php实现在限定区域里自动调整字体大小的类实例
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。
<?php
//ImageFitTextClass0.1byming0070913
CLASSImageFitText{
public$font,$fontsize,$width,$height;
public$step_wrap,$step_fontsize;
publicfunction__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?$step_fontsize:1;
}
functionfit($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,$wraplength,"\n",true);
//Tospeedup:
if($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($text_);
returnarray("fontsize"=>$fontsize,"text"=>$text_,"width"=>$this->width,"height"=>$this->height);
}
functionmaxLen($text){
$lines=explode("\n",str_replace("\r","",$text));
foreach($linesas$line)
$t[]=strlen($line);
returnmax($t);
}
functionTextWidth($text){
$t=imagettfbbox($this->fontsize,0,$this->font,$text);
return$t[2]-$t[0];
}
functionTextHeight($text){
$t=imagettfbbox($this->fontsize,0,$this->font,$text);
return$t[1]-$t[7];
}
}
?>
使用范例如下：
<?php
//ImageFitTextClass0.1byming0070913
//ExampleFile
include"imagefittext.class.php";
//Settings:
//Thetext
$text="PHPisawidely-usedgeneral-purposescriptinglanguagethatisespeciallysuitedforWebdevelopmentandcanbeembeddedintoHTML.IfyouarenewtoPHPandwanttogetsomeideaofhowitworks,trytheintroductorytutorial.Afterthat,checkouttheonlinemanual.";
//Themaximunwidth
$width=200;
//Themaximunheight
$height=100;
//Positionofthetextandthebox
$x1=50;
$y1=50;
//Thestartingfontsize
$fontsize=10;
//Theminimunfontsize.Thescriptwillstopifitcannotfitthetextevenwiththissize.
$min_fontsize=3;
//Theminimunwraplengthforeachline.Thescriptwilltryanotherfontsizeifitcannotfitthetextevenwiththiswraplength.
$min_wraplength=0;
//Thefont
$font="arial.ttf";
//Thespacebetweentheboxandthetext.It'sindependenttothescriptwhichcanbeignored
$padding=3;
//Ifthescriptcannotfitthetextforcertainwraplength,itwilltrythewraplengthagainwiththereductioninthisvalue.
//Itreducetheaccuracy,butwillslightlyspeeduptheprocess.
$step_wrap=1;
//Ifthescriptcannotfitthetextforcertainfontsize,itwilltrythethefontsizeagainwiththereductioninthisvalue.
//Itreducetheaccuracy,butwillslightlyspeeduptheprocess.
$step_fontsize=1;
//Createaimage
$im=@imagecreatetruecolor($width+$x1*2,$height+$y1*2+80)ordie('CannotInitializenewGDimagestream');
//Startthetimer
$time_start=microtime_float();
//Theclass
$imagefittext=newImageFitText($font,$step_wrap,$step_fontsize);
//Fitthetext
//Itreturnstheresultinaarraywith"fontsize","text","width","height"
$fit=$imagefittext->fit($width-$padding*2,$height-$padding*2,$text,$fontsize,$min_fontsize,$min_wraplength);
//Stopthetimer
$time=round(microtime_float()-$time_start,3);
$white=imagecolorallocate($im,255,255,255);
//Drawabox
imagerectangle($im,$x1,$y1,$x1+$width,$y1+$height,$white);
//Writethetext+8becausethetextwillmoveuporiginally
imagettftext($im,$fit['fontsize'],0,$x1+$padding,$y1+$padding+8,$white,$font,$fit['text']);
//Printsomeinfo.aboutthetext
imagestring($im,5,$x1,$y1+$height+30,'Fontsize:'.$fit['fontsize'],$white);
imagestring($im,5,$x1,$y1+$height+45,'TextSize:'.$fit['width']."x".$fit['height'],$white);
imagestring($im,5,$x1,$y1+$height+60,'BoxSize:'.($width-$padding*2)."x".($height-$padding*2),$white);
imagestring($im,5,$x1,$y1+$height+75,'Timeused:'.$time.'s',$white);
//Printtheimage
header('Content-Type:image/png');
imagepng($im);
imagedestroy($im);
functionmicrotime_float(){//Timer
list($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。