PHP kézikönyv
Előző |  | Következő

# ps_rotate

(PECL)

ps_rotate -- Sets rotation factor

## Leírás

bool ps_rotate ( resource psdoc, float rot )

Sets the rotation of the coordinate system.

## Paraméterek

psdoc

  Resource identifier of the postscript file as returned by ps_new().

rot

  Angle of rotation in degree.

## Visszatérési értékek

Siker esetén `TRUE` értékkel tér vissza, ellenkező esetben `FALSE` értéket ad.

## Példák

Példa 1. Rotation of the coordinate system
`<?php function rectangle($ps) { ps_moveto($ps, 0, 0); ps_lineto($ps, 0, 50); ps_lineto($ps, 50, 50); ps_lineto($ps, 50, 0); ps_lineto($ps, 0, 0); ps_stroke($ps); } $ps = ps_new(); if (!ps_open_file($ps, "rotation.ps")) { print "Cannot open PostScript file\n"; exit; } ps_set_info($ps, "Creator", "rotation.php"); ps_set_info($ps, "Author", "Uwe Steinmann"); ps_set_info($ps, "Title", "Rotation example"); ps_set_info($ps, "BoundingBox", "0 0 596 842"); $psfont = ps_findfont($ps, "Helvetica", "", 0); ps_begin_page($ps, 596, 842); ps_set_text_pos($ps, 100, 100); ps_save($ps); ps_translate($ps, 100, 100); ps_rotate($ps, 45); rectangle($ps); ps_restore($ps); ps_setfont($ps, $psfont, 8.0); ps_show($ps, "Text without rotation"); ps_end_page($ps); ps_delete($ps); ?>`
The above example illustrates a very common way of rotating a graphic (in this case just a rectangle) by simply rotating the coordinate system. Since the graphic's coordinate system assumes (0,0) to be the origin, the page coordinate system is also translated to place the graphics not on the edge of the page. Pay attention to the order of ps_translate() and ps_rotate(). In the above case the rectancle is rotated around the point (100, 100) in the untranslated coordinate system. Switching the two statements has a completely different result. In order to output the following text at the original position, all modifications of the coordinate system are encapsulated in ps_save() and ps_restore().

## Lásd még

ps_scale()
ps_translate()

Előző | Tartalom | Következő
ps_restore | Fel | ps_save