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# detecting click

Posted on 2002-03-13
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hi is there anyway to detect click within shapes object ?
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Question by:prinx
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LVL 2

Expert Comment

ID: 6860201
no
0

LVL 52

Expert Comment

ID: 6860224
Hi prinx,

Try the Form_MouseDown Event:

Example:

Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
If X >= Shape1.Left And X <= Shape1.Left + Shape1.Width And Y >= Shape1.Top And Y <= Shape1.Top + Shape1.Height Then
Label1.Caption = "Click inside Shape1"
Else
Label1.Caption = "Click outside Shape1"
End If
End Sub

Hope this help
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LVL 1

Expert Comment

ID: 6860520
To get ryancys code to work you must set the Form's key preview property to true
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LVL 52

Expert Comment

ID: 6860555
> To get ryancys code to work you must set the Form's key preview property to true
That is not true, because i use the Mouse Event, it's no about the key pressing..
0

LVL 52

Expert Comment

ID: 6860557
> To get ryancys code to work you must set the Form's key preview property to true
That is not true, because i use the Mouse Event, it's no about the key pressing..
0

LVL 52

Expert Comment

ID: 6860558
sorry for the double posts..
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Author Comment

ID: 6860566
would it work if the shapes an oval ?
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LVL 44

Expert Comment

ID: 6860649
Prinx,

Even though a Shape's appearance may be other than rectangular, EVERY shape is defined within a rectangular space on the form.  EVERY Shape has  Left, Top, Width and Height properties, which define THAT rectangular space.

What ryancys' solution is testing are those properties, so that if the mouse where in fact pointing INSIDE the rectanlge, but OUTSIDE the actual OVAL shap, you would still detect a "hit" on that Shape (consider the upper Left corner of the rectangle - OUTSIDE the oval, but to the right of the extreme left edge of the Oval, and Below the extreem top edge of the rectangle - this would still be seen, by ryancys' code, as being a hit on THAT Shape (resulting with "Click inside Shape1").

If you wanted to be "more accurate", then you would need some very specific computations to determine if the actual X, and Y of the location of the mouse was truly within the REAL boundaries of the actual object, and that might be VERY VERY complicated.

Arthur Wood
0

LVL 52

Expert Comment

ID: 6860653
APIs will do but i don't have resources, sorry..
0

Author Comment

ID: 6860696
i was tinking about reading pixels off an image to determine hit area..but i can't find any function to do this..anyone has any idea ?
0

LVL 22

Expert Comment

ID: 6861090
What you are describing can be achieved be reading the help files on User Controls, where they give an example of building a user control that has click-event support.  However, that opens up a whole new realm of learning, especially if you want to allow for transparency of the shapes.
0

Expert Comment

ID: 6861209
I would put the shape into a user control then you'll have full control over what happens. you can make it global across all the forms in a project too which helps when you need to make a global change to something. I use them to create my own command buttons that i want more control over and when anything that is going to be repeated in the project several times such as grids and searching functions on that grid. if you need some examples ask ill get you some code.
0

Author Comment

ID: 6863830
PtInRegion
The PtInRegion function determines whether the specified point is inside the specified region.

BOOL PtInRegion(
HRGN hrgn,  // handle to region
int X,      // x-coordinate of point
int Y       // y-coordinate of point
);

hi ..can someone pls teach mi how to declare and use this function in visual basic ?
0

LVL 52

Accepted Solution

Ryan Chong earned 100 total points
ID: 6863969
A modified example from allapi.net , by still Not working well, just a start points for us maybe:

Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Private Declare Function PtInRect Lib "user32" (lpRect As RECT, ByVal x As Long, ByVal y As Long) As Long
Private Declare Function PtInRegion Lib "gdi32" (ByVal hRgn As Long, ByVal x As Long, ByVal y As Long) As Long
Private Declare Function CreateEllipticRgnIndirect Lib "gdi32" (lpRect As RECT) As Long
Private Declare Function SetPixelV Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal crColor As Long) As Long
Private Declare Function SetRect Lib "user32" (lpRect As RECT, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long

Shape1.Shape = 2
End Sub

Private Sub Form_MouseMove(Button As Integer, Shift As Integer, x As Single, y As Single)
Dim mRGN As Long, R As RECT
'Set the graphical mode to persistent
Me.AutoRedraw = True
'Set the rectangle's values
SetRect R, Shape1.Left, Shape1.Top, Shape1.Width, Shape1.Height
'Create an elliptical region
mRGN = CreateEllipticRgnIndirect(R)
If PtInRegion(mRGN, x, y) <> 0 Then
'SetPixelV Me.hdc, x, y, vbGreen
Me.Caption = "Selected"
ElseIf PtInRect(R, x, y) <> 0 Then
'SetPixelV Me.hdc, x, y, vbRed
Me.Caption = "Not Selected"
End If
'DeleteObject mRGN
End Sub
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