The ScaleViewportExtEx function modifies the viewport for a device context (DC) by using the ratios formed by the specified multiplicands and divisors.
BOOL ScaleViewportExtEx(
| HDC hdc, | // handle of device context |
| int Xnum, | // horizontal multiplicand |
| int Xdenom, | // horizontal divisor |
| int Ynum, | // vertical multiplicand |
| int Ydenom, | // vertical divisor |
| LPSIZE lpSize | // address of previous viewport extents |
| ); |
Parameters
hdc
Identifies the device context.
Xnum
Specifies the amount by which to multiply the current horizontal extent.
Xdenom
Specifies the amount by which to divide the current horizontal extent.
Ynum
Specifies the amount by which to multiply the current vertical extent.
Ydenom
Specifies the amount by which to divide the current vertical extent.
lpSize
Points to a SIZE structure. The previous viewport extents (in device units) are placed in this structure. If lpSize is NULL, nothing is returned.
Return Values
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero.
Remarks
The viewport extents are modified as follows:
xNewVE = (xOldVE * Xnum) / Xdenom
yNewVE = (yOldVE * Ynum) / Ydenom
See Also