On Wed, Sep 12, 2007 at 10:12:46AM -0400, Webb Roberts wrote:
> What is the easiest way to get a Venn diagram in Groff? Pic doesn't
> seem to like overlapping shapes.
You can get away with hatching.
I attached the file that does a simple variant of that.
Best regards,
Zvezdan
.PS
.fam H
define hatch_circle {
pi = atan2(0, -1)
start = $1
end = start + 6
opposite = 2 * start + 16
for i = start to end do {
dxr = circlerad * cos(i * pi/16)
dyr = circlerad * sin(i * pi/16)
dxl = circlerad * cos((opposite-i) * pi/16)
dyl = circlerad * sin((opposite-i) * pi/16)
line from last circle.c + (dxr, dyr) \
to last circle.c + (dxl, dyl) colour "$2"
line from last circle.c + (-dxr, -dyr) \
to last circle.c + (-dxl, -dyl) colour "$2"
}
}
circle outline "red"
hatch_circle(0, red)
circle with .c at last circle.c + (circlerad, 0) outline "blue"
hatch_circle(4, blue)
circle with .c at last circle.c + (-circlerad/2, -circlerad) outline "green"
hatch_circle(8, green)
.PE
