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pdf_setmatrix — Explicitly set the current transformation matrix.


bool pdf_setmatrix(pdf, a, b, c, d, e, f);
resource pdf: PDF object identifier
double a: Matrix value
double b: Matrix value
double c: Matrix value
double d: Matrix value
double e: Matrix value
double f: Matrix value


Always TRUE


This is a slightly more low-level version of other the transformation functions including pdf_scale() , pdf_rotate() , and pdf_translate() . The exception however, is that the transformation matrix is reset each time rather than remainiing and affecting other objects.

When applying several transformations, it is always a good idea to specify them in the correct order so the results are more predictable. The best way to do multiple translations is to first translate, then rotate and finaly scale and skew.

In pdf_setmatrix() , the transformation matrix is specified by six parameters, combinations of which affect the amount of translation that occurs. Different pairs of numbers cause each trnasformation. Translations are specified as

translate pdf_setmatrix($pdf, 1, 0, 0, 1, tx, ty)() tx and ty specify the translation in the x and y axes
scale pdf_setmatrix($pdf, sx, 0, 0, sy, 0, 0)() sx and sy specify the scaling in the x and y directions
rotate pdf_setmatrix($pdf, cosa, sina, -sina, cosa, 0, 0)() Rotate the coordinate system by an angle a counterclockwise
skew pdf_setmatrix($pdf, 1, tana, tanb, 1, 0, 0)() Skews the x axis by an angle a and the y axis by angle b


Since version 4.0.5

See also

See also: pdf_translate, pdf_scale, pdf_rotate


Example 979. Show each transformation


// create new document
$pdf = pdf_new();
pdf_begin_page($pdf, 500, 700);

$font = pdf_findfont($pdf, "Courier", "host", 0);
pdf_setfont($pdf, $font, 50);

// display as normal
pdf_set_text_pos($pdf, 10, 10);
pdf_show($pdf, "Norm");

// translate
pdf_setmatrix($pdf, 1, 0, 0, 1, 100, 100);
pdf_set_text_pos($pdf, 10, 10);
pdf_show($pdf, "Trans");

// rotate
pdf_setmatrix($pdf, 0.7, 0.7, -0.7, 0.7, 0, 0);
pdf_set_text_pos($pdf, 150, 50);
pdf_show($pdf, "Rotate");

// scale
pdf_setmatrix($pdf, 2, 0, 0, 2, 0, 0);
pdf_set_text_pos($pdf, 75, 75);
pdf_show($pdf, "Scale");

// skew
pdf_setmatrix($pdf, 1, 0.58, 0.58, 1, 0, 0);
pdf_set_text_pos($pdf, 130, 130);
pdf_show($pdf, "Skew");

// output document
$data = pdf_get_buffer($pdf);
header("Content-type: application/pdf");
header("Content-disposition: inline; filename=test.pdf");
header("Content-length: " . strlen($data));
echo $data;

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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