Animazione con bitmap

[Pier Luigi]

In un programma ho inserito una breve animazione utilizzando una serie di bitmap unitamente alla funzione SetBmp. Funziona egregiamente, ma durante l'animazione, l'immagine "sfarfalla", "lampeggia" (non so come definirla). E' possibile eliminare questo fenomeno?

Grazie.
Pier Luigi

[Antonio Linares]

Pier,

Are you using XP themes ? Are the images painted transparently ?

[Pier Luigi]

Yes, I use XP themes and the image is painted transparently.

Pier Luigi

[Antonio Linares]

Pier,

I guess that you mean "flickering". If yes, then Class TBitmap already uses "double buffer" painting technique to avoid the flickering.

Please check if your source\classes\bitmap.prg file contains these lines:

Code: Select all

METHOD Paint() CLASS TBitmap

   local aInfo := ::DispBegin()
   ...

[Enrico Maria Giordano]

Con un esempio minimale del problema sarebbe più facile aiutarti.

EMG

[Antonio Linares]

Dear Enrico,

Your mail server has blocked ours again:
<e.m.giordano@alice.it>:
85.33.2.53 does not like recipient.
Remote host said: 550 5.7.1 213.149.226.3 has been blocked by abuseat
Giving up on 85.33.2.53.

so the forums can't notify you again. You could get a new gmail account

[Pier Luigi]

Antonio,

It is ok! I used one old version of Bitmap class

One question:

I would want the resize of a bitmap.
Can I use the function ::DispBegin() with WndSetSize() to avoid the "flickering" ?

For example:

aInfo := oBmp:DispBegin()
WndSetSize( oBmp:hWnd, nWidth, nHeight, .t. )
...

Regards
Pier Luigi

[Antonio Linares]

Pier,

The double buffer painting is only required at the Paint() method. If you resize the control, it should not flick