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author | Karl Berry <karl@freefriends.org> | 2009-06-08 01:04:41 +0000 |
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committer | Karl Berry <karl@freefriends.org> | 2009-06-08 01:04:41 +0000 |
commit | efda44c2e2e6bd08bf58ebdfb2f1879cff9e6f37 (patch) | |
tree | 105b5092688d84851b40816150f4a5c77df3ed08 /Master/texmf/asymptote/plain_arcs.asy | |
parent | 9e32dd6aee7faf4e59888cfbd7a927d497b563ad (diff) |
first commit of asymptote binaries + support
git-svn-id: svn://tug.org/texlive/trunk@13665 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Master/texmf/asymptote/plain_arcs.asy')
-rw-r--r-- | Master/texmf/asymptote/plain_arcs.asy | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/Master/texmf/asymptote/plain_arcs.asy b/Master/texmf/asymptote/plain_arcs.asy new file mode 100644 index 00000000000..01e750f42cd --- /dev/null +++ b/Master/texmf/asymptote/plain_arcs.asy @@ -0,0 +1,43 @@ +bool CCW=true; +bool CW=false; + +path circle(pair c, real r) +{ + return shift(c)*scale(r)*unitcircle; +} + +path ellipse(pair c, real a, real b) +{ + return shift(c)*scale(a,b)*unitcircle; +} + +// return an arc centered at c from pair z1 to z2 (assuming |z2-c|=|z1-c|), +// drawing in the given direction. +path arc(pair c, explicit pair z1, explicit pair z2, bool direction=CCW) +{ + z1 -= c; + real r=abs(z1); + z1=unit(z1); + z2=unit(z2-c); + + real t1=intersect(unitcircle,(0,0)--2*z1)[0]; + real t2=intersect(unitcircle,(0,0)--2*z2)[0]; + static int n=length(unitcircle); + if(t1 >= t2 && direction) t1 -= n; + if(t2 >= t1 && !direction) t2 -= n; + return shift(c)*scale(r)*subpath(unitcircle,t1,t2); +} + +// return an arc centered at c with radius r from angle1 to angle2 in degrees, +// drawing in the given direction. +path arc(pair c, real r, real angle1, real angle2, bool direction) +{ + return arc(c,c+r*dir(angle1),c+r*dir(angle2),direction); +} + +// return an arc centered at c with radius r > 0 from angle1 to angle2 in +// degrees, drawing counterclockwise if angle2 >= angle1 (otherwise clockwise). +path arc(pair c, real r, real angle1, real angle2) +{ + return arc(c,r,angle1,angle2,angle2 >= angle1 ? CCW : CW); +} |