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
ImagickDraw::setGravity
(PECL imagick 2.0.0)
ImagickDraw::setGravity — Sets the text placement gravity
說明
bool ImagickDraw::setGravity
( int
$gravity
)Warning
此函式目前沒有參考文件；只有引數列表。
Sets the text placement gravity to use when annotating with text.
參數
-
gravity -
GRAVITY_ constant
回傳值
無回傳值。
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User Contributed Notes 2 notes
alan at ridersite dot org ¶
16 years ago
bcre8ve at gmail dot com ¶
10 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
