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mfc編程題

餅圖?MFC裏提供Pie這個GDI的API了啊

Pie

The Pie function draws a pie-shaped wedge bounded by the intersection of an ellipse and two radials. The pie is outlined by using the current pen and filled by using the current brush.

BOOL Pie(

HDC hdc, // handle to DC

int nLeftRect, // x-coord of upper-left corner of rectangle

int nTopRect, // y-coord of upper-left corner of rectangle

int nRightRect, // x-coord of lower-right corner of rectangle

int nBottomRect, // y-coord of lower-right corner of rectangle

int nXRadial1, // x-coord of first radial's endpoint

int nYRadial1, // y-coord of first radial's endpoint

int nXRadial2, // x-coord of second radial's endpoint

int nYRadial2 // y-coord of second radial's endpoint

);

Parameters

hdc

[in] Handle to the device context.

nLeftRect

[in] Specifies the x-coordinate, in logical coordinates, of the upper-left corner of the bounding rectangle.

nTopRect

[in] Specifies the y-coordinate, in logical coordinates, of the upper-left corner of the bounding rectangle.

nRightRect

[in] Specifies the x-coordinate, in logical coordinates, of the lower-right corner of the bounding rectangle.

nBottomRect

[in] Specifies the y-coordinate, in logical coordinates, of the lower-right corner of the bounding rectangle.

nXRadial1

[in] Specifies the x-coordinate, in logical coordinates, of the endpoint of the first radial.

nYRadial1

[in] Specifies the y-coordinate, in logical coordinates, of the endpoint of the first radial.

nXRadial2

[in] Specifies the x-coordinate, in logical coordinates, of the endpoint of the second radial.

nYRadial2

[in] Specifies the y-coordinate, in logical coordinates, of the endpoint of the second radial.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero.

Windows NT/2000/XP: To get extended error information, call GetLastError.

Remarks

The curve of the pie is defined by an ellipse that fits the specified bounding rectangle. The curve begins at the point where the ellipse intersects the first radial and extends counterclockwise to the point where the ellipse intersects the second radial.

The current position is neither used nor updated by the Pie function.

Windows 95/98/Me: The sum of the coordinates of the bounding rectangle cannot exceed 32,767. The sum of nLeftRect and nRightRect or nTopRect and nBottomRect parameters cannot exceed 32,767.

Requirements

Windows NT/2000/XP: Included in Windows NT 3.1 and later.

Windows 95/98/Me: Included in Windows 95 and later.

Header: Declared in Wingdi.h; include Windows.h.

Library: Use Gdi32.lib.

See Also

Filled Shapes Overview, Filled Shape Functions, AngleArc, Arc, ArcTo, Chord

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