Php image scaling code-a very useful method for proportional scaling or capturing a thumbnail of a specified size

/*************************************** * ******************* Functionresize: ** createsaresizedimagebasedonthemaxwidth * specifiedaswellasgenerates

 

/*************************************** *******************

* Function resize:

*

* = Creates a resized image based on the max width

* Specified as well as generates a thumbnail from

* A rectangle cut from the middle of the image.

*

* @ Dir = directory image is stored in

* @ Newdir = directory new image will be stored in

* @ Img = the image name

* @ Newimg = the image new name

* @ Max_w = the max width of the resized image

* @ Max_h = the max height of the resized image

* @ Th_x = The starting point of the x-coordinate

* @ Th_y = The starting point of the y-coordinate

* @ Th_w = the width of the thumbnail

* @ Th_h = the height of the thumbnail

* @ Cut = Whether to need cut out

* @ Center = whether cut from the middle of the image

*

**************************************** ******************/

 

Function resize ($ dir, $ newdir, $ img, $ newimg, $ max_w, $ max_h, $ th_x = '', $ th_y ='', $ th_w = '', $ th_h = '', $ cut = FALSE, $ center = FALSE)

{

// Set destination directory

If (! $ Newdir) $ newdir = $ dir;

If (! $ Newimg) $ newimg = $ img;

 

// Get original images width and height

List ($ or_w, $ or_h, $ or_t) = getimagesize ($ dir. $ img );

Switch ($ or_t ){

// Original image

Case 1:

$ Or_image = imagecreatefromgif ($ dir. $ img );

Break;

Case 2:

$ Or_image = imagecreatefromjpeg ($ dir. $ img );

Break;

Case 3:

$ Or_image = imagecreatefrompng ($ dir. $ img );

Break;

Default:

Return 'unsupported Image format'; www.2cto.com

Break;

}

 

// Make sure image is a jpeg

// If ($ or_t = 2 ){

// Obtain the image's ratio

// $ Ratio = ($ or_h/$ or_w );

$ Ratio = ($ max_h/$ max_w );

 

// Original image

// $ Or_image = imagecreatefromjpeg ($ dir. $ img );

 

// Resize image?

If ($ or_w> $ max_w | $ or_h> $ max_h ){

 

// Resize by height, then width (height dominant)

If ($ max_h <$ max_w ){

$ Rs_h = $ max_h;

$ Rs_w = $ rs_h/$ ratio;

}

// Resize by width, then height (width dominant)

Else {

$ Rs_w = $ max_w;

$ Rs_h = $ ratio * $ rs_w;

}

 

// Copy old image to new image

$ Rs_image = imagecreatetruecolor ($ rs_w, $ rs_h );

Imagecopyresampled ($ rs_image, $ or_image, 0, 0, 0, 0, $ rs_w, $ rs_h, $ or_w, $ or_h );

}

// Image requires no resizing

Else {

$ Rs_w = $ or_w;

$ Rs_h = $ or_h;

 

$ Rs_image = $ or_image;

}

 

// Generate resized image

DrawImage ($ rs_image, $ newdir. $ newimg, $ or_t, 100 );

 

// Crop to generate the specified size start -------------------

If ($ cut ){

$ Th_image = imagecreatetruecolor ($ th_w, $ th_h );

 

// Cut out a rectangle from the resized image and store in thumbnail

If ($ center ){

$ New_w = ($ rs_w/2)-($ th_w/2 ));

$ New_h = ($ rs_h/2)-($ th_h/2 ));

} Else {

$ New_w = $ th_x;

$ New_h = $ th_y;

}

Imagecopyresampled ($ th_image, $ rs_image, 0, 0, $ new_w, $ new_h, $ rs_w, $ rs_h, $ rs_w, $ rs_h );

// Generate thumbnail

DrawImage ($ th_image, $ newdir. 'th _ '. $ newimg, $ or_t, 100 );

@ ImageDestroy ($ th_image );

}

// Generate the specified size of end -------------------

 

// Return true;

//}

 

// Image type was not jpeg!

/* Else {

Return false;

}*/

@ ImageDestroy ($ rs_image );

}

 

/**

* @ Resource image

* @ Filename

* @ Quality

* @ Type

**/

 

Function DrawImage ($ resource, $ filename, $ type, $ quality ){

Switch ($ type ){

// Original image

Case 1:

$ Or_image = imagegif ($ resource, $ filename );

Break;

Case 2:

$ Or_image = imagejpeg ($ resource, $ filename, $ quality );

Break;

Case 3:

$ Or_image = imagepng ($ resource, $ filename );

Break;

}

}

 

From the aa705123123 column