How To Mask A Color?

[Quadamage]

well... I am using bitblt, how would I mask a color? Cause when the ships over lap in this simple little spaceship game it looks real funny..

[rampagefreak]

just bitblt a mask (white background, ship figure in all black) with the option (instead of srccopy) SrcAnd and then bitblt your figure (ship) with an all black background. consts for differents options: Public Const SRCAND = &H8800C6
Public Const SRCCOPY = &HCC0020
Public Const SRCINVERT = &H660046
It works best when you bitblt on a buffer .hdc first and then copy the hdc to screen.
I hope this can be of help to you

[rampagefreak]

i forgot to say that the ship figure has to be bitblt with the srcinvert option

[Quadamage]

Sweet, thnx! heeh first time i bitbltted the ship first, and nothing showed up.. but i got it :P

[Fox]

No need to declare the blitting operators, they're all pre-defined in VB:

vbSrcPaint
vbSrcAnd
vbSrcCopy
aso.

[Quadamage]

yeah, that' how i usually do it.

I got another question, I think is simple but I'm not sure; how do I make something partially transpearent?

[Fox]

What you can do using BitBlt is a 1-Bit-mask, meaning 100% or 0% visible (nothing between). Search the forums for Transparent blitting or look at the demos on my website ( http://fox.acky.net/vb/ ). If you need translucency I'd recommend you using DDraw because it's way faster. Again there are enough examples around so you might just want to search the forum for this one.

[Gaming_World]

You can use a gray-based mask for partail transperancy. Ue vbSrcAnd for the mask, and vbSrcPaint for the sprite (ship).

[Fox]

Well you can't. The funtions give you something like transluency but it's not what you need I s'pose.

[Sastraxi]

Two things I must point out:

The partial transparency (and it's only partial, it isn't accurate at all) only works with MergePaint/And combo (on many computers I've tested on), and vbMergePaint is the only one that works. The API's MergePaint is incorrect.

[Quadamage]

ok, i have no time to test that greyscale thing tonight, but i will, in the meantime, would you care to explain this mergepoint thing?