Expert in Regions? Oooh Fun!

I created a complex region using createroundrectrgn and createpolygonrgn and then used combinergn to merge the two regions. Now I want to SetWindowRgn but it keeps returning 0.

I know that regions can be complicated, I might just be missing something.

Here is my Function....

Function CreateWindow() As Long
Dim RoundRgn As Long, PolyRgn As Long
Dim CombRgn As Long, NullRgn As Long
Dim Vertices(2) As POINT_TYPE
RoundRgn = CreateRoundRectRgn(20, 20, 150, 150, 10, 10)
Vertices(0).x = 45: Vertices(0).y = 150
Vertices(1).x = 85: Vertices(1).y = 150
Vertices(2).x = 200: Vertices(2).y = 200
PolyRgn = CreatePolygonRgn(Vertices(0), 3, WINDING)
NullRgn = CreateRectRgn(0, 0, 0, 0)
CombRgn = CombineRgn(NullRgn, RoundRgn, PolyRgn, RGN_AND)
CreateWindow = SetWindowRgn(Form1.hWnd, CombRgn, True)
DeleteObject RoundRgn
DeleteObject PolyRgn
DeleteObject CombRgn
DeleteObject NullRgn
End Function

Any ideas?

I am not sure but:

VB Code:

Function CreateWindow() As Long 
    Dim RoundRgn As Long, PolyRgn As Long 
    Dim CombRgn As Long
    Dim Vertices(2) As POINT_TYPE 
    RoundRgn = CreateRoundRectRgn(20, 20, 150, 150, 10, 10) 
    Vertices(0).x = 45: Vertices(0).y = 150 
    Vertices(1).x = 85: Vertices(1).y = 150 
    Vertices(2).x = 200: Vertices(2).y = 200 
    PolyRgn = CreatePolygonRgn(Vertices(0), 3, WINDING) 
    [b]CombRgn[/b] = CreateRectRgn(0, 0, 0, 0) 
    [b]ret[/b] = CombineRgn([b]CombRgn[/b], RoundRgn, PolyRgn, RGN_AND) 
    CreateWindow = SetWindowRgn(Form1.hWnd, CombRgn, True) 
    DeleteObject RoundRgn 
    DeleteObject PolyRgn 
    DeleteObject CombRgn
End Function

Nice catch but still no go...now the form just dissappears!

Well then you need to fiddle with your regions :eek: What is ret returning? What shape are you going for?

Thanks for your help...CombineRgn returned Null. Thanks

This works for me:

VB Code:

Private Type POINTAPI
    x As Long
    y As Long
End Type
Function CreateWindow() As Long
    Dim RoundRgn As Long, PolyRgn As Long
    Dim CombRgn As Long
    Dim Vertices(2) As [b]POINTAPI[/b]
    RoundRgn = CreateRoundRectRgn(20, 20, [b]250, 250[/b], 10, 10)
    Vertices(0).x = 45: Vertices(0).y = 150
    Vertices(1).x = 85: Vertices(1).y = 150
    Vertices(2).x = 200: Vertices(2).y = 200
    PolyRgn = CreatePolygonRgn(Vertices(0), 3, WINDING)
    CombRgn = CreateRectRgn(0, 0, 0, 0)
    ret = CombineRgn(CombRgn, RoundRgn, PolyRgn, RGN_AND)
    CreateWindow = SetWindowRgn(Form1.hWnd, CombRgn, True)
    DeleteObject RoundRgn
    DeleteObject PolyRgn
    DeleteObject CombRgn
End Function

I have change the values in bold because the 2 regions you originally created weren't overlapping. I am using POINTAPI because I could not find the declaration for the type you were using although it is probably exactly the same.

Are you trying to make speech bubble? If yes you need to use:

VB Code:

Private Const RGN_OR As Long = 2
ret = CombineRgn(CombRgn, RoundRgn, PolyRgn, [b]RGN_OR[/b])

Thanks. Everythings cool now. Realized my mistake.

Actually, do you know if you can change the color of a region before you apply it to a form. Like blue or red or something. I tried using fillrgn but couldn't see a change.

C