Cartesian Chart

• Dec 28, 2018
• 5 minutes to read

The DevExpress Chart allows you to visualize your data in a Cartesian chart. The image below shows a Cartesian chart and highlights its major elements:

This guide describes specific operations the Chart can perform.

How to: Modify chart series

The Chart visualizes data the series provides. Each series defines data appearance and behavior. Series, compatible with the Chart View, inherits the Series class.

Note that chart should be populated with data. Refer to the Series guide for more information.

The following code snippet shows how to add a series to a chart:

Java

LineSeries lineSeries = new LineSeries();
lineSeries.setDisplayName("US");
lineSeries.setData(new GdpData(points));

mChart.addSeries(lineSeries);
//...
class GdpData implements NumericSeriesData {
    List<Gdp> gdps = new ArrayList<>();

    public  GdpData(Gdp... points) {
        for (Gdp point : points) gdps.add(point);
    }
    @Override
    public int getDataCount() {
        return gdps.size();
    }
    @Override
    public double getArgument(int i) {
        return gdps.get(i).getYear();
    }
    @Override
    public double getValue(int i) {
        return gdps.get(i).getProduct();
    }
}

C#

LineSeries lineSeries = new LineSeries();
lineSeries.DisplayName = "US";
lineSeries.Data = new GdpData(points);

chart.AddSeries(lineSeries);
//...
public class GdpData : Java.Lang.Object, INumericSeriesData {
    List<Gdp> gdps;
    public int DataCount {
        get {
            return gdps.Count;
        }
    }
    public SimpleDateTimeDataAdapter(List<Gdp> gdps) {
        this.gdps = gdps;
    }
    public double GetArgument(int i) {
        return gdps[i].Year;
    } 
    public double GetValue(int i) {
        return gdps[i].Product;
    }
}

The following table contains methods allowing you to obtain, add or remove series of the chart:

Method	Description
Chart.getSeries()	Returns the array of series that the chart displays.
Chart.addSeries(Series)	Adds the specified new series to the chart.
Chart.removeSeries(Series)	Removes the specified series from the chart.

How to: Manage chart axes

In addition to series, chart contains elements allowing you to configure how it looks and behaves. Axes are responsible for the coordinate space the chart visualize.

The following example demonstrates how to customize chart axes:

Java

QualitativeAxisX xAxis = new QualitativeAxisX();
xAxis.setRange(new QualitativeRange("A", "Z"));
mChart.setAxisX(xAxis);

NumericAxisY yAxis = new NumericAxisY();
yAxis.setGridAlignment(1.0);
yAxis.setAlwaysShowZeroLevel(false);
mChart.setAxisY(yAxis);

C#

QualitativeAxisX xAxis = new QualitativeAxisX{
    Range = new QualitativeRange("A", "Z") 
};
chart.AxisX = xAxis;
NumericAxisY yAxis = new NumericAxis{
    GridAlignment = new Java.Lang.Double(1.0),
    AlwaysShowZeroLevel = false
};
chart.AxisY = yAxis;

The table below contains the main symbols for configuring chart axes:

Symbol	Description
Chart.getAxisX()	Returns the chart’s X-axis.
Chart.setAxisX(AxisX)	Specifies the chart’s X-axis.
Chart.getAxisY()	Returns the chart’s Y-axis.
Chart.setAxisY(NumericAxisY)	Specifies the chart’s Y-axis.
QualitativeAxisX	The arguments axis that manages representation of series with QualitativeSeriesData data.
NumericAxisX	The arguments axis that manages representation of series with NumericSeriesData data.
DateTimeAxisX	The arguments axis that manages representation of series with DateTimeSeriesData or FinancialSeriesData data.
NumericAxisY	The values axis that manages representation of series with NumericData data.

Refer to the Axes guide for more information about axes configuration.

How to: Synchronize multiple charts

You can scroll and zoom several charts simultaneously by synchronizing their axes ranges. These axes should have the same scale type and the ChartSynchronizer object assigned.

Java

ChartSynchronizer synchronizer = new ChartSynchronizer();

DateTimeAxisX chart1AxisX = new DateTimeAxisX();
chart1AxisX.setSynchronizer(synchronizer);
chart1.setAxisX(chart1AxisX);

DateTimeAxisX chart2AxisX = new DateTimeAxisX();
chart2AxisX.setSynchronizer(synchronizer);
chart2.setAxisX(chart2AxisX);

C#

ChartSynchronizer axisSynchronizer = new ChartSynchronizer();
chart1.AxisX = new DateTimeAxisX {
    Synchronizer = axisSynchronizer,
};
chart2.AxisX = new DateTimeAxisX {
    Synchronizer = axisSynchronizer,
};

The code uses the following symbols:

Symbol	Description
ChartSynchronizer	A synchronization marker.
AxisBase.setSynchronizer(ChartSynchronizer)	Specifies a ChartSynchronizer object that indicates if the axis range should be synchronized.

How to: Configure the chart legend

The Legend identifies series in a chart. The following example demonstrates the basic legend configuration:

Java

Legend legend = new Legend();
legend.setOrientation(LegendOrientation.HORIZONTAL);
legend.setHorizontalPosition(LegendHorizontalPosition.CENTER);
legend.setVerticalPosition(LegendVerticalPosition.TOP_OUTSIDE);
legend.setVisible(true);
mChart.setLegend(legend);

C#

Legend legend = new Legend() {
    Orientation = LegendOrientation.Horizontal,
    HorizontalPosition = LegendHorizontalPosition.Center,
    VerticalPosition = LegendVerticalPosition.TopOutside,
    Visible = true
};
chart.Legend = legend;

The table below contains the main methods for configuring legend:

Method	Description
ChartBase.getLegend()	[!summary-include(com.devexpress.dxcharts.ChartBase.getLegend)
ChartBase.setLegend(Legend)	Specifies the chart legend‘s options.
Legend	The legend of the chart.

Refer to the Legend guide for more information about legend configuration.

How to: Scroll and zoom

In addition to common interactivity capabilities, the Cartesian Chart allows end-users to navigate on the chart coordinate space:

The following code example demonstrates how to enable zooming and scrolling along the X axis and disable navigation along the Y axis, like on the image above.

Java

mChart.setAxisXNavigationMode(AxisNavigationMode.SCROLLING_AND_ZOOMING);
mChart.setAxisYNavigationMode(AxisNavigationMode.NONE);

C#

chart.AxisXNavigationMode = AxisNavigationMode.ScrollingAndZooming;
chart.AxisYNavigationMode = AxisNavigationMode.None;

The code above uses the following methods:

Method	Description
Chart.getAxisXNavigationMode()	Returns the X-axis’s navigation mode.
Chart.setAxisXNavigationMode(AxisNavigationMode)	Specifies the X-axis’s navigation mode.
Chart.getAxisYNavigationMode()	Returns the Y-axis’s navigation mode.
Chart.setAxisYNavigationMode(AxisNavigationMode)	Specifies the Y-axis’s navigation mode.
AxisNavigationMode	Lists values specifying possible axis navigation modes.

How to: Change chart appearance

Appearance of all chart elements including the Chart can be changed using styles. The following image demonstrates which chart parameters can be styled:

The following code snippet demonstrates how to obtain the image above:

Java

ChartStyle chartStyle = new ChartStyle();
chartStyle.setBorderColor(Color.DKGRAY);
chartStyle.setBorderThickness(2.0f);
chartStyle.setBackgroundColor(Color.LTGRAY);
chartStyle.setPalette(new int[] {0xff60a69f, 0xff78b6d9, 0xff6682bb});
mChart.setStyle(chartStyle);

C#

ChartStyle chartStyle = new ChartStyle {
    BorderColor = new Integer(Color.DarkGray),
    BorderThickness = new Float(1.0),
    BackgroundColor = new Integer(Color.LightGray)
};
chartStyle.SetPalette(new int[] {
    Color.Argb(255, 96, 166, 159).ToArgb(),
    Color.Argb(255, 120, 182, 217).ToArgb(),
    Color.Argb(255, 102, 130, 187).ToArgb()
});
chart.Style = chartStyle;                

The following symbols allow you to configure chart style:

Symbol	Description
Chart.getStyle() |Returns the chart’s style.
Chart.setStyle(ChartStyle) |Specifies the chart’s style.
ChartStyle |The chart appearance settings’ storage.

Note

Each chart element contain a style that configures the element appearance. For example, the Legend class provides the getStyle()/setStyle(LegendStyle) methods that manages the legend style.