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ImagickDraw::setGravity

(PECL imagick 2.0.0)

ImagickDraw::setGravityテキストの配置時の gravity を設定する

説明

bool ImagickDraw::setGravity ( int $gravity )
警告

この関数は、 現在のところ詳細な情報はありません。引数のリストのみが 記述されています。

テキストによる注記を行う際に使用するテキスト配置の gravity を設定します。

パラメータ

gravity

GRAVITY_ 定数。

返り値

値を返しません。

例1 ImagickDraw::setGravity()

<?php
function setGravity($fillColor$strokeColor$backgroundColor) {

    
$draw = new \ImagickDraw();
    
$draw->setStrokeColor($strokeColor);
    
$draw->setFillColor($fillColor);
    
$draw->setStrokeWidth(1);
    
$draw->setFontSize(24);

    
$gravitySettings = array(
        \
Imagick::GRAVITY_NORTHWEST => 'NorthWest',
        \
Imagick::GRAVITY_NORTH => 'North',
        \
Imagick::GRAVITY_NORTHEAST => 'NorthEast',
        \
Imagick::GRAVITY_WEST => 'West',
        \
Imagick::GRAVITY_CENTER => 'Centre',
        \
Imagick::GRAVITY_SOUTHWEST => 'SouthWest',
        \
Imagick::GRAVITY_SOUTH => 'South',
        \
Imagick::GRAVITY_SOUTHEAST => 'SouthEast',
        \
Imagick::GRAVITY_EAST => 'East'
    
);

    
$draw->setFont("../fonts/Arial.ttf");

    foreach (
$gravitySettings as $type => $description) {
        
$draw->setGravity($type);
        
$draw->annotation(5050'"' $description '"');
    }

    
$imagick = new \Imagick();
    
$imagick->newImage(500500$backgroundColor);
    
$imagick->setImageFormat("png");
    
$imagick->drawImage($draw);

    
header("Content-Type: image/png");
    echo 
$imagick->getImageBlob();
}

?>

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User Contributed Notes 2 notes

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2
alan at ridersite dot org
10 years ago
Gravity constants are very useful as they can save having to calculate the placement of variable text strings and font sizes.

For example:
$draw->setGravity (Imagick::GRAVITY_CENTER);
$image->annotateImage($draw, 0, 0, 0, 'The quick brown fox jumps over the lazy dog');

Will horizontally and vertically center the text string.

Note, there are several gravity constants available. See, Constants — Imagick class constants
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0
bcre8ve at gmail dot com
4 years ago
It appears that the GRAVITY constants have an integer equivalent:
NORTHWEST = 1
NORTH = 2
NORTHEAST = 3
WEST = 4
CENTER = 5
EAST = 6
SOUTHWEST = 7
SOUTH = 8
SOUTHEAST = 9
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