View source for Custom Manipulator Controlling X-Plane

{{SDK Example C 200}}
<sample_code t="CustomCommands">// Custom Commands

 //  ***********************************
 //
 //  MANIPULATOR CODE EXAMPLE
 //
 //  This example program illustrates control of X-Plane DataRefs using custom manipulators.
 //  Pumping the flap lever manipulator will lower the flaps a fractional amount.  Raising 
 //  the flap selector manipulator will change the direction of flap movement.  
 //	
 //  For this example to work it is necessary to use AC3D to create two handle animations in  
 //  the aircraft cockpit using the custom datarefs BSUB/Aircraft/FlapPumpPosition and  
 //  BSUB/Aircraft/FlapSelectorPosition for the rotations.  Both handles must be identified  
 //  as axis manipulators with 0 to 1 limits and grabber hand cursor.  
 //
 //  For clarity this code has not been optimized.  
 //
 //  Blue side up,
 //  Bob
 //	
 //  Bob@RogerThat.ca
 //
 //  ***********************************
 
 
 #define XPLM200 = 1;
 
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include "XPLMDataAccess.h"
 #include "XPLMPlugin.h"
 #include "XPLMProcessing.h"
 
 #define MSG_ADD_DATAREF 0x01000000
 
 XPLMDataRef FlapRatioDataRef = NULL;                 // Existing dataref
 
 XPLMDataRef FlapPumpPositionDataRef = NULL;          // Custom dataref 
 XPLMDataRef FlapSelectorPositionDataRef = NULL;      // Custom dataref
 
 
 float	GetFlapPumpPositionDRCB(void* inRefcon);
 void	SetFlapPumpPositionDRCB(void* inRefcon, float outValue);
 
 float	GetFlapSelectorPositionDRCB(void* inRefcon);
 void	SetFlapSelectorPositionDRCB(void* inRefcon, float outValue);
 
 float	FlapPumpPositionFLCB(float elapsedMe, float elapsedSim, int counter, void * refcon);
 
 float FlapPumpPosition = 0;
 float FlapSelectorPosition = 1;          // Flap selector lever is down position at startup
 float FlapSelectorDirectionFlag = 1;     // Flap lever will pump flaps downwards at startup
 
 PLUGIN_API int XPluginStart(
                                            char *          outName,
                                            char *          outSig,
                                            char *          outDesc)
 {
          strcpy(outName, "Flap Manipulator Example");
          strcpy(outSig, "BlueSideUpBob.Flap Manipulator Example");
          strcpy(outDesc, "Manipulating flap selector and flap pump levers raise and lower flaps.");
 
 // CREATE DATAREFS, FIND DATAREFS FOR FLAP LEVER
 
 FlapPumpPositionDataRef = XPLMRegisterDataAccessor(
 
     "BSUB/Aircraft/FlapPumpPosition",
     xplmType_Float,          // The types we support 
     1,                       // Writable 
     NULL, NULL,              // Integer accessors  
     GetFlapPumpPositionDRCB, SetFlapPumpPositionDRCB,     // Float accessors 
     NULL, NULL,              // Doubles accessors 
     NULL, NULL,              // Int array accessors 
     NULL, NULL,              // Float array accessors 
     NULL, NULL,              // Raw data accessors 
     NULL, NULL);             // Refcons not used 
 
 FlapSelectorPositionDataRef = XPLMRegisterDataAccessor(
 
     "BSUB/Aircraft/FlapSelectorPosition",
     xplmType_Float,
     1,
     NULL, NULL,
     GetFlapSelectorPositionDRCB, SetFlapSelectorPositionDRCB,
     NULL, NULL,
     NULL, NULL,
     NULL, NULL,
     NULL, NULL,
     NULL, NULL);
 
 FlapPumpPositionDataRef = XPLMFindDataRef ("BSUB/Aircraft/FlapPumpPosition");
 FlapSelectorPositionDataRef = XPLMFindDataRef ("BSUB/Aircraft/FlapSelectorPosition");
 FlapRatioDataRef = XPLMFindDataRef("sim/cockpit2/controls/flap_ratio");
 
 XPLMSetDataf(FlapPumpPositionDataRef, 0);
 XPLMSetDataf(FlapSelectorPositionDataRef, 0);
 
 XPLMRegisterFlightLoopCallback(FlapPumpPositionFLCB, 0.0, NULL);
 XPLMSetFlightLoopCallbackInterval(FlapPumpPositionFLCB, 0.01, 1, NULL);	
 
 return 1;	
 }
 
 
 PLUGIN_API void	XPluginStop(void)
 {	
     XPLMUnregisterDataAccessor(FlapPumpPositionDataRef);
     XPLMUnregisterDataAccessor(FlapSelectorPositionDataRef);
     XPLMUnregisterFlightLoopCallback(FlapPumpPositionFLCB, NULL);				
 }
 
 
 PLUGIN_API int XPluginEnable(void)
 {
     return 1;
 }
 
 
 PLUGIN_API void XPluginDisable(void)
 {
 
 }
 
 
 
 PLUGIN_API void XPluginReceiveMessage(
                 XPLMPluginID	inFromWho,
                 long			inMessage,
                 void *			inParam)
 {
 }
 
 
 
 float	GetFlapPumpPositionDRCB(void* inRefcon)
 {
     return FlapPumpPosition;
 }
 
 
 void	SetFlapPumpPositionDRCB(void* inRefcon, float inValue)
 {
     FlapPumpPosition = inValue;
 }
 
 
 float	GetFlapSelectorPositionDRCB(void* inRefcon)
 {
     return FlapSelectorPosition;
 }
 
 
 void	SetFlapSelectorPositionDRCB(void* inRefcon, float inValue)
 {
     FlapSelectorPosition = inValue;
 }
 
 
 float  FlapPumpPositionFLCB(
                              float                inElapsedSinceLastCall,    
                              float                inElapsedTimeSinceLastFlightLoop,    
                              int                  inCounter,    
                              void *               inRefcon)
 {	
     float CurrentPumpPosition;
     static float FlapPumpLastPosition = 0; 
     float DeltaPumpPosition; 
     static float FlapDeflection = 0;
     int FlapSelectorDirection;
 
     CurrentPumpPosition = XPLMGetDataf(FlapPumpPositionDataRef);           // Where is handle now? 
     DeltaPumpPosition = CurrentPumpPosition - FlapPumpLastPosition;        // Has handle moved? 
     if (DeltaPumpPosition == 0) {return 0.1;}                              // No.  Check again later.  
 
     FlapPumpLastPosition = CurrentPumpPosition;                            //  SetUp for next cycle.  
 
     if (DeltaPumpPosition < 0) {DeltaPumpPosition = - DeltaPumpPosition;}  // Allows pumping on push and pull strokes.
 
     FlapSelectorPosition = XPLMGetDataf(FlapSelectorPositionDataRef);      // Where is the flap selector handle now? 
     if(FlapSelectorPosition > 0.9) {FlapSelectorDirection = 1;}            // If flap selector is down lower flaps.  
     if(FlapSelectorPosition < 0.1) {FlapSelectorDirection = 0;}            // If flap selector is up raise flaps.
 
     if(FlapSelectorDirection == 1)                                         // Move flaps down 1/10 of flap lever amount
     {
          FlapDeflection = XPLMGetDataf(FlapRatioDataRef) + DeltaPumpPosition * 0.1;
          if (FlapDeflection > 1){FlapDeflection = 1;}                      // Limit flap ratio between 0 and 1.  
          XPLMSetDataf(FlapRatioDataRef, FlapDeflection);                   // Set flaps a proportional amount. 
     } 
 
     if(FlapSelectorDirection == 0)                                         //  Move flaps up
     {
          FlapDeflection = XPLMGetDataf(FlapRatioDataRef) - DeltaPumpPosition * 0.1;	
          if (FlapDeflection < 0){FlapDeflection = 0;}
          XPLMSetDataf(FlapRatioDataRef, FlapDeflection);
     }
 
 return 0.1;
 }