summaryrefslogtreecommitdiff
path: root/Master/texmf/asymptote/labelpath3.asy
diff options
context:
space:
mode:
Diffstat (limited to 'Master/texmf/asymptote/labelpath3.asy')
-rw-r--r--Master/texmf/asymptote/labelpath3.asy83
1 files changed, 0 insertions, 83 deletions
diff --git a/Master/texmf/asymptote/labelpath3.asy b/Master/texmf/asymptote/labelpath3.asy
deleted file mode 100644
index 63b2290f1f2..00000000000
--- a/Master/texmf/asymptote/labelpath3.asy
+++ /dev/null
@@ -1,83 +0,0 @@
-// Fit a label to a path3.
-// Author: Jens Schwaiger
-
-import three;
-private real eps=100*realEpsilon;
-
-triple nextnormal(triple p, triple q)
-{
- triple nw=p-(dot(p,q)*q);
- return abs(nw) < 0.0001 ? p : unit(nw);
-}
-
-triple[] firstframe(path3 p, triple optional=O)
-{
- triple[] start=new triple[3];
- start[0]=dir(p,reltime(p,0));
- start[1]=(abs(cross(start[0],optional)) < eps) ? perp(start[0]) :
- unit(cross(start[0],optional));
- start[2]=cross(start[0],start[1]);
- return start;
-}
-
-// Modification of the bishop frame construction contained in
-// space_tube.asy (from Philippe Ivaldi's modules).
-// For noncyclic path3s only
-triple[] nextframe(path3 p, real reltimestart, triple[] start, real
- reltimeend, int subdiv=20)
-{
- triple[][] bf=new triple[subdiv+1][3];
- real lg=reltimeend-reltimestart;
- if(lg <= 0) return start;
- bf[0]=start;
- int n=subdiv+1;
- for(int i=1; i < n; ++i)
- bf[i][0]=dir(p,reltime(p,reltimestart+(i/subdiv)*lg));
-
- for(int i=1; i < n; ++i) {
- bf[i][1]=nextnormal(bf[i-1][1],bf[i][0]);
- bf[i][2]=cross(bf[i][0],bf[i][1]);
- }
- return bf[subdiv];
-}
-
-surface labelpath(string s, path3 p, real angle=90, triple optional=O)
-{
- real Cos=Cos(angle);
- real Sin=Sin(angle);
- path[] text=texpath(Label(s,(0,0),Align,basealign));
- text=scale(1/(max(text).x-min(text).x))*text;
- path[][] decompose=containmentTree(text);
-
- real[][] xpos=new real[decompose.length][2];
- surface sf;
- for(int i=0; i < decompose.length; ++i) {// Identify positions along x-axis
- xpos[i][1]=i;
- real pos0=0.5(max(decompose[i]).x+min(decompose[i]).x);
- xpos[i][0]=pos0;
- }
- xpos=sort(xpos); // sort by distance from 0;
- triple[] pos=new triple[decompose.length];
- real lg=arclength(p);
- //create frames;
- triple[] first=firstframe(p,optional);
- triple[] t0=first;
- real tm0=0;
- triple[][] bfr=new triple[decompose.length][3];
- for(int j=0; j < decompose.length; ++j) {
- bfr[j]=nextframe(p,tm0,t0,xpos[j][0]);
- tm0=xpos[j][0]; t0=bfr[j];
- }
- transform3[] mt=new transform3[bfr.length];
- for(int j=0; j < bfr.length; ++j) {
- triple f2=Cos*bfr[j][1]+Sin*bfr[j][2];
- triple f3=Sin*bfr[j][1]+Cos*bfr[j][2];
- mt[j]=shift(relpoint(p,xpos[j][0]))*transform3(bfr[j][0],f2,f3);
- }
- for(int j=0; j < bfr.length; ++j) {
- path[] dc=decompose[(int) xpos[j][1]];
- pair pos0=(0.5(max(dc).x+min(dc).x),0);
- sf.append(mt[j]*surface(scale(lg)*shift(-pos0)*dc));
- }
- return sf;
-}