The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

# SubtractRect function

The SubtractRect function determines the coordinates of a rectangle formed by subtracting one rectangle from another.

## Syntax

```
BOOL SubtractRect(
_Out_  LPRECT lprcDst,
_In_   const RECT *lprcSrc1,
_In_   const RECT *lprcSrc2
);

```

## Parameters

lprcDst [out]

A pointer to a RECT structure that receives the coordinates of the rectangle determined by subtracting the rectangle pointed to by lprcSrc2 from the rectangle pointed to by lprcSrc1.

lprcSrc1 [in]

A pointer to a RECT structure from which the function subtracts the rectangle pointed to by lprcSrc2.

lprcSrc2 [in]

A pointer to a RECT structure that the function subtracts from the rectangle pointed to by lprcSrc1.

## Return value

If the resulting rectangle is empty, the return value is zero.

If the resulting rectangle is not empty, the return value is nonzero.

## Remarks

The function only subtracts the rectangle specified by lprcSrc2 from the rectangle specified by lprcSrc1 when the rectangles intersect completely in either the x- or y-direction. For example, if *lprcSrc1 has the coordinates (10,10,100,100) and *lprcSrc2 has the coordinates (50,50,150,150), the function sets the coordinates of the rectangle pointed to by lprcDst to (10,10,100,100). If *lprcSrc1 has the coordinates (10,10,100,100) and *lprcSrc2 has the coordinates (50,10,150,150), however, the function sets the coordinates of the rectangle pointed to by lprcDst to (10,10,50,100). In other words, the resulting rectangle is the bounding box of the geometric difference.

Because applications can use rectangles for different purposes, the rectangle functions do not use an explicit unit of measure. Instead, all rectangle coordinates and dimensions are given in signed, logical values. The mapping mode and the function in which the rectangle is used determine the units of measure.

## Requirements

 Minimum supported client Windows 2000 Professional [desktop apps only] Windows 2000 Server [desktop apps only] Winuser.h (include Windows.h) User32.lib User32.dll

Rectangles Overview
Rectangle Functions
IntersectRect
RECT
UnionRect