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detecting click

Posted on 2002-03-13
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Last Modified: 2010-05-02
hi is there anyway to detect click within shapes object ?
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Question by:prinx
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by:nahumd
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no
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by:Ryan Chong
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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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by:tomnich
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To get ryancys code to work you must set the Form's key preview property to true
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by:Ryan Chong
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> 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..
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by:Ryan Chong
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> 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..
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by:Ryan Chong
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sorry for the double posts..
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by:prinx
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would it work if the shapes an oval ?
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by:Arthur_Wood
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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
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by:Ryan Chong
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APIs will do but i don't have resources, sorry..
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by:prinx
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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 ?
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by:rspahitz
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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.
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by:bill02
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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.
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by:prinx
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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 ?
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Ryan Chong earned 100 total points
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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

Private Sub Form_Load()
    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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