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On Sun, 22 Jan 2017 22:39:53 -0500 Rik Kabel >
wrote: > >> So, how can I make the inner glyph (‘?’ in the example below) >> transparent, so that the background shows through along with >> anything else that lives on a lower layer? I’ve seen a method for >> constructed shapes, but nothing On 2017-01-23 00:06, Alan Braslau wrote: that I can apply to text glyphs. >> Undraw doesn’t do it. > > Undraw is simply draw using the background color. > > Transparency is a MetaFun extension to MetaPost (so part of > ConTeXt). > > draw q withtransparency (1,0.5) ; % (method,transparency) > > Alan
Hmmm. That does not work for me (with any of many method and transparency values). The ‘?’ is solid black. I do see a message in the log that looks related:
mkiv lua stats > page group warning: transparencies are used but no pagecolormodel is set
but adding \setcolors[state=start,cmyk=yes] does not change that; both the warning and the solid black glyph remain. Could this be an issue of the PDF viewer? Is it a font issue? Okay, I got a clean compile using \definecolor and referencing that in
On 2017-01-23 14:09, Rik Kabel wrote: the MP page. \setupbackgrounds [page] [background=color,backgroundcolor=yellow] \definecolor[Transp][r=1,t=0,a=12] \definefont [DVSrB] [file:DejaVuSerif-Bold.ttf] \startuseMPgraphic{HeartTest 1} picture h,q ; h := "♥" infont "\truefontname{DejaVuSerif-Bold.ttf}" scaled 20 ; q := textext("{\DVSrB ?}") scaled 10 ; q := q shifted - (xpart center q, 12pt) ; draw h withcolor blue ; draw q withtransparency(12,0) ; draw q shifted (72pt,0) withtransparency(12,0) ; \stopuseMPgraphic \startuseMPgraphic{HeartTest 2} picture h,q ; h := "♥" infont "\truefontname{DejaVuSerif-Bold.ttf}" scaled 20 ; q := textext("\color[Transp]{\DVSrB ?}") scaled 10 ; q := q shifted - (xpart center q, 12pt) ; draw h withcolor blue ; draw q ; draw q shifted (72pt,0) ; \stopuseMPgraphic \starttext \useMPgraphic{HeartTest 1} \useMPgraphic{HeartTest 2} \stoptext Unfortunately, the result is not what I want. The result is that the “?” disappears, allowing the color directly behind it to show through. The example above shows that it works with \definecolor but not withwithtransparency. I have no idea why, and certainly realize it could be my error. What I want is that the background of the page (yellow in this case) should show through. That is what is done with fill / reverse / cycle, as in: \setupbackgrounds [page] [background=color,backgroundcolor=yellow] \startuseMPgraphic{CircleTest} path p,q ; p := fullcircle scaled 2cm ; q := fullcircle scaled 1cm ; fill p -- reverse q -- cycle withcolor blue; \stopuseMPgraphic \starttext \useMPgraphic{CircleTest} \stoptext where the background color (yellow) comes through the inner circle (path q). Can this be done with text characters? I suspect that the answer is that the glyphs have to be converted to paths and that it will only work when there are no islands (as in ‘P’). -- Rik