php超全缩略图生成程序

<?php/** * Author : smallchicken * Time : 2009年6月8日16:46:05 * 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(){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,$this->dst_file);break;default:break;}}function SaveAlpha($fileName=''){$this->dst_file=$fileName ? $fileName . '.png' : $this->dst_file .'.png';imagesavealpha($this->dImage, true);imagepng($this->dImage,$this->dst_file);}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($mode){case 1:// always cropif( ($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,$tmp_img,0,0,0,0,$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 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, $this->sImage, 0,0,$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,$this->src_height);}break;case 3:// keep all image size and create need sizeif($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=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($tmp_img);}break;case 4:// keep all image but create actually sizeif($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}?>