


PHP generates watermark, including position and transparency_PHP tutorial
/*
Recommend it to everyone! It mainly includes image cropping, scaling, watermarking, etc. Here are some simple ways to use it.
include("imageclass.php"); //Pay attention to the path of imageclass.php here
$imgs=new image();
$imgs->param($tempFile);
if(!$imgs->thumb($targetFile,600,500))die('--Image upload failed!'); //Zoom the image
$imgs->water($targetFile,$water,$pos=0,$pct=50); mainly includes two parameters, $targetFile is the file path that has been uploaded to the server, $water is the watermark image, $pos is Watermark image position, $pct is transparency;
$pos location description:
0://random
1://1 is the top left
2://2 is top and center
3://3 means top right
4://4 means the center is on the left
5://5 is centered in the middle
6://6 means the center is on the right
7://7 means the bottom is on the left
8://8 is bottom-centered
9://9 means the bottom is on the right
Save the contents of // in imageclass.php and you can call it.
////////////////////////////////////////////////////// /////////////
*/
?>
/* +-------------------------------------------------- ---------------+
* | Copyright (c) 2008-2009 Diqiye.Com All rights reserved.
* +------------------------------------------------ -------------+
* | Info: Image processing class
* +------------------------------------------------ -------------+
*/
class image {
// The current picture
protected $img; // Image type correspondence table
protected $types = array(
1 = & gt; 'gif',
2 = & gt; 'jpg',
3 = & gt; 'png',
6 = & gt; 'BMP'
);
// image
public function __construct($img=''){
!$img && $this->param($img);
}
// Info
public function param($img){
$this->img = $img;
return $this;
}
// imageInfo
public function getImageInfo($img){
$info = @getimagesize($img);
If(isset($this->types[$info[2]])){
$info['ext'] = $info['type'] = $this->types[$info[2]];
} else{
$info['ext'] = $info['type'] = 'jpg';
}
$info['type'] == 'jpg' && $info['type'] = 'jpeg';
$info['size'] = @filesize($img);
return $info;
}
// thumb(new image address, width, height, crop, allow zooming in)
Public function thumb($filename,$new_w=160,$new_h=120,$cut=0,$big=0){
// Get original image information
$info = $this->getImageInfo($this->img);
If(!empty($info[0])) {
$old_w = $info[0];
$old_h = $info[1];
$type = $info['type'];
$ext = $info['ext'];
unset($info);
// If the original image is smaller than the thumbnail and no enlargement is allowed
If($old_w
return false;
}
if($cut == 0){ // Equiproportional sequence
$scale = min($new_w/$old_w, $new_h/$old_h); // Calculate the scaling ratio
$width = (int)($old_w*$scale); // Thumbnail size
$height = (int)($old_h*$scale);
$start_w = $start_h = 0;
$end_w = $old_w;
$end_h = $old_h;
} elseif($cut == 1){ // center center crop
$scale1 = round($new_w/$new_h,2);
$scale2 = round($old_w/$old_h,2);
If($scale1 > $scale2){
$end_h = round($old_w/$scale1,2);
$end_w = round($old_h*$scale1,2);
$start_w = ($old_w-$end_w)/2;
$start_h = 0;
$end_h = $old_h;
}
$width = $new_w;
$height= $new_h;
} elseif($cut == 2){ // left top 裁剪
$scale1 = round($new_w/$new_h,2);
$scale2 = round($old_w/$old_h,2);
if($scale1 > $scale2){
$end_h = round($old_w/$scale1,2);
$end_w = $old_w;
} else{
$end_w = round($old_h*$scale1,2);
$end_h = $old_h;
}
$start_w = 0;
$start_h = 0;
$width = $new_w;
$height= $new_h;
}
// 载入原图
$createFun = 'ImageCreateFrom'.$type;
$oldimg = $createFun($this->img);
// 创建缩略图
if($type!='gif' && function_exists('imagecreatetruecolor')){
$newimg = imagecreatetruecolor($width, $height);
} else{
$newimg = imagecreate($width, $height);
}
// 复制图片
if(function_exists("ImageCopyResampled")){
ImageCopyResampled($newimg, $oldimg, 0, 0, $start_w, $start_h, $width, $height, $end_w,$end_h);
} else{
ImageCopyResized($newimg, $oldimg, 0, 0, $start_w, $start_h, $width, $height, $end_w,$end_h);
}
//Set interlacing for jpeg graphics
$type == 'jpeg' && imageinterlace($newimg,1);
$imageFun = 'image'.$type;
!@$imageFun($newimg,$filename,100) && die('Save failed! Check whether the directory exists and is writable?');
ImageDestroy($newimg);
ImageDestroy($oldimg);
return $filename;
}
return false;
}
// water(save address, watermark image, watermark position, transparency)
public function water($filename,$water,$pos=0,$pct=50){
$info = $this->getImageInfo($water);
If(!empty($info[0])){
$water_w = $info[0];
$water_h = $info[1];
$type = $info['type'];
$fun = 'imagecreatefrom'.$type;
$waterimg = $fun($water);
} else{
return false;
}
$info = $this->getImageInfo($this->img);If(!empty($info[0])){
$old_h = $info[1];
$type = $info['type'];
$fun = 'imagecreatefrom'.$type;
$oldimg = $fun($this->img);
} else{
return false;
}
$water_w >$old_w && $water_w = $old_w;
$water_h >$old_h && $water_h = $old_h;
// Watermark position
switch($pos){
case 0://random
$posX = rand(0,($old_w - $water_w));
$posY = rand(0,($old_h - $water_h));
break;
case 1://1 is the top left
$posX = 0;
$posY = 0;
break;
case 2://2 is top-centered
$posX = ($old_w - $water_w) / 2;
$posY = 0;
break;
case 3://3 is the top right
$posX = $old_w - $water_w;
$posY = 0;
break;
case 4://4 is the center on the left
$posX = 0;
$posY = ($old_h - $water_h) / 2;
break;
case 5://5 is centered in the middle
$posX = ($old_w - $water_w) / 2;
$posY = ($old_h - $water_h) / 2;
break;
case 6://6 is the center on the right
$posX = $old_w - $water_w;
$posY = ($old_h - $water_h) / 2;
break;
case 7://7 means the bottom is on the left
$posX = 0;
$posY = $old_h - $water_h;
break;
case 8://8 is the bottom center
$posX = ($old_w - $water_w) / 2;
$posY = $old_h - $water_h;
break;
case 9://9 is the bottom right
$posX = $old_w - $water_w;
$posY = $old_h - $water_h;
break;
Default: // Random
$posX = rand(0,($old_w - $water_w));
$posY = rand(0,($old_h - $water_h));
break;
}
// Set the color blending mode of the image
Imagealphablending($oldimg, true);
Imagecopymerge($oldimg, $waterimg, $posX, $posY, 0, 0, $water_w,$water_h,$pct);
$fun = 'image'.$type;
!@$fun($oldimg, $filename,100) && die('Save failed! Check whether the directory exists and is writable?');
imagedestroy($oldimg);
imagedestroy($waterimg);
return $filename;
}
}
$imgs=new image();
$tempFile = "./images/hdb.jpg";
$water = "./images/bamiluo.jpg";
$imgs->param($tempFile);
//if(!$imgs->thumb($targetFile,600,500))die('fail');
$imgs->water($targetFile,$water,0,10);
echo "aaa";
?>
Excerpted from: ws07_byyy’s column

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