Draw Terrain Object
From X-Plane SDK
- Download Draw Terrain Object as project for X-Code 3.2 or newer, 32 and 64-bit Intel
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// ************************************************* // DRAW TERRAIN OBJECT // // This example illustrates drawing a terrain object that moves in relation to the aircraft. In this case // the object is located directly forward of the cockpit. // // For this example to work it is necessary to create an object in the aircraft folder. Example: // "Aircraft/General Aviation/FP404/objects/TestObject.obj". See line 143. // // To turn the object on and off it is nececssary to place generic triggers on the panel of your aircraft keyed // to the command: BSUB/ShowObject/TestObject and BSUB/HideObject/TestObject. // // Blue Side Up, // Bob. // // Bob@RogerThat.ca // // ************************************************* #include "XPLMPlugin.h" #include "XPLMDisplay.h" #include "XPLMGraphics.h" #include "XPLMProcessing.h" #include "XPLMDataAccess.h" #include "XPLMMenus.h" #include "XPLMUtilities.h" #include "XPWidgets.h" #include "XPStandardWidgets.h" #include "XPLMScenery.h" #include <string.h> #include <stdio.h> #include <stdlib.h> #include <math.h> char gBob_debstr[128]; XPLMDataRef gHeadingDataRef = NULL; XPLMDataRef gPitchDataRef = NULL; XPLMDataRef gRollDataRef = NULL; XPLMDataRef CofG_refx = NULL; XPLMDataRef CofG_refy = NULL; XPLMDataRef CofG_refz = NULL; XPLMCommandRef ShowObjectCommand = NULL; XPLMCommandRef HideObjectCommand = NULL; int ShowObjectCommandHandler(XPLMCommandRef inCommand, XPLMCommandPhase inPhase, void * inRefcon); int HideObjectCommandHandler(XPLMCommandRef inCommand, XPLMCommandPhase inPhase, void * inRefcon); // Used by the Draw Objects test XPLMObjectRef gTestObject=NULL; const float Pi = 3.14159265358979; const float RadToDeg = 180.0 / Pi; const float DegToRad = 1.0 / RadToDeg; // Prototype for Draw Object tests int DrawTestObject(XPLMDrawingPhase inPhase, int inIsBefore, void * inRefcon); PLUGIN_API int XPluginStart( char * outName, char * outSig, char * outDesc) { // Plugin Info strcpy(outName, "DrawTerrainObject"); strcpy(outSig, "BlueSideUpBob.Example.DrawTerrainObject"); strcpy(outDesc, "Draw, hide, and show a terrain object that moves along with aircraft."); // Create the test commands; these will Show/Hide the test object. ShowObjectCommand = XPLMCreateCommand("BSUB/ShowObject/TestObject", "Show TestObject"); HideObjectCommand = XPLMCreateCommand("BSUB/HideObject/TestObject", "Hide TestObject"); // Register our custom commands XPLMRegisterCommandHandler(ShowObjectCommand, // in Command name ShowObjectCommandHandler, // in Handler 1, // Receive input before plugin windows. (void *) 0); // inRefcon. XPLMRegisterCommandHandler(HideObjectCommand, // in Command name HideObjectCommandHandler, // in Handler 1, // Receive input before plugin windows. (void *) 0); // inRefcon. // Get the aicraft position CofG_refx = XPLMFindDataRef("sim/flightmodel/position/local_x"); CofG_refy = XPLMFindDataRef("sim/flightmodel/position/local_y"); CofG_refz = XPLMFindDataRef("sim/flightmodel/position/local_z"); gHeadingDataRef = XPLMFindDataRef ("sim/flightmodel/position/psi"); gRollDataRef = XPLMFindDataRef ("sim/flightmodel/position/phi"); gPitchDataRef = XPLMFindDataRef ("sim/flightmodel/position/theta"); // This used to draw the test object. XPLMRegisterDrawCallback( DrawTestObject, xplm_Phase_Objects, 0, 0 ); return 1; } PLUGIN_API void XPluginStop(void) { XPLMUnregisterCommandHandler(ShowObjectCommand, ShowObjectCommandHandler, 0, 0); XPLMUnregisterCommandHandler(HideObjectCommand, HideObjectCommandHandler, 0, 0); } PLUGIN_API void XPluginDisable(void) { } PLUGIN_API int XPluginEnable(void) { return 1; } PLUGIN_API void XPluginReceiveMessage( XPLMPluginID inFromWho, long inMessage, void * inParam) { } int ShowObjectCommandHandler( XPLMCommandRef inCommand, XPLMCommandPhase inPhase, void * inRefcon) { if (inPhase == 0) { gTestObject = XPLMLoadObject("Aircraft/General Aviation/FP404Master/objects/TestObject.obj"); if (gTestObject == NULL) { sprintf(gBob_debstr,"Test Object not found, inPhase %d \n", inPhase); XPLMDebugString(gBob_debstr); } } // Return 1 to pass the command to plugin windows and X-Plane. // Returning 0 disables further processing by X-Plane. // In this case we might return 0 or 1 because X-Plane does not duplicate our command. return 0; } int HideObjectCommandHandler( XPLMCommandRef inCommand, XPLMCommandPhase inPhase, void * inRefcon) { if (inPhase == 0) { // Unload the imported object XPLMUnloadObject(gTestObject); } return 0; } // Function for Draw Object tests int DrawTestObject( XPLMDrawingPhase inPhase, int inIsBefore, void * inRefcon) { static float LongitudinalOffset = -20.0; static float VerticalOffset = 2.0; float AircraftHeading; // Draw the imported object. Only do this if we have everything we need. if (gTestObject && CofG_refx && CofG_refy && CofG_refz) //Locate the test object by its heading. { AircraftHeading = XPLMGetDataf(gHeadingDataRef); if (AircraftHeading <= 90) { XPLMDrawInfo_t locations[1] = { 0 }; locations[0].structSize = sizeof(XPLMDrawInfo_t); locations[0].x = XPLMGetDatad(CofG_refx) - LongitudinalOffset * sin (AircraftHeading * DegToRad); locations[0].y = XPLMGetDatad(CofG_refy) + VerticalOffset; locations[0].z = XPLMGetDatad(CofG_refz) + LongitudinalOffset * cos (AircraftHeading * DegToRad); locations[0].pitch = XPLMGetDataf(gPitchDataRef); locations[0].heading = AircraftHeading; locations[0].roll = XPLMGetDataf(gRollDataRef); // Draw the object XPLMDrawObjects(gTestObject, 1, locations, 0, 0); return 1; } if (AircraftHeading <= 180) { XPLMDrawInfo_t locations[1] = { 0 }; locations[0].structSize = sizeof(XPLMDrawInfo_t); locations[0].x = XPLMGetDatad(CofG_refx) - LongitudinalOffset * sin ((180 - AircraftHeading) * DegToRad); locations[0].y = XPLMGetDatad(CofG_refy) + VerticalOffset; locations[0].z = XPLMGetDatad(CofG_refz) - LongitudinalOffset * cos ((180 - AircraftHeading) * DegToRad); locations[0].pitch = XPLMGetDataf(gPitchDataRef); locations[0].heading = AircraftHeading; locations[0].roll = XPLMGetDataf(gRollDataRef); // Draw the object XPLMDrawObjects(gTestObject, 1, locations, 0, 0); return 1; } if (AircraftHeading <= 270) { XPLMDrawInfo_t locations[1] = { 0 }; locations[0].structSize = sizeof(XPLMDrawInfo_t); locations[0].x = XPLMGetDatad(CofG_refx) + LongitudinalOffset * cos ((270 - AircraftHeading) * DegToRad); locations[0].y = XPLMGetDatad(CofG_refy) + VerticalOffset; locations[0].z = XPLMGetDatad(CofG_refz) - LongitudinalOffset * sin ((270 - AircraftHeading) * DegToRad); locations[0].pitch = XPLMGetDataf(gPitchDataRef); locations[0].heading = AircraftHeading; locations[0].roll = XPLMGetDataf(gRollDataRef); // Draw the object XPLMDrawObjects(gTestObject, 1, locations, 0, 0); return 1; } if (AircraftHeading <= 360) { XPLMDrawInfo_t locations[1] = { 0 }; locations[0].structSize = sizeof(XPLMDrawInfo_t); locations[0].x = XPLMGetDatad(CofG_refx) + LongitudinalOffset * sin ((360 - AircraftHeading) * DegToRad); locations[0].y = XPLMGetDatad(CofG_refy) + VerticalOffset; locations[0].z = XPLMGetDatad(CofG_refz) + LongitudinalOffset * cos ((360 - AircraftHeading) * DegToRad); locations[0].pitch = XPLMGetDataf(gPitchDataRef); locations[0].heading = AircraftHeading; locations[0].roll = XPLMGetDataf(gRollDataRef); // Draw the object XPLMDrawObjects(gTestObject, 1, locations, 0, 0); return 1; } } return 1; }
