## Tcl9.0.3/Tk9.0.3 Documentation > Tk C API > GetRootCrd

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### NAME

Tk_GetRootCoords — 窓の根本窓座標を計算する　 Compute root-window coordinates of window

### SYNOPSIS

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

### 引数 ARGUMENTS

Tk_Window tkwin (入力in)
  窓の字句 Token for window.

int *xPtr (出力out)
  tkwin の境界の左縁に相当する根本座標のx-座標を保存すべき場所への指示子｡ Pointer to location in which to store root-window x-coordinate corresponding to left edge of tkwin's border.

int *yPtr (出力out)
  tkwin の境界の上縁に相当する根本座標のx-座標を保存すべき場所への指示子｡　 Pointer to location in which to store root-window y-coordinate corresponding to top edge of tkwin's border.

### 説明 DESCRIPTION

この手続函数は tkwin の縁の左上隅に相当する根本窓の座標を計算する為に Tk により運営されている構造的情報を走査する｡もし tkwin が縁を有さない場合､ Tk_GetRootCoords は tkwin 内の位置(0,0)に相当する根本窓座標を返す｡ Tk_GetRootCoords は X 中央集中処理装置と通信をする必要がない為､比較的効率的である｡ 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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