## Tcl8.6.15/Tk8.6.15 Documentation > Tk C API, version 8.6.15 > GetRootCrd

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### NAME

Tk_GetRootCoords — Compute root-window coordinates of window

### SYNOPSIS

#include <tk.h>
Tk_GetRootCoords(tkwin, xPtr, yPtr)

### ARGUMENTS

Tk_Window tkwin (in)
  Token for window.

int *xPtr (out)
  Pointer to location in which to store root-window x-coordinate corresponding to left edge of tkwin's border.

int *yPtr (out)
  Pointer to location in which to store root-window y-coordinate corresponding to top edge of tkwin'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 tkwin's border. If tkwin has no border, then Tk_GetRootCoords returns the root-window coordinates corresponding to location (0,0) in tkwin. Tk_GetRootCoords is relatively efficient, since it does not have to communicate with the X server.

### KEYWORDS

coordinates, root window
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