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DiagramCoordinates.QualitativeArgument Property

Gets the qualitative argument of the diagram point.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v24.1.dll

NuGet Package: DevExpress.Charts

Declaration

public string QualitativeArgument { get; }

Property Value

Type Description
String

A String, representing a diagram point’s qualitative argument.

Remarks

Use the XYDiagram2D.PointToDiagram method to convert the display coordinates of the point within the diagram to the DiagramCoordinates object. This object provides extensive information about the point in question. The QualitativeArgument property of this object is calculated as follows:

If the DiagramCoordinates.ArgumentScaleType is not the ScaleType.Qualitative, this method returns the Empty value.

Example

The following example illustrates use of XYDiagram2D.PointToDiagram method for dragging the constant line with the mouse, and changing the series point values accordingly.

using System;
using System.Windows.Forms;
using DevExpress.XtraCharts;

namespace InteractiveConstantLine {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }

        Cursor defCursor;
        bool dragging = false;
        ChartControl chart;
        XYDiagram diagram;
        ConstantLine line;

        private void Form1_Load(object sender, EventArgs e) {
            this.chart = this.chartControl1;
            this.diagram = this.chart.Diagram as XYDiagram;
            this.line = this.diagram.AxisX.ConstantLines.GetConstantLineByName("ConstantLine1");

            // Add a title to the chart.
            ChartTitle chartTitle1 = new ChartTitle();
            chartTitle1.Text = "Drag the constant line...";
            this.chart.Titles.Add(chartTitle1);

        }

        private void chartControl1_MouseDown(object sender, MouseEventArgs e) {
            if (diagram == null)
                return;

            // Get the information about the clicked point.
            DiagramCoordinates coords = diagram.PointToDiagram(e.Location);

            // If the point is within the diagram and in the constant line ...
            if (!coords.IsEmpty && line.AxisValue is DateTime &&
                coords.DateTimeArgument.Equals((DateTime)line.AxisValue)) {

                // Allow dragging, catch the mouse and change the cursor.
                dragging = true;
                chart.Capture = true;
                SetCursor();
            }
        }

        private void chartControl1_MouseUp(object sender, MouseEventArgs e) {
            dragging = false;
            chart.Capture = false;
        }

        private void chartControl1_MouseMove(object sender, MouseEventArgs e) {
            if (diagram == null)
                return;

            if (dragging && (e.Button & MouseButtons.Left) == 0) {
                dragging = false;
                chart.Capture = false;
            }

            DiagramCoordinates coords = diagram.PointToDiagram(e.Location);
            if (coords.IsEmpty)
                RestoreCursor();
            else {
                if (dragging)
                    line.AxisValue = coords.DateTimeArgument;

                if (line.AxisValue is DateTime && coords.DateTimeArgument.Equals((DateTime)line.AxisValue))
                    SetCursor();
                else
                    RestoreCursor();
            }
        }
        void SetCursor() {
            if (defCursor == null)
                defCursor = Cursor.Current;
            Cursor.Current = Cursors.VSplit;
        }

        void RestoreCursor() {
            if (defCursor != null) {
                Cursor.Current = defCursor;
                defCursor = null;
            }
        }

    }
}

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the QualitativeArgument property.

Note

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See Also