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authorKarl Berry <karl@freefriends.org>2009-05-16 00:19:13 +0000
committerKarl Berry <karl@freefriends.org>2009-05-16 00:19:13 +0000
commitbab45528d65eaafe68a705dbb2a57075c7b7cbd8 (patch)
tree10b4ae2b5195c8dede153ab89359ec00f55f325f /Build/source/utils/asymptote/base/plain_arcs.asy
parent8643d90372e9c31e0f461c15c596b60a545bd7d3 (diff)
asymptote 1.72 sources (not integrated into build yet)
git-svn-id: svn://tug.org/texlive/trunk@13110 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/utils/asymptote/base/plain_arcs.asy')
-rw-r--r--Build/source/utils/asymptote/base/plain_arcs.asy43
1 files changed, 43 insertions, 0 deletions
diff --git a/Build/source/utils/asymptote/base/plain_arcs.asy b/Build/source/utils/asymptote/base/plain_arcs.asy
new file mode 100644
index 00000000000..01e750f42cd
--- /dev/null
+++ b/Build/source/utils/asymptote/base/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);
+}