PHP image cropping thumbnail cropping source code and usage

: This article mainly introduces PHP image cropping and cropping source code and usage methods. if you are interested in PHP Tutorial, please refer to it. Recently, for an open-source project that is used to drag and drop verification codes on webpages, you need to generate removable color blocks for images on the server. However, resources on the Internet are thumbnails to scale the entire image, completed the tool for cropping small pieces of images.

<? Phpnamespace App \ Libs;/*** 15:54:58 * Lixiaoyu ** mode 1: similar to 1, but if it is insufficient, it will generate a fill white if it is not zoomed in. you can use png to remove it. * Mode 3: only scaling, no cropping, retain all image information, will generate a fill White, * mode 4: only scaling, no cropping, keep all image information, the size of the generated image is the actual size of the final scaled image's valid information. no padding is generated. * The default padding is white. to make the padding transparent, use SaveAlpha () the method replaces the SaveImage () method */class ImageCrop {var $ sImage; var $ dImage; var $ src_file; var $ dst_file; var $ src_width; var $ src_height; var $ src_ext; var $ src_type; function _ construct ($ src_file, $ dst_file = '') {$ this-> src_file = $ src_file; $ this-> dst_file = $ dst_file; $ this-> LoadImage ();} function Se TSrcFile ($ src_file) {$ this-> src_file = $ src_file;} function SetDstFile ($ dst_file) {$ this-> dst_file = $ dst_file;} function LoadImage () {list ($ this-> src_width, $ this-> src_height, $ this-> src_type) = getimagesize ($ this-> src_file); switch ($ this-> src_type) {case IMAGETYPE_JPEG: $ this-> sImage = imagecreatefromjpeg ($ this-> src_file); $ this-> ext = 'jpg '; break; case IMAGETYPE_PNG: $ this-> sImage = imagecreatefrompng ($ this-> src _ File); $ this-> ext = 'PNG '; break; case IMAGETYPE_GIF: $ this-> sImage = imagecreatefromgif ($ this-> src_file ); $ this-> ext = 'GIF'; break; default: exit () ;}} function SaveImage ($ fileName = '') {$ this-> dst_file = $ fileName? $ FileName: $ this-> dst_file; switch ($ this-> src_type) {case IMAGETYPE_JPEG: imagejpeg ($ this-> dImage, $ this-> dst_file, 100); break; case IMAGETYPE_PNG: imagepng ($ this-> dImage, $ this-> dst_file); break; case IMAGETYPE_GIF: imagegif ($ this-> dImage, $ this-> dst_file); break; default: break ;}} function OutImage () {switch ($ this-> src_type) {case IMAGETYPE_JPEG: header ('content-type: image/jpeg '); imagejpeg ($ this-> dImage); B Reak; case IMAGETYPE_PNG: header ('content-type: image/png '); imagepng ($ this-> dImage); break; case IMAGETYPE_GIF: header ('content-type: image/gif '); imagegif ($ this-> dImage); break; default: break;} function SaveAlpha ($ fileName = '') {$ this-> dst_file = $ fileName? $ FileName. '.png ': $ this-> dst_file .'.png'; imagesavealpha ($ this-> dImage, true); imagepng ($ this-> dImage, $ this-> dst_file );} function OutAlpha () {imagesavealpha ($ this-> dImage, true); header ('content-type: image/png '); imagepng ($ this-> dImage );} function destory () {imagedestroy ($ this-> sImage); imagedestroy ($ this-> dImage);} function Crop ($ dst_width, $ dst_height, $ mode = 1, $ dst_file = '') {if ($ dst_file) $ this-> dst_fil E = $ dst_file; $ this-> dImage = imagecreatetruecolor ($ dst_width, $ dst_height); $ bg = imagecolorallocatealpha ($ this-> dImage 255,255,255,127 ); imagefill ($ this-> dImage, 0, 0, $ bg); imagecolortransparent ($ this-> dImage, $ bg ); $ ratio_w = 1.0 * $ dst_width/$ this-> src_width; $ ratio_h = 1.0 * $ dst_height/$ this-> src_height; $ ratio = 1.0; switch ($ mode) {case 1: // always cropif ($ ratio_w <1 & $ ratio_h <1) | ($ ratio_w> 1 & $ ratio_h> 1) {$ ratio = $ ratio_w <$ ratio_h? $ Ratio_h: $ ratio_w; $ tmp_w = (int) ($ dst_width/$ ratio); $ tmp_h = (int) ($ dst_height/$ ratio ); $ tmp_img = imagecreatetruecolor ($ tmp_w, $ tmp_h); $ src_x = (int) ($ this-> src_width-$ tmp_w)/2); $ src_y = (int) ($ this-> src_height-$ tmp_h)/2); imagecopy ($ tmp_img, $ this-> sImage, 0, 0, $ src_x, $ src_y, $ tmp_w, $ tmp_h); imagecopyresampled ($ this-> dImage, $ tmp_img, 0, 0, 0, $ dst_width, $ dst_height, $ tmp_w, $ tmp_h); imagedestro Y ($ tmp_img);} else {$ ratio = $ ratio_w <$ ratio_h? $ Ratio_h: $ ratio_w; $ tmp_w = (int) ($ this-> src_width * $ ratio); $ tmp_h = (int) ($ this-> src_height * $ ratio ); $ tmp_img = values ($ tmp_w, $ tmp_h); imagecopyresampled ($ tmp_img, $ this-> sImage, $ tmp_w, $ tmp_h, $ this-> src_width, $ this-> src_height); $ src_x = (int) ($ tmp_w-$ dst_width)/2; $ src_y = (int) ($ tmp_h-$ dst_height)/2; imagecopy ($ this-> dImage, $ tmp_img, 0, $ src_x, $ src_y, $ dst_width, $ d St_height); imagedestroy ($ tmp_img);} break; case 2: // only smallif ($ ratio_w <1 & $ ratio_h <1) {$ ratio = $ ratio_w <$ ratio_h? $ Ratio_h: $ ratio_w; $ tmp_w = (int) ($ dst_width/$ ratio); $ tmp_h = (int) ($ dst_height/$ ratio ); $ tmp_img = imagecreatetruecolor ($ tmp_w, $ tmp_h); $ src_x = (int) ($ this-> src_width-$ tmp_w)/2; $ src_y = (int) ($ this-> src_height-$ tmp_h)/2; imagecopy ($ tmp_img, $ this-> sImage, 0, $ src_x, $ src_y, $ tmp_w, $ tmp_h ); imagecopyresampled ($ this-> dImage, $ tmp_img, 0, 0, 0, $ dst_width, $ dst_height, $ tmp_w, $ tmp_h); imagedestroy ($ t Mp_img);} elseif ($ ratio_w> 1 & $ ratio_h> 1) {$ dst_x = (int) abs ($ dst_width-$ this-> src_width)/2; $ dst_y = (int) abs ($ dst_height-$ this-> src_height)/2; imagecopy ($ this-> dImage, $ this-> sImage, $ dst_x, $ dst_y, 0, 0, $ this-> src_width, $ this-> src_height);} else {$ src_x = 0; $ dst_x = 0; $ src_y = 0; $ dst_y = 0; if ($ dst_width-$ this-> src_width) <0) {$ src_x = (int) ($ this-> src_width-$ dst_width)/2; $ dst_x = 0;} else {$ src _ X = 0; $ dst_x = (int) ($ dst_width-$ this-> src_width)/2;} if ($ dst_height-$ this-> src_height) <0) {$ src_y = (int) ($ this-> src_height-$ dst_height)/2; $ dst_y = 0;} else {$ src_y = 0; $ dst_y = (int) ($ dst_height-$ this-> src_height)/2;} imagecopy ($ this-> dImage, $ this-> sImage, $ dst_x, $ dst_y, $ src_x, $ src_y, $ this-> src_width, $ this-> src_height);} break; case 3: // keep all image size and create need sizeif ($ ratio _ W> 1 & $ ratio_h> 1) {$ dst_x = (int) (abs ($ dst_width-$ this-> src_width)/2); $ dst_y = (int) (abs ($ dst_height-$ this-> src_height)/2); imagecopy ($ this-> dImage, $ this-> sImage, $ dst_x, $ dst_y, 0, 0, $ this-> src_width, $ this-> src_height);} else {$ ratio = $ ratio_w> $ ratio_h? $ Ratio_h: $ ratio_w; $ tmp_w = (int) ($ this-> src_width * $ ratio); $ tmp_h = (int) ($ this-> src_height * $ ratio ); $ tmp_img = values ($ tmp_w, $ tmp_h); imagecopyresampled ($ tmp_img, $ this-> sImage, $ tmp_w, $ tmp_h, $ this-> src_width, $ this-> src_height); $ dst_x = (int) (abs ($ tmp_w-$ dst_width)/2); $ dst_y = (int) (abs ($ tmp_h-$ dst_height)/2); imagecopy ($ this-> dImage, $ tmp_img, $ dst_x, $ dst_y, 0, 0, $ tmp_w, $ Tmp_h); imagedestroy ($ tmp_img);} break; case 4: // keep all image but create actually sizeif ($ ratio_w> 1 & $ ratio_h> 1) {$ this-> dImage = imagecreatetruecolor ($ this-> src_width, $ this-> src_height); imagecopy ($ this-> dImage, $ this-> sImage, 0, 0, 0, $ this-> src_width, $ this-> src_height);} else {$ ratio = $ ratio_w> $ ratio_h? $ Ratio_h: $ ratio_w; $ tmp_w = (int) ($ this-> src_width * $ ratio); $ tmp_h = (int) ($ this-> src_height * $ ratio ); $ this-> dImage = imagecreatetruecolor ($ tmp_w, $ tmp_h); imagecopyresampled ($ this-> dImage, $ this-> sImage, 0, 0, 0, $ tmp_w, $ tmp_h, $ this-> src_width, $ this-> src_height);} break ;}} // end Crop/***** cropping method * 15:05:44 * Lixiaoyu ** @ param $ dst_width destination length * @ param $ dst_height destination height * @ param $ dst_x cropping part and left side of the source image distance * @ Param $ distance between the dst_y cropping part and the right side of the source image * @ param int $ mode * @ param string $ dst_file destination file path */function Cut ($ dst_width, $ dst_height, $ dst_x, $ dst_y, $ dst_file = '') {if ($ dst_file) $ this-> dst_file = $ dst_file; // set the target file location $ this-> dImage = imagecreatetruecolor ($ dst_width, $ dst_height ); // Create a canvas of the target File Size $ bg = imagecolorallocatealpha ($ this-> dImage, 255,255,255,127); // assign the canvas color imagefill ($ this-> dImage, 0, 0, $ bg); // color the image Line-filling imagecolortransparent ($ this-> dImage, $ bg); // The background is defined as transparent. $ ratio_w = 1.0 * $ dst_width/$ this-> src_width; // scale horizontally $ ratio_h = 1.0 * $ dst_height/$ this-> src_height; // scale vertically // var_dump ($ this); // do not scale, crop an image directly $ ratio = 1.0; $ tmp_w = (int) ($ dst_width/$ ratio); $ tmp_h = (int) ($ dst_height/$ ratio ); $ tmp_img = imagecreatetruecolor ($ dst_width, $ dst_height); // Create a saved canvas imagecopy ($ tmp_img, $ this-> sImage, $ Dst_x, $ dst_y, $ dst_width, $ dst_height); // Copy a part of the image to crop imagecopyresampled ($ this-> dImage, $ tmp_img, $ dst_width, $ dst_height, $ tmp_w, $ tmp_h); // put the image temporarily cached in the target file imagedestroy ($ tmp_img); }}?>

Use

Crop Images

$ Ic = new ImageCrop ($ pathToFile ,'. /pic/afterCrop'.time().'.jpg '); $ ic-> Cut (120,130,); $ ic-> SaveImage (); // $ ic-> SaveAlpha (); convert the padding into transparent pixels and save $ ic-> destory ();

Effect

SOURCE image

Cropped graph

Zoom image

SOURCE image

Thumbnail

This article focuses on the use of image processing functions imagecopy and imagecopyresampled

Bool imagecopy (resource dstim, resourcesrc_im, int dstx, intdst_y, int srcx, intsrc_y, int srcw, intsrc_h)
Copy the coordinates of the src_im image from src_x, src_y, src_w in width, and src_h in height to the position where the coordinates of dst_im are dst_x and dst_y.

The above introduces the PHP image cropping and cropping source code and usage methods, including the content, hope to be helpful to friends who are interested in PHP tutorials.