图片指定大小然后由php相关函数来实现图片裁剪功能,前段的js效果在这里就不介绍了,大家可以到网上找有很多这类代码,我只整理了php操作部份.
方法一,代码如下,图片裁剪缩放函数,支持方位裁剪和自定义坐标裁剪.
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function thumb($src_file, $new_width, $new_height, $type = 1, $pos = 5, $start_x = 0, $start_y = 0) {
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$pathinfo = pathinfo($src_file);
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$dst_file = $pathinfo['dirname'] . '/' . $pathinfo['filename'] .'_'. $new_width . 'x' . $new_height . '.' . $pathinfo['extension'];
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if (!file_exists($dst_file)) {
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if ($new_width < 1 || $new_height < 1) {
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echo "params width or height error !";
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exit();
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}
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if (!file_exists($src_file)) {
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echo $src_file . " is not exists !";
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exit();
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}
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$img_type = exif_imagetype($src_file);
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$support_type = array(IMAGETYPE_JPEG, IMAGETYPE_PNG, IMAGETYPE_GIF);
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if (!in_array($img_type, $support_type, true)) {
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echo "只支持jpg、png、gif格式图片裁剪";
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exit();
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}
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switch ($img_type) {
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case IMAGETYPE_JPEG :
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$src_img = imagecreatefromjpeg($src_file);
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break;
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case IMAGETYPE_PNG :
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$src_img = imagecreatefrompng($src_file);
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break;
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case IMAGETYPE_GIF :
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$src_img = imagecreatefromgif($src_file);
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break;
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default:
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echo "载入图像错误!";
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exit();
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}
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$src_width = imagesx($src_img);
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$src_height = imagesy($src_img);
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$mid_width = ($src_width < $new_width) ? $src_width : $new_width;
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$mid_height = ($src_height < $new_height) ? $src_height : $new_height;
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switch ($pos * $type) {
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case 1:
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$start_x = 0;
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$start_y = 0;
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break;
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case 2:
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$start_x = ($src_width - $mid_width) / 2;
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$start_y = 0;
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break;
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case 3:
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$start_x = $src_width - $mid_width;
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$start_y = 0;
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break;
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case 4:
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$start_x = 0;
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$start_y = ($src_height - $mid_height) / 2;
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break;
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case 5:
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$start_x = ($src_width - $mid_width) / 2;
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$start_y = ($src_height - $mid_height) / 2;
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break;
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case 6:
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$start_x = $src_width - $mid_width;
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$start_y = ($src_height - $mid_height) / 2;
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break;
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case 7:
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$start_x = 0;
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$start_y = $src_height - $mid_height;
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break;
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case 8:
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$start_x = ($src_width - $mid_width) / 2;
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$start_y = $src_height - $mid_height;
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break;
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case 9:
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$start_x = $src_width - $mid_width;
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$start_y = $src_height - $mid_height;
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break;
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default:
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break;
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}
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$mid_img = imagecreatetruecolor($mid_width, $mid_height);
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imagecopy($mid_img, $src_img, 0, 0, $start_x, $start_y, $mid_width, $mid_height);
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$new_img = imagecreatetruecolor($new_width, $new_height);
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imagecopyresampled($new_img, $mid_img, 0, 0, 0, 0, $new_width, $new_height, $mid_width, $mid_height);
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switch ($img_type) {
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case IMAGETYPE_JPEG :
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imagejpeg($new_img, $dst_file, 100);
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break;
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case IMAGETYPE_PNG :
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imagepng($new_img, $dst_file, 9);
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break;
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case IMAGETYPE_GIF :
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imagegif($new_img, $dst_file, 100);
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break;
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default:
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break;
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}
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}
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return ltrim($dst_file, '.');
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}
附件是一个有样例图片的测试demo,不过,这个函数不支持动态gif图片的裁剪缩放.
方法二,代码如下:
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<?php
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list($src_w,$src_h)=getimagesize($src_img);
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$dst_scale = $dst_h/$dst_w;
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$src_scale = $src_h/$src_w;
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if($src_scale>=$dst_scale)
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{
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$w = intval($src_w);
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$h = intval($dst_scale*$w);
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$x = 0;
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$y = ($src_h - $h)/3;
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}
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else
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{
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$h = intval($src_h);
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$w = intval($h/$dst_scale);
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$x = ($src_w - $w)/2;
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$y = 0;
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}
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$source=imagecreatefromjpeg($src_img);
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$croped=imagecreatetruecolor($w, $h);
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imagecopy($croped,$source,0,0,$x,$y,$src_w,$src_h);
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$scale = $dst_w/$w;
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$target = imagecreatetruecolor($dst_w, $dst_h);
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$final_w = intval($w*$scale);
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$final_h = intval($h*$scale);
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imagecopysampled($target,$croped,0,0,0,0,$final_w,$final_h,$w,$h);
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$timestamp = time();
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imagejpeg($target, "$timestamp.jpg");
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imagedestroy($target);
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?>
方法三:根据自定义的目标图,按目标图高宽比裁剪、缩放源图.传入参数,代码如下:
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$source_path string 源图路径
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$target_width integer 目标图宽度
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$target_height integer 目标图高度
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支持图片类型: image/gif, image/jpeg, image/png.
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function imagecropper($source_path, $target_width, $target_height)
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{
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$source_info = getimagesize($source_path);
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$source_width = $source_info[0];
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$source_height = $source_info[1];
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$source_mime = $source_info['mime'];
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$source_ratio = $source_height / $source_width;
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$target_ratio = $target_height / $target_width;
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if ($source_ratio > $target_ratio)
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{
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$cropped_width = $source_width;
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$cropped_height = $source_width * $target_ratio;
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$source_x = 0;
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$source_y = ($source_height - $cropped_height) / 2;
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}
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elseif ($source_ratio < $target_ratio)
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{
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$cropped_width = $source_height / $target_ratio;
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$cropped_height = $source_height;
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$source_x = ($source_width - $cropped_width) / 2;
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$source_y = 0;
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}
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else
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{
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$cropped_width = $source_width;
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$cropped_height = $source_height;
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$source_x = 0;
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$source_y = 0;
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}
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switch ($source_mime)
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{
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case 'image/gif':
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$source_image = imagecreatefromgif($source_path);
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break;
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case 'image/jpeg':
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$source_image = imagecreatefromjpeg($source_path);
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break;
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case 'image/png':
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$source_image = imagecreatefrompng($source_path);
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break;
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default:
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return false;
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break;
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}
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$target_image = imagecreatetruecolor($target_width, $target_height);
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$cropped_image = imagecreatetruecolor($cropped_width, $cropped_height);
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imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height);
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imagecopyresampled($target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height);
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header('Content-Type: image/jpeg');
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imagejpeg($target_image);
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imagedestroy($source_image);
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imagedestroy($target_image);
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imagedestroy($cropped_image);
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}
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(责任编辑:最模板) |