(Advanced) common php image processing

* Known problems: 1. in the image scaling function, use the imagecreatetruecolor function to create a canvas and use a transparent processing algorithm. However, images in PNG format cannot be transparent. Using the imagecreate function to create a canvas can solve this problem, but the scaled image color is too small. (Advanced) common php image processing

 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 () {// different function switches ($ this-> types) {case 1 based on the input type value: $ this-> scaling (); break; case 2: $ this-> clipping (); break; case 3: $ this-> imagewater (); break; default: return false ;} Private function imagewater () {// add an image watermark function // use a function to obtain the length and width of the watermark file $ imagearrs = $ this-> getimagearr ($ this-> value1 ); // call the function to calculate the position where the watermark is loaded. $ positionarr = $ this-> position ($ this-> value2, $ imagearrs [0], $ imagearrs [1]); // add the watermark imagecopy ($ this-> image, $ this-> imagesources ($ this-> value1), $ positionarr [0], $ positionarr [1], 0, 0, $ imagearrs [0], $ imagearrs [1]); // call the output method to save $ this-> output ($ this-> image);} private function cli Pping () {// Image cropping function // assign the passed values to the variable 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) {// this judgment means that the canvas resource $ newimg = imagecreatetruecolor ($ dst_w, $ dst_h) cannot be captured outside the image to return false;} // create a new canvas resource $ newimg ); // crop imagecopyresampled ($ newimg, $ this-> image, 0, 0, $ src_x, $ src_y, $ dst_w, $ dst_h, $ dst_w, $ dst_h );// Call the output method to save $ this-> output ($ newimg);} private function scaling () {// image scaling function // Get the width and height of proportional scaling $ this-> proimagesize (); // scale according to parameters, and call the output function to save the processed file $ this-> output ($ this-> imagescaling ();} private function imagesources ($ imgad) {// Obtain the image type and open 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; $ I Mg = 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 () {// Retrieve image height return imagesy ($ this-> image);} private function proimagesize () {// calculate the width and height of the scaled image. if ($ this-> value1 & ($ this-> width <$ this-> height) {// and so on Scaling Algorithm $ this-> value1 = round ($ this-> value2/$ this-> height) * $ this-> width );} else {$ this-> value2 = round ($ this-> value1/$ this-> width) * $ this-> height) ;}} private function imagescaling () {// The Image scaling function returns the processed image resource $ newimg = imagecreatetruecolor ($ this-> value1, $ this-> value2 ); $ tran = imagecolortransparent ($ this-> image); // process the transparent 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) {// 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) {// return the image attribute array method return getimagesize ($ imagesou );} private function position ($ num, $ width, $ height) {// returns the coordinates of a position based on the input number, $ width and $ height indicate the width and height of the inserted Image. 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; $ positi Onarr [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-$ heigh T); break;} return $ positionarr;} function _ destruct () {imagedestroy ($ this-> image) ;}}?>

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