GBmp GDIPLUS

[Silvio.Falconi]

I use Gbmp class to load a PNG FILE

and I use drawimage to show the image

oGraphics:DrawImage( aImages[i] , 1, aPos[i] )

the background of the image is white

how I can make to make it transparent ?

oPen := Pen():New( 255, 0, 0, 255 ) // nTransparency, nRed, nGreen, nBlue

where I must insert oPen ?

[ukoenig]

Silvio,

I tested all possible combinations.
I couldn't find any painting-problem.
Transparent PNG on image, lines, ellipse, rects ....
colored circles with defined transparent works as well ( red border with green )



best regards
Uwe

[Silvio.Falconi]

Uwe,

I tried but at init run ok the transparent





then when I call the animation all is wrong

[ukoenig]

Silvio,

on init the first positions of the images are shown.
Next You move the images on a painted background of the images shown at startup.
Because the images are transparent, the not covered images BEHIND the new ones are shown.
It will only work, if You RESTORE the original brush of the window or dialog inside the used area
BEFORE painting new images.
Using Your sample, You can REFILL the used area with green, before painting the new images.
It can be a colored bitmap ( green ) with the size of the used area.
A other solution : a colored background of the images ( green )
It can be done easy with PIXELFORMER.

best regards
Uwe

[ukoenig]

viewtopic.php?f=3&t=31949