<?php
class ImageTool {
//以宽为标准，如果小于宽，则不剪裁
public static function thumb_img_by_width($src_path, $dest_path,$width,$height){
$info_arr = getimagesize($src_path);
$src_width = $info_arr[0];
$src_height = $info_arr[1];
switch( $info_arr['mime'] ) {
case 'image/gif':
$src_img = imagecreatefromgif( $src_path );
break;
case 'image/jpeg':
$src_img = imagecreatefromjpeg( $src_path );
break;
case 'image/png':
$src_img = imagecreatefrompng( $src_path );
break;
}
if($src_width > $width){
//裁剪
// 改变后的图象的比例
$resize_ratio = ($width) / ($height);
// 实际图象的比例
$ratio = ($src_width) / ($src_height);
if ($ratio >= $resize_ratio) {
// 高度优先
//截取图片中间那一段
$img_center_x = intval(($src_width-($src_height * $resize_ratio))/2);
//如果不需要只截取中间那一段，而是从图片x＝0的地方截取，则$img_center_x=0
$newimg = @imagecreatetruecolor($width, $height);
$color = imagecolorallocate($newimg,255,255,255);
imagecolortransparent($newimg,$color);
imagefill($newimg,0,0,$color);
@imagecopyresampled($newimg, $src_img, 0, 0, $img_center_x, 0, $width, $height, (($src_height) * $resize_ratio), $src_height);
// ImageJpeg($newimg);
}else{
// 宽度优先
//截取图片中间那一段
$img_center_y = intval(($src_height-($src_width / $resize_ratio))/2);
//如果不需要只截取中间那一段，而是从图片y＝0的地方截取，则$img_center_y=0
$newimg = @imagecreatetruecolor($width, $height);
$color = imagecolorallocate($newimg,255,255,255);
imagecolortransparent($newimg,$color);
imagefill($newimg,0,0,$color);
@imagecopyresampled($newimg, $src_img, 0, 0, 0, $img_center_y, $width, $height, $src_width, (($src_width) / $resize_ratio));
}
}else{
//不裁剪
$newimg = @imagecreatetruecolor($src_width, $src_height);
$color = imagecolorallocate($newimg,255,255,255);
imagecolortransparent($newimg,$color);
imagefill($newimg,0,0,$color);
@imagecopyresampled($newimg, $src_img, 0, 0, 0, 0, $src_width, $src_height, $src_width, $src_height);
}
//统一保存为png格式
imagepng($newimg, $dest_path);
//gc
imagedestroy($src_img);
imagedestroy($newimg);
}
public static function thumb_img($src_path, $dest_path,$width,$height){
$info_arr = getimagesize($src_path);
$src_width = $info_arr[0];
$src_height = $info_arr[1];
switch( $info_arr['mime'] ) {
case 'image/gif':
$src_img = imagecreatefromgif( $src_path );
break;
case 'image/jpeg':
$src_img = imagecreatefromjpeg( $src_path );
break;
case 'image/png':
$src_img = imagecreatefrompng( $src_path );
break;
}
// 改变后的图象的比例
$resize_ratio = ($width) / ($height);
// 实际图象的比例
$ratio = ($src_width) / ($src_height);
if ($ratio >= $resize_ratio) {
// 高度优先
//截取图片中间那一段
$img_center_x = intval(($src_width-($src_height * $resize_ratio))/2);
//如果不需要只截取中间那一段，而是从图片x＝0的地方截取，则$img_center_x=0
$newimg = @imagecreatetruecolor($width, $height);
$color = imagecolorallocate($newimg,255,255,255);
imagecolortransparent($newimg,$color);
imagefill($newimg,0,0,$color);
@imagecopyresampled($newimg, $src_img, 0, 0, $img_center_x, 0, $width, $height, (($src_height) * $resize_ratio), $src_height);
// ImageJpeg($newimg);
}else{
// 宽度优先
//截取图片中间那一段
$img_center_y = intval(($src_height-($src_width / $resize_ratio))/2);
//如果不需要只截取中间那一段，而是从图片y＝0的地方截取，则$img_center_y=0
$newimg = @imagecreatetruecolor($width, $height);
$color = imagecolorallocate($newimg,255,255,255);
imagecolortransparent($newimg,$color);
imagefill($newimg,0,0,$color);
@imagecopyresampled($newimg, $src_img, 0, 0, 0, $img_center_y, $width, $height, $src_width, (($src_width) / $resize_ratio));
}
//统一保存为png格式
imagepng($newimg, $dest_path);
//gc
imagedestroy($src_img);
imagedestroy($newimg);
}
/*
* 按比例缩放图片，然后居中裁剪
* $src_path 源文件路劲
* $dest_path 裁剪图片存放位置
* $width 裁剪图片宽带
* $height 裁剪图片高度
*/
public static function clip_img($src_path, $dest_path, $width, $height) {
if( file_exists($src_path) ) {
$info_arr = getimagesize($src_path);
$src_width = $info_arr[0];
$src_height = $info_arr[1];
$src_ratio = $src_height / $src_width;
$dest_ratio = $height / $width;
if( $src_ratio < $dest_ratio ) {
$ratio_width = $width;
$ratio_height = ( $height * $src_height ) / $src_width;
}else if( $src_ratio > $dest_ratio ) {
$ratio_height = $height;
$ratio_width = ( $width * $src_width ) / $src_height;
}else {
$ratio_height = $height;
$ratio_width = $width;
}
switch( $info_arr['mime'] ) {
case 'image/gif':
$src_img = imagecreatefromgif( $src_path );
break;
case 'image/jpeg':
$src_img = imagecreatefromjpeg( $src_path );
break;
case 'image/png':
$src_img = imagecreatefrompng( $src_path );
break;
case 'image/bmp':
//待处理
break;
}
//等比例缩放图片
$thumb_img = imagecreatetruecolor( intval($ratio_width), intval($ratio_height) ) ;
$color = imagecolorallocate($thumb_img,255,255,255);
imagecolortransparent($thumb_img,$color);
imagefill($thumb_img,0,0,$color);
imagecopyresampled( $thumb_img, $src_img, 0, 0, 0, 0, $ratio_width, $ratio_height, $src_width, $src_height);
//剪裁
$clip_img = imagecreatetruecolor( intval($width), intval($height) );
imagecopy( $clip_img, $thumb_img, 0, 0, ( $ratio_width - $width ) / 2, ( $ratio_height - $height ) / 2, $width, $height );
//统一保存为png格式
imagepng($clip_img, $dest_path);
//gc
imagedestroy($src_img);
imagedestroy($thumb_img);
imagedestroy($clip_img);
}
}
/*
* 按比例缩放图片
* type = 1 按宽为标准缩放 2 按高为标准缩放
*/
public static function scale_img($src_path,$dest_path,$type,$len){
if( file_exists($src_path) ){
$info_arr = getimagesize($src_path);
$src_width = $info_arr[0];
$src_height = $info_arr[1];
if($type == 1){
$des_width = $len;
$des_height = ( $src_height * $des_width ) / $src_width;
}else{
$des_height = $len;
$des_width = ( $src_width * $des_height ) / $src_height;
}
switch( $info_arr['mime'] ) {
case 'image/gif':
$src_img = imagecreatefromgif( $src_path );
break;
case 'image/jpeg':
$src_img = imagecreatefromjpeg( $src_path );
break;
case 'image/png':
$src_img = imagecreatefrompng( $src_path );
break;
case 'image/bmp':
//待处理
break;
}
$thumb_img = imagecreatetruecolor( intval($des_width), intval($des_height) );
$color = imagecolorallocate($thumb_img,255,255,255);
imagecolortransparent($thumb_img,$color);
imagefill($thumb_img,0,0,$color);
imagecopyresampled( $thumb_img, $src_img, 0, 0, 0, 0, $des_width, $des_height, $src_width, $src_height);
//统一保存为png格式
imagepng($thumb_img, $dest_path);
//gc
imagedestroy($src_img);
imagedestroy($thumb_img);
}
}
}