PHP实现根据图片色界在不同位置加水印的方法

<?php
 function add_wm($nmw_water, $src_file, $output_file, $x, $y) {
 if(file_exists($output_file))
 return;
 $w1 = MagickGetImageWidth($nmw_water);
 $h1 = MagickGetImageHeight($nmw_water);
 $nmw =NewMagickWand();
 MagickReadImage($nmw, $src_file);
 // 默认的加水印位置调整
 $lt_w = 50;
 $lt_h = 50;
 if($x == 0){
 $w = MagickGetImageWidth($nmw);
 $h = MagickGetImageHeight($nmw);
 $x = $w;
 $y = $h;
 }else{
 // 根据具体情况调整
 $lt_w = 30;
 $lt_h = 40;
 }
 MagickCompositeImage($nmw, $nmw_water, MW_OverCompositeOp, $x - $w1 - $lt_w, $y - $h1 - $lt_h);
 MagickWriteImage($nmw, $output_file);
 DestroyMagickWand($nmw);
 }
 // 还是groovy的eachFileRecurse好用啊
 function add_wm_recurse($nmw_water, $to_dir, $output_dir, $arr) {
 $dp = dir($to_dir);
 while($file=$dp->read()){
 if($file != '.' && $file != '..'){
 if(is_dir($to_dir . '/' . $file)){
  mkdir($output_dir . '/' . $file);
  add_wm_recurse($nmw_water, $to_dir . '/' . $file, $output_dir . '/' . $file, $arr);
 }else{
  if(!array_key_exists($to_dir . '/' . $file, $arr)){
  continue;
  }
  $sub_arr = $arr[$to_dir . '/' . $file];
  if($sub_arr){
  $x = intval($sub_arr[0]);
  $y = intval($sub_arr[1]);
  add_wm($nmw_water, $to_dir . '/' . $file, $output_dir . '/' . $file, $x, $y);
  }
 }
 }
 }
 $dp->close();
 }
 $to_dir = './resized';
 $output_dir = './output';
 // 这个是我用java的ImageIO遍历图片像素获取的符合裤子颜色的区域的坐标array(posX, posY)
 $arr = array(
 array(50, 50)
 );
 $water = './water.png';
 $nmw_water =NewMagickWand();
 MagickReadImage($nmw_water, $water);
 add_wm_recurse($nmw_water, $to_dir, $output_dir, $arr);
 DestroyMagickWand($nmw_water);
?>

$magick_wand=NewMagickWand();
MagickReadImage($magick_wand,'rose.jpg');
$drawing_wand=NewDrawingWand();
DrawSetFont($drawing_wand,"/usr/share/fonts/bitstream-vera/Vera.ttf");
DrawSetFontSize($drawing_wand,20);
DrawSetGravity($drawing_wand,MW_CenterGravity);
$pixel_wand=NewPixelWand();
PixelSetColor($pixel_wand,"white");
DrawSetFillColor($drawing_wand,$pixel_wand);
if (MagickAnnotateImage($magick_wand,$drawing_wand,0,0,0,"Rose") != 0)
{
 MagickEchoImageBlob( $magick_wand );
}
else
{
 echo MagickGetExceptionString($magick_wand);
}
?>