[php]
$dinfo['height'] || $winfo['width'] > $dinfo['width']) {
return false;
}
// 两张图,读到画布上! 但是图片可能是png,可能是jpeg,用什么函数读?
$dfunc = 'imagecreatefrom' . $dinfo['ext'];
$wfunc = 'imagecreatefrom' . $winfo['ext'];
if (!function_exists($dfunc) || !function_exists($wfunc)) {
return false;
} www.2cto.com
// 动态加载函数来创建画布
$dim = $dfunc($dst);
// 创建待操作的画布
$wim = $wfunc($water);
// 创建水印画布
// 根据水印的位置 计算粘贴的坐标
switch($pos) {
case 0 :
// 左上角
$posx = 0;
$posy = 0;
break;
case 1 :
// 右上角
$posx = $dinfo['width'] - $winfo['width'];
$posy = 0;
break;
case 3 :
// 左下角
$posx = 0;
$posy = $dinfo['height'] - $winfo['height'];
break;
default :
$posx = $dinfo['width'] - $winfo['width'];
$posy = $dinfo['height'] - $winfo['height'];
}
// 加水印
imagecopymerge($dim, $wim, $posx, $posy, 0, 0, $winfo['width'], $winfo['height'], $alpha);
// 保存
if (!$save) {
$save = $dst;
unlink($dst);
// 删除原图
}
$createfunc = 'image' . $dinfo['ext'];
$createfunc($dim, $save);
imagedestroy($dim);
imagedestroy($wim);
return true;
}
/**
thumb 生成缩略图
等比例缩放,两边留白
**/
public static function thumb($dst, $save = null, $width = 200, $height = 200) {
// 首先判断待处理的图片存不存在
$dinfo = self::imageinfo($dst);
if ($dinfo == false) {
return false;
}
// 计算缩放比例
$calc = min($width / $dinfo['width'], $height / $dinfo['height']);
// 创建原始图的画布
$dfunc = 'imagecreatefrom' . $dinfo['ext'];
$dim = $dfunc($dst);
// 创建缩略画布
$tim = imagecreatetruecolor($width, $height);
// 创建白色填充缩略画布
$white = imagecolorallocate($tim, 255, 255, 255);
// 填充缩略画布
imagefill($tim, 0, 0, $white);
// 复制并缩略
$dwidth = (int)$dinfo['width'] * $calc;
$dheight = (int)$dinfo['height'] * $calc;
$paddingx = (int)($width - $dwidth) / 2;
$paddingy = (int)($height - $dheight) / 2;
imagecopyresampled($tim, $dim, $paddingx, $paddingy, 0, 0, $dwidth, $dheight, $dinfo['width'], $dinfo['height']);
// 保存图片
if (!$save) {
$save = $dst;
unlink($dst);
}
$createfunc = 'image' . $dinfo['ext'];
$createfunc($tim, $save);
imagedestroy($dim);
imagedestroy($tim);
return true;
}
}
// print_r(imagetool::imageinfo('./home.jpg'));
/* www.2cto.com
echo imagetool::water('./home.jpg','./smallfeng.png','home1.jpg',0)?'ok':'fail';
echo imagetool::water('./home.jpg','./smallfeng.png','home2.jpg',1)?'ok':'fail';
echo imagetool::water('./home.jpg','./smallfeng.png','home3.jpg',2)?'ok':'fail';
echo imagetool::water('./home.jpg','./smallfeng.png','home4.jpg',3)?'ok':'fail';
*/
http://www.bkjia.com/phpjc/477858.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/477858.htmltecharticle这个一个简单的gd库操作 [php] ?php /**** 燕十八 公益php讲堂 论 坛: http://www.zixue.it 微 博: http://weibo.com/yshiba yy频道: 88354001 ****/ /*** 想操作图片...