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 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。

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