OpenEuphoria

Re: Euveiwer3 questin for Al

• Posted by don cole <doncole at pacbell.net> Nov 14, 2005
• 458 views

Al Getz wrote:
> 
> don cole wrote:
> > 
> > Hello Al,
> > 
> >         retv=win:SetTextColor(hdc,#FFA0FF)--violet
> >         retv=win:SetBkColor(hdc,TRANSPARENT)--
> >     TextOutEx(hdc,LeftMargin,TopMargin,"my stuff")
> > 
> > The text background color comes up Black.
> > 
> > How can I make it transparent or whatever the picture color is behind it?
> > 
> > I'm working on adding zoom.
> > 
> > Don Cole
> >  A Bug is an un-documented feature.
> > A Feature is a documented Bug.
> 
> Hi there Don,
> 
> 
> Well, there are a few functions to keep in mind when writing
> text...
> 
>   SetTextColor
>   SetBkColor
>   SetBkMode
> 
> SetTextColor  sets the text color (the lettering itself).
> SetBkColor    sets the background color where the text itself prints
>               (but only if mode=OPAQUE).
> SetBkMode     sets the mode, and the mode determines if the background
>               will be colored with the "BkColor", or transparent.
>               SetBkMode with a value of OPAQUE means the back color
>               set with SetBkColor will be painted just behind the text,
>               while using a value of TRANSPARENT means whatever color
>               already exists (from a previous paint) will show behind
>               the text.
> 
> It sounds like you want to make the background mode transparent, so you
> would set the background mode something like this:
> 
> retv=win:SetBkMode(hdc,TRANSPARENT)
> 
> Note that once in the back mode of 'TRANSPARENT' the background
> color setting will not have any effect.  Thus in the two lines:
> 
>   retv=win:SetBkMode(hdc,TRANSPARENT)
>   retv=win:SetBkColor(hdc,#FFFFFF)
> 
>   SetBkColor wont have any effect in your app (still sets it however)
>   unless SetBkMode is called later with a value of OPAQUE instead
>   of TRANSPARENT, because TRANSPARENT effectively says "dont use back
>   color and allow previous back paint to show through" while 
>   OPAQUE says "use the back color, overwriting previous back paint
>   wherever text is drawn".
> 
> Note also that these commands operate within the context of an hdc
> (as im sure you noted already) so that they must be repeated for
> any newly obtained hdc, such as when a BeginPaint command is called
> or within an onPaint event.  You probably know this already but i
> just wanted to mention it so no problems develop down the road for
> anyone else that might be interested also.
> 
> As a last note, you may wish to look up the functions i've mentioned
> in order to check their spelling and parameter accuracy in case i made
> a mistake typing them out.
> 
> 
> Take care,
> Al
> 
> And, good luck with your Euphoria programming!
> 
> My bumper sticker: "I brake for LED's"

Yes Thank you Al ,

I was confusing mode with color.

TRANSARENT is a mode not a color.

Don Cole
 A Bug is an un-documented feature.
A Feature is a documented Bug.