graph: add adjust_height per request (resolves #388)

this command adjusts height (z-component) of all the graph nodes on map with specified height offset, negative height offset can be passed as parameter as well.

inc/control.h

@@ -124,6 +124,7 @@ private:
    int cmdNodeIterateCamp ();
    int cmdNodeShowStats ();
    int cmdNodeFileInfo ();
+   int cmdAdjustHeight ();
 
 private:
    int menuMain (int item);
@@ -187,6 +188,13 @@ public:
       return m_args[arg].int_ ();
    }
 
+   float floatValue (size_t arg) const {
+      if (!hasArg (arg)) {
+         return 0.0f;
+      }
+      return m_args[arg].float_ ();
+   }
+
    StringRef strValue (size_t arg) {
       if (!hasArg (arg)) {
          return "";

src/control.cpp

@@ -333,6 +333,7 @@ int BotControl::cmdNode () {
       addGraphCmd ("upload", "upload", "Uploads created graph to graph database.", &BotControl::cmdNodeUpload);
       addGraphCmd ("stats", "stats [noarguments]", "Shows the stats about node types on the map.", &BotControl::cmdNodeShowStats);
       addGraphCmd ("fileinfo", "fileinfo [noarguments]", "Shows basic information about graph file.", &BotControl::cmdNodeFileInfo);
+      addGraphCmd ("adjust_height", "adjust_height [height offset]", "Modifies all the graph nodes height (z-component) with specified offset.", &BotControl::cmdAdjustHeight);
 
       // add path commands
       addGraphCmd ("path_create", "path_create [noarguments]", "Opens and displays path creation menu.", &BotControl::cmdNodePathCreate);
@@ -867,6 +868,21 @@ int BotControl::cmdNodeFileInfo () {
    return BotCommandResult::Handled;
 }
 
+int BotControl::cmdAdjustHeight() {
+   enum args { graph_cmd = 1, cmd, offset };
+
+   if (!hasArg (offset)) {
+      return BotCommandResult::BadFormat;
+   }
+   auto heightOffset = floatValue (offset);
+
+   // adjust the height for all the nodes (negative values possible)
+   for (int i = 0; i < graph.length (); ++i) {
+      graph[i].origin.z += heightOffset;
+   }
+   return BotCommandResult::Handled;
+}
+
 int BotControl::menuMain (int item) {
    closeMenu (); // reset menu display