update : 2015.11.03
php.shukuma.com검색:
imagecolorallocatealpha
(PHP 4 >= 4.3.2, PHP 5, PHP 7)
imagecolorallocatealpha — Allocate a color for an image
설명
int imagecolorallocatealpha
( resource
$image
, int $red
, int $green
, int $blue
, int $alpha
)
imagecolorallocatealpha() behaves identically to
imagecolorallocate() with the addition of the transparency
parameter alpha.
인수
-
image -
imagecreatetruecolor() 등의 이미지 생성 함수에서 반환한 이미지 자원.
-
red -
Red 컴포넌트 값.
-
green -
Green 컴포넌트 값.
-
blue -
Blue 컴포넌트 값.
-
alpha -
A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.
red, green
and blue parameters are integers
between 0 and 255 or hexadecimals between 0x00 and 0xFF.
반환값
A color identifier or FALSE if the allocation failed.
변경점
| 버전 | 설명 |
|---|---|
| 5.1.3 |
Returns FALSE if the allocation failed. Previously
-1 was returned.
|
예제
Example #1 Example of using imagecolorallocatealpha()
<?php
$size = 300;
$image=imagecreatetruecolor($size, $size);
// something to get a white background with black border
$back = imagecolorallocate($image, 255, 255, 255);
$border = imagecolorallocate($image, 0, 0, 0);
imagefilledrectangle($image, 0, 0, $size - 1, $size - 1, $back);
imagerectangle($image, 0, 0, $size - 1, $size - 1, $border);
$yellow_x = 100;
$yellow_y = 75;
$red_x = 120;
$red_y = 165;
$blue_x = 187;
$blue_y = 125;
$radius = 150;
// allocate colors with alpha values
$yellow = imagecolorallocatealpha($image, 255, 255, 0, 75);
$red = imagecolorallocatealpha($image, 255, 0, 0, 75);
$blue = imagecolorallocatealpha($image, 0, 0, 255, 75);
// drawing 3 overlapped circle
imagefilledellipse($image, $yellow_x, $yellow_y, $radius, $radius, $yellow);
imagefilledellipse($image, $red_x, $red_y, $radius, $radius, $red);
imagefilledellipse($image, $blue_x, $blue_y, $radius, $radius, $blue);
// don't forget to output a correct header!
header('Content-Type: image/png');
// and finally, output the result
imagepng($image);
imagedestroy($image);
?>
위 예제의 출력 예시:
주의
Note: 이 함수는 GD 2.0.1 이후 버전이 필요합니다. (2.0.28 이후를 권장합니다)
참고
- imagecolorallocate() - Allocate a color for an image
- imagecolordeallocate() - De-allocate a color for an image