Php image processing class code sharing
- 2020-05-10 17:54:52
- OfStack
At present, only 3 functions have been realized: 1: image zooming, 2: image clipping, 3: image watermarking
In an instantiation, different functionality is achieved by passing a different value to the second parameter
PHP code
In an instantiation, different functionality is achieved by passing a different value to the second parameter
<?php
include "image.class.php";
$image=new image("2.png", 1, "300", "500", "5.png"); // Use the image zoom function
$image=new image("2.png", 2, "0,0", "50,50", "5.png"); // Use the image clipping feature
$image=new image("2.png", 3, "1.png", "0", "5.png"); // Use image watermarking
$image->outimage();
?>
PHP code
<?php
/* Known problems: 1. In the image zooming function, use imagecreatetruecolor The function creates a canvas and USES a transparent processing algorithm, however PNG The format of the image cannot be transparent. with imagecreate The create canvas function solves this problem, but zooms out with too few colors
*
*
*type Value:
* ( 1 ) : represents the use of the image zooming function. At this point, $value1 Represents the width of the image after scaling, $value2 Represents the height of the image after scaling
* ( 2 ) : Is to use the image clipping function. At this point, $value1 The coordinate that represents the starting point of clipping. For example, starting from the origin is" 0,0 "The front is x Shaft is followed by y Axis, in the middle , Space, $value2 Is the width and height of the clipping, which is also" 20 . 20 "Is used in the form of
* ( 3 ) : Represents the use of the image watermarking function. At this point, $value1 The file name of the watermark image, $value2 Represents the position of the watermark in the image, yes 10 You can choose between them ,1 Top left, 2 That's the center left, 3 Stands for left and right, 4 Center left, 5 On behalf of the middle, 6 Center right, 7 I'm going to do, 8 Is the bottom, 9 That's the bottom right, 0 It's a random position
*
*/
class image{
private $types; // Function number used, 1 Zoom function for image 2 Clipping function for image 3, Add image watermarking to the image
private $imgtype;// Image format
private $image; // Image resources
private $width;// Image width
private $height;// Picture height
private $value1;// According to the report type The different values, $value1 Each represents a different value
private $value2;// According to the report type The different values, $value2 Each represents a different value
private $endaddress;// The address after the output + The file name
function __construct($imageaddress, $types, $value1="", $value2="", $endaddress){
$this->types=$types;
$this->image=$this->imagesources($imageaddress);
$this->width=$this->imagesizex();
$this->height=$this->imagesizey();
$this->value1=$value1;
$this->value2=$value2;
$this->endaddress=$endaddress;
}
function outimage(){ // According to the incoming type Different values output different functions
switch($this->types){
case 1:
$this->scaling();
break;
case 2:
$this->clipping();
break;
case 3:
$this->imagewater();
break;
default:
return false;
}
}
private function imagewater(){ // Add image watermarking function
// Function to get the length and width of the watermark file
$imagearrs=$this->getimagearr($this->value1);
// The call function calculates where the watermark is loaded
$positionarr=$this->position($this->value2, $imagearrs[0], $imagearrs[1]);
// watermarking
imagecopy($this->image, $this->imagesources($this->value1), $positionarr[0], $positionarr[1], 0, 0, $imagearrs[0], $imagearrs[1]);
// Call the output method save
$this->output($this->image);
}
private function clipping(){ // Image clipping function
// Assign the passed values to the variables separately
list($src_x, $src_y)=explode(",", $this->value1);
list($dst_w, $dst_h)=explode(",", $this->value2);
if($this->width < $src_x+$dst_w || $this->height < $src_y+$dst_h){ // The decision is to limit the ability to cut out of the picture
return false;
}
// Create a new canvas resource
$newimg=imagecreatetruecolor($dst_w, $dst_h);
// By cutting
imagecopyresampled($newimg, $this->image, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $dst_w, $dst_h);
// Call the output method save
$this->output($newimg);
}
private function scaling(){ // Image zooming function
// Gets the width and height of the scaling ratio
$this-> proimagesize();
// Scale according to the parameters , And call the output function to save the processed file
$this->output($this->imagescaling());
}
private function imagesources($imgad){ // Gets the image type and opens the image resource
$imagearray=$this->getimagearr($imgad);
switch($imagearray[2]){
case 1://gif
$this->imgtype=1;
$img=imagecreatefromgif($imgad);
break;
case 2://jpeg
$this->imgtype=2;
$img=imagecreatefromjpeg($imgad);
break;
case 3://png
$this->imgtype=3;
$img=imagecreatefrompng($imgad);
break;
default:
return false;
}
return $img;
}
private function imagesizex(){ // Get image width
return imagesx($this->image);
}
private function imagesizey(){ // Get image height
return imagesy($this->image);
}
private function proimagesize(){ // Calculates the height and width of a scaled image
if($this->value1 && ($this->width < $this->height)) { // Proportional scaling algorithm
$this->value1=round(($this->value2/ $this->height)*$this->width);
}else{
$this->value2=round(($this->value1/ $this->width) * $this->height);
}
}
private function imagescaling(){// Image zooming function, return the processed image resources
$newimg=imagecreatetruecolor($this->value1, $this->value2);
$tran=imagecolortransparent($this->image);// Processing transparency algorithm
if($tran >= 0 && $tran < imagecolorstotal($this->image)){
$tranarr=imagecolorsforindex($this->image, $tran);
$newcolor=imagecolorallocate($newimg, $tranarr['red'], $tranarr['green'], $tranarr['blue']);
imagefill($newimg, 0, 0, $newcolor);
imagecolortransparent($newimg, $newcolor);
}
imagecopyresampled($newimg, $this->image, 0, 0, 0, 0, $this->value1, $this->value2, $this->width, $this->height);
return $newimg;
}
private function output($image){// The output image
switch($this->imgtype){
case 1:
imagegif($image, $this->endaddress);
break;
case 2:
imagejpeg($image, $this->endaddress);
break;
case 3:
imagepng($image, $this->endaddress);
break;
default:
return false;
}
}
private function getimagearr($imagesou){// Returns an array of image properties
return getimagesize($imagesou);
}
private function position($num, $width, $height){// Returns based on the number passed in 1 Coordinates of position ,$width and $height Represents the width and height of the inserted image respectively
switch($num){
case 1:
$positionarr[0]=0;
$positionarr[1]=0;
break;
case 2:
$positionarr[0]=($this->width-$width)/2;
$positionarr[1]=0;
break;
case 3:
$positionarr[0]=$this->width-$width;
$positionarr[1]=0;
break;
case 4:
$positionarr[0]=0;
$positionarr[1]=($this->height-$height)/2;
break;
case 5:
$positionarr[0]=($this->width-$width)/2;
$positionarr[1]=($this->height-$height)/2;
break;
case 6:
$positionarr[0]=$this->width-$width;
$positionarr[1]=($this->height-$height)/2;
break;
case 7:
$positionarr[0]=0;
$positionarr[1]=$this->height-$height;
break;
case 8:
$positionarr[0]=($this->width-$width)/2;
$positionarr[1]=$this->height-$height;
break;
case 9:
$positionarr[0]=$this->width-$width;
$positionarr[1]=$this->height-$height;
break;
case 0:
$positionarr[0]=rand(0, $this->width-$width);
$positionarr[1]=rand(0, $this->height-$height);
break;
}
return $positionarr;
}
function __destruct(){
imagedestroy($this->image);
}
}
?>