php實作在限定的區域裡自動調整字體大小的功能

這篇文章主要介紹了php實作在限定區域裡自動調整字體大小的類別,實例分析了php操作圖片及字體的技巧,具有一定參考借鑒價值,需要的朋友可以參考下

#本文實例講述了php實作在限定區域裡自動調整字體大小的類別。具體如下：

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];
 }
}
?>

使用範例如下：

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);
}
?>

總結：以上就是這篇文章的全部內容，希望能對大家的學習有所幫助。

相關推薦：

php實作新聞發布系統

PHP讀取設定檔類別實例

php產生縮圖的方法

#

以上是php實作在限定的區域裡自動調整字體大小的功能的詳細內容。更多資訊請關注PHP中文網其他相關文章！