在php中的弯曲文本

Question

我需要水印带有弯曲文字的图像。我已经浏览了一些互联网网站，但我找不到我需要的代码。请告诉我如何在php中生成弯曲文本

感谢致敬

tismon

Answer 1

这可能有所帮助：

https://forums.phpfreaks.com/topic/57542-image-manipulation-skewing-text-text-on-a-curve/

<?php
/*********************************************
* Fitting text to arc
*
* TextOnArc
* Author   :  Barand August2007
**********************************************/
$im = imagecreate(400,400);

$white = imagecolorallocate($im, 0xFF, 0xFF, 0xFF);
$grey  = imagecolorallocate($im, 0xCC, 0xCC, 0xCC);
$txtcol = imagecolorallocate($im, 0xFF, 0x00, 0x00);

$r = 150;
$cx = 200;
$cy = 200;
$txt1 = 'Text on an Arc';
$txt2 = 'by Barand';
$font = 'arial.ttf';
#$font = 'bauhausm.ttf';
$size = 48;

imagearc($im,$cx,$cy,$r*2,$r*2,$s,$e,$grey);
$pad = 2;                      // extra char spacing for text
$s = 180;
$e = 360;
textOnArc($im,$cx,$cy,$r,$s,$e,$txtcol,$txt1,$font,$size,$pad);
$pad = 6;                      // extra char spacing for text
$s = 0;
$e = 180;
textInsideArc($im,$cx,$cy,$r,$s,$e,$txtcol,$txt2,$font,$size,$pad);

header("content-type: image/png");
imagepng($im);
imagedestroy($im);

function textWidth($txt, $font, $size)
{
    $bbox = imagettfbbox($size,0,$font,$txt);
    $w = abs($bbox[4]-$bbox[0]);
    return $w;
}

function textOnArc($im,$cx,$cy,$r,$s,$e,$txtcol,$txt,$font,$size, $pad=0)
{
    $tlen = strlen($txt);
    $arccentre = ($e + $s)/2;
    $total_width = textWidth($txt, $font, $size) - ($tlen-1)*$pad;
    $textangle = rad2deg($total_width / $r);
    $s = $arccentre - $textangle/2;
    $e = $arccentre + $textangle/2;
    for ($i=0, $theta = deg2rad($s); $i < $tlen; $i++)
    {
        $ch = $txt{$i};
        $tx = $cx + $r*cos($theta);
        $ty = $cy + $r*sin($theta);
        $dtheta = (textWidth($ch,$font,$size))/$r;
        $angle = rad2deg(M_PI*3/2 - ($dtheta/2 + $theta) );
        imagettftext($im, $size, $angle, $tx, $ty, $txtcol, $font, $ch);
        $theta += $dtheta;
    }
}

function textInsideArc($im,$cx,$cy,$r,$s,$e,$txtcol,$txt,$font,$size, $pad=0)
{
    $tlen = strlen($txt);
    $arccentre = ($e + $s)/2;
    $total_width = textWidth($txt, $font, $size) + ($tlen-1)*$pad;
    $textangle = rad2deg($total_width / $r);
    $s = $arccentre - $textangle/2;
    $e = $arccentre + $textangle/2;
    for ($i=0, $theta = deg2rad($e); $i < $tlen; $i++)
    {
        $ch = $txt{$i};
        $tx = $cx + $r*cos($theta);
        $ty = $cy + $r*sin($theta);
        $dtheta = (textWidth($ch,$font,$size)+$pad)/$r;
        $angle = rad2deg(M_PI/2 - ($theta - $dtheta/2));
        imagettftext($im, $size, $angle, $tx, $ty, $txtcol, $font, $ch);
        $theta -= $dtheta;
    }
}


?>

Answer 2

请查看以下链接。

http://www.phpjabbers.com/phpexample.php?eid=20

http://articles.sitepoint.com/article/watermark-images-php

http://coding.derkeiler.com/Archive/PHP/alt.php/2004-12/0061.html