Question

MFC中pDC->Ellipse画同心圆后边跟的4个参数都代表什么啊

Answer 1

BOOL Ellipse(
int x1,
int y1,
int x2,
int y2
);
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.

画椭圆，是以椭圆外接的矩形为标准的。
1，2参数代表这个矩形的左上角坐标，
3，4参数代表这个矩形的右下角坐标。