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18 years ago
An improvement to the convertBoundingBox function. The previous function was completely wrong. My confusion came from characters like "1" and "_" that are rendered to the right or below the basepoint (in the font I'm using). I ended up using mike at mikeleigh dot com's function with a fix for these characters, and a "belowBasepoint" value.
<?php
function convertBoundingBox ($bbox) {
    if ($bbox[0] >= -1)
        $xOffset = -abs($bbox[0] + 1);
    else
        $xOffset = abs($bbox[0] + 2);
    $width = abs($bbox[2] - $bbox[0]);
    if ($bbox[0] < -1) $width = abs($bbox[2]) + abs($bbox[0]) - 1;
    $yOffset = abs($bbox[5] + 1);
    if ($bbox[5] >= -1) $yOffset = -$yOffset; // Fixed characters below the baseline.
    $height = abs($bbox[7]) - abs($bbox[1]);
    if ($bbox[3] > 0) $height = abs($bbox[7] - $bbox[1]) - 1;
    return array(
        'width' => $width,
        'height' => $height,
        'xOffset' => $xOffset, // Using xCoord + xOffset with imagettftext puts the left most pixel of the text at xCoord.
        'yOffset' => $yOffset, // Using yCoord + yOffset with imagettftext puts the top most pixel of the text at yCoord.
        'belowBasepoint' => max(0, $bbox[1])
    );
}
?>
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