PHP:imageftbbox()的用法_GD库图像处理函数(php imagettftext)

imageftbbox

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(PHP 4 >= 4.0.7, PHP 5)

imageftbbox — 给出一个使用 FreeType 2 字体的文本框

说明 array imageftbbox ( float $size , float $angle , string $fontfile , string $text [, array $extrainfo ] )

This function calculates and returns the bounding box in pixels for a FreeType text.

参数

size

字体的尺寸。根据 GD 的版本，为像素尺寸（GD1）或点（磅）尺寸（GD2）。

angle

Angle in degrees in which text will be measured.

fontfile

The name of the TrueType font file (can be a URL). Depending on which version of the GD library that PHP is using, it may attempt to search for files that do not begin with a leading &#;/&#; by appending &#;.ttf&#; to the filename and searching along a library-defined font path.

text

The string to be measured.

extrainfo

Possible array indexes for extrainfo Key Type Meaning linespacing float Defines drawing linespacing

返回值

imageftbbox() returns an array with 8 elements representing four points making the bounding box of the text: 0 lower left corner, X position 1 lower left corner, Y position 2 lower right corner, X position 3 lower right corner, Y position 4 upper right corner, X position 5 upper right corner, Y position 6 upper left corner, X position 7 upper left corner, Y position

The points are relative to the text regardless of the angle, so "upper left" means in the top left-hand corner seeing the text horizontally.

范例

Example #1 imageftbbox() example

<?php//Createaximage$im=imagecreatetruecolor(,);$black=imagecolorallocate($im,0,0,0);$white=imagecolorallocate($im,,,);//Setthebackgroundtobewhiteimagefilledrectangle($im,0,0,,,$white);//Pathtoourfontfile$font='./arial.ttf';//Firstwecreateourboundingbox$bbox=imageftbbox(,0,$font,'ThePHPDocumentationGroup');//ThisisourcordinatesforXandY$x=$bbox[0]+(imagesx($im)/2)-($bbox[4]/2)-5;$y=$bbox[1]+(imagesy($im)/2)-($bbox[5]/2)-5;imagefttext($im,,0,$x,$y,$black,$font,'ThePHPDocumentationGroup');//Outputtobrowserheader('Content-Type:image/png');imagepng($im);imagedestroy($im);?>

注释

Note: 此函数需要 GD 2.0.1 或更高版本(推荐 2.0. 及更高版本)。

Note: 此函数仅在PHP 编译时加入 freetype 支持时有效（--with-freetype-dir=DIR）。

更新日志

版本 说明 4.3.5 extrainfo was made optional.

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