class Image {
??????? private $path;
//Construction method is used to initialize the location of the picture
function __construct($path="./"){
???????????????? $this->path=rtrim($path, "/")."/";
?????????}?
/* A shrinking of the picture
*
* Parameter $name: is the name of the image that needs to be processed
* Parameter $width: is the width after scaling
* Parameter $height: is the scaled height
* Parameter $qz: is the name prefix of the new picture
?????????????? * Return value: It is the name of the zoomed image, if it fails, it returns false
*
????????? */?
???????? function thumb($name, $width, $height, $qz="th_"){
//Get picture information
??????????????? $imgInfo=$this->getInfo($name); //Width, height, type of image
//Get image resources, resources can be created for various types of pictures jpg, gif, png
???????????????? $srcImg=$this->getImg($name, $imgInfo);
//Get the size of the image after calculating the equal proportions, $size["width"], $size["height"]
$size=$this->getNewSize($name, $width, $height, $imgInfo);
//Get new image resources and process the gif transparent background
??????????????? $newImg=$this->kidOfImage($srcImg, $size, $imgInfo);
//Save as a new image and return the new scaled image name
????????????????? return $this->createNewImage($newImg, $qz.$name, $imgInfo);????????????????????????????????? ?????????}?

???????? private function createNewImage($newImg, $newName, $imgInfo){
????????????? switch($imgInfo["type"]){
case 1://gif
???????????????????????? $result=imageGif($newImg, $this->path.$newName);
break;
case 2://jpg
????????????????????????? $result=imageJPEG($newImg, $this->path.$newName);
break;
case 3://png
??????????????????????????????? $return=imagepng($newImg, $this->path.$newName);
break;
????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? ????????????? imagedestroy($newImg);
?????????????? return $newName;
?????????}?

??????? private function kidOfImage($srcImg, $size, $imgInfo){?
??????????? $newImg=imagecreatetruecolor($size["width"], $size["height"]);?
?????????????
??????????? $otsc=imagecolortransparent($srcImg);?
?
??????????? if($otsc >=0 && $otsc <= imagecolorstotal($srcImg)){?
??????????????? $tran=imagecolorsforindex($srcImg, $otsc);?
?
??????????????? $newt=imagecolorallocate($newImg, $tran["red"], $tran["green"], $tran["blue"]);?
?
??????????????? imagefill($newImg, 0, 0, $newt);?
?
??????????????? imagecolortransparent($newImg, $newt);?
??????????? }?
?
??????????? imagecopyresized($newImg, $srcImg, 0, 0, 0, 0, $size["width"], $size["height"], $imgInfo["width"], $imgInfo["height"]);?
?
??????????? imagedestroy($srcImg);?
?
??????????? return $newImg;?
??????? }?
?
??????? private function getNewSize($name, $width, $height, $imgInfo){?
??????????? $size["width"]=$imgInfo["width"];?
??????????? $size["height"]=$imgInfo["height"];?
?
??????????? //縮放的寬度如果比原圖小才重新設(shè)置寬度??
??????????? if($width < $imgInfo["width"]){?
??????????????? $size["width"]=$width;?
??????????? }?
??????????? //縮放的高度如果比原圖小才重新設(shè)置高度??
??????????? if($height < $imgInfo["height"]){?
??????????????? $size["height"]=$height;?
??????????? }?
?
??????????? //圖片等比例縮放的算法??
??????????? if($imgInfo["width"]*$size["width"] > $imgInfo["height"] * $size["height"]){?
??????????????? $size["height"]=round($imgInfo["height"]*$size["width"]/$imgInfo["width"]);?
??????????? }else{?
??????????????? $size["width"]=round($imgInfo["width"]*$size["height"]/$imgInfo["height"]);?
??????????? }?
?
?
??????????? return $size;?
?
??????? }?
?
??????? private function getInfo($name){?
??????????? $data=getImageSize($this->path.$name);?
?
??????????? $imageInfo["width"]=$data[0];?
??????????? $imageInfo["height"]=$data[1];?
??????????? $imageInfo["type"]=$data[2];?
?
??????????? return $imageInfo;?
??????? }?
?
??????? private function getImg($name, $imgInfo){?
??????????? $srcPic=$this->path.$name;?
?
??????????? switch($imgInfo["type"]){?
??????????????? case 1: //gif??
??????????????????? $img=imagecreatefromgif($srcPic);?
??????????????????? break;?
??????????????? case 2: //jpg??
??????????????????? $img=imageCreatefromjpeg($srcPic);?
??????????????????? break;?
??????????????? case 3: //png??
??????????????????? $img=imageCreatefrompng($srcPic);?
??????????????????? break;?
??????????????? default:?
??????????????????? return false;?
?????????????????
??????????? }?
?
??????????? return $img;?
??????? }?
??????? /* 功能：為圖片加水印圖片
???????? * 參數(shù)$groundName: 背景圖片，即需要加水印的圖片
???????? * 參數(shù)$waterName: 水錢圖片
???????? * 參數(shù)#aterPost：水印位置， 10種狀態(tài)，?
???????? *? 0為隨機位置
???????? *
???????? *? 1. 為頂端居左? 2. 為頂端居中? 3 為頂端居右
???????? *? 4? 為中部居左? 5. 為中部居中? 6 為中部居右
???????? *? 7 . 為底端居左 8. 為底端居中， 9. 為底端居右
???????? *
???????? * 參數(shù)$qz : 是加水印后的圖片名稱前綴
???????? * 返回值：就是處理后圖片的名稱
???????? *
???????? */?
??????? function waterMark($groundName, $waterName, $waterPos=0, $qz="wa_"){?
?????????
??????????? if(file_exists($this->path.$groundName) && file_exists($this->path.$waterName)){?
??????????????? $groundInfo=$this->getInfo($groundName);?
??????????????? $waterInfo=$this->getInfo($waterName);?
??????????????? //水印的位置??
??????????????? if(!$pos=$this->position($groundInfo, $waterInfo, $waterPos)){?
??????????????????? echo "水印不應(yīng)該比背景圖片小！";?
??????????????????? return;?
??????????????? }?
?
??????????????? $groundImg=$this->getImg($groundName, $groundInfo);?
??????????????? $waterImg=$this->getImg($waterName, $waterInfo);?
?
??????????????? $groundImg=$this->copyImage($groundImg, $waterImg, $pos, $waterInfo);?
?
??????????????? return $this->createNewImage($groundImg, $qz.$groundName, $groundInfo);?
??????????? }else{?
??????????????? echo "圖片或水印圖片不存在";?
??????????????? return false;?
??????????? }?
??????? }?
?
??????? private function copyImage($groundImg, $waterImg, $pos, $waterInfo){?
??????????? imagecopy($groundImg, $waterImg, $pos["posX"], $pos["posY"], 0, 0, $waterInfo["width"], $waterInfo["height"]);?
??????????? imagedestroy($waterImg);?
?
??????????? return $groundImg;?
??????? }?
?????????
??????? private function position($groundInfo, $waterInfo, $waterPos){?
??????????? //需要背景比水印圖片大??
??????????? if(($groundInfo["width"]< $waterInfo["width"]) ||($groundInfo["height"] < $waterInfo["height"])){?
??????????????? return false;?
??????????? }?
?
??????????? switch($waterPos){?
??????????????? case 1:?
??????????????????? $posX=0;?
??????????????????? $posY=0;?
??????????????????? break;?
??????????????? case 2:?
??????????????????? $posX=($groundInfo["width"]-$waterInfo["width"])/2;?
??????????????????? $posY=0;?
??????????????????? break;?
??????????????? case 3:?
??????????????????? $posX=$groundInfo["width"]-$waterInfo["width"];?
??????????????????? $posY=0;?
??????????????????? break;?
??????????????? case 4:?
??????????????????? $posX=0;?
??????????????????? $posY=($groundInfo["height"]-$waterInfo["height"]) /2;?
??????????????????? break;?
??????????????? case 5:?
??????????????????? $posX=($groundInfo["width"]-$waterInfo["width"])/2;?
??????????????????? $posY=($groundInfo["height"]-$waterInfo["height"]) /2;?
??????????????????? break;?
??????????????? case 6:?
??????????????????? $posX=$groundInfo["width"]-$waterInfo["width"];?
??????????????????? $posY=($groundInfo["height"]-$waterInfo["height"]) /2;?
??????????????????? break;?
??????????????? case 7:?
??????????????????? $posX=0;?
??????????????????? $posY=$groundInfo["height"]-$waterInfo["height"];?
??????????????????? break;?
??????????????? case 8:?
??????????????????? $posX=($groundInfo["width"]-$waterInfo["width"])/2;?
??????????????????? $posY=$groundInfo["height"]-$waterInfo["height"];?
??????????????????? break;?
??????????????? case 9:?
??????????????????? $posX=$groundInfo["width"]-$waterInfo["width"];?
??????????????????? $posY=$groundInfo["height"]-$waterInfo["height"];?
??????????????????? break;?
??????????????? case 0:?
??????????????? default:?
??????????????????? $posX=rand(0, ($groundInfo["width"]-$waterInfo["width"]));?
??????????????????? $posY=rand(0, ($groundInfo["height"]-$waterInfo["height"]));?
??????????????????? break;?
??????????? }?
?
??????????? return array("posX"=>$posX, "posY"=>$posY);?
??????? }?
?
??? }?
?class Image {
??private $path;
??//構(gòu)造方法用來對圖片所在位置進行初使化
??function __construct($path="./"){
???$this->path=rtrim($path, "/")."/";
??}
??/* 對圖片進行縮放
?? *
* Parameter $name: is the name of the image that needs to be processed
* Parameter $width: is the width after scaling
* Parameter $height: is the scaled height
* Parameter $qz: is the name prefix of the new picture
* Return value: It is the name of the zoomed image. If it fails, it returns false
*
*/
function thumb($name, $width, $height, $qz="th_"){
//Get picture information
$imgInfo=$this->getInfo($name); //Width, height, type of image
//Get picture resources, you can create resources for various types of pictures jpg, gif, png
$srcImg=$this->getImg($name, $imgInfo);
//Get the size of the image after calculating the equal proportions, $size["width"], $size["height"]
$size=$this->getNewSize($name, $width, $height, $imgInfo);
//Get new image resources and process the gif transparent background
$newImg=$this->kidOfImage($srcImg, $size, $imgInfo);
//Save as a new picture and return the new scaled picture name
Return $this->createNewImage($newImg, $qz.$name, $imgInfo);
}

private function createNewImage($newImg, $newName, $imgInfo){
switch($imgInfo["type"]){
case 1://gif
$result=imageGif($newImg, $this->path.$newName);
Break;
case 2://jpg
$result=imageJPEG($newImg, $this->path.$newName);
Break;
case 3://png
$return=imagepng($newImg, $this->path.$newName);
Break;
}
Imagedestroy($newImg);
Return $newName;
}

private function kidOfImage($srcImg, $size, $imgInfo){
$newImg=imagecreatetruecolor($size["width"], $size["height"]);
?
$otsc=imagecolortransparent($srcImg);

if($otsc >=0 && $otsc <= imagecolorstotal($srcImg)){
$tran=imagecolorsforindex($srcImg, $otsc);

$newt=imagecolorallocate($newImg, $tran["red"], $tran["green"], $tran["blue"]);

imagefill($newImg, 0, 0, $newt);

imagecolortransparent($newImg, $newt);
}

imagecopyresized($newImg, $srcImg, 0, 0, 0, 0, $size["width"], $size["height"], $imgInfo["width"], $imgInfo["height"] );

imagedestroy($srcImg);

return $newImg;
}

private function getNewSize($name, $width, $height, $imgInfo){
$size["width"]=$imgInfo["width"];
$size["height"]=$imgInfo["height"];

//If the zoomed width is smaller than the original image, reset the width
if($width < $imgInfo["width"]){
$size["width"]=$width;
}
//If the zoomed height is smaller than the original image, reset the height
if($height < $imgInfo["height"]){
$size["height"]=$height;
}

//Algorithm for image scaling
if($imgInfo["width"]*$size["width"] > $imgInfo["height"] * $size["height"]){
$size["height"]=round($imgInfo["height"]*$size["width"]/$imgInfo["width"]);
}else{
$size["width"]=round($imgInfo["width"]*$size["height"]/$imgInfo["height"]);
}

Return $size;

}

private function getInfo($name){
$data=getImageSize($this->path.$name);

$imageInfo["width"]=$data[0];
$imageInfo["height"]=$data[1];
$imageInfo["type"]=$data[2];

return $imageInfo;
}

private function getImg($name, $imgInfo){
$srcPic=$this->path.$name;

switch($imgInfo["type"]){
Case 1: //gif
$img=imagecreatefromgif($srcPic);
Break;
Case 2: //jpg
$img=imageCreatefromjpeg($srcPic);
Break;
Case 3: //png
$img=imageCreatefrompng($srcPic);
Break;
Default:
Return false;
?
}

return $img;
}
/* Function: Add watermark to pictures
* Parameter $groundName: background image, that is, the image that needs to be watermarked
* Parameter $waterName: water money picture
* Parameter #aterPost: watermark position, 10 states,
* 0 is a random position
*
* 1. For top left 2. For top center 3 For top right
* 4 means the middle is on the left 5. means the middle is in the middle 6 means the middle is on the right
* 7. The bottom is on the left, 8. The bottom is in the middle, 9. The bottom is on the right
*
* Parameter $qz: is the watermarked image name prefix
* Return value: It is the name of the processed image
*
*/
function waterMark($groundName, $waterName, $waterPos=0, $qz="wa_"){

If(file_exists($this->path.$groundName) && file_exists($this->path.$waterName)){
$groundInfo=$this->getInfo($groundName);
$waterInfo=$this->getInfo($waterName);
//Position of watermark
If(!$pos=$this->position($groundInfo, $waterInfo, $waterPos)){
echo "The watermark should not be smaller than the background image!";
Return;
}

$groundImg=$this->getImg($groundName, $groundInfo);
$waterImg=$this->getImg($waterName, $waterInfo);

$groundImg=$this->copyImage($groundImg, $waterImg, $pos, $waterInfo);

return $this->createNewImage($groundImg, $qz.$groundName, $groundInfo);
}else{
echo "The picture or watermark image does not exist";
Return false;
}
}

private function copyImage($groundImg, $waterImg, $pos, $waterInfo){
Imagecopy($groundImg, $waterImg, $pos["posX"], $pos["posY"], 0, 0, $waterInfo["width"], $waterInfo["height"]);
Imagedestroy($waterImg);

return $groundImg;
}

Private function position($groundInfo, $waterInfo, $waterPos){
//The background needs to be larger than the watermark image
if(($groundInfo["width"]< $waterInfo["width"]) ||($groundInfo["height"] < $waterInfo["height"])){
Return false;
}

???switch($waterPos){
????case 1:
?????$posX=0;
?????$posY=0;
?????break;
????case 2:
?????$posX=($groundInfo["width"]-$waterInfo["width"])/2;
?????$posY=0;
?????break;
????case 3:
?????$posX=$groundInfo["width"]-$waterInfo["width"];
?????$posY=0;
?????break;
????case 4:
?????$posX=0;
?????$posY=($groundInfo["height"]-$waterInfo["height"]) /2;
?????break;
????case 5:
?????$posX=($groundInfo["width"]-$waterInfo["width"])/2;
?????$posY=($groundInfo["height"]-$waterInfo["height"]) /2;
?????break;
????case 6:
?????$posX=$groundInfo["width"]-$waterInfo["width"];
?????$posY=($groundInfo["height"]-$waterInfo["height"]) /2;
?????break;
????case 7:
?????$posX=0;
?????$posY=$groundInfo["height"]-$waterInfo["height"];
?????break;
????case 8:
?????$posX=($groundInfo["width"]-$waterInfo["width"])/2;
?????$posY=$groundInfo["height"]-$waterInfo["height"];
?????break;
????case 9:
?????$posX=$groundInfo["width"]-$waterInfo["width"];
?????$posY=$groundInfo["height"]-$waterInfo["height"];
?????break;
????case 0:
????default:
?????$posX=rand(0, ($groundInfo["width"]-$waterInfo["width"]));
?????$posY=rand(0, ($groundInfo["height"]-$waterInfo["height"]));
?????break;
???}

???return array("posX"=>$posX, "posY"=>$posY);
??}

?}

?摘自 chaojie2009的專欄