关于SetRect

CRect::SetRect 
This method sets the dimensions of a CRect object to the specified coordinates. 

void SetRect( 
int x1, 
int y1, 
int x2, 
int y2 ); 

void SetRect( 
Point topLeft, 
POINT bottomRight ); 
Parameters 
x1 
Specifies the x-coordinate of the upper-left corner. 
y1 
Specifies the y-coordinate of the upper-left corner. 
x2 
Specifies the x-coordinate of the lower-right corner. 
y2 
Specifies the y-coordinate of the lower-right corner. 
topLeft 
The coordinates of the top-left corner of the rectangle. 
bottomRight 
The coordinates of the bottom-right corner of the rectangle. 
Example 
CRect rect; 
rect.SetRect(256, 256, 512, 512); 

ASSERT(rect == CRect(256, 256, 512, 512));