Detect Axis Click | Infragistics Forums

455

Detect Axis Click

Talal Nehme posted over 16 years ago

Hello,

Is there a way to detect when the user clicks on an Axis?

I am trying to modify the code from

http://news.infragistics.com/forums/p/10441/46970.aspx#46970 because I have multiple Y axis in multiple layers in a composite chart, and I want the user to be able to move only 1 Y axis at a time.

Is there a way to return the location of the Axis or a hittest that will return a boolean if the current click was over the axis?

Thanks in advance

Talal

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455

Offline Talal Nehme posted over 16 years ago

I wrote the following code to drag the "Nearest" Y axis, but I still haven't found a way to detect an actual click or hover ON or above the axis itself (I would like to be able to change mouse cursor when hovering over an axis before moving it, for example)

---------------------------------------------------------
Public Class DraggingYAxisTool
Inherits InteractionTool
Private prevPoint As Point
Private axisItem As AxisItem

''' <summary>

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

''' </summary>

''' <param name="ultraChart">The ultra chart.</param>
Public Sub New(ByVal ultraChart As UltraChart)
MyBase.New(ultraChart)

End Sub

''' <summary>

''' Determines whether this tool can start.

''' </summary>

''' <returns>

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

''' </returns>

Public Overloads Overrides Function CanStart() As Boolean

Dim MouseDelta As Integer
Dim NearestAxis As AxisItem
MouseDelta = 500000 'very large number bigger than possible chart size to get started with

NearestAxis = Nothing
For Each area As ChartArea In Me.UltraChart.CompositeChart.ChartAreas
Dim curMouseDelta As Integer
For Each item As AxisItem In area.Axes
If (item.axisNumber = AxisNumber.Y_Axis) Then

curMouseDelta = Math.Abs(Me.LastInput.ViewPoint.X - item.Extent)

If curMouseDelta < MouseDelta Then

NearestAxis = item

MouseDelta = curMouseDelta

End If

ElseIf (item.axisNumber = AxisNumber.Y2_Axis) Then

'Axis on far right so we need to add chart width to margin

curMouseDelta = Math.Abs(Me.LastInput.ViewPoint.X - (Me.UltraChart.Width - item.Extent))

If curMouseDelta < MouseDelta Then

NearestAxis = item

MouseDelta = curMouseDelta

End If

End If

Next

Next

If Not (NearestAxis Is Nothing) Then
Me.axisItem = NearestAxis
Return True

Else

Return False

End If

Return False

End Function
Public Overloads Overrides Sub Start()
MyBase.Start()
Me.prevPoint = Me.LastInput.ViewPoint
System.Windows.Forms.Cursor.Current = Cursors.SizeWE

End Sub

''' <summary>

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

''' </summary>
Public Overloads Overrides Sub MouseMove()
MyBase.MouseMove()

Dim newExtend As Integer
Dim dx As Integer = Me.LastInput.ViewPoint.X - prevPoint.X
If Me.axisItem.OrientationType = AxisNumber.Y2_Axis Then
newExtend = Me.axisItem.Extent - dx
ElseIf Me.axisItem.OrientationType = AxisNumber.Y_Axis Then
newExtend = Me.axisItem.Extent + dx
End If

If newExtend < 0 Then

newExtend = 0

End If

If newExtend > 500 Then

newExtend = 500

End If

'left side axis requires the negative value or mouse direction will be contrary to axis movement
Me.axisItem.Extent = newExtend
Me.prevPoint = Me.LastInput.ViewPoint
Me.InvalidateView(CacheLevel.ImageLevelCache)
End Sub

''' <summary>

''' Called when this tool stops.

''' </summary>
Public Overloads Overrides Sub [Stop]()
System.Windows.Forms.Cursor.Current = Cursors.[Default]
MyBase.[Stop]()
End Sub

End Class
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17605

Teodor Taushanov posted over 16 years ago in reply to Talal Nehme

I added functionality for detecting click on the axis:

public class MovingAxisTool : InteractionTool

{
private const int range = 20;
private Point prevPoint;
private AxisItem axisItem;
/// <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()
{
Point viewPoint = this.LastInput.ViewPoint;foreach (ChartArea area in this.UltraChart.CompositeChart.ChartAreas)
{
Rectangle areaBounds = area.InnerBounds;
areaBounds.Height += range / 2;
if (areaBounds.Contains(viewPoint))
{
foreach (AxisItem item in area.Axes)
{
if (item.axisNumber == AxisNumber.X_Axis)
{

this.axisItem = item;
break;
}

}
break;
}

}
foreach (ChartLayerAppearance layerApp in this.UltraChart.CompositeChart.ChartLayers)
{
ChartLayer chartLayer = layerApp.ChartLayer;Rectangle chartBounds = chartLayer.OuterBound;
chartBounds.Height += range / 2;
if (chartBounds.Contains(this.LastInput.ViewPoint))
{

IAdvanceAxis axis = chartLayer.Grid["Y"] as IAdvanceAxis;
if (axis == null)
{
continue;
}
double diff = Math.Abs(axis.MapMinimum - viewPoint.Y);if (diff <= range)
{
return true;
}

}

}
return false;
}

/// <summary>

/// Called when this tool starts.

/// </summary>
public override void Start()
{
base.Start();
this.prevPoint = this.LastInput.ViewPoint;
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.axisItem.Extent - dy;if (newExtend < 0)
{

newExtend = 0;

}
if (newExtend > 500)
{

newExtend = 500;

}
this.axisItem.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();
}

}
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