如何在PHP中使用Imagick包裹文本，以便将其绘制为多行文本? [英] How can I wrap text using Imagick in PHP so that it is drawn as multiline text?

问题描述

PHP中的Imagick库允许您在图像上方绘制文本.

The Imagick library in PHP allows you to draw text on top of an image.

我如何告诉Imagick根据有界文本框包装文本，以便单词显示为多行文本而不是单行?

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?

推荐答案

用法:

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]);

功能:

/* 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);
}

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