Very useful to build a pseudo-sphere with a color gradient...
<?php
$width = 300;
$center = $width / 2;
$colordivs = 255 / $center;
$im = @imagecreate($width, $width);
$back_color = imagecolorallocate($im, 20, 30, 40);
imagefill($im, 0, 0, $back_color);
for ($i = 0; $i <= $center; $i++)
{
$diametre = $width - 2 * $i;
$el_color = imagecolorallocate($im, $i * $colordivs, 0, 0);
imagearc($im, $center, $center, $diametre, $diametre, 0, 360, $el_color);
imagefilltoborder($im, $center, $center, $el_color, $el_color);
}
imagepng($im);
?>
Dark Skull Software
http://www.darkskull.net
imagefilltoborder
(PHP 4, PHP 5, PHP 7)
imagefilltoborder — Flood fill to specific color
설명
bool imagefilltoborder
( resource
$image
, int $x
, int $y
, int $border
, int $color
)
imagefilltoborder() performs a flood fill
whose border color is defined by border.
The starting point for the fill is x,
y (top left is 0, 0) and the region is
filled with color color.
인수
-
image -
imagecreatetruecolor() 등의 이미지 생성 함수에서 반환한 이미지 자원.
-
x -
x-coordinate of start.
-
y -
y-coordinate of start.
-
border -
The border color. A color identifier created with imagecolorallocate().
-
color -
The fill color. A color identifier created with imagecolorallocate().
반환값
성공 시 TRUE를, 실패 시 FALSE를 반환합니다.
예제
Example #1 Filling an ellipse with a color
<?php
// Create the image handle, set the background to white
$im = imagecreatetruecolor(100, 100);
imagefilledrectangle($im, 0, 0, 100, 100, imagecolorallocate($im, 255, 255, 255));
// Draw an ellipse to fill with a black border
imageellipse($im, 50, 50, 50, 50, imagecolorallocate($im, 0, 0, 0));
// Set the border and fill colors
$border = imagecolorallocate($im, 0, 0, 0);
$fill = imagecolorallocate($im, 255, 0, 0);
// Fill the selection
imagefilltoborder($im, 50, 50, $border, $fill);
// Output and free memory
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>
위 예제의 출력 예시:
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User Contributed Notes 2 notes
edrad at wanadoo dot fr ¶
21 years ago
admin at worldlanguages dot tk ¶
20 years ago
In the example below, for those with newer GD versions, it makes more sense to replace:
imagearc($im, $center, $center, $diametre, $diametre, 0, 360, $el_color);
with:
imageellipse($im, $center, $center, $diametre, $diametre, $el_color);
This is obviously simpler.
