The Imagick class
PHP Manual

Imagick::queryFontMetrics

(No version information available, might be only in CVS)

Imagick::queryFontMetrics — Returns an array representing the font metrics

Описание

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

К настоящему времени эта функция еще не была документирована; для ознакомления доступен только список аргументов.

Returns a multi-dimensional array representing the font metrics.

Список параметров

properties

ImagickDraw object containing font properties

text

The text

multiline

Multiline parameter. If left empty it is autodetected

Возвращаемые значения

Returns an array containing the formats supported by Imagick, throws ImagickException on error.

Errors/Exceptions

Throws ImagickException on error.

Примеры

Пример #1 Using Imagick::queryFontMetrics():

Query the metrics for the text and dump the results on the screen.

<?php
/* Create a new Imagick object */
$im = new Imagick();

/* Create an ImagickDraw object */
$draw = new ImagickDraw();

/* Set the font */
$draw->setFont('/path/to/font.ttf');

/* Dump the font metrics, autodetect multiline */
var_dump($im->queryFontMetrics($draw, "Hello World!"));
?>

Коментарии

Jan 30
Автор:
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.
2008-01-30 17:57:10
http://php5.kiev.ua/manual/ru/function.imagick-queryfontmetrics.html
Jun 29
Автор:
You can also use $imagickDraw()->setTextAlignmnent(Imagick::ALIGN_CENTER) and $imagickDraw->annotation(..) instead.
2009-06-29 16:18:50
http://php5.kiev.ua/manual/ru/function.imagick-queryfontmetrics.html
Nov 22
Автор:
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);
?>
2010-11-22 01:44:17
http://php5.kiev.ua/manual/ru/function.imagick-queryfontmetrics.html
Jan 03
Автор:
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.
2011-01-03 11:49:00
http://php5.kiev.ua/manual/ru/function.imagick-queryfontmetrics.html
Sep 18
Автор:
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;
?>
2011-09-18 20:49:24
http://php5.kiev.ua/manual/ru/function.imagick-queryfontmetrics.html
The Imagick class
PHP Manual
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