php GD 圆图 -处理成圆图片
1 <?php 2 /** 3 * 处理成圆图片,如果图片不是正方形就取最小边的圆半径,从左边开始剪切成圆形 4 * @param string $imgpath [description] 5 * @return [type] [description] 6 */ 7 function yuan_img($imgpath = './code_png/share.jpg') { 8 $ext = pathinfo($imgpath); 9 $src_img = null; 10 switch ($ext['extension']) { 11 case 'jpg': 12 $src_img = imagecreatefromjpeg($imgpath); 13 break; 14 case 'png': 15 $src_img = imagecreatefrompng($imgpath); 16 break; 17 } 18 $wh = getimagesize($imgpath); 19 $w = $wh[0]; 20 $h = $wh[1]; 21 $w = min($w, $h); 22 $h = $w; 23 $img = imagecreatetruecolor($w, $h); 24 //这一句一定要有 25 imagesavealpha($img, true); 26 //拾取一个完全透明的颜色,最后一个参数127为全透明 27 $bg = imagecolorallocatealpha($img, 255, 255, 255, 127); 28 imagefill($img, 0, 0, $bg); 29 $r = $w / 2; //圆半径 30 $y_x = $r; //圆心X坐标 31 $y_y = $r; //圆心Y坐标 32 for ($x = 0; $x < $w; $x++) { 33 for ($y = 0; $y < $h; $y++) { 34 $rgbColor = imagecolorat($src_img, $x, $y); 35 if (((($x - $r) * ($x - $r) + ($y - $r) * ($y - $r)) < ($r * $r))) { 36 imagesetpixel($img, $x, $y, $rgbColor); 37 } 38 } 39 } 40 41 return $img; 42 } 43 44 Header("Content-Type: image/png");
$img = yuan_img();
45 imagepng($img);
46 imagedestroy($img);
如果本文章已帮助到您!