PHP: imagepsbbox

Description

array imagepsbbox ( string text, int font, int size [, int space, int tightness, float angle] )

size is expressed in pixels.

space allows you to change the default value of a space in a font. This amount is added to the normal value and can also be negative.

tightness allows you to control the amount of white space between characters. This amount is added to the normal character width and can also be negative.

angle is in degrees.

Parameters space and tightness are expressed in character space units, where 1 unit is 1/1000th of an em-square.

Parameters space, tightness, and angle are optional.

The bounding box is calculated using information available from character metrics, and unfortunately tends to differ slightly from the results achieved by actually rasterizing the text. If the angle is 0 degrees, you can expect the text to need 1 pixel more to every direction.

Notatka: Ta funkcja jest dostępna tylko jeśli PHP zostało skompilowane z dyrektywą --enable-t1lib.

This function returns an array containing the following elements:

0	lower left x-coordinate
1	lower left y-coordinate
2	upper right x-coordinate
3	upper right y-coordinate

See also imagepstext().


When using imagepsbbox, you are probably trying to do something like creating a button with text, so that the button is large enough for the text...

Below is a very simple example of making a black button just big enough to display white text on it.



<?php 



//if text is no variable set sample text

if (!$text)

    $text = "This is a sample text";

    

// set the font size

$fontsize=14;



// load the font to use

$font=ImagePsLoadFont("/fonts/ariam___.pfb");



//get the left lower corner and the right upper

list($lx,$ly,$rx,$ry) = imagepsbbox($text,$font,$fontsize,0,0,0);



// calculate the size of the text

$textwidth = $rx - $lx;

$textheight = $ry - $ly;



// make an image 40 pixels wider and 20 pixels higher than the text

$imh = $textheight + 20;

$imw = $textwidth + 40;

$im = imageCreate( $imw, $imh );



//define colors, first color is used as background color!

$black  = ImageColorAllocate ($im, 0, 0, 0);

$white = ImageColorAllocate ($im, 255, 255, 255);



//create the text (with the same parameters as imagepsbbox!)

ImagePSText ($im, "$text", $font, $fontsize, $white, $white, 20, 20,'','','',4);



//send the header

header("Content-type: image/jpeg");



// create the image

ImageJPEG ($im,"",100);



//destroy the image & font to free memory

Imagepsfreefont ( $font );

ImageDestroy ( $im );



?>

imagepsbbox

Description

User Contributed Notes