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CentOS 7.0 - man page for tk_getrootcoords (centos section 3)

Tk_GetRootCoords(3)				Tk Library Procedures				  Tk_GetRootCoords(3)

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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 coordi- nates 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 Tk Tk_GetRootCoords(3)


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