Compzone.Org :: Podręcznik PHP :: ps_translate

Podręcznik PHP
Poprzedni		Następny

ps_translate

(PECL)

ps_translate -- Sets translation

Opis

bool ps_translate ( resource psdoc, float x, float y )

Sets a new initial point of the coordinate system.

Parametry

psdoc: Resource identifier of the postscript file as returned by ps_new().
x: x-coordinate of the origin of the translated coordinate system.
y: y-coordinate of the origin of the translated coordinate system.

Zwracane wartości

Zwraca TRUE w przypadku sukcesu, FALSE w przypadku porażki.

Przykłady

Przykład 1. Translation 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, "translate.ps")) {

                  print "Cannot open PostScript file\n";


                  exit;

                }

                
ps_set_info($ps, "Creator", "translate.php");
ps_set_info($ps, "Author", "Uwe Steinmann");
ps_set_info($ps, "Title", "Translated 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_translate($ps, 500, 750);
rectangle($ps);
ps_translate($ps, -500, -750);
ps_setfont($ps, $psfont, 8.0);
ps_show($ps, "Text at initial position");

                ps_end_page($ps);

                
ps_begin_page($ps, 596, 842);
ps_set_text_pos($ps, 100, 100);
ps_save($ps);
ps_translate($ps, 500, 750);
rectangle($ps);
ps_restore($ps);
ps_setfont($ps, $psfont, 8.0);
ps_show($ps, "Text at initial position");

                ps_end_page($ps);

                
ps_delete($ps);
?>

The above example demonstrates two possible ways to place a graphic (in this case just a rectangle) at any position on the page, while the graphic itself uses its own coordinate system. The trick is to change the origin of the current coordinate system before drawing the rectangle. The translation has to undone after the graphic has been drawn.

On the second page a slightly different and more elegant approach is applied. Instead of undoing the translation with a second call of ps_translate() the graphics context is saved before modifying the coordinate system and restored after drawing the rectangle.

Patrz także

ps_scale()

ps_rotate()

Poprzedni	Spis treści	Następny
ps_symbol	Początek rozdziału	Pspell Functions