Question

用mfc画圆时 pDC->Ellipse（0，25，37，46） 里面的参数各代表什么意思啊

Answer 1

左上角和右下角的坐标

CDC::Ellipse
BOOL Ellipse( int x1, int y1, int x2, int y2 );

BOOL Ellipse( LPCRECT lpRect );

Return Value

Nonzero if the function is successful; otherwise 0.

Parameters

x1

Specifies the logical x-coordinate of the upper-left corner of the ellipse’s bounding rectangle.

y1

Specifies the logical y-coordinate of the upper-left corner of the ellipse’s bounding rectangle.

x2

Specifies the logical x-coordinate of the lower-right corner of the ellipse’s bounding rectangle.

y2

Specifies the logical y-coordinate of the lower-right corner of the ellipse’s bounding rectangle.

lpRect

Specifies the ellipse’s bounding rectangle. You can also pass a CRect object for this parameter