怎样在程序中设置一个 Navigator的速度

类型：整理 | 来自：86CG | 时间：2007-11-29 | 点击：

#include "vg.h"
#include "vgutil.h"

void
setNavigatorOverallSpeed( const int   navIdx,
                          const float speed   ){
char      data[256];
unsigned ctrlptIdx = -1;
int       eventType = -1;
double    value      = -1;
unsigned nbytes     = 0;

      vgSplineNavigator *navigator = vgGetNavigator( navIdx );

    if( navigator == NULL )
        return;

       int render = vgProp( navigator, VGSPLINENAV_RENDER );

       int navstate = vgProp( navigator, VGCOMMON_ENABLED );

       vgProp( navigator, VGSPLINENAV_RENDER, VG_OFF );
    vgProp( navigator, VGCOMMON_ENABLED,   VG_OFF );

       vgUpdate( navigator );

int numMarkers = vgGetProp( navigator,VGNAV_NUM_MARKERS);

       for( int j = 0; j < numMarkers; j++ ){

        vgNavigatorGetMarker( (vgNavigator*)navigator,
                              j,
                             &ctrlptIdx,
                             &eventType,
                             &value,
                             (void**)data,
                             &nbytes );

             if( eventType == VGSPLINENAV_VELOCITY ) {

                     vgNavigatorMarker( (vgNavigator*)navigator,
                              j,
                              ctrlptIdx,
                              VGSPLINENAV_VELOCITY,
                              speed,
                              NULL, 0 );

            }
        }

     vgProp( navigator,VGSPLINENAV_VELOCITY, speed );

        vgMakeSplineNavigator(navigator);

       if( render == VG_ON )
        vgProp( navigator, VGSPLINENAV_RENDER, VG_ON );

        if( navstate == VG_ON )
        vgProp( navigator, VGCOMMON_ENABLED, VG_ON );

}