How can I wrap text using Imagick in PHP so that i

问题:

The Imagick library in PHP allows you to draw text on top of an image. How to I tell Imagick to wrap the text based upon some bounded text box?

i.e. so that the words appear as multiline text rather than a single line.

回答1:

Usage:

list($lines, $lineHeight) = wordWrapAnnotation($image, $draw, $msg, 140);
for($i = 0; $i < count($lines); $i++)
    $image->annotateImage($draw, $xpos, $ypos + $i*$lineHeight, 0, $lines[$i]);

Function:

/* Implement word wrapping... Ughhh... why is this NOT done for me!!!
    OK... I know the algorithm sucks at efficiency, but it's for short messages, okay?

    Make sure to set the font on the ImagickDraw Object first!
    @param image the Imagick Image Object
    @param draw the ImagickDraw Object
    @param text the text you want to wrap
    @param maxWidth the maximum width in pixels for your wrapped "virtual" text box
    @return an array of lines and line heights
*/
function wordWrapAnnotation(&$image, &$draw, $text, $maxWidth)
{
    $words = explode(" ", $text);
    $lines = array();
    $i = 0;
    $lineHeight = 0;
    while($i < count($words) )
    {
        $currentLine = $words[$i];
        if($i+1 >= count($words))
        {
            $lines[] = $currentLine;
            break;
        }
        //Check to see if we can add another word to this line
        $metrics = $image->queryFontMetrics($draw, $currentLine . ' ' . $words[$i+1]);
        while($metrics['textWidth'] <= $maxWidth)
        {
            //If so, do it and keep doing it!
            $currentLine .= ' ' . $words[++$i];
            if($i+1 >= count($words))
                break;
            $metrics = $image->queryFontMetrics($draw, $currentLine . ' ' . $words[$i+1]);
        }
        //We can't add the next word to this line, so loop to the next line
        $lines[] = $currentLine;
        $i++;
        //Finally, update line height
        if($metrics['textHeight'] > $lineHeight)
            $lineHeight = $metrics['textHeight'];
    }
    return array($lines, $lineHeight);
}

回答2:

I found a bug with @BMiner's function where it returns a lineheight of 0 when there is only one word.

I ended up re-writing it in one loop using array functions. I kept the parameters the same so it works with current implementations.

I used preg_split instead so it works well with extra or double spaces, tabs, and line-breaks.

function wordWrapAnnotation($image, $draw, $text, $maxWidth)
{
    $words = preg_split('%\s%', $text, -1, PREG_SPLIT_NO_EMPTY);
    $lines = array();
    $i = 0;
    $lineHeight = 0;

    while (count($words) > 0)
    {
        $metrics = $image->queryFontMetrics($draw, implode(' ', array_slice($words, 0, ++$i)));
        $lineHeight = max($metrics['textHeight'], $lineHeight);

        if ($metrics['textWidth'] > $maxWidth or count($words) < $i)
        {
            $lines[] = implode(' ', array_slice($words, 0, --$i));
            $words = array_slice($words, $i);
            $i = 0;
        }
    }

    return array($lines, $lineHeight);
}

回答3:

I have been using @Sarke's version successfully for a while, but I noticed there is an infinite loop if a word is longer than the $maxWidth. Here is a version that fixes the infinite loop:

function wordWrapAnnotation($image, $draw, $text, $maxWidth)
{   
    $text = trim($text);

    $words = preg_split('%\s%', $text, -1, PREG_SPLIT_NO_EMPTY);
    $lines = array();
    $i = 0;
    $lineHeight = 0;

    while (count($words) > 0)
    {   
        $metrics = $image->queryFontMetrics($draw, implode(' ', array_slice($words, 0, ++$i)));
        $lineHeight = max($metrics['textHeight'], $lineHeight);

        // check if we have found the word that exceeds the line width
        if ($metrics['textWidth'] > $maxWidth or count($words) < $i) 
        {   
            // handle case where a single word is longer than the allowed line width (just add this as a word on its own line?)
            if ($i == 1)
                $i++;

            $lines[] = implode(' ', array_slice($words, 0, --$i));
            $words = array_slice($words, $i);
            $i = 0;
        }   
    }   

    return array($lines, $lineHeight);
}

回答4:

here is my version for one line text container

function GetTextSize($font,$text,$max_weight,$max_width){
$size = $max_weight;
$imagick=new Imagick();
while (true){
    $draw = new ImagickDraw();
    $draw->setFontSize($size);
    $draw->setfont($font);
    $bbox2=$imagick->queryFontMetrics($draw,$text);
    $width_of_text = $bbox2[textWidth];
    if ($width_of_text > $max_width){
        $size -= 1;
    }else{
        break;
        }
    }
    return $size;
}
$draw = new ImagickDraw();
$font="path_to_font.ttf";
$text="Love Happyness Freedom";
$output = new Imagick('path_to_image.jpg');
$output->setGravity(Imagick::GRAVITY_CENTER);
$fontsize=GetTextSize($font,$text,70,600);
$draw->setfont($font);
$draw->setFontSize($fontsize);
$draw->annotation(000, 000, $text);
$output->drawImage($draw);
$output->setImageFormat('jpg');
header('Content-Type: image/jpg');
print $output;

回答5:

Hi i find some sollution thanks for BMinner for his code i edit his code and get good working sollution

USAGE

<?
   $w = 210;
 $h = 520;


$canvas = new Imagick();
$canvas->newImage($w,$h,new ImagickPixel('green'),'png');


$draw = new ImagickDraw();
$draw->setFontSize(25);

$text="SomeTextWithoutSpacesAndGoingOn..xxxxx <br><br>some short words with spaces <br><br>and some text<br>with manuel page<br>break <br><br>and also multiple spaces                      spaces end. also w i t o n e c ha ra c ter";

 list($lines, $lineHeight)= wordWrapAnnotation($canvas, $draw, $text, $w-20);

 $canvas->annotateImage($draw, 10, $lineHeight , 0, $lines);

 header("Content-Type: image/png");
   echo $canvas;

?>

FUNCTIONS REFERANCED FROM BMinner

<?
//this is unicode split method for out of english latin characters
function str_split_unicode($str, $l = 0) {
    if ($l > 0) {
        $ret = array();
        $len = mb_strlen($str, "UTF-8");
        for ($i = 0; $i < $len; $i += $l) {
            $ret[] = mb_substr($str, $i, $l, "UTF-8");
        }
        return $ret;
    }
    return preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY);
} 










//this is my function detects long words and split them 

 function check_long_words($image,$draw,$text,$maxWidth) {
    $metrics = $image->queryFontMetrics($draw, $text);
    if($metrics['textWidth'] <= $maxWidth)
    return array($text);

$words = str_split_unicode($text);



$i = 0;

 while($i < count($words) )
    {
        $currentLine = $words[$i];
        if($i+1 >= count($words))
        {

             $lines[] = $currentLine;
            //$lines = $lines + $checked;
            break;
        }
        //Check to see if we can add another word to this line
        $metrics = $image->queryFontMetrics($draw, $currentLine . $words[$i+1]);

        while($metrics['textWidth'] <= $maxWidth)
        {
            //If so, do it and keep doing it!
            $currentLine .= $words[++$i];
            if($i+1 >= count($words))
                break;
            $metrics = $image->queryFontMetrics($draw, $currentLine . ' ' . $words[$i+1]);
            $t++;
        }
        //We can't add the next word to this line, so loop to the next line


            $lines[] = $currentLine;

        $i++;

    }


return $lines;

}   








//this is BMiner code some fixes for manule breaks
function wordWrapAnnotation(&$image, &$draw, $text, $maxWidth)
{
    $brler = explode("<br>", $text);
    $lines = array();


    foreach($brler as $br)
    {
        $i = 0;


$words = explode(" ", $br);


 while($i < count($words) )
    {

        $currentLine = $words[$i];


 $metrics = $image->queryFontMetrics($draw, $currentLine . ' ' . $words[$i+1]);        

        if($i+1 >= count($words))
        {
            $checked=check_long_words($image,$draw,$currentLine,$maxWidth);
            $lines = array_merge($lines, $checked);

            if($metrics['textHeight'] > $lineHeight)
            $lineHeight = $metrics['textHeight'];
            //$lines = $lines + $checked;
            break;
        }
        //Check to see if we can add another word to this line


        while($metrics['textWidth'] <= $maxWidth)
        {
            //If so, do it and keep doing it!
            $currentLine .= ' ' . $words[++$i];
            if($i+1 >= count($words))
                break;
            $metrics = $image->queryFontMetrics($draw, $currentLine . ' ' . $words[$i+1]);
            $t++;
        }
        //We can't add the next word to this line, so loop to the next line

        $checked=check_long_words($image,$draw,$currentLine,$maxWidth);
            $lines = array_merge($lines, $checked);

        $i++;
        //Finally, update line height
        if($metrics['textHeight'] > $lineHeight)
            $lineHeight = $metrics['textHeight'];
    }




    }
    return array(join("\n",$lines), $lineHeight);



}

?>

AND OUTPUT