
chart.getAxes().getHorizontalAxis().setNumberFormatLinkedToSource(false);
chart.getAxes().getHorizontalAxis().setNumberFormat("yyyy");
pres.save("output.pptx", SaveFormat.Pptx);
} finally {
if (pres != null) pres.dispose();
}
public static String convertToOADate(GregorianCalendar date) throws ParseException
{
double oaDate;
SimpleDateFormat myFormat = new SimpleDateFormat("dd MM yyyy");
java.util.Date baseDate = myFormat.parse("30 12 1899");
Long days = TimeUnit.DAYS.convert(date.getTimeInMillis() - baseDate.getTime(), TimeUnit.MILLISECONDS);
oaDate = (double) days + ((double) date.get(Calendar.HOUR_OF_DAY) / 24) + ((double) date.get(Calendar.MINUTE) / (60 * 24)) + ((double) date.get(Calendar.SECOND) / (60 * 24 * 60));
return String.valueOf(oaDate);
}
Setting the Rotation Angle for Chart Axis Title
Aspose.Slides for Java allows you to set the rotation angle for a chart axis title. This Java code demonstrates the operation:
Presentation pres = new Presentation();
try {
IChart chart = pres.getSlides().get_Item(0).getShapes().addChart(ChartType.ClusteredColumn, 50, 50, 450, 300);
chart.getAxes().getVerticalAxis().setTitle(true);
chart.getAxes().getVerticalAxis().getTitle().getTextFormat().getTextBlockFormat().setRotationAngle(90);
pres.save("output.pptx", SaveFormat.Pptx);
} finally {
if (pres != null) pres.dispose();
}
Setting the Position Axis in a Category or Value Axis
Aspose.Slides for Java allows you to set the position axis in a category or value axis. This Java code shows how to perform the task:
Presentation pres = new Presentation();
try {
IChart chart = pres.getSlides().get_Item(0).getShapes().addChart(ChartType.ClusteredColumn, 50, 50, 450, 300);
chart.getAxes().getHorizontalAxis().setAxisBetweenCategories(true);
pres.save("output.pptx", SaveFormat.Pptx);
} finally {
if (pres != null) pres.dispose();
}
Enabling the Display Unit label on Chart Value Axis
Aspose.Slides for Java allows you to configure a chart to show a unit label on its chart value axis. This Java code demonstrates the operation:
Presentation pres = new Presentation();
try {
IChart chart = pres.getSlides().get_Item(0).getShapes().addChart(ChartType.ClusteredColumn, 50, 50, 450, 300);
chart.getAxes().getVerticalAxis().setDisplayUnit(DisplayUnitType.Millions);
pres.save("output.pptx", SaveFormat.Pptx);
} finally {
if (pres != null) pres.dispose();
}