In-depth analysis of CodeIgniter Image processing

This article provides a detailed analysis of CodeIgniter's image processing class. For more information, see Image. php

The code is as follows:

Class Image extends Controller {
Function Image ()
{
Parent: Controller ();
$ This-> load-> library ('image _ lib ');
}

// Thumbnail
Function index (){
Echo '* resize the image

* Create a thumbnail

* Image cropping

* Image rotation

* Add an image watermark

';
}
// Thumbnail
Function resize (){
/*
Note:
When $ config ['create _ thumb'] is equal to FALSE and $ config ['new _ image'] is not specified, the source image size is adjusted.
When $ config ['create _ thumb'] is equal to TRUE and $ config ['new _ image'] is not specified, the generated file name is (original image name _ thumb. extension)
When $ config ['create _ thumb'] is equal to FALSE and $ config ['new _ image'] is specified, the value of the generated file name is $ config ['new _ image '].
When $ config ['create _ thumb'] is equal to TRUE and $ config ['new _ image'] is specified, the generated file name is (original image name _ thumb. extension)
*/
$ Config ['image _ library'] = 'gd2'; // (required) set the image library
$ Config ['Source _ image'] = 'ptjsite/upload/55002.jpg '; // (required) set the name/path of the original image
$ Config ['dynamic _ output'] = FALSE; // determines whether the new image is generated by writing it to the hard disk or dynamically.
$ Config ['quality'] = '000000'; // set the image quality. Higher quality, larger image files
$ Config ['new _ image'] = 'ptjsite/upload/resize004.gif '; // set the target name/path of the image.
$ Config ['width'] = 575; // (required) set the image width you want.
$ Config ['height'] = 350; // (required) set the image height
$ Config ['create _ thumb'] = TRUE; // let the image processing function generate a preview image (before _ thumb is inserted into the file extension)
$ Config ['thumb _ marker'] = '_ thumb'; // specifies the marker of the preview image. It will be before the file extension to be inserted. For example, mypic.jpg will be changed to mypic_thumb.jpg.
$ Config ['maintain _ ratio '] = TRUE; // maintain the proportion
$ Config ['master _ dim'] = 'auto'; // auto, width, and height specify the main axis
$ This-> image_lib-> initialize ($ config );
If (! $ This-> image_lib-> resize ())
{
Echo $ this-> image_lib-> display_errors ();
} Else {
Echo "successful ";
}
}
// Crop images
Function crop (){
$ Config ['image _ library'] = 'gd2'; // sets the image library.
$ Config ['Source _ image'] = 'ptjsite/upload/004.gif '; // (required) set the name/path of the original image
$ Config ['dynamic _ output'] = FALSE; // determines whether the new image is generated by writing it to the hard disk or dynamically.
$ Config ['quality'] = '000000'; // set the image quality. Higher quality, larger image files
$ Config ['new _ image'] = 'ptjsite/upload/crop004.gif '; // (required) set the target name/path of the image.

$ Config ['width'] = 75; // (required) set the image width you want.
$ Config ['height'] = 50; // (required) set the image height
$ Config ['maintain _ ratio '] = TRUE; // maintain the proportion
$ Config ['X _ axis '] = '30'; // (required) pixel value retrieved from the left
$ Config ['Y _ axis '] = '40'; // (required) pixel value retrieved from the header

$ This-> image_lib-> initialize ($ config );

If (! $ This-> image_lib-> crop ())
{
Echo $ this-> image_lib-> display_errors ();
} Else {
Echo "successful ";
}
}


// Image rotation
Function rotate (){
$ Config ['image _ library'] = 'gd2'; // (required) set the image library
$ Config ['Source _ image'] = 'ptjsite/upload/001.jpg '; // (required) set the name/path of the original image
$ Config ['dynamic _ output'] = FALSE; // determines whether the new image is generated by writing it to the hard disk or dynamically.
$ Config ['quality'] = '000000'; // set the image quality. Higher quality, larger image files
$ Config ['new _ image'] = 'ptjsite/upload/rotate001.jpg '; // set the target name/path of the image
$ Config ['rotation _ Ange'] = 'vrt '; // There are 5 rotation options: 90, 180, 270 degrees, vrt, vertical flip, hor, horizontal flip
$ This-> image_lib-> initialize ($ config );

If (! $ This-> image_lib-> rotate ())
{
Echo $ this-> image_lib-> display_errors ();
}
}

// Text watermark
Function watermark (){
$ Config ['image _ library'] = 'gd2'; // (required) set the image library
$ Config ['Source _ image'] = 'ptjsite/upload/003.jpg '; // (required) set the name and path of the original image. the path must be a relative or absolute path, but not a URL.
$ Config ['dynamic _ output'] = FALSE; // TRUE dynamic existence (output image directly to the browser), FALSE written to the hard disk
$ Config ['quality'] = '000000'; // set the image quality. Higher quality, larger image files
$ Config ['new _ image'] = 'ptjsite/upload/crop004.gif '; // set the target name/path of the image.

$ Config ['wm _ type'] = 'overlay '; // (required) set the watermark processing type (text, overlay) to be used)
$ Config ['wm _ padding '] = '5'; // relative position of the image (in pixels)
$ Config ['wm _ vrt_alignment '] = 'middle'; // top, middle, bottom
$ Config ['wm _ hor_alignment '] = 'center'; // left, center, right
$ Config ['wm _ vrt_offset '] = '0'; // specify a vertical offset (in pixels)
$ Config ['wm _ hor_offset '] = '0'; // specify a horizontal offset (in pixels)
/* Text watermark parameter settings */
$ Config ['wm _ text'] = 'copyright 2008-John Doe '; // (required) watermark text content
$ Config ['wm _ font_path'] = 'ptj _ system/fonts/type-ra.ttf '; // font name and path
$ Config ['wm _ font_size '] = '16'; // (required) text size
$ Config ['wm _ font_color '] = 'ff000000'; // (required) text color, hexadecimal number
$ Config ['wm _ shadow_color '] = 'ff0000'; // projection color, hexadecimal number
$ Config ['wm _ shadow_distance '] = '3'; // font and projection distance (in pixels ).
/* Image watermark parameter settings */
/*
$ Config ['wm _ overlay_path '] = 'ptjsite/upload/overlay.png'; // watermark image name and path
$ Config ['wm _ opacity '] = '50'; // watermark image transparency
$ Config ['wm _ x_transp '] = '4'; // watermark image Channel
$ Config ['wm _ y_transp '] = '4'; // watermark image Channel
*/
$ This-> image_lib-> initialize ($ config );
$ This-> image_lib-> watermark ();
}

// Image watermark
Function watermark2 (){
$ Config ['image _ library'] = 'gd2'; // (required) set the image library
$ Config ['Source _ image'] = 'ptjsite/upload/003.jpg '; // (required) set the name and path of the original image. the path must be a relative or absolute path, but not a URL.
$ Config ['dynamic _ output'] = FALSE; // TRUE dynamic existence (output image directly to the browser), FALSE written to the hard disk
$ Config ['quality'] = '000000'; // set the image quality. Higher quality, larger image files
$ Config ['new _ image'] = 'ptjsite/upload/crop004.gif '; // set the target name/path of the image.

$ Config ['wm _ type'] = 'overlay '; // (required) set the watermark processing type (text, overlay) to be used)
$ Config ['wm _ padding '] = '5'; // relative position of the image (in pixels)
$ Config ['wm _ vrt_alignment '] = 'middle'; // top, middle, bottom
$ Config ['wm _ hor_alignment '] = 'center'; // left, center, right
$ Config ['wm _ vrt_offset '] = '0'; // specify a vertical offset (in pixels)
$ Config ['wm _ hor_offset '] = '0'; // specify a horizontal offset (in pixels)
/* Text watermark parameter settings */
/*
$ Config ['wm _ text'] = 'copyright 2008-John Doe '; // (required) watermark text content
$ Config ['wm _ font_path'] = 'ptj _ system/fonts/type-ra.ttf '; // font name and path
$ Config ['wm _ font_size '] = '16'; // (required) text size
$ Config ['wm _ font_color '] = 'ff000000'; // (required) text color, hexadecimal number
$ Config ['wm _ shadow_color '] = 'ff0000'; // projection color, hexadecimal number
$ Config ['wm _ shadow_distance '] = '3'; // font and projection distance (in pixels ).
*/

/* Image watermark parameter settings */
$ Config ['wm _ overlay_path '] = 'ptjsite/upload/overlay.png'; // watermark image name and path
$ Config ['wm _ opacity '] = '50'; // watermark image transparency
$ Config ['wm _ x_transp '] = '4'; // watermark image Channel
$ Config ['wm _ y_transp '] = '4'; // watermark image Channel

$ This-> image_lib-> initialize ($ config );
$ This-> image_lib-> watermark ();
}
}
?>