Das Beispiel in diesem Artikel beschreibt die voll funktionsfähige Klasse für den Bildzuschneidevorgang ohne Verformung und die Verwendung von PHP. Teilen Sie es als Referenz mit allen. Die Details lauten wie folgt:
Wenn Sie Bilder zuschneiden oder Miniaturansichten erstellen müssen, ist das im Grunde kein Problem. Alle erforderlichen Funktionen sind darin enthalten und sie sind alle nicht verformbar .
Hier unterteilen wir es in vier Modi:
1. Beschneiden Sie jedes Bild auf die angegebene Größe, wenn es größer ist, schneiden Sie es im Spiel zu und maximieren Sie den Zoom, wenn es nicht gestreckt ist genug,
2 . Übermäßiges Zuschneiden im Spiel, aber unzureichend, keine Dehnung, d Information. Kein Zuschneiden, nur Skalieren, unzureichende Polsterung.
4. Bewahren Sie alle Bildinformationen auf. Kein Zuschneiden, nur Zoomen und bei Bedarf kein Auffüllen. Das generierte Bild hat beispielsweise die Größe 600 x 600 und Sie möchten nun 120 x 100 erzeugen, dann sind die tatsächlichen effektiven Pixel nach der Skalierung also 100 x 100 Es wird nur ein 100 x 100-Bild generiert, und der dritte Modus generiert eine Größe von 120 x 100 und verfügt über Füller.
<?php /** * Author : smallchicken * mode 1 : 强制裁剪,生成图片严格按照需要,不足放大,超过裁剪,图片始终铺满 * mode 2 : 和1类似,但不足的时候 不放大 会产生补白,可以用png消除。 * mode 3 : 只缩放,不裁剪,保留全部图片信息,会产生补白, * mode 4 : 只缩放,不裁剪,保留全部图片信息,生成图片大小为最终缩放后的图片有效信息的实际大小,不产生补白 * 默认补白为白色,如果要使补白成透明像素,请使用SaveAlpha()方法代替SaveImage()方法 * * 调用方法: * * $ic=new ImageCrop('old.jpg','afterCrop.jpg'); * $ic->Crop(120,80,2); * $ic->SaveImage(); * //$ic->SaveAlpha();将补白变成透明像素保存 * $ic->destory(); * * */ class ImageCrop { var $sImage; var $dImage; var $src_file; var $dst_file; var $src_width; var $src_height; var $src_ext; var $src_type; function ImageCrop($src_file,$dst_file='') { $this->src_file=$src_file; $this->dst_file=$dst_file; $this->LoadImage(); } function SetSrcFile($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); break; 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) $this->dst_file=$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 crop if( ($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,$tmp_img,0,0,0,0,$dst_width,$dst_height,$tmp_w,$tmp_h); imagedestroy($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); $tmp_img=imagecreatetruecolor($tmp_w ,$tmp_h); imagecopyresampled($tmp_img,$this->sImage,0,0,0,0,$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, $tmp_img, 0,0,$src_x,$src_y,$dst_width,$dst_height); imagedestroy($tmp_img); } break; case 2: // only small if($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,$tmp_img,0,0,0,0,$dst_width,$dst_height,$tmp_w,$tmp_h); imagedestroy($tmp_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,$this->src_height); } break; case 3: // keep all image size and create need size if($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); $tmp_img=imagecreatetruecolor($tmp_w ,$tmp_h); imagecopyresampled($tmp_img,$this->sImage,0,0,0,0,$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($tmp_img); } break; case 4: // keep all image but create actually size if($ratio_w > 1 && $ratio_h > 1) { $this->dImage = imagecreatetruecolor($this->src_width,$this->src_height); imagecopy($this->dImage, $this->sImage,0,0,0,0,$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,$this->sImage,0,0,0,0,$tmp_w,$tmp_h,$this->src_width,$this->src_height); } break; } } // end Crop } ?>