|
Syntax |
XPRINT STRETCH hndl,
id, (x1,y1)-(x2,y2) TO (x3,y3)-(x4,y4) [,mix,
stretch] |
|
Remarks |
You can copy a complete bitmap, or a portion of
it, to the host printer page, while resizing it to a larger or smaller
size. The
expression hndl specifies the
handle of the source bitmap or window. The
expression id& is the unique
control
in the range 1 to 65535, as assigned with the CONTROL
ADD GRAPHIC statement. id&
must be 0 for a GRAPHIC WINDOW
or a
GRAPHIC BITMAP
. The destination of the copy operation is the host printer page. The
bitmap is automatically resized to fit the destination parameters. You
must use care that your parameters are valid for the specified bitmaps,
or results of the operation are undefined.
If the mix parameter is included, it is one of the
values in the following table. If
not included, a default of %MIX_COPYSRC is presumed. There
are 8 mix modes available to use for mixing drawing colors with the colors
which already exist at the at the drawing location. The
mix mode equates are predefined in PowerBASIC.
|
%MIX_NOTMERGESRC |
Pixel is the inverse of
the MergeSrc color. |
|
%MIX_NOTCOPYSRC |
Pixel is the inverse of
the source color. |
|
%MIX_MASKSRCNOT |
Pixel is a combination
of the colors common to both the source and the inverse of the pixel. |
|
%MIX_XORSRC |
Pixel is a combination
of the colors in the source and the pixel, but not in both. |
|
%MIX_MASKSRC |
Pixel is a combination
of the colors common to both the source and the pixel. |
|
%MIX_MERGENOTSRC |
Pixel is a combination
of the pixel color and the and the inverse of the source color. |
|
%MIX_COPYSRC |
Pixel is the source color
(default). |
|
%MIX_MERGESRC |
Pixel is a combination
of the source color and the pixel color. |
If the stretch parameter is included, it is one
of the values in the following table. If
not included, or it is the value zero (0), the stretch mode is unchanged.
An appropriate
choice of stretch mode can substantially enhance the quality of bitmaps
which are changed in size. The stretch mode equates are predefined in
PowerBASIC.
The 4 stretch modes are:
|
%BLACKONWHITE |
This is the default Windows stretch mode, and is most appropriate for
monochrome bitmaps, or those with blocks of color. Performs
a boolean OR of eliminated and existing pixels. It
preserves black pixels at the expense of white pixels. |
|
%WHITEONBLACK |
Performs a boolean OR of eliminated and existing pixels. It
preserves white pixels at the expense of black pixels. |
|
%COLORONCOLOR |
Deletes eliminated lines of pixels without trying to preserve their
information. |
|
%HALFTONE |
This provides the highest quality for complex color bitmaps. The
average color of the destination pixel block is kept approximately the
same as the source pixel block. |
|
