1 <?php 2 3 class ImageTool { 4 5 //以宽为标准，如果小于宽，则不剪裁 6 public static function thumb_img_by_width($src_path, $dest_path,$width,$height){ 7 8 $info_arr = getimagesize($src_path); 9 $src_width = $info_arr[0]; 10 $src_height = $info_arr[1]; 11 12 switch( $info_arr['mime'] ) { 13 case 'image/gif': 14 $src_img = imagecreatefromgif( $src_path ); 15 break; 16 case 'image/jpeg': 17 $src_img = imagecreatefromjpeg( $src_path ); 18 break; 19 case 'image/png': 20 $src_img = imagecreatefrompng( $src_path ); 21 break; 22 } 23 24 if($src_width > $width){ 25 //裁剪 26 // 改变后的图象的比例 27 $resize_ratio = ($width) / ($height); 28 // 实际图象的比例 29 $ratio = ($src_width) / ($src_height); 30 31 if ($ratio >= $resize_ratio) { 32 // 高度优先 33 //截取图片中间那一段 34 $img_center_x = intval(($src_width-($src_height * $resize_ratio))/2); 35 //如果不需要只截取中间那一段，而是从图片x＝0的地方截取，则$img_center_x=0 36 $newimg = @imagecreatetruecolor($width, $height); 37 $color = imagecolorallocate($newimg,255,255,255); 38 imagecolortransparent($newimg,$color); 39 imagefill($newimg,0,0,$color); 40 @imagecopyresampled($newimg, $src_img, 0, 0, $img_center_x, 0, $width, $height, (($src_height) * $resize_ratio), $src_height); 41 // ImageJpeg($newimg); 42 }else{ 43 // 宽度优先 44 //截取图片中间那一段 45 $img_center_y = intval(($src_height-($src_width / $resize_ratio))/2); 46 //如果不需要只截取中间那一段，而是从图片y＝0的地方截取，则$img_center_y=0 47 $newimg = @imagecreatetruecolor($width, $height); 48 $color = imagecolorallocate($newimg,255,255,255); 49 imagecolortransparent($newimg,$color); 50 imagefill($newimg,0,0,$color); 51 @imagecopyresampled($newimg, $src_img, 0, 0, 0, $img_center_y, $width, $height, $src_width, (($src_width) / $resize_ratio)); 52 } 53 }else{ 54 //不裁剪 55 $newimg = @imagecreatetruecolor($src_width, $src_height); 56 $color = imagecolorallocate($newimg,255,255,255); 57 imagecolortransparent($newimg,$color); 58 imagefill($newimg,0,0,$color); 59 @imagecopyresampled($newimg, $src_img, 0, 0, 0, 0, $src_width, $src_height, $src_width, $src_height); 60 } 61 62 //统一保存为png格式 63 imagepng($newimg, $dest_path); 64 65 //gc 66 imagedestroy($src_img); 67 imagedestroy($newimg); 68 } 69 70 public static function thumb_img($src_path, $dest_path,$width,$height){ 71 72 $info_arr = getimagesize($src_path); 73 $src_width = $info_arr[0]; 74 $src_height = $info_arr[1]; 75 76 switch( $info_arr['mime'] ) { 77 case 'image/gif': 78 $src_img = imagecreatefromgif( $src_path ); 79 break; 80 case 'image/jpeg': 81 $src_img = imagecreatefromjpeg( $src_path ); 82 break; 83 case 'image/png': 84 $src_img = imagecreatefrompng( $src_path ); 85 break; 86 } 87 88 // 改变后的图象的比例 89 $resize_ratio = ($width) / ($height); 90 // 实际图象的比例 91 $ratio = ($src_width) / ($src_height); 92 93 if ($ratio >= $resize_ratio) { 94 // 高度优先 95 //截取图片中间那一段 96 $img_center_x = intval(($src_width-($src_height * $resize_ratio))/2); 97 //如果不需要只截取中间那一段，而是从图片x＝0的地方截取，则$img_center_x=0 98 $newimg = @imagecreatetruecolor($width, $height); 99 $color = imagecolorallocate($newimg,255,255,255); 100 imagecolortransparent($newimg,$color); 101 imagefill($newimg,0,0,$color); 102 @imagecopyresampled($newimg, $src_img, 0, 0, $img_center_x, 0, $width, $height, (($src_height) * $resize_ratio), $src_height); 103 // ImageJpeg($newimg); 104 }else{ 105 // 宽度优先 106 //截取图片中间那一段 107 $img_center_y = intval(($src_height-($src_width / $resize_ratio))/2); 108 //如果不需要只截取中间那一段，而是从图片y＝0的地方截取，则$img_center_y=0 109 $newimg = @imagecreatetruecolor($width, $height); 110 $color = imagecolorallocate($newimg,255,255,255); 111 imagecolortransparent($newimg,$color); 112 imagefill($newimg,0,0,$color); 113 @imagecopyresampled($newimg, $src_img, 0, 0, 0, $img_center_y, $width, $height, $src_width, (($src_width) / $resize_ratio)); 114 } 115 116 //统一保存为png格式 117 imagepng($newimg, $dest_path); 118 119 //gc 120 imagedestroy($src_img); 121 imagedestroy($newimg); 122 } 123 124 /* 125 * 按比例缩放图片，然后居中裁剪 126 * $src_path 源文件路劲 127 * $dest_path 裁剪图片存放位置 128 * $width 裁剪图片宽带 129 * $height 裁剪图片高度 130 */ 131 public static function clip_img($src_path, $dest_path, $width, $height) { 132 if( file_exists($src_path) ) { 133 $info_arr = getimagesize($src_path); 134 $src_width = $info_arr[0]; 135 $src_height = $info_arr[1]; 136 $src_ratio = $src_height / $src_width; 137 $dest_ratio = $height / $width; 138 139 if( $src_ratio < $dest_ratio ) { 140 $ratio_width = $width; 141 $ratio_height = ( $height * $src_height ) / $src_width; 142 }else if( $src_ratio > $dest_ratio ) { 143 $ratio_height = $height; 144 $ratio_width = ( $width * $src_width ) / $src_height; 145 }else { 146 $ratio_height = $height; 147 $ratio_width = $width; 148 } 149 150 switch( $info_arr['mime'] ) { 151 case 'image/gif': 152 $src_img = imagecreatefromgif( $src_path ); 153 break; 154 case 'image/jpeg': 155 $src_img = imagecreatefromjpeg( $src_path ); 156 break; 157 case 'image/png': 158 $src_img = imagecreatefrompng( $src_path ); 159 break; 160 case 'image/bmp': 161 //待处理 162 break; 163 } 164 165 //等比例缩放图片 166 $thumb_img = imagecreatetruecolor( intval($ratio_width), intval($ratio_height) ) ; 167 $color = imagecolorallocate($thumb_img,255,255,255); 168 imagecolortransparent($thumb_img,$color); 169 imagefill($thumb_img,0,0,$color); 170 imagecopyresampled( $thumb_img, $src_img, 0, 0, 0, 0, $ratio_width, $ratio_height, $src_width, $src_height); 171 172 //剪裁 173 $clip_img = imagecreatetruecolor( intval($width), intval($height) ); 174 imagecopy( $clip_img, $thumb_img, 0, 0, ( $ratio_width - $width ) / 2, ( $ratio_height - $height ) / 2, $width, $height ); 175 176 //统一保存为png格式 177 imagepng($clip_img, $dest_path); 178 179 //gc 180 imagedestroy($src_img); 181 imagedestroy($thumb_img); 182 imagedestroy($clip_img); 183 } 184 } 185 186 /* 187 * 按比例缩放图片 188 * type = 1 按宽为标准缩放 2 按高为标准缩放 189 */ 190 public static function scale_img($src_path,$dest_path,$type,$len){ 191 if( file_exists($src_path) ){ 192 $info_arr = getimagesize($src_path); 193 $src_width = $info_arr[0]; 194 $src_height = $info_arr[1]; 195 if($type == 1){ 196 $des_width = $len; 197 $des_height = ( $src_height * $des_width ) / $src_width; 198 }else{ 199 $des_height = $len; 200 $des_width = ( $src_width * $des_height ) / $src_height; 201 } 202 203 switch( $info_arr['mime'] ) { 204 case 'image/gif': 205 $src_img = imagecreatefromgif( $src_path ); 206 break; 207 case 'image/jpeg': 208 $src_img = imagecreatefromjpeg( $src_path ); 209 break; 210 case 'image/png': 211 $src_img = imagecreatefrompng( $src_path ); 212 break; 213 case 'image/bmp': 214 //待处理 215 break; 216 } 217 218 $thumb_img = imagecreatetruecolor( intval($des_width), intval($des_height) ); 219 $color = imagecolorallocate($thumb_img,255,255,255); 220 imagecolortransparent($thumb_img,$color); 221 imagefill($thumb_img,0,0,$color); 222 imagecopyresampled( $thumb_img, $src_img, 0, 0, 0, 0, $des_width, $des_height, $src_width, $src_height); 223 224 225 //统一保存为png格式 226 imagepng($thumb_img, $dest_path); 227 228 //gc 229 imagedestroy($src_img); 230 imagedestroy($thumb_img); 231 } 232 } 233 234 }