php实现在限定区域里自动调整字体大小的类实例，字体大小实例本文实例讲述了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。
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($wraplengthtextwidth($text_)/$width)); $wraplength = $wraplengthstep_wrap)?($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($im, 255, 255, 255);// draw a boximagerectangle($im, $x1, $y1, $x1+$width, $y1+$height, $white);// write the text +8 because the text will move up originallyimagettftext($im, $fit['fontsize'], 0, $x1+$padding, $y1+$padding+8, $white, $font, $fit['text']);// print some info. about the textimagestring($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', $white);// print the imageheader ('content-type: image/png');imagepng($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。
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