php实现在限定区域里自动调整字体大小的类实例

yipeiwu_com5年前PHP代码库

本文实例讲述了php实现在限定区域里自动调整字体大小的类。分享给大家供大家参考。具体如下:

这里的php类imagefittext.class.php实现在限定的区域里自动调整字体大小的功能。

<?php
// Image Fit Text Class 0.1 by ming0070913
CLASS ImageFitText{
 public $font, $fontsize, $width, $height;
 public $step_wrap, $step_fontsize;
 public function __construct($font, $step_wrap=1, $step_fontsize=1){
  $this->font = $font;
  $this->step_wrap = $step_wrap>1?$step_wrap:1;
  $this->step_fontsize = $step_fontsize>1?$step_fontsize:1;
 }
 function fit($width, $height, $text, $fontsize, $min_fontsize=5, $min_wraplength=0){
  $this->fontsize = & $fontsize;
  $text_ = $text;
  while($this->TextHeight($text_)>$height && $fontsize>$min_fontsize)
   $fontsize -= $this->step_fontsize;
  while(($this->TextWidth($text_)>$width || $this->TextHeight($text_)>$height) && $fontsize>$min_fontsize){
   $fontsize -= $this->step_fontsize;
   $wraplength = $this->maxLen($text);
   $text_ = $text;
   while($this->TextWidth($text_)>$width && $wraplength>=$min_wraplength+$this->step_wrap){
    $wraplength -= $this->step_wrap;
    $text_ = wordwrap($text, $wraplength, "\n", true);
    //To speed up:
    if($this->TextHeight($text_)>$height) break;
    if($wraplength<=$min_wraplength) break;
    $wraplength_ = $wraplength;
    $wraplength = ceil($wraplength/($this->TextWidth($text_)/$width));
    $wraplength = $wraplength<($min_wraplength+$this->step_wrap)?($min_wraplength+$this->step_wrap):$wraplength;
   }
  }
  $this->width = $this->TextWidth($text_);
  $this->height = $this->TextHeight($text_);
  return array("fontsize"=>$fontsize, "text"=>$text_, "width"=>$this->width, "height"=>$this->height);
 }
 function maxLen($text){
  $lines = explode("\n", str_replace("\r", "", $text));
  foreach($lines as $line)
   $t[] = strlen($line);
  return max($t);
 }
 function TextWidth($text){
  $t = imagettfbbox($this->fontsize, 0, $this->font, $text);
  return $t[2]-$t[0];
 }
 function TextHeight($text){
  $t = imagettfbbox($this->fontsize, 0, $this->font, $text);
  return $t[1]-$t[7];
 }
}
?>

使用范例如下:

<?php
// Image Fit Text Class 0.1 by ming0070913
// Example File
include "imagefittext.class.php";
// Settings :
// The text
$text = "PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual.";
// The maximun width
$width = 200;
// The maximun height
$height = 100;
// Position of the text and the box
$x1 = 50;
$y1 = 50;
// The starting font size
$fontsize = 10;
// The minimun font size. The script will stop if it cannot fit the text even with this size.
$min_fontsize = 3;
// The minimun wrap length for each line. The script will try another font size if it cannot fit the text even with this wrap length.
$min_wraplength = 0;
// The font
$font = "arial.ttf";
// The space between the box and the text. It's independent to the script which can be ignored
$padding = 3;
// If the script cannot fit the text for certain wrap length, it will try the wrap length again with the reduction in this value.
// It reduce the accuracy, but will slightly speed up the process.
$step_wrap = 1;
// If the script cannot fit the text for certain font size, it will try the the font size again with the reduction in this value.
// It reduce the accuracy, but will slightly speed up the process.
$step_fontsize = 1;
// Create a image
$im = @imagecreatetruecolor($width+$x1*2, $height+$y1*2+80) or die('Cannot Initialize new GD image stream');
// Start the timer
$time_start = microtime_float();
// The class
$imagefittext = new ImageFitText($font, $step_wrap, $step_fontsize);
// Fit the text
// It returns the result in a array with "fontsize", "text", "width", "height"
$fit = $imagefittext->fit($width-$padding*2, $height-$padding*2, $text, $fontsize, $min_fontsize, $min_wraplength);
// Stop the timer
$time = round(microtime_float()-$time_start, 3);
$white = imagecolorallocate($im, 255, 255, 255);
// Draw a box
imagerectangle($im, $x1, $y1, $x1+$width, $y1+$height, $white);
// Write the text            +8 because the text will move up originally
imagettftext($im, $fit['fontsize'], 0, $x1+$padding, $y1+$padding+8, $white, $font, $fit['text']);
// Print some info. about the text
imagestring($im, 5, $x1, $y1+$height+30, 'Fontsize : '.$fit['fontsize'], $white);
imagestring($im, 5, $x1, $y1+$height+45, 'Text Size : '.$fit['width']."x".$fit['height'], $white);
imagestring($im, 5, $x1, $y1+$height+60, 'Box Size : '.($width-$padding*2)."x".($height-$padding*2), $white);
imagestring($im, 5, $x1, $y1+$height+75, 'Time used : '.$time.'s', $white);
// Print the image
header ('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
function microtime_float(){ // Timer
 list($usec, $sec) = explode(" ", microtime());
 return ((float)$usec + (float)$sec);
}
?>

希望本文所述对大家的php程序设计有所帮助。

相关文章

php从数组中随机抽取一些元素的代码

复制代码 代码如下: <?php class getValues { public function inputValue($inputArray) { $this->inp...

php中sprintf与printf函数用法区别解析

下面是一个示例:四舍五入保留小数点后两位 复制代码 代码如下:<?php$num1 = 21;echo sprintf("%0.2f",$num1)."<br />";...

ThinkPHP模型详解

模型定义,默认情况下,ThinkPHP的模型类是位于/Home/Model/目录之下,模型类通常需要继承系统的\Think\Model类或其子类,下面是一个Home\Model\User...

自动把纯文本转换成Web页面的php代码

首先让我们来看一个我朋友希望转换的纯文本文件的例子: 以下为引用的内容: 复制代码 代码如下:   Green for Mars!   John R. Doe   The idea of...

php编程实现简单的网页版计算器功能示例

php编程实现简单的网页版计算器功能示例

本文实例讲述了php编程实现简单的网页版计算器功能。分享给大家供大家参考,具体如下: 如何通过php代码来实现一个网页版的计算器的简单功能?下面就是通过php基础知识来做的网页版计算器,...