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Jigisha
80
Changing extent of axis using mouse interaction
posted

hi,

I want to change the extent of the axis by using the mouse dragging  as you do in dragging data point.

Parents
  • 17605
    posted

    You can try the following code: 

    public class MovingAxisTool : InteractionTool

    {

    private const int size = 2;

    private Point prevPoint;

    /// <summary>

    /// Initializes a new instance of the <see cref="MovingAxisTool"/> class.

    /// </summary>

    /// <param name="ultraChart">The ultra chart.</param>

    public MovingAxisTool(UltraChart ultraChart): base(ultraChart)

    {

    }

    /// <summary>

    /// Determines whether this tool can start.

    /// </summary>

    /// <returns>

    /// <c>true</c> if this tool can start; otherwise, <c>false</c>.

    /// </returns>

    public override bool CanStart()

    {

    ChartLayer chartLayer = this.ChartCore.GetChartLayer();

    IAdvanceAxis axisY = chartLayer.Grid["Y"] as IAdvanceAxis;

    this.prevPoint = this.LastInput.ViewPoint;

    double yValue = (double)axisY.MapInverse(this.prevPoint.Y);

    if (Math.Abs(yValue - (double)axisY.Minimum) < size)

    {

    return true;

    }

    return false;

    }

    public override void Start()

    {

    base.Start();System.Windows.Forms.Cursor.Current = Cursors.SizeNS;

    }

     

    /// <summary>

    /// Called when this tool is started and the mouse is moved.

    /// </summary>

    public override void MouseMove()

    {

    base.MouseMove();

     

    int dy = this.LastInput.ViewPoint.Y - prevPoint.Y;

    int newExtend = this.UltraChart.Axis.X.Extent - dy;

    if (newExtend < 0)

    {

    newExtend = 0;

    }

    if (newExtend > 500)

    {

    newExtend = 500;

    }

    this.UltraChart.Axis.X.Extent = newExtend;

    this.prevPoint = this.LastInput.ViewPoint;

    this.InvalidateView(CacheLevel.ImageLevelCache);

    }

     

    /// <summary>

    /// Called when this tool stops.

    /// </summary>

    public override void Stop()

    {

    System.Windows.Forms.    Cursor.Current = Cursors.Default;base.Stop();

    }

    } 

    ...

    private void Form1_Load(object sender, EventArgs e)

    {

    this.ultraChart1.DataSource = DemoTable.Table();

    this.ultraChart1.DataBind();

    MovingAxisTool movingAxisTool = new MovingAxisTool(this.ultraChart1);

    this.ultraChart1.AddMouseDownTool(movingAxisTool);

    }

     

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