Active X Control

[khanjan_a2k]

Hey everyone,
I am creating this Active X Control... but I want it to be a circle. I am trying to use the code that I use to make a form circular, but it doesn't work in the Actice X Control... Any Idea about how I can do it??...
Also, I have this piece of code, that should only work on the outer ring of the control... I want the centre circle to be inactive... Think of it as a Ipod Click wheel... When the user moves the mouse over the outside circle, the code is executed, whereas when the user moves the mouse over the inner circle, the code doesn't work. So I was wondering, If I can somehow check if the mouse is in a the "area" of a circle. Any guesses??

If you require me to add any additional information, please let me know...
I would really appreciate your help.

Khanjan

[gavio]

You mean this?

[Merri]

Create a new project, add usercontrol in there and try this out:

Option Explicit

Private Declare Function Arc Lib "gdi32" (ByVal hdc As Long, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long, ByVal X3 As Long, ByVal Y3 As Long, ByVal X4 As Long, ByVal Y4 As Long) As Long
Private Declare Function Ellipse Lib "gdi32" (ByVal hdc As Long, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long

Public Sub DrawArc(ByVal hdc As Long, ByVal x As Integer, ByVal y As Integer, ByVal StartAngle As Integer, ByVal EndAngle As Integer, ByVal radius As Integer)
    Dim xs As Integer, ys As Integer, xe As Integer, ye As Integer
    Dim sat As Integer
    
    sat = (StartAngle - 90) Mod 360
    If (StartAngle >= 360) And (sat = 0) Then sat = 360
    xs = Int(x - (radius * Sin((sat / 180) * 3.14159267)))
    ys = Int(y - (radius * Cos((sat / 180) * 3.14159267)))

    sat = (EndAngle - 90) Mod 360
    If (EndAngle >= 360) And (sat = 0) Then sat = 360
    xe = Int(x - (radius * Sin((sat / 180) * 3.14159267)))
    ye = Int(y - (radius * Cos((sat / 180) * 3.14159267)))

    If Abs(EndAngle - StartAngle) < 360 Then _
        Arc hdc, x - radius, y - radius, x + radius, y + radius, xs, ys, xe, ye _
    Else _
        Ellipse hdc, x - radius, y - radius, x + radius, y + radius
End Sub

Private Sub UserControl_Initialize()
    UserControl.ScaleMode = vbPixels
End Sub

Private Sub UserControl_InitProperties()
    UserControl_Resize
End Sub

Private Sub UserControl_ReadProperties(PropBag As PropertyBag)
    UserControl_Resize
End Sub

Private Sub UserControl_Resize()
    Dim intMinSize As Integer
    UserControl.BackColor = UserControl.MaskColor
    If UserControl.ScaleWidth <= UserControl.ScaleHeight Then
        intMinSize = UserControl.ScaleWidth \ 2
    Else
        intMinSize = UserControl.ScaleHeight \ 2
    End If
    DrawArc UserControl.hdc, UserControl.ScaleWidth \ 2, UserControl.ScaleHeight \ 2, 0, 360, intMinSize
    Set UserControl.MaskPicture = UserControl.Image
    UserControl.BackColor = vbRed
End Sub

Also you must set BackStyle of the control to Transparent and FillStyle to Solid. And AutoRedraw = True as well.


This method "naturally" allows for any shape.


Edit!
As for clicking, you can create an invisible image where you draw click areas, you can use different colors for that, like blue for some area and green for another. Then when you're clicking on the control you look at the invisible image to see what was actually pushed.

[Merri]

Here is a slight modification: it makes a hole in to the control

Private Sub UserControl_Resize()
    Dim intMinSize As Integer
    UserControl.BackColor = UserControl.MaskColor
    UserControl.FillColor = vbBlack
    If UserControl.ScaleWidth <= UserControl.ScaleHeight Then
        intMinSize = UserControl.ScaleWidth \ 2
    Else
        intMinSize = UserControl.ScaleHeight \ 2
    End If
    DrawArc UserControl.hdc, UserControl.ScaleWidth \ 2, UserControl.ScaleHeight \ 2, 0, 360, intMinSize
    UserControl.FillColor = UserControl.MaskColor
    DrawArc UserControl.hdc, UserControl.ScaleWidth \ 2, UserControl.ScaleHeight \ 2, 0, 360, intMinSize \ 2
    Set UserControl.MaskPicture = UserControl.Image
    UserControl.BackColor = vbRed
End Sub

And as you can see, you can see and click the other controls through the control.

[khanjan_a2k]

Sorry for the stupid question... but you want me to create a project, add the UserControl, then paste the code into UserControl1 and then use a UserControl1.Show command to show the usercontrol???

[Merri]

I just made a sample for demonstration purposes so that you can see how it works

So all you need to do:

• Start a new normal project
• Add empty usercontrol
• Change AutoRedraw = True, BackStyle = Transparent and FillStyle = Solid
• Paste the usercontrol code and close the usercontrol
• Now put a command button or any other control on the form
• Put the usercontrol on the form on top of the command button
• You can see the effect

[khanjan_a2k]

Well I am getting an error: "Client site not available"

The error is occuring with the following line:

DrawArc UserControl.hdc, UserControl.ScaleWidth \ 2, UserControl.ScaleHeight \ 2, 0, 360, intMinSize

The error occurs when I try to add the UserControl to the form.

Khanjan

[Merri]

Humm, probably my mistake, remove code from UserControl_InitProperties.

[khanjan_a2k]

Oh sorry about that, I realized that I hadn't closed the designer window... Its not your fault.. By the way, umm... well the thing is that I want to detect the mouse movement over this control and whether it is clockwise or not. To do this, I need the circle to be divided into two halves, so is there any way I could actually find out about the clockwise or counterclockwise movement, or is there a way to make a semi-circle with this...? Sorry I didn't specify this earlier...

[Merri]

If you only need two halves, then your job is really easy: just check if X or Y is bigger than half in MouseMove. As for clockwise and counterclockwise, you can see what the angle is from the midpoint. You should be able to find a lot of examples over here for calculating angles. Just have one extra variable that holds information about old angle and compare it to the new angle value to know if last movement has been clockwise or counterclockwise.