Actual source code: dmouse.c


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

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

  8:     Collective

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

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

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

 23:     Level: intermediate

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

 31:   PetscFunctionBegin;
 34:   *button = PETSC_BUTTON_NONE;
 35:   if (!draw->ops->getmousebutton) PetscFunctionReturn(PETSC_SUCCESS);

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

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