PHP common Image processing Class _php tutorial

We often in the operation of the image will have a watermark thumbnail and watermark can be assigned to the optional, 1 for the left, 2 for the left, 3 for about, 4 for the middle left, 5 for middle, 6 for the right, 7 for the next, 8 for the next, 9 for the next right, 0 for the random position

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/* Known Issues: 1. In the picture zoom function, use the Imagecreatetruecolor function to create the canvas and use the transparent processing algorithm, but the PNG format picture is not transparent. Creating a canvas with the Imagecreate function solves this problem, but the number of image colors is too small to scale * * *type Value: * (1): Represents the use of the image zoom function, at this time, $value 1 represents the width of the scaled picture, $value 2 for the height of the image after zooming * (2): Represents the use of the picture clipping function, at this time, the $value 1 represents the coordinates of the clipping start point, example: From the origin point is "0,0" is preceded by the x axis is the y axis, the middle with, separated, $value 2 means the width and height of the crop, also is the form of "20,20" use * (3): Represents the use of the image watermark function, at this time, $value 1 for the watermark image file name, $value 2 for the watermark in the picture position, there are 10 values can be selected, 1 for the left, 2 for the left, 3 for around, 4 for the left, 5 for the middle, 6 for the right, 7 for the next, 8 for next, 9 for lower right, 0 for random position * */ Class image{ Private $types; Use the function number, 1 for the picture zoom function 2 for the picture clipping function 3, for picture and picture watermark function private $imgtype;//The format of the picture Private $image; Picture Resources private $width;//Picture width private $height;//Picture height Private $value 1;//$value 1 represents a different value depending on the type value passed Private $value 2;//$value 2 represents a different value depending on the type value passed private $endaddress;//Address after output + file name function __construct ($imageaddress, $types, $value 1= "", $value 2= "", $endaddress) { $this->types= $types; $this->image= $this->imagesources ($imageaddress); $this->width= $this->imagesizex (); $this->height= $this->imagesizey (); $this->value1= $value 1; $this->value2= $value 2; $this->endaddress= $endaddress; } function Outimage () {//output different functions depending on the type value passed in Switch ($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 watermark function Use function to get the length and width of watermark file $imagearrs = $this->getimagearr ($this->value1); The calling function calculates where the watermark is loaded $positionarr = $this->position ($this->value2, $imagearrs [0], $imagearrs [1]); Add watermark Imagecopy ($this->image, $this->imagesources ($this->value1), $positionarr [0], $positionarr [1], 0, 0, $ Imagearrs[0], $imagearrs [1]); Call output method to save $this->output ($this->image); } Private Function clipping () {//Picture clipping function Assigns the passed in values to the variable 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 judgment is that the limit cannot be intercepted outside the picture return false; } Create a new canvas resource $newimg =imagecreatetruecolor ($dst _w, $dst _h); to crop Imagecopyresampled ($newimg, $this->image, 0, 0, $src _x, $src _y, $dst _w, $dst _h, $dst _w, $dst _h); Call output method to save $this->output ($NEWIMG); } Private Function Scaling () {//Picture zoom function Get the width and height of equal to zoom $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) {//Get picture type and open 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 $img; } Private Function Imagesizex () {//Get picture width Return Imagesx ($this->image); } Private Function Imagesizey () {//Get picture height Return Imagesy ($this->image); } Private Function Proimagesize () {//compute and more than scaled picture width and height if ($this->value1 && ($this->width < $this->height)) {//equal ratio 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 zoom function, return the processed image resource $newimg =imagecreatetruecolor ($this->value1, $this->value2); $tran =imagecolortransparent ($this->image);//processing 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) {//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 image attribute array method Return getimagesize ($imagesou); } Private function position ($num, $width, $height) {//returns the coordinates of a position based on the number passed in, $width and $height represent the width and height of the inserted image, respectively Switch ($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); } } ?>

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