Imagick::queryFontMetrics

(PECL imagick 2.0.0)

Imagick::queryFontMetricsRetourne un tableau représentant les dimensions de la police

Description

array Imagick::queryFontMetrics ( ImagickDraw $properties , string $text [, bool $multiline ] )

Retourne un tableau multi-dimensionnel représentant les dimensions de la police.

Liste de paramètres

properties

Un objet ImagickDraw contenant des attributs de police

text

Le texte

multiline

Un paramètre multiligne. S'il est laissé vide, il est auto-détecté.

Valeurs de retour

Retourne un tableau de plusieurs dimensions contenant les dimensions de la police.

Erreurs / Exceptions

Lance une exception ImagickException si une erreur survient.

Exemples

Exemple #1 Exemple avec Imagick::queryFontMetrics()

Demande les dimensions du texte, et affiche les valeurs à l'écran

<?php
/* Crée un nouvel objet Imagick */
$im = new Imagick();

/* Crée un objet ImagickDraw */
$draw = new ImagickDraw();

/* Configure la police */
$draw->setFont('/path/to/font.ttf');

/* Affiche les dimensions de la police, auto-détecte le multiligne */
var_dump($im->queryFontMetrics($draw"Hello World!"));
?>

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User Contributed Notes 7 notes

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1
SkepticaLee
10 months ago
The values do not match the array descriptors at all. If you have to know exactly how much space is being taken up by an annotation, use the following:

<?php
$text
= "Algbqdj";
$im = new Imagick ();
$draw = new ImagickDraw ();
$draw->setStrokeColor ("none");
$draw->setFont ("Arial");
$draw->setFontSize (96);
$draw->setTextAlignment (Imagick::ALIGN_LEFT);
$metrics = $im->queryFontMetrics ($draw, $text);
//these are the values which accurately described the extent of the text and where it is to be drawn:
$baseline = $metrics['boundingBox']['y2'];
$textwidth = $metrics['textWidth'] + 2 * $metrics['boundingBox']['x1'];
$textheight = $metrics['textHeight'] + $metrics['descender'];
$draw->annotation (0, $baseline, $text);
$im->newImage ($textwidth, $textheight, "white");
$im->drawImage ($draw);
$draw->clear ();
$im->writeImage ("test.png");
$im->clear ();
?>

The file test.png should now contain pretty much the complete text with no borders. This may not work for very unusual fonts, but will work OK for Times New Roman and Arial.
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1
jlong at carouselchecks dot com
1 year ago
Example output from queryFontMetrics:

Array
(
    [characterWidth] => 9
    [characterHeight] => 9
    [ascender] => 9
    [descender] => -2
    [textWidth] => 71
    [textHeight] => 10
    [maxHorizontalAdvance] => 12
    [boundingBox] => Array
        (
            [x1] => 0
            [y1] => -2
            [x2] => 6.890625
            [y2] => 7
        )

    [originX] => 70
    [originY] => 0
)
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0
abcrdw at gmail dot com
3 years ago
This script will print a watermark on the middle of an image. The width of the watermark will depend on the width of the image.

<?php
// Create a new Imagick object
$objImage = new Imagick( 'path/to/image.jpg' );

// Get the width and height of the image
$imgSize   = $objImage->getImageGeometry();
$imgWidth  = $imgSize['width'];
$imgHeight = $imgSize['height'];

// Create a new text object
$objText = new ImagickDraw();

// Set te text color
$objText->setFillColor( new ImagickPixel('grey') );

// Set the text transparency: 0 = transparent, 1 = opaque
$objText->setFillAlpha( 0.2 );

// Top left will be point of reference
$objText->setGravity( Imagick::GRAVITY_NORTHWEST );

// Create an array for the textwidth and textheight
$textProperties = array( 'textWidth' => 0 );

// Set the desired width of the watermark to 90% of the image width
$textDesiredWidth = intval( $imgWidth * 0.9 );

// Set an initial value for the fontsize, will be increased in the loop below
$fontSize = 0;

// We use the domain name of the server for the watermark text
$text = $_SERVER['SERVER_NAME'];

// Increase the fontsize until we have reached our desired width
while ( $textProperties['textWidth'] <= $textDesiredWidth ) {
   
$objText->setFontSize( $fontSize );
   
$textProperties = $objImage->queryFontMetrics( $objText, $text );
   
$fontSize++;
}

// Calculate the horizontal starting position
$watermarkPosX = intval( ($imgWidth - $textProperties['textWidth']) / 2 );

// Calculate the vertical starting position
$watermarkPosY = floor( ($imgHeight - $textProperties['textHeight']) / 2 );

// Composite the text on the image
$objImage->annotateImage( $objText, $watermarkPosX, $watermarkPosY, 0, $text );

// The browser must know this is JPEG image or else it will display garbled text
header( 'Content-Type: image/jpeg' );

// Display the image
echo $objImage;
?>
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0
thok nojunk at spammail thok dot ca
3 years ago
The following fields constitute my current PHP 5.2.1/Imagick 6.5.1 queryFontMetrics() return array (once setFontSize() and setFont() have been set):

characterWidth: maximum character ("em") width
characterHeight: maximum character height
ascender: the height of character ascensions (i.e. the straight bit on a 'b')
descender: the height of character descensions (i.e. the straight bit on a 'p')
textWidth: width of drawn text in pixels
textHeight: height of drawn text in pixels
maxHorizontalAdvance: maximum pixels from start of one character to start of the next
boundingBox: array of x1, y1, x2, y2 bounding borders
originX, originY: ?

originX seems to shadow the textWidth field, and originY has been zero thus far in my exploration.

If you're looking to center text or locate it at an edge, though, use ImagickDraw::setGravity(int $gravity), where $gravity is one of the following constants:

Imagick::GRAVITY_NORTHWEST
Imagick::GRAVITY_NORTH
Imagick::GRAVITY_NORTHEAST
Imagick::GRAVITY_WEST
Imagick::GRAVITY_CENTER
Imagick::GRAVITY_EAST
Imagick::GRAVITY_SOUTHWEST
Imagick::GRAVITY_SOUTH
Imagick::GRAVITY_SOUTHEAST

Using setGravity() is far less finicky for the simpler tasks.
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0
george at sogetthis dot com
4 years ago
Up to and including imagick 3.0.1, queryfontmetrics would output size data based on an image resolution of 72x72. (see bug: http://pecl.php.net/bugs/bug.php?id=19907)

Should you have set a resolution other than this and be using 3.0.1 or below, you need to scale measurements up by a factor of YOUR_RESOLUTION / 72

e.g. assuming you've set a resolution of 300
<?php
$im
= new Imagick();
$im->setResolution(300,300);

$draw = new ImagickDraw();
$draw->setFont('/path/to/arial.ttf');
$draw->setFontSize(72 * (300 / 72));
$data = $im->queryfontmetrics($draw, 'hello world');
var_dump($data);
?>

In 3.0.2 and above, the solution is to set the resolution on the draw object to that of the image resolution
<?php
$im
= new Imagick();
$im->setResolution(300,300);

$draw = new ImagickDraw();
$draw->setResolution(300,300);
$draw->setFont('/path/to/arial.ttf');
$draw->setFontSize(72);
$draw->setFillColor('#ff0000');
$data = $im->queryFontMetrics($draw, $string);

var_dump($data);
?>
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0
Pete &#39;the Pete&#39; de Pijd
5 years ago
You can also use $imagickDraw()->setTextAlignmnent(Imagick::ALIGN_CENTER) and $imagickDraw->annotation(..) instead.
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0
waage
6 years ago
You can use this to center a text within a box

<?php

$data
= "Hello world";

$text = new ImagickDraw();
$text->setFontSize(12);
$text->setFont("Arial");

$boxWidth = 210;

$im = new Imagick();

$fm = $im->queryFontMetrics($text, $data, false);

$textXLoc = ($boxWidth / 2) - ($fm["textWidth"] / 2);

?>

$textXLoc is now the starting location you need to use to feed to your annotateImage() function.
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