New hot-keys in graphics window --

   ?      print help message for hot keys
   ctrl-S toggle stereo left/right eyes
Safer sprintf for subcam report.

src/partiview.cc

@@ -187,7 +187,7 @@ void pp_cmd_cb( HistInput* inp, void * ) {
 
 
 static enum Gv_Nav codes[] = { GV_FLY, GV_ORBIT, GV_ROTATE, GV_TRANSLATE };
-static char *navtitles[] =   {"[f]ly","[o]rbit","[r]ot","[t]ran"};
+static const char *navtitles[] =   {"[f]ly","[o]rbit","[r]ot","[t]ran"};
 
 void pp_nav_init(Fl_Menu_Button *m) {
   m->add("[f]ly|[o]rbit|[r]ot|[t]ran");
@@ -352,6 +352,24 @@ void pp_play_cb( Fl_Button *play, struct stuff ** ) {
   }
 }
 
+static const char *viewhelp[] = { 
+    "[?] this help",
+    "<Tab> focus on command-input box",
+    "[f]ly [o]rbit [r]ot [t]ranslate - left-mouse-drag motion modes",
+    "Ctrl-left-drag: alternate (\"pan\" in orbit mode; axis-constrained in rot/trans)",
+    "Middle-drag (or Option-left): forward/back (orbit/fly/trans), rotate in screen plane (rot)",
+    "Right-click: pick object   Shift-right-click: pick object, set new center",
+    "[p] pick object under cursor  [P] pick object and set new center",
+    "[v] zoom out    [V] zoom in (optional fovy prefix, e.g. \"42.5v\")",
+    "[{] animate backward  [}] animate forward [~] toggle fwd/back",
+    "[z] 2x slower   [Z] 2x faster",
+    "[<] step backward [>] step forward (optional delta-time prefix)",
+    "[s] stereo on/off (optional stereosep prefix, e.g. \"-.02s\")",
+    "[ctrl-s] toggle left/right eye of stereo view",
+    "[ctrl-t] report frame rate",
+    "[PrtSc] take image snapshot",
+};
+
 int pp_viewevent_cb( Fl_Gview *view, int ev ) {
   char snapinfo[1024];
   int fno;
@@ -379,6 +397,11 @@ int pp_viewevent_cb( Fl_Gview *view, int ev ) {
     int key = Fl::event_text()[0];
     switch(key) {
 
+    case '?':
+	for(int i = 0; i < COUNT(viewhelp); i++)
+	    msg(" %s", viewhelp[i]);
+	return 1;
+
     case '\t':
 	if(!ppui.cmdhist || !ppui.cmdhist->input())
 	    return 0;
@@ -399,8 +422,15 @@ int pp_viewevent_cb( Fl_Gview *view, int ev ) {
 	} else {
 	    parti_stereo( view->stereo()==GV_MONO ? "on" : "off" );
 	}
-	msg("stereo %s (focallen %g)",
-		parti_stereo(NULL), view->focallen());
+	msg("stereo %s (focallen %g)", parti_stereo(NULL), view->focallen());
+	return 1;
+
+    case CTRL('S'):
+	if(strstr(parti_stereo(NULL),"left"))
+	    parti_stereo("right");
+	else
+	    parti_stereo("left");
+	msg("stereo %s", parti_stereo(NULL));
 	return 1;
 
     case '>': bump = 1; goto step;
@@ -1003,8 +1033,8 @@ int pp_parse_args( struct stuff **, int argc, char *argv[], char *fromfname, voi
 	index = parti_current_subcam();
 	if(index > 0) {
 	    char params[100];
-	    char *name = parti_get_subcam( index, params );
-	    msg("subcam %s  %s # az el rol  L R B T // subcam -tilt %g", name, params, ppui.sctilt);
+	    const char *name = parti_get_subcam( index, params );
+	    msg("subcam %.30s  %.40s # az el rol  L R B T // subcam -tilt %g", name, params, ppui.sctilt);
 	} else {
 	    int wx, wy;
 	    float hx, hy = .5 * parti_fovy(NULL);