Board index » cppbuilder » Transparent Color of TImage, as i want...

2004-05-08 03:37:26 PM
cppbuilder97
The color of the left-bottom pixel of a TImage is the
Transparent color of the image when "Transparent = true", i
think that it's VERY restricting! sometimes i need to put an
image on the Form and i want that only the middle of the image
will be transparent (like a hole) and that the left-bottom
pixel will not be transparent.
So... the question is how actually do i tell the TImage what
color i want to be transparent, WITH NO ANY CONNECTION to the
pixel in the corner, my logic say that it's possible, becouse
the image must have some Veriable where it's keeping the color
which is the "Transparent Color" , so why can't i change it to
other value from inside my code?
Thanks,
Ramy.
 

Ramy wrote:
the TransparentMode and TransparentColor properties to specify which
color is used for transparency.
For example:
Graphics::TBitmap* bmp = Image1->Picture->Bitmap;
if (bmp)
{
bmp->TransparentMode = tmFixed;
bmp->TransparentColor = clWhite;
bmp->Transparent = true;
}
Replace clWhite with the color you want to make transparent, of course.
--
Corey Murtagh
The Electric Monk
"Quidquid latine dictum sit, altum viditur!"
 

Hi, i'm not sure if this is what i need, becouse if i'll copy
bmp (from your example) back to the TImage on the Form, it will
still use the Left-Bottom pixel as the transparent color.
Ramy

{smallsort}

Ramy wrote:
pointer to access the internal bitmap of the TImage. It certainly does
work on BCB4.
To test I created an application, dropped a TImage and TButton on the
form, loaded a black and white image into the TImage and set its
Transparent property to true, then added a click handler for the button
like this:
void __fastcall TForm1::Button1Click(TObject *Sender)
{
Graphics::TBitmap* bmp = Image1->Picture->Bitmap;
if (bmp)
{
bmp->TransparentMode = tmFixed;
bmp->TransparentColor = clWhite;
}
}
On running the program and clicking the button, the black areas (which
were formerly transparent, since the bottom-left pixel is black) became
solid and the white areas disappeared.
--
Corey Murtagh
The Electric Monk
"Quidquid latine dictum sit, altum viditur!"
 

Hmmm thanks very much! now i understand it, very nice method,
thanks again i'll use it!
Ramy

Corey Murtagh < XXXX@XXXXX.COM >wrote:
~ JD
 

JD wrote:
A close idomatic translation:
"Anything that is said in Latin sounds profound!"
--
Corey Murtagh
The Electric Monk
"Quidquid latine dictum sit, altum viditur!"