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MAC
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 Posted: Sat Apr 07, 2007 2:14 am Post subject: Stretched TImage |
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Hi All,
I have a TImage that is being stretched to fit a window, I want to select
certain pixels in the image how do I go about doing this. What I want to
know is how do I get the coordinates where I clicked to match that of the
stretched TImage.
Regards
MAC |
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Remy Lebeau (TeamB)
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| Posted: Sat Apr 07, 2007 2:29 am Post subject: Re: Stretched TImage |
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"MAC" <none (AT) none (DOT) com> wrote in message
news:4616b831 (AT) newsgroups (DOT) borland.com...
| Quote: | I have a TImage that is being stretched to fit a window, I want
to select certain pixels in the image how do I go about doing this.
What I want to know is how do I get the coordinates where I
clicked to match that of the stretched TImage.
|
You have access to the Width/Height of the TImage and the Width/Height
of the original graphic. The mouse coordinates are within the
TImage's stretched area, so a simple algebraic calculation can convert
the TImage coordinates into TGraphic coordinates. For example:
void __fastcall TForm1::Image1MouseDown(TObject* Sender,
TMouseButton Button, TShiftState Shift, int X, int Y)
{
int PixelX = ((Image1->Picture->Width * X) / Image1->Width);
int PixelY = ((Image1->Picture->Height * Y) / Image1->Height);
// access the Pixel at PixelX,PixelY as needed...
}
Alternatively:
void __fastcall TForm1::Image1MouseDown(TObject* Sender,
TMouseButton Button, TShiftState Shift, int X, int Y)
{
int PixelX = ((Image1->Width / Image1->Picture->Width) * X);
int PixelY = ((Image1->Height / Image1->Picture->Height) * Y);
// access the Pixel at PixelX,PixelY as needed...
}
Gambit |
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MAC
Guest
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| Posted: Sat Apr 07, 2007 4:07 am Post subject: Re: Stretched TImage |
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Thanks
"Remy Lebeau (TeamB)" <no.spam (AT) no (DOT) spam.com> wrote in message
news:4616bbb2$1 (AT) newsgroups (DOT) borland.com...
| Quote: |
"MAC" <none (AT) none (DOT) com> wrote in message
news:4616b831 (AT) newsgroups (DOT) borland.com...
I have a TImage that is being stretched to fit a window, I want
to select certain pixels in the image how do I go about doing this.
What I want to know is how do I get the coordinates where I
clicked to match that of the stretched TImage.
You have access to the Width/Height of the TImage and the Width/Height
of the original graphic. The mouse coordinates are within the
TImage's stretched area, so a simple algebraic calculation can convert
the TImage coordinates into TGraphic coordinates. For example:
void __fastcall TForm1::Image1MouseDown(TObject* Sender,
TMouseButton Button, TShiftState Shift, int X, int Y)
{
int PixelX = ((Image1->Picture->Width * X) / Image1->Width);
int PixelY = ((Image1->Picture->Height * Y) / Image1->Height);
// access the Pixel at PixelX,PixelY as needed...
}
Alternatively:
void __fastcall TForm1::Image1MouseDown(TObject* Sender,
TMouseButton Button, TShiftState Shift, int X, int Y)
{
int PixelX = ((Image1->Width / Image1->Picture->Width) * X);
int PixelY = ((Image1->Height / Image1->Picture->Height) * Y);
// access the Pixel at PixelX,PixelY as needed...
}
Gambit
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