Merge pull request #688 from OpenWaterAnalytics/681-request-additional-api-function-for-getting-finer-grained-time-step-information

adds an API function to get information about upcoming events

ReleaseNotes2_3.md

@@ -25,6 +25,7 @@ This document describes the changes and updates that have been made in version 2
  - A possible loss of network connectivity when evaluating a Pressure Sustaining Valve was prevented.
  - Having the implied loss coefficient for an active Flow Control Valve be less than its fully opened value was prevented.
  - A new type of valve, a Positional Control Valve (PCV), was added that uses a valve characteristic curve to relate its loss coefficient to its fraction open setting. 
- 
+ - A new set of functions have been added to get information about upcoming time step events. Users will now see what type of event is going to cause the end of a time step to occur. See ENtimetonextevent and EN_timetonextevent.
+ - A new set of functions have been added to allow users to set a reporting callback function. The user-supplied function will recieve all output normally directed to the report file.
  
 

include/epanet2.bas

@@ -253,6 +253,12 @@ Public Const EN_R_IS_OPEN = 1     ' Rule status types
 Public Const EN_R_IS_CLOSED = 2
 Public Const EN_R_IS_ACTIVE = 3
 
+Public Const EN_STEP_REPORT = 0   ' Types of events that can cause a timestep to end
+Public Const EN_STEP_HYD = 1
+Public Const EN_STEP_WQ = 2
+Public Const EN_STEP_TANKEVENT = 3
+Public Const EN_STEP_CONTROLEVENT = 4
+
 Public Const EN_MISSING As Double = -1.0E10
 
 'These are the external functions that comprise the DLL
@@ -302,6 +308,7 @@ Public Const EN_MISSING As Double = -1.0E10
  Declare Function ENgeterror Lib "epanet2.dll" (ByVal errcode As Long, ByVal errmsg As String, ByVal maxLen As Long) As Long
  Declare Function ENgetstatistic Lib "epanet2.dll" (ByVal type_ As Long, ByRef value As Single) As Long
  Declare Function ENgetresultindex Lib "epanet2.dll" (ByVal type_ As Long, ByVal index As Long, ByRef value As Long) As Long
+ Declare Function ENtimetonextevent Lib "epanet2.dll" (eventType As Long, duration As Long, elementIndex As Long) As Long
 
 'Analysis Options Functions
  Declare Function ENgetoption Lib "epanet2.dll" (ByVal option_ As Long, value As Single) As Long

include/epanet2.def

@@ -131,3 +131,4 @@ EXPORTS
     ENstepQ                       = _ENstepQ@4
     ENusehydfile                  = _ENusehydfile@4
     ENwriteline                   = _ENwriteline@4
+    ENtimetonextevent             = _ENtimetonextevent@12

include/epanet2.h

@@ -159,6 +159,8 @@ extern "C" {
 
   int  DLLEXPORT ENgetresultindex(int type, int index, int *value);
 
+  int  DLLEXPORT ENtimetonextevent(int *eventType, long *duration, int *elementIndex);
+
   int DLLEXPORT ENsetreportcallback(void (*callback)(void *userData, void *EN_projectHandle, char*));
   int DLLEXPORT ENsetreportcallbackuserdata(void *userData);
 

include/epanet2_2.h

@@ -650,6 +650,16 @@ typedef struct Project *EN_Project;
   */
   int  DLLEXPORT EN_getstatistic(EN_Project ph, int type, double* out_value);
 
+
+  /**
+  @brief Get information about upcoming time step events, and what causes them.
+  @param ph an EPANET project handle.
+  @param[out] eventType the type of event that will occur (see @ref EN_TimestepEvent).
+  @param[out] duration the amount of time in the future this event will occur
+  @param[out] elementIndex the index of the element causing the event.
+  **/
+  int DLLEXPORT EN_timetonextevent(EN_Project ph, int *eventType, long *duration, int *elementIndex);
+
   /**
   @brief Retrieves the order in which a node or link appears in an @ref OutFile "output file".
   @param ph an EPANET project handle.

include/epanet2_enums.h

@@ -126,6 +126,18 @@ typedef enum {
   EN_NEXTEVENTTANK = 15  //!< Index of tank with shortest time to become empty or full (read only)
 } EN_TimeParameter;
 
+
+/**
+These are the types of events that can cause a timestep to end.
+**/
+typedef enum {
+  EN_STEP_REPORT       = 0,
+  EN_STEP_HYD          = 1,
+  EN_STEP_WQ           = 2,
+  EN_STEP_TANKEVENT    = 3,
+  EN_STEP_CONTROLEVENT = 4
+} EN_TimestepEvent;
+
 /// Analysis convergence statistics
 /**
 These statistics report the convergence criteria for the most current hydraulic analysis

src/epanet.c

@@ -1623,6 +1623,42 @@ int DLLEXPORT EN_settimeparam(EN_Project p, int param, long value)
     return 0;
 }
 
+
+/// get the time to next event, and give a reason for the time step truncation
+int  DLLEXPORT EN_timetonextevent(EN_Project p, int *eventType, long *duration, int *elementIndex)
+{
+  Times  *time = &p->times;
+  long hydStep, tankStep, controlStep;
+  int iTank, iControl;
+  
+  hydStep = time->Hstep;
+  tankStep = hydStep;
+  controlStep = hydStep;
+
+  iTank = tanktimestep(p, &tankStep);
+  iControl = controltimestep(p, &controlStep);
+
+  // return the lesser of the three step lengths
+  if (controlStep < tankStep) {
+    *eventType = (int)EN_STEP_CONTROLEVENT;
+    *duration = controlStep;
+    *elementIndex = iControl;
+  }
+  else if (tankStep < hydStep) {
+    *eventType = (int)EN_STEP_TANKEVENT;
+    *duration = tankStep;
+    *elementIndex = iTank;
+  }
+  else {
+    *eventType = (int)EN_STEP_HYD;
+    *duration = hydStep;
+    *elementIndex = 0;
+  }
+
+  return 0;
+}
+
+
 int DLLEXPORT EN_getqualinfo(EN_Project p, int *qualType, char *chemName,
                              char *chemUnits, int *traceNode)
 /*----------------------------------------------------------------

src/epanet2.c

@@ -242,6 +242,10 @@ int DLLEXPORT ENgetresultindex(int type, int index, int *value)
     return EN_getresultindex(_defaultProject, type, index, value);
 }
 
+int  DLLEXPORT ENtimetonextevent(int *eventType, long *duration, int *elementIndex)
+{
+    return EN_timetonextevent(_defaultProject, eventType, duration, elementIndex);
+}
 
 /********************************************************************
 

src/funcs.h

@@ -155,6 +155,7 @@ void    closehyd(Project *);
 void    setlinkstatus(Project *, int, char, StatusType *, double *);
 void    setlinksetting(Project *, int, double, StatusType *, double *);
 int     tanktimestep(Project *, long *);
+int     controltimestep(Project *, long *);
 void    getenergy(Project *, int, double *, double *);
 double  tankvolume(Project *, int, double);
 double  tankgrade(Project *, int, double);

src/hydraul.c

@@ -34,7 +34,6 @@ void    initlinkflow(Project *, int, char, double);
 void    demands(Project *);
 int     controls(Project *);
 long    timestep(Project *);
-void    controltimestep(Project *, long *);
 void    ruletimestep(Project *, long *);
 void    addenergy(Project *, long);
 void    tanklevels(Project *, long);
@@ -706,7 +705,7 @@ int  tanktimestep(Project *pr, long *tstep)
 }
 
 
-void  controltimestep(Project *pr, long *tstep)
+int  controltimestep(Project *pr, long *tstep)
 /*
 **------------------------------------------------------------------
 **  Input:   *tstep = current time step
@@ -719,7 +718,7 @@ void  controltimestep(Project *pr, long *tstep)
     Network *net = &pr->network;
     Hydraul *hyd = &pr->hydraul;
 
-    int    i, j, k, n;
+    int    i, j, k, n, controlIndex;
     double h, q, v;
     long   t, t1, t2;
     Slink  *link;
@@ -776,9 +775,14 @@ void  controltimestep(Project *pr, long *tstep)
             k = control->Link;
             link = &net->Link[k];
             if ( (link->Type > PIPE && hyd->LinkSetting[k] != control->Setting)
-            ||   (hyd->LinkStatus[k] != control->Status) ) *tstep = t;
+              || (hyd->LinkStatus[k] != control->Status) )
+            {
+              *tstep = t;
+              controlIndex = i;
+            }
         }
     }
+    return controlIndex;
 }
 
 
@@ -1133,4 +1137,3 @@ void resetpumpflow(Project *pr, int i)
     if (pump->Ptype == CONST_HP)
         pr->hydraul.LinkFlow[i] = pump->Q0;
 }
-

src/report.c

@@ -885,14 +885,14 @@ void writeline(Project *pr, char *s)
 **--------------------------------------------------------------
 */
 {
+    Report *rpt = &pr->report;
+    
     if (pr->report.reportCallback != NULL)
     {
         pr->report.reportCallback(pr->report.reportCallbackUserData, pr, s);
         return;
     }
 
-    Report *rpt = &pr->report;
-
     if (rpt->RptFile == NULL) return;
     if (rpt->Rptflag)
     {