io/viewers/viewer3D-10-interaction.cpp

Simple selection of a surfel (with shift + left click) with the QGLViewer proposed by DGtal (Viewer3D). You may associates names (i.e. integers) to surfels or to group of surfels. You may associate reactions or callback functions to named graphical objects (surfels in DGtal 0.9).

The red surfel is given the name 10001, the green 10002 and the blue

1. A specific reaction is associated with surfel 10001, while a common reaction is associated with surfels 10002 and 10003. The reactions simply display the clicked surfel.

See also

Limited interaction when using selection with QGLViewer Viewer3D stream mechanism

$ ./examples/io/viewers/viewer3D-10-interaction

Example of viewer3D interaction with the selection of surfels.

#include <iostream>

#include "DGtal/base/Common.h"
#include "DGtal/helpers/StdDefs.h"
#include "DGtal/io/viewers/Viewer3D.h"


using namespace std;
using namespace DGtal;
using namespace Z3i;

typedef Viewer3D<Space,KSpace> MyViewer;
typedef MyViewer::SelectCallbackFct SelectCallbackFct;
typedef KSpace::SCell SCell;

struct BigDataCells
{
  KSpace K;
  std::map< DGtal::int32_t, Z3i::SCell > cells;
};

struct BigDataVoxels
{
  std::map< DGtal::int32_t, Z3i::Point > voxels;
};

int reaction1( void* viewer, DGtal::int32_t name, void* data )
{
  BigDataCells* bg = (BigDataCells*) data;
  stringstream ssMessage;
  ssMessage << "Reaction1 with name " << name << " cell " << bg->K.sKCoords( bg->cells[ name ] )  ;
  ((MyViewer *) viewer)->displayMessage(QString(ssMessage.str().c_str()), 100000);
  trace.info() <<  ssMessage.str() << std::endl;
  return 0;
}
int reaction23( void* viewer, DGtal::int32_t name, void* data )
{
  BigDataCells* bg = (BigDataCells*) data;
  stringstream ssMessage;
  ssMessage <<  "Reaction23 with name " << name << " cell " << bg->K.sKCoords( bg->cells[ name ] );
  ((MyViewer *) viewer)->displayMessage(QString(ssMessage.str().c_str()), 100000);
  trace.info() << ssMessage.str() << std::endl;
  return 0;
}
int reaction4( void* viewer, DGtal::int32_t name, void* data )
{
  BigDataVoxels* bg = (BigDataVoxels*) data;
  stringstream ssMessage;
  ssMessage <<  "Reaction4 with name " << name << " Voxel " << bg->voxels[name] ;
  ((MyViewer *) viewer)->displayMessage(QString(ssMessage.str().c_str()), 100000);
  trace.info() << ssMessage.str() << std::endl;
  return 0;
}
// Standard services - public :

int main( int argc, char** argv )
{
  QApplication application(argc,argv);
  BigDataCells data;
  BigDataVoxels dataV;
  Point p1( 0, 0, 0 );
  Point p2( 5, 5 ,5 );
  Point p3( 2, 3, 4 );
  KSpace & K = data.K;
  K.init( p1, p2, true );
  Point v1 = Z3i::Point(10, 10,10);
  Point v2 = Z3i::Point(9, 9, 9);
  Point v3 = Z3i::Point(11, 11,11);
  
  dataV.voxels[4001] = v1;
  dataV.voxels[4002] = v2;
  dataV.voxels[4003] = v3;
  
  
  MyViewer viewer( K );
  viewer.show();
  viewer.displayMessage(QString("You can use [shift + click right] on surfels or voxel to interact ..."), 100000);
  Z3i::SCell surfel1 = K.sCell( Point( 1, 1, 2 ), KSpace::POS );
  Z3i::SCell surfel2 = K.sCell( Point( 3, 3, 4 ), KSpace::NEG );
  Z3i::SCell surfel3 = K.sCell( Point( 5, 6, 5 ), KSpace::POS );
  data.cells[ 10001 ] = surfel1;
  data.cells[ 10002 ] = surfel2;
  data.cells[ 10003 ] = surfel3;
  viewer << SetMode3D( surfel1.className(), "Basic" );
  viewer << SetName3D( 10001 ) << CustomColors3D( Color::Red, Color::Red ) << surfel1;
  viewer << SetName3D( 10002 ) << CustomColors3D( Color::Green, Color::Green ) << surfel2;
  viewer << SetName3D( 10003 ) << CustomColors3D( Color::Blue, Color::Blue ) << surfel3;
  viewer << SetSelectCallback3D( reaction1,  &data, 10001, 10001 );
  viewer << SetSelectCallback3D( reaction23, &data, 10002, 10003 );
 
  // example by using voxel interaction:
  viewer << SetName3D( 4001 ) << v1;
  viewer << SetName3D( 4002 ) << v2;
  viewer << SetName3D( 4003 ) << v3;
  viewer << SetSelectCallback3D( reaction4, &dataV, 4001,4003 );
  viewer<< MyViewer::updateDisplay;
  return application.exec();
}
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