Knob Constructor

To create one new request of the Knob control is necessary to use New constructor while, the used resources come rileased with the method Dispose.

Example:

In the following example they come used two buttons of which the first one, btnCreateKnob, to the activation of the Click event creates a Knob control, set up some property and it visualizes it on the form, while according to button, btnDisposeKnob, to the activation of the Click event free the resources engaged from the control.

[Visual Basic]

Dim knb As LabDevTools.Knob

Private Sub btnCreateKnob_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCreateKnob.Click

knb = New LabDevTools.Knob

knb.Name = "knbMyKnob"

knb.Appearance.Radius = 37

knb.Top = btnCreateKnob.Top - 165

knb.Left = btnCreateKnob.Left + 10

knb.ForeColor = Color.Red

knb.Appearance.ArcStart = 270

knb.Appearance.ArcEnd = 270

knb.Appearance.CursorProperties.CursorColor = Color.Red

knb.Appearance.Divisions.MayorColor = Color.Violet

knb.Appearance.BorderProperties.BorderWidth = 11

knb.Appearance.BackgroundScale.BackgroundScale = True

knb.Appearance.BackgroundScale.BackgroundScaleWidth = 15

knb.Appearance.Divisions.NumberOfDivisions = 20

knb.Appearance.Style = LabDevTools.Appearance.StyleKnob.StyleDial

knb.Values.Max = 1000

knb.Values.Min_Visible = False

knb.Values.Min = -1000

Controls.Add(knb)

btnDisposeKnob.Enabled = True

End Sub

Private Sub btnDisposeKnob_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDisposeKnob.Click

If Not IsNothing(knb) Then knb.Dispose()

btnDisposeKnob.Enabled = False

End Sub

[C#]

LabDevTools.Knob knb;

private void btnCreateKnob_Click(object sender, System.EventArgs e)

{

knb = new LabDevTools.Knob();

knb.Name = "knbMyKnob";

knb.Appearance.Radius = 37;

knb.Top = btnCreateKnob.Top - 165;

knb.Left = btnCreateKnob.Left + 10;

knb.ForeColor = Color.Red;

knb.Appearance.ArcStart=270;

knb.Appearance.ArcEnd=270;

knb.Appearance.CursorProperties.CursorColor = Color.Red;

knb.Appearance.Divisions.MayorColor = Color.Violet;

knb.Appearance.BorderProperties.BorderWidth = 11;

knb.Appearance.BackgroundScale.BackgroundScale = true;

knb.Appearance.BackgroundScale.BackgroundScaleWidth = 15;

knb.Appearance.Divisions.NumberOfDivisions = 20;

knb.Appearance.Style = LabDevTools.Appearance.StyleKnob.StyleDial;

knb.Values.Max = 1000;

knb.Values.Min = -1000;

knb.Values.Min_Visible=false;

Controls.Add(knb);

btnDisposeKnob.Enabled = true;

}

private void btnDisposeKnob_Click(object sender, System.EventArgs e)

{

if(knb!=null){knb.Dispose();}

btnDisposeKnob.Enabled = false;

}