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