On 4/9/2020 4:58 PM, Gerben Wierda wrote:
\starttext
\startMPpage[instance=doublefun]
vardef Foo( expr w, h, fillColor, fillTransparency) =
show "FOO:", w, h, fillColor, fillTransparency;
save pic; picture pic;
save circ; path circ;
circ := (fullcircle xyscaled (h,h));
pic := image (
fill (circ shifted (w-h/2,-h/2)) withcolor fillColor withtransparency fillTransparency;
);
pic
enddef;
pic := Foo( 150, 50, (0.686,1.000,1.000), (1,1.000));
draw pic;
\stopMPpage
\stoptext
Maybe this definition is better then but I need to test it more
\starttext
\startMPpage[instance=doublefun]
def withtransparency expr t =
if pair t :
withprescript "tr_alternative=" & decimal transparency_alternative_to_number(xpart t)
withprescript "tr_transparency=" & decimal ypart t
else :
mfun_with_transparency (transparency_alternative_to_number(t))
fi
enddef ;
def mfun_with_transparency (expr a) expr t =
withprescript "tr_alternative=" & decimal a
withprescript "tr_transparency=" & decimal t
enddef ;
vardef Foo ( expr w, h, fillColor, fillTransparency) =
image (
fill fullcircle xyscaled (h,h) shifted (w-h/2,-h/2)
withcolor fillColor
withtransparency fillTransparency
;
)
enddef;
vardef FooX ( expr w, h, fillColor) =
image (
fill fullcircle xyscaled (h,h) shifted (w-h/2,-h/2)
withcolor fillColor
withtransparency (normaltransparent, .5)
;
)
enddef;
vardef FooY ( expr w, h, fillColor) =
image (
fill fullcircle xyscaled (h,h) shifted (w-h/2,-h/2)
withcolor fillColor
withtransparency normaltransparent .5
;
)
enddef;
draw Foo ( 350, 50, (0.5,1,0), (1,.5));
draw FooX ( 250, 50, (1,0.5,1));
draw FooY ( 150, 50, (1,1,0.5));
\stopMPpage
\stoptext
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