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GetRootCrd.3
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1994-09-20
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Tk_GetRootCoords(3) Tk Library Procedures
_________________________________________________________________
NAME
Tk_GetRootCoords - Compute root-window coordinates of window
SYNOPSIS
#include <tk.h>
Tk_GetRootCoords(_t_k_w_i_n, _x_P_t_r, _y_P_t_r)
ARGUMENTS
Tk_Window _t_k_w_i_n (in) Token for window.
int *_x_P_t_r (out) Pointer to location in which
to store root-window x-
coordinate corresponding to
left edge of _t_k_w_i_n's border.
int *_y_P_t_r (out) Pointer to location in which
to store root-window y-
coordinate corresponding to
top edge of _t_k_w_i_n's border.
_________________________________________________________________
DESCRIPTION
This procedure scans through the structural information
maintained by Tk to compute the root-window coordinates
corresponding to the upper-left corner of _t_k_w_i_n's border.
If _t_k_w_i_n has no border, then Tk_GetRootCoords returns the
root-window coordinates corresponding to location (0,0) in
_t_k_w_i_n. Tk_GetRootCoords is relatively efficient, since it
doesn't have to communicate with the X server.
KEYWORDS
coordinates, root window
Tk 1