这篇文章主要介绍了php实现在限定区域里自动调整字体大小的类,实例分析了php操作图片及字体的技巧,具有一定参考借鉴价值,需要的朋友可以参考下
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。具体如下：
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];
}
}
?>使用范例如下：
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);
}
?>总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。
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