本文介绍了如何在PHP中使用Imagick包裹文本,以便将其绘制为多行文本?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
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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