相關(guān)關(guān)鍵詞
關(guān)于我們
最新文章
- PHP中opcode緩存簡(jiǎn)單用法分析
- thinkPHP控制器變量在模板中的顯示方法示例
- PHP move_uploaded_file() 函數(shù)(將上傳的文件移動(dòng)到新位置)
- dirname(__FILE__)的含義和應(yīng)用說(shuō)明
- thinkPHP5框架實(shí)現(xiàn)分頁(yè)查詢(xún)功能的方法示例
- PHP中單雙號(hào)與變量
- PHP獲得當(dāng)日零點(diǎn)時(shí)間戳的方法分析
- Laravel ORM對(duì)Model::find方法進(jìn)行緩存示例詳解
- PHP讀寫(xiě)文件高并發(fā)處理操作實(shí)例詳解
- 【CLI】利用Curl下載文件實(shí)時(shí)進(jìn)度條顯示的實(shí)現(xiàn)
PHP全功能無(wú)變形圖片裁剪操作類(lèi)與用法示例
本文實(shí)例講述了PHP全功能無(wú)變形圖片裁剪操作類(lèi)與用法。分享給大家供大家參考,具體如下:
如果需要圖片裁剪,或生成縮略圖,這個(gè)基本上沒(méi)有問(wèn)題,全部需要的功能都在里面,全部都是無(wú)變形的。
這里我們劃分為四種模式:
1. 任意圖片裁剪到指定大小,超過(guò)的,劇中裁剪,并且最大化縮放,不夠的拉伸,
2. 超過(guò)的劇中裁剪,而不足的,不拉伸,即只縮小,不放大裁剪,會(huì)產(chǎn)生補(bǔ)白,可以用png透明度來(lái)消除
3. 保留全部圖片信息。不裁剪,只縮放,不足的補(bǔ)白。
4. 保留全部圖片信息。不裁剪,只縮放,不足的不補(bǔ)白,產(chǎn)生的圖片為實(shí)際有效像素大小,例如有個(gè)圖片是600X600 現(xiàn)在要生成 120X100 那么縮放后的實(shí)際有效像素為100X100,所以只生成100X100的圖片,而第三種模式則生成120X100的大小,并且有補(bǔ)白
代碼如下(此處代碼通過(guò)本站在線(xiàn)工具h(yuǎn)ttp://tools.jb51.net/code/jb51_php_format做了格式化處理):
<?php /** * Author : smallchicken * mode 1 : 強(qiáng)制裁剪,生成圖片嚴(yán)格按照需要,不足放大,超過(guò)裁剪,圖片始終鋪滿(mǎn) * mode 2 : 和1類(lèi)似,但不足的時(shí)候 不放大 會(huì)產(chǎn)生補(bǔ)白,可以用png消除。 * mode 3 : 只縮放,不裁剪,保留全部圖片信息,會(huì)產(chǎn)生補(bǔ)白, * mode 4 : 只縮放,不裁剪,保留全部圖片信息,生成圖片大小為最終縮放后的圖片有效信息的實(shí)際大小,不產(chǎn)生補(bǔ)白 * 默認(rèn)補(bǔ)白為白色,如果要使補(bǔ)白成透明像素,請(qǐng)使用SaveAlpha()方法代替SaveImage()方法 * * 調(diào)用方法: * * $ic=new ImageCrop('old.jpg','afterCrop.jpg'); * $ic->Crop(120,80,2); * $ic->SaveImage(); * //$ic->SaveAlpha();將補(bǔ)白變成透明像素保存 * $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 } ?>
相關(guān)文章
- smarty foreach函數(shù)
- Smarty中foreach的index、iteration,@count的使用
- 去掉織夢(mèng)建站或者仿站時(shí)首頁(yè)訪(fǎng)問(wèn)地址后的index.html
- MySQL修改編碼設(shè)置及亂碼問(wèn)題
- WampServer搭建PHP+Apache+MySQL環(huán)境
- 修改WAMP的www目錄的全過(guò)程
- 歸并排序:歸并操作的一種有效排序算法
- 如何編寫(xiě)PHP擴(kuò)展
- 如何克服php的register_global被關(guān)掉
- php正則表達(dá)式匹配img中任意屬性的方法