ts/stuploxx [FIX]: properly handle picks of nagtive abscissa values

src/ts/stuploxx/scaling.cc

@@ -29,11 +29,12 @@
  * 
  * REVISIONS and CHANGES 
  *  - 29/02/2008   V1.0   Thomas Forbriger
+ *  - 05/01/2017   V1.1   properly handle negative values on abszissa
  * 
  * ============================================================================
  */
 #define STUPLO_SCALING_CC_VERSION \
-  "STUPLO_SCALING_CC   V1.0   "
+  "STUPLO_SCALING_CC   V1.1"
 
 #include <libtime++.h>
 #include "scaling.h"
@@ -68,10 +69,24 @@ namespace stuplo {
 
   void PanelTime::setrange(const pgplot::Trange& range) 
   {
-    libtime::TRelativeTime begin=libtime::double2time(range.min);
-    libtime::TRelativeTime end=libtime::double2time(range.max);
-    libtime::TAbsoluteTime abegin=Mreferencetime+begin;
-    libtime::TAbsoluteTime aend=Mreferencetime+end;
+    libtime::TAbsoluteTime abegin;
+    libtime::TAbsoluteTime aend;
+    if (range.min<0)
+    {
+      abegin=Mreferencetime-libtime::double2time(-range.min);
+    }
+    else
+    {
+      abegin=Mreferencetime+libtime::double2time(range.min);
+    }
+    if (range.max<0)
+    {
+      aend=Mreferencetime-libtime::double2time(-range.max);
+    }
+    else
+    {
+      aend=Mreferencetime+libtime::double2time(range.max);
+    }
     this->setrange(libtime::TRange(abegin, aend));
   }