ImagickDraw::setGravity

(PECL imagick 2, PECL imagick 3)

ImagickDraw::setGravity — Sets the text placement gravity

说明

public ImagickDraw::setGravity(int $gravity): bool

警告

本函数还未编写文档，仅有参数列表。

Sets the text placement gravity to use when annotating with text.

参数

gravity: One of the GRAVITY constant (imagick::GRAVITY_*).

返回值

没有返回值。

示例

示例 #1 ImagickDraw::setGravity() example

<?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(50, 50, '"' . $description . '"');
    }

$imagick = new \Imagick();
$imagick->newImage(500, 500, $backgroundColor);
$imagick->setImageFormat("png");
$imagick->drawImage($draw);

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

?>

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alan at ridersite dot org ¶

17 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

down

-2

bcre8ve at gmail dot com ¶

11 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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官方地址：https://www.php.net/manual/en/imagickdraw.setgravity.php

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ImagickDraw::setGravity

说明

参数

返回值

示例

发现了问题？

用户贡献的备注 2 notes