/*
       Provides the calling sequences for all the basic PetscDraw routines.
*/
#include <petsc/private/drawimpl.h>  /*I "petscdraw.h" I*/

/*@
    PetscDrawGetMouseButton - Returns location of mouse and which button was
    pressed. Waits for button to be pressed.

    Collective over PetscDraw

    Input Parameter:
.   draw - the window to be used

    Output Parameters:
+   button - one of PETSC_BUTTON_LEFT, PETSC_BUTTON_CENTER, PETSC_BUTTON_RIGHT, PETSC_BUTTON_WHEEL_UP, PETSC_BUTTON_WHEEL_DOWN
.   x_user, y_user - user coordinates of location (user may pass in NULL).
-   x_phys, y_phys - window coordinates (user may pass in NULL).

    Notes:
    Only processor 0 actually waits for the button to be pressed.

    Level: intermediate
@*/
PetscErrorCode  PetscDrawGetMouseButton(PetscDraw draw,PetscDrawButton *button,PetscReal *x_user,PetscReal *y_user,PetscReal *x_phys,PetscReal *y_phys)
{
  PetscReal      bcast[4] = {0,0,0,0};
  PetscErrorCode ierr;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1);
  PetscValidPointer(button,2);
  *button = PETSC_BUTTON_NONE;
  if (!draw->ops->getmousebutton) PetscFunctionReturn(0);

  ierr = (*draw->ops->getmousebutton)(draw,button,x_user,y_user,x_phys,y_phys);CHKERRQ(ierr);

  ierr = MPI_Bcast((PetscEnum*)button,1,MPIU_ENUM,0,PetscObjectComm((PetscObject)draw));CHKERRQ(ierr);
  if (x_user) bcast[0] = *x_user;
  if (y_user) bcast[1] = *y_user;
  if (x_phys) bcast[2] = *x_phys;
  if (y_phys) bcast[3] = *y_phys;
  ierr = MPI_Bcast(bcast,4,MPIU_REAL,0,PetscObjectComm((PetscObject)draw));CHKERRQ(ierr);
  if (x_user) *x_user = bcast[0];
  if (y_user) *y_user = bcast[1];
  if (x_phys) *x_phys = bcast[2];
  if (y_phys) *y_phys = bcast[3];
  PetscFunctionReturn(0);
}