status = page:Concat(a, b, c, d, x, y)
page:Concat()
concatenates the page's current transformation matrix and the specified matrix.
For example, if you want to rotate the coordinate system of the page by 45 degrees, use page:Concat()
as follows:
Local rad1 = 45 / 180 * #PI page:Concat(Cos(rad1),Sin(rad1),-Sin(rad1),Cos(rad1),220,350) |
To change the coordinate system of the page to 300 dpi, use page:Concat()
as follows:
page:Concat(72.0 / 300.0, 0, 0, 72.0 / 300.0, 0, 0) |
Invoke page:GSave() before page:Concat()
. Then the change by page:Concat()
can be
restored by invoking page:GRestore().
; save the current graphics states page:GSave(page) ; concatenate the transformation matrix page:Concat(72.0 / 300.0, 0, 0, 72.0 / 300.0, 0, 0) ; show text on the translated coordinates page:BeginText() page:MoveTextPos(50, 100) page:ShowText("Text on the translated coordinates") page:EndText(page) ; restore the graphics states page:GRestore() |
An application can invoke page:GSave() when the graphics mode of the page is in #HPDF_GMODE_PAGE_DESCRIPTION
.
Returns #HPDF_OK
on success.
Otherwise, returns an error code and the error handler is invoked.