Actual source code: dmouse.c

      1: #include <petsc/private/drawimpl.h>

      3: /*@
      4:   PetscDrawGetMouseButton - Returns location of mouse and which button was
      5:   pressed. Waits for button to be pressed.

      7:   Collective

      9:   Input Parameter:
     10: . draw - the window to be used

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

     19:   Note:
     20:   Only processor 0 actually waits for the button to be pressed.

     22:   Level: intermediate

     24: .seealso: `PetscDraw`, `PetscDrawButton`
     25: @*/
     26: PetscErrorCode PetscDrawGetMouseButton(PetscDraw draw, PetscDrawButton *button, PetscReal *x_user, PetscReal *y_user, PetscReal *x_phys, PetscReal *y_phys)
     27: {
     28:   PetscReal bcast[4] = {0, 0, 0, 0};

     30:   PetscFunctionBegin;
     32:   PetscAssertPointer(button, 2);
     33:   *button = PETSC_BUTTON_NONE;
     34:   if (!draw->ops->getmousebutton) PetscFunctionReturn(PETSC_SUCCESS);

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

     38:   PetscCallMPI(MPI_Bcast((PetscEnum *)button, 1, MPIU_ENUM, 0, PetscObjectComm((PetscObject)draw)));
     39:   if (x_user) bcast[0] = *x_user;
     40:   if (y_user) bcast[1] = *y_user;
     41:   if (x_phys) bcast[2] = *x_phys;
     42:   if (y_phys) bcast[3] = *y_phys;
     43:   PetscCallMPI(MPI_Bcast(bcast, 4, MPIU_REAL, 0, PetscObjectComm((PetscObject)draw)));
     44:   if (x_user) *x_user = bcast[0];
     45:   if (y_user) *y_user = bcast[1];
     46:   if (x_phys) *x_phys = bcast[2];
     47:   if (y_phys) *y_phys = bcast[3];
     48:   PetscFunctionReturn(PETSC_SUCCESS);
     49: }