picture transpaence in canvas mode?

[largo_winch]

How I can make a picture (*.bmp, *jpg) transparent in canvas mode? It's possible with current thinbasic version to store two pictures over one place (with magenta trick?) ? bye, largo

[ErosOlmi]

Hi Largo,

no I'm sorry but at the moment there is no a native command able to do that job.
I will see what I can do in next thinBasic version.

Eros

[Charles Pegge]

I think this is a job for GDIplus. Will you support a GDIp canvas in thinBasic 2.0, Eros?

[ErosOlmi]

GdiPlus module sure. A pseudo basic version has always been there in thinbasic distribution.
A GdiPlus Canvas native control ... maybe

[Petr Schreiber]

If you don't need ultrafast solution, you can have a look at:
/SampleScripts/UI/Canvas/Image_Background/Image_Background.tBasic

...which shows approach with magenta masked images on canvas.

If you need solid speed for thousands of transparent, I would recommend to jump over GDI Plus straight to the realm of GPUs and try alpha masking / alpha blending.
In ThinBASIC, you can use pure OpenGL for this, or for better comfort TBGL. When you look at TBGL_LoadTexture command, you will see you can specify optional transparent color.

Other approach would be using Mike's sprite functions, have a look at examples under:
/SampleScripts/TBGL/Sprites/


Petr

[ErosOlmi]

Hi Petr,

thanks and sorry: I forgot about the "Quick and dirty approach" example you developed

Ciao
Eros