Actual source code: dmouse.c


  2: /*
  3:        Provides the calling sequences for all the basic PetscDraw routines.
  4: */
  5: #include <petsc/private/drawimpl.h>

  7: /*@
  8:     PetscDrawGetMouseButton - Returns location of mouse and which button was
  9:     pressed. Waits for button to be pressed.

 11:     Collective

 13:     Input Parameter:
 14: .   draw - the window to be used

 16:     Output Parameters:
 17: +   button - one of `PETSC_BUTTON_LEFT`, `PETSC_BUTTON_CENTER`, `PETSC_BUTTON_RIGHT`, `PETSC_BUTTON_WHEEL_UP`, `PETSC_BUTTON_WHEEL_DOWN`
 18: .   x_user - horizontal user coordinate of location (user may pass in NULL).
 19: .   y_user - vertical user coordinate of location (user may pass in NULL).
 20: .   x_phys - horizontal window coordinate (user may pass in NULL).
 21: -   y_phys - vertical window coordinate (user may pass in NULL).

 23:     Note:
 24:     Only processor 0 actually waits for the button to be pressed.

 26:     Level: intermediate

 28: .seealso: `PetscDraw`, `PetscDrawButton`
 29: @*/
 30: PetscErrorCode PetscDrawGetMouseButton(PetscDraw draw, PetscDrawButton *button, PetscReal *x_user, PetscReal *y_user, PetscReal *x_phys, PetscReal *y_phys)
 31: {
 32:   PetscReal bcast[4] = {0, 0, 0, 0};

 36:   *button = PETSC_BUTTON_NONE;
 37:   if (!draw->ops->getmousebutton) return 0;

 39:   PetscUseTypeMethod(draw, getmousebutton, button, x_user, y_user, x_phys, y_phys);

 41:   MPI_Bcast((PetscEnum *)button, 1, MPIU_ENUM, 0, PetscObjectComm((PetscObject)draw));
 42:   if (x_user) bcast[0] = *x_user;
 43:   if (y_user) bcast[1] = *y_user;
 44:   if (x_phys) bcast[2] = *x_phys;
 45:   if (y_phys) bcast[3] = *y_phys;
 46:   MPI_Bcast(bcast, 4, MPIU_REAL, 0, PetscObjectComm((PetscObject)draw));
 47:   if (x_user) *x_user = bcast[0];
 48:   if (y_user) *y_user = bcast[1];
 49:   if (x_phys) *x_phys = bcast[2];
 50:   if (y_phys) *y_phys = bcast[3];
 51:   return 0;
 52: }