How can I wrap text using Imagick in PHP so that it is drawn as multiline text?

2023-02-27 10:38 问答作者：

The Imagick library in PHP allows you to draw text on top of an ima开发者_运维百科ge.

How can I tell Imagick to wrap the text based upon some bounded text box, so that the words appear as multiline text rather than a single line?

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);
}

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);
}

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);
}

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;

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

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