From: ian <ian>
Date: Wed, 2 Jan 2008 01:33:59 +0000 (+0000)
Subject: pointmap command for use by moebius2
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=moebius.git;a=commitdiff_plain;h=3341494a1fe1979641c49c65c7f09319b9eca659

pointmap command for use by moebius2
---

diff --git a/library.hh b/library.hh
index bb226dd..e122a9d 100644
--- a/library.hh
+++ b/library.hh
@@ -57,6 +57,7 @@ public:
   double& operator[](int i) { return xyz[i]; }
 
   operator Onscreen() const;
+  Point halftransformed() const { return usertransforms(*this); }
   Point transformed() const { return povtransform(usertransforms(*this)); }
   double index() const { return transformed()[2]; }
 
diff --git a/main.cc b/main.cc
index 5a35b45..645d93a 100644
--- a/main.cc
+++ b/main.cc
@@ -101,9 +101,11 @@ SortedCellList *list=0;
 X11Output *x11= 0;
 DualX11Output *dualx11= 0;
 
+static Moebius *strip= 0;
+
 void generate() {
   if (list) delete list;
-  Moebius *strip;
+  if (strip) { delete strip; strip= 0; }
   switch (version) {
   case 0: strip= new MoebiusStrip(width);                           break;
   case 1: strip= new MoebiusEnfoldment(thickness,bottomportion);    break;
@@ -130,11 +132,12 @@ void generate() {
     }
     t0= t1;
   }
-  delete strip;
 }
 
 int main(int argc, char **argv) {
+  static const char pointmap_cmd[]= "pointmap ";
   char buf[100];
+  double pointmap_t, pointmap_u;
 
   for (;;) {
     Point::setobserver(theta,eta,planedistance,eyedistance,cutoffdistance);
@@ -200,6 +203,15 @@ int main(int argc, char **argv) {
         AnyParameter::help();
       } else if (!strcmp(buf,"help")) {
         AnyParameter::list();
+      } else if (!strncmp(buf,pointmap_cmd,sizeof(pointmap_cmd)-1)) {
+	if (sscanf(buf+sizeof(pointmap_cmd)-1, "%lf %lf",
+		   &pointmap_t, &pointmap_u) != 2) {
+	  cerr << "failed to parse pointmap args\n";
+	  continue;
+	}
+	Point p= strip->middlepoint(pointmap_t,pointmap_u);
+	cout << "\n";
+	for (int i=0; i<3; i++) cout << p.halftransformed()[i] << "\n";
       } else if (!*buf) {
         break;
       } else {