imagefilltoborder()
(PHP 4, PHP 5, PHP 7)
区域填充到指定颜色的边界为止
说明
imagefilltoborder(resource $image,int $x,int $y,int $border,int $color): bool
imagefilltoborder()从$x,$y(图像左上角为 0, 0)点开始用$color颜色执行区域填充,直到碰到颜色为$border的边界为止。【注:边界内的所有颜色都会被填充。如果指定的边界色和该点颜色相同,则没有填充。如果图像中没有该边界色,则整幅图像都会被填充。】
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
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.