Php/docs/function.ps-begin-page
ps_begin_page
(PECL ps >= 1.1.0)
ps_begin_page — Start a new page
说明
ps_begin_page
( resource $psdoc
, float $width
, float $height
) : bool
Starts a new page. Although the parameters width
and height imply a different page size for each
page, this is not possible in PostScript. The first call of
ps_begin_page() will set the page size for the whole
document. Consecutive calls will have no effect, except for creating a new
page. The situation is different if you intent to convert the PostScript
document into PDF. This function places pdfmarks into the document which
can set the size for each page indiviually. The resulting PDF document will
have different page sizes.
Though PostScript does not know different page sizes, pslib places a bounding box for each page into the document. This size is evaluated by some PostScript viewers and will have precedence over the BoundingBox in the Header of the document. This can lead to unexpected results when you set a BoundingBox whose lower left corner is not (0, 0), because the bounding box of the page will always have a lower left corner (0, 0) and overwrites the global setting.
Each page is encapsulated into save/restore. This means, that most of the settings made on one page will not be retained on the next page.
If there is up to the first call of ps_begin_page() no
call of ps_findfont(), then the header of the PostScript
document will be output and the bounding box will be set to the size of
the first page. The lower left corner of the bounding box is set to (0, 0).
If ps_findfont() was called before, then the
header has been output already, and the document will not have a valid
bounding box. In order to prevent this, one should call
ps_set_info() to set the info field
BoundingBox and possibly Orientation
before any ps_findfont() or
ps_begin_page() calls.
Note:
Up to version 0.2.6 of pslib, this function will always overwrite the BoundingBox and Orientation, if it has been set before with ps_set_info() and ps_findfont() has not been called before.
参数
psdoc- Resource identifier of the postscript file as returned by ps_new().
width- The width of the page in pixel, e.g. 596 for A4 format.
height- The height of the page in pixel, e.g. 842 for A4 format.
返回值
成功时返回 true， 或者在失败时返回 false。
参见
- ps_end_page() - End a page
- ps_findfont() - Loads a font
- ps_set_info() - Sets information fields of document
