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(PECL imagick 2.0.0)
ImagickDraw::setStrokeAlpha — Specifies the opacity of stroked object outlines
$opacity 
   )本函数还未编写文档,仅有参数列表。
Specifies the opacity of stroked object outlines.
opacity opacity
没有返回值。
Example #1 ImagickDraw::setStrokeAlpha()
  <?php
 function  setStrokeAlpha ( $strokeColor ,  $fillColor ,  $backgroundColor ) {
     $draw  = new \ ImagickDraw ();
     $draw -> setStrokeColor ( $strokeColor );
     $draw -> setFillColor ( $fillColor );
     $draw -> setStrokeWidth ( 4 );
     $draw -> line ( 100 ,  100 ,  400 ,  145 );
     $draw -> rectangle ( 100 ,  200 ,  225 ,  350 );
     $draw -> setStrokeOpacity ( 0.1 );
     $draw -> line ( 100 ,  120 ,  400 ,  165 );
     $draw -> rectangle ( 275 ,  200 ,  400 ,  350 );
     $image  = new \ Imagick ();
     $image -> newImage ( 500 ,  400 ,  $backgroundColor );
     $image -> setImageFormat ( "png" );
     $image -> drawImage ( $draw );
     header ( "Content-Type: image/png" );
    echo  $image -> getImageBlob ();
}
 ?>   [#1] Thomas [2014-09-19 12:30:30]
Must be set after setStrokeColor().
Values between 0 (invisible) and 1.