ps_translate

(PECL ps >= 1.1.0)

ps_translateSets translation

Descrição

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

Sets a new initial point of the coordinate system.

Parâmetros

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.

Valor Retornado

Retorna TRUE em caso de sucesso ou FALSE em caso de falha.

Exemplos

Exemplo #1 Translation of the coordinate system

<?php
function rectangle($ps) {
    
ps_moveto($ps00);
    
ps_lineto($ps050);
    
ps_lineto($ps5050);
    
ps_lineto($ps500);
    
ps_lineto($ps00);
    
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($ps596842);
ps_set_text_pos($ps100100);
ps_translate($ps500750);
rectangle($ps);
ps_translate($ps, -500, -750);
ps_setfont($ps$psfont8.0);
ps_show($ps"Text at initial position");
ps_end_page($ps);

ps_begin_page($ps596842);
ps_set_text_pos($ps100100);
ps_save($ps);
ps_translate($ps500750);
rectangle($ps);
ps_restore($ps);
ps_setfont($ps$psfont8.0);
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 be 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.

Veja Também

add a note add a note

User Contributed Notes

There are no user contributed notes for this page.
To Top