* @createTime: 2018/6/7 15:39
* @version 1.0.0
*/
/**
* 获取圆形头像
* @param string $url 头像地址
* @param int $size 尺寸
* @return resource
* @author wangyu
* @createTime 2018/6/7 15:37
*/
function getCircleAvatar($url, $size = 128)
{
$original_string = file_get_contents($url);
$avatarResource = imagecreatefromstring($original_string);
/*$imageSize = getimagesizefromstring($original_string);
$width = $imageSize[0];
$height = $imageSize[1];*/
$width = imagesx($avatarResource);
$height = imagesy($avatarResource);
$w = $h = $size;
$squareAvatarResource = imageCenterCrop($avatarResource, $w, $h, $width, $height);
$newAvatarResource = imagecreatetruecolor($w, $h);
imagealphablending($newAvatarResource, false);
$transparent = imagecolorallocatealpha($newAvatarResource, 0, 0, 0, 127);
$r = $w / 2;
for ($x = 0; $x < $w; $x++) {
for ($y = 0; $y < $h; $y++) {
$c = imagecolorat($squareAvatarResource, $x, $y);
$_x = $x - $w / 2;
$_y = $y - $h / 2;
if ((($_x * $_x) + ($_y * $_y)) < ($r * $r)) {
imagesetpixel($newAvatarResource, $x, $y, $c);
} else {
imagesetpixel($newAvatarResource, $x, $y, $transparent);
}
}
}
imagesavealpha($newAvatarResource, true);
imagedestroy($squareAvatarResource);
/*imagepng($newAvatarResource);
imagedestroy($newAvatarResource);*/
return $newAvatarResource;
}
/**
* 图像居中裁剪
* @param resource $originalImageObj 原始头像资源对象
* @param int $width 要裁剪的宽度
* @param int $height 要裁剪的高度
* @param int $w 原始图像宽度
* @param int $h 原始图像高度
* @return resource
* @author wangyu
* @createTime 2018/6/7 15:29
*/
function imageCenterCrop($originalImageObj, $width, $height, $w, $h)
{
$scale = max($width / $w, $height / $h); //计算缩放比例
//设置缩略图的坐标及宽度和高度
$w1 = $width / $scale;
$h1 = $height / $scale;
$x = ($w - $w1) / 2;
$y = ($h - $h1) / 2;
$img = imagecreatetruecolor($width, $height);
//调整默认颜色
$color = imagecolorallocate($img, 255, 255, 255);
imagefill($img, 0, 0, $color);
//裁剪
imagecopyresampled($img, $originalImageObj, 0, 0, $x, $y, $width, $height, $w1, $h1);
imagedestroy($originalImageObj);
return $img;
}
/**
* 处理圆角图片
* @param resource $im 图像资源对象
* @param int $radius 圆角半径 长度默认为15，处理成圆型
* @return resource
* @author wangyu
* @createTime 2018/8/15 8:42
*/
function imageRadius($im, int $radius = 15)
{
$w = imagesx($im);
$h = imagesy($im);
// $radius = $radius == 0 ? (min($w, $h) / 2) : $radius;
$img = imagecreatetruecolor($w, $h);
imagesavealpha($img, true);
$bg = imagecolorallocatealpha($img, 255, 255, 255, 127); //拾取一个完全透明的颜色,最后一个参数127为全透明
imagefill($img, 0, 0, $bg);
$r = $radius; //圆角半径
for ($x = 0; $x < $w; $x++) {
for ($y = 0; $y < $h; $y++) {
$rgbColor = imagecolorat($im, $x, $y);
if (($x >= $radius && $x <= ($w - $radius)) || ($y >= $radius && $y <= ($h - $radius))) {
//不在四角的范围内,直接画
imagesetpixel($img, $x, $y, $rgbColor);
} else {
//在四角的范围内选择画
//上左
$y_x = $r; //圆心X坐标
$y_y = $r; //圆心Y坐标
if (((($x - $y_x) * ($x - $y_x) + ($y - $y_y) * ($y - $y_y)) <= ($r * $r))) {
imagesetpixel($img, $x, $y, $rgbColor);
}
//上右
$y_x = $w - $r; //圆心X坐标
$y_y = $r; //圆心Y坐标
if (((($x - $y_x) * ($x - $y_x) + ($y - $y_y) * ($y - $y_y)) <= ($r * $r))) {
imagesetpixel($img, $x, $y, $rgbColor);
}
//下左
$y_x = $r; //圆心X坐标
$y_y = $h - $r; //圆心Y坐标
if (((($x - $y_x) * ($x - $y_x) + ($y - $y_y) * ($y - $y_y)) <= ($r * $r))) {
imagesetpixel($img, $x, $y, $rgbColor);
}
//下右
$y_x = $w - $r; //圆心X坐标
$y_y = $h - $r; //圆心Y坐标
if (((($x - $y_x) * ($x - $y_x) + ($y - $y_y) * ($y - $y_y)) <= ($r * $r))) {
imagesetpixel($img, $x, $y, $rgbColor);
}
}
}
}
return $img;
}
