Forums Ultimate UI for Windows Forms
Your Privacy Matters: We use our own and third-party cookies to improve your experience on our website. By continuing to use the website we understand that you accept their use. Cookie Policy
Close
TheAquaholic TheAquaholic
540
Zooming an Panning a Gantt-chart using the mouse
posted

 Hi,

sorry to be almost "spamming" but we need some answers pretty soon ... Is there a way to zoom using the mouse and when in zoom (so not scale 1) implement the right-click in a manner that panning becomes possible ?

If so, could you give some tips (or working code :-) ) to get this done ?

 

Thanks,

 

Wim

Parents
  • 17605
    posted

    You can try using:

    public class PanningTool : InteractionTool

    {

    private Point prevPoint;

    private AxisAppearance axisApp;

    private Axis axis;

    /// <summary>

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

    /// </summary>

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

    public PanningTool(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()

    {

    if (this.LastInput.MouseEventArgs.Button == MouseButtons.Right)

    {

    return true;

    }

    return false;

    }

    /// <summary>

    /// Called when this tool starts.

    /// </summary>

    public override void Start()

    {

    GridLayer gridLayer = this.ChartCore.GetGridLayer() as GridLayer;

    this.axis = gridLayer.Grid["X"] as Axis;

    this.axisApp = (AxisAppearance)this.axis.GetAppearance();

    this.prevPoint = this.LastInput.ViewPoint;

    System.Windows.Forms.Cursor.Current = Cursors.Hand;

    }

    /// <summary>

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

    /// </summary>

    public override void MouseMove()

    {

    base.MouseMove();

    int dx = this.LastInput.ViewPoint.X - prevPoint.X;

    double correction = -64;

    double coef = (axis.MapRange + correction) * (1 - axis.Scale);

    double scrollOffset = dx / coef;

    if (double.IsNaN(scrollOffset))

    return;

    double d = axisApp.ScrollScale.Scroll + scrollOffset;

    if (d < 0)

    {

    d = 0;

    }

    if (d > 1)

    {

    d = 1;

    }

    axisApp.ScrollScale.Scroll = d;

    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();

    }

    }

     ...

    PanningTool panningTool = new PanningTool(this.ultraChart1);

    this.ultraChart1.AddMouseDownTool(panningTool);

     

    You can also try looking at the WinForms ChartSamples - Chart Interaction.

     

Reply Children