Added small tutorial on custom properties

2019-03-12 08:00:17 +01:00
parent c7107e1f97
commit c2792234d1
9 changed files with 245 additions and 162 deletions
--- a/Doc/Tutorial/10-persistence/int2roman.cc
+++ b/Doc/Tutorial/10-persistence/int2roman.cc
@@ -0,0 +1,42 @@
+#include <OpenMesh/Core/System/config.hh>
+#if defined(OM_CC_MIPS)
+#  include <assert.h>
+#else
+#  include <cassert>
+#endif
+#include "int2roman.hh"
+
+
+std::string int2roman( size_t decimal, size_t length )
+{
+  assert( decimal > 0 && decimal < 1000 );
+
+  const size_t nrows = 4;
+  const size_t ncols = 4;
+
+  static size_t table_arabs[ nrows ][ ncols ] = { { 1000, 1000, 1000, 1000 },
+                                                  {  900,  500,  400,  100 },
+                                                  {   90,   50,   40,   10 },
+                                                  {    9,    5,    4,    1 } };
+
+  static char *table_romans[ nrows ][ ncols ] = { {  "M",  "M",  "M", "M" },
+                                                  { "CM",  "D", "CD", "C" },
+                                                  { "XC",  "L", "XL", "X" },
+                                                  { "IX",  "V", "IV", "I" } };
+
+  size_t power;	// power of ten
+  size_t index;  // Indexes thru values to subtract
+  
+  std::string roman = "";
+  roman.reserve(length);
+
+  for ( power = 0; power < nrows; power++ )
+    for ( index = 0; index < ncols; index++ )
+	while ( decimal >= table_arabs[ power ][ index ] ) 
+        {
+	   roman   += table_romans[ power ][ index ];
+	   decimal -= table_arabs[ power ][ index ];
+	}
+
+  return roman;
+}