pick_window(3G)

NAME

intset_pick_window, intinquire_pick_window, inq_pick_window, set_pick_window − define pick window for pick_from_segment and hit_mode

SYNOPSIS

C Syntax:

void intinquire_pick_window(fildes,px_min,py_min,px_max,py_max)
int fildes,*px_min,*py_min,*px_max,*py_max;

void intset_pick_window(fildes,px_min,py_min,px_max,py_max)
int fildes,px_min,py_min,px_max,py_max;

void inq_pick_window(fildes,px_min,py_min,px_max,py_max)
int fildes;
float *px_min,*py_min,*px_max,*py_max;

void set_pick_window(fildes,px_min,py_min,px_max,py_max)
int fildes;
float px_min,py_min,px_max,py_max;

FORTRAN77 Syntax:

subroutine intinquire_pick_window(fildes,px_min,py_min,px_max,py_max)
integer*4 fildes,px_min,py_min,px_max,py_max

subroutine intset_pick_window(fildes,px_min,py_min,px_max,py_max)
integer*4 fildes,px_min,py_min,px_max,py_max

subroutine inq_pick_window(fildes,px_min,py_min,px_max,py_max)
integer*4 fildes
real px_min,py_min,px_max,py_max

subroutine set_pick_window(fildes,px_min,py_min,px_max,py_max)
integer*4 fildes
real px_min,py_min,px_max,py_max

Pascal Syntax:

procedure intinquire_pick_window(fildes:integer; var px_min,py_min,px_max,
py_max:integer);

procedure intset_pick_window(fildes,px_min,py_min,px_max,py_max:integer);

procedure inq_pick_window(fildes:integer;var px_min,py_min,px_max,py_max:real);

procedure set_pick_window(fildes:integer;px_min,py_min,px_max,py_max:real);

DESCRIPTION

Input Parameters

fildes Integer file descriptor returned by gopen when an I/O path to a graphics device is opened.

px_min minimum x limit for pick window in VDC units.

py_min minimum y limit for pick window in VDC units.

px_max maximum x limit for pick window in VDC units.

py_max maximum y limit for pick window in VDC units.

Discussion

Set_pick_window and intset_pick_window set a 2-dimensional rectangular window which together with pick_depth defines a pick aperture.

Inq_pick_window and intinquire_pick_window returns the current set values for the pick window.

The pick window is used for hit testing when the Starbase hit mode is enabled (see hit_mode(3G)). Hit testing is also done by pick_from_segment(3G).

Note that some picking modes (see set_pick_mode(3G) in the Starbase Display List Programmers Manual may cause pick_from_segment(3G) to alter the pick window.

Integer operations are only available when using the INT_XFORM gopen mode. When in INT_XFORM mode, floating point operations are not available for that fildes. Floating point operations are the default, or can be specified with FLOAT_XFORM mode. For a list of integer operations, floating point operations and common operations see the starbase.3g manual page.

ERRORS

1 Graphics device is not initialized for this operation.

DEFAULTS

Float: (px_min,py_min,px_max,py_max)=(0.0,0.0,1.0,1.0)
Integer: (px_min,py_min,px_max,py_max)=(0,0,32767,32767)

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