#include <GL/glui.h>



extern void setCamera();

extern void reset();

extern bool  showGrid;

extern float pixPerMeter;



GLUI *ui = NULL;


GLUI_Spinner *scaleSpinner;



//

// These two variables are needed for compatibility.

// GLUI uses int's, while we use bool's.

//


int localShowGrid;



enum {SHOW_GRID, SCALE, RESET, QUIT};



///////////////////////////////////////////////////////////

//

// Tell the UI's variables that the corresponding

// variables in the program have changed.

//

///////////////////////////////////////////////////////////





void syncVars() {

  if (ui != NULL) {


	scaleSpinner->set_float_val(pixPerMeter);

  }

}



///////////////////////////////////////////////////////////

//

// This is called when the user interacts with a

// widget on the user interface (UI).

// The ID parameter identifies which widget was affected.

//

///////////////////////////////////////////////////////////



void handleGLUIEvent( int ID ) {

  switch (ID) {

  case SHOW_GRID:

	showGrid = (localShowGrid != 0);

    glutPostRedisplay();

	break;


  case SCALE:

	setCamera();

    glutPostRedisplay();

	break;



  case RESET:

	reset();

	setCamera();

	syncVars();

	glutPostRedisplay();

	break;



  case QUIT:

	exit(0);



  }

}



///////////////////////////////////////////////////////////

//

// Set up the graphical user interface (UI),

// Which includes two checkboxes, two spinners,

// and two buttons.

//

///////////////////////////////////////////////////////////



void setupUI (int mainWindowID) {


  localShowGrid    = showGrid;



  ui = GLUI_Master.create_glui( "Window Controls", 0 );



  ui->add_checkbox("Show Grid",

                   &localShowGrid, SHOW_GRID,

                   handleGLUIEvent);


  scaleSpinner = ui->add_spinner("Pixels/meter",

                    GLUI_SPINNER_FLOAT, &pixPerMeter,

				    SCALE, handleGLUIEvent );



  ui->add_button("Reset", RESET, handleGLUIEvent);

  ui->add_button("Quit", QUIT, handleGLUIEvent);



  ui->set_main_gfx_window( mainWindowID );

  GLUI_Master.set_glutIdleFunc( NULL );



  glutMainLoop();

}