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cpdf_set_text_matrix
Description
This is a slightly more low-level version of other the transformation functions including cpdf_scale() , cpdf_rotate() , and cpdf_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 cpdf_set_text_matrix() , the transformation matrix is specified by an array of six elements, combinations of which affect the amount of translation that occurs. Different pairs of numbers cause each trnasformation. Translations are specified as
| translate | 1, 0, 0, 1, tx, ty | tx and ty specify the translation in the x and y axes |
| scale | sx, 0, 0, sy, 0, 0 | sx and sy specify the scaling in the x and y directions |
| rotate | cosa, sina, -sina, cosa, 0, 0 | Rotate the coordinate system by an angle a counterclockwise |
| skew | 1, tana, tanb, 1, 0, 0 | Skews the x axis by an angle a and the y axis by angle b |
Example
Example 160. Set different text transformations
// start a PDF document $cpdf = cpdf_open(0, "test.pdf"); // create a 600x400 page cpdf_page_init($cpdf, 1, 0, 600, 400, 1); cpdf_begin_text($cpdf); cpdf_set_font($cpdf, "Helvetica", 15, "WinAnsiEncoding"); // display as normal cpdf_text($cpdf, "Norm", 10, 10); // translate cpdf_set_text_matrix($cpdf, array(1, 0, 0, 1, 100, 100)); cpdf_text($cpdf, "trans", 10, 10); // rotate cpdf_set_text_matrix($cpdf, array(0.7, 0.7, -0.7, 0.7, 0, 0)); cpdf_text($cpdf, "roatte", 10, 10); // scale cpdf_set_text_matrix($cpdf, array(2, 0, 0, 2, 0, 0)); cpdf_text($cpdf, "scale", 10, 10); // skew cpdf_set_text_matrix($cpdf, array(1, 0.58, 0.58, 1, 0, 0)); cpdf_text($cpdf, "skew", 10, 10); cpdf_end_text($cpdf); // close and write document cpdf_finalize($cpdf); cpdf_close($cpdf);