ScaleViewportExtEx
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