[Xy-pic] problem with bending arrows
Thierry Masson
thilucmic at yahoo.fr
Fri Mar 9 14:18:40 CET 2007
Hello,
I am trying to understand bending arrows, and the documentations I
find here and there is not clear enough for me! If someone could give
me a very pedestrian introduction, with lot of illustrated exemples,
it would help.
Here is my question.
I have succeed to produce the following diagram:
$
\xymatrix at R=15pt at C=25pt{
{} & {A_0} \ar[d] \ar[r] & {B_0} \ar[d] \ar[r] & {C_0} \ar[d]
\ar@<-0.5pc>`d[dl]+/u0.3pc/ % turn at C1
`[ddl]+/l0.3pc/ % turn at B1
`[ddll]+/u0.3pc/+/l1pc/ % turn at B2
`[dddll]+/l0.2pc/% turn at A2
_-{\partial}%
[dddll]+/l0.2pc/+/u0.5pc/ %
& {} \\
{} & {A_1} \ar[d] \ar[r] & {B_1} \ar[d] \ar[r] & {C_1} \ar[d] \ar[r]
& {0} \\
{0} \ar[r] & {A_2} \ar[d] \ar[r] & {B_2} \ar[d] \ar[r] & {C_2} \ar
[d] & {} \\
{} & {A_3} \ar[r] & {B_3} \ar[r] & {C_3}& {}
}
$
I can't understand why the turns at B1 and A2 don't look like the
turns at C1 and B2. I prefer the C1 and B2 turns. How to modify my
diagram to get the same radius at B1 and A2?
I can't understand why the last straight line from A2 to A3 is not
perfectly vertical... What is wrong about my coding?
Thanks for any advise,
Thierry
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