Syntax:

bool ImagickDraw::setStrokeAlpha ($opacity)

Parameters: This function takes opacity one parameter, which is used to specify the transparency of the stroke object. This is a floating point value, it ranges from 0 to 1.Returned value:This function does not return any value.The following programs illustrate function ImagickDraw::setStrokeAlpha()in PHP:Program 1:  
// require_once (` path / vendor / autoload.php `); 
// Create Imagick Draw object $draw = new ImagickDraw();  
// Set stroke color $strokeColor = new ImagickPixel ( `Green` );  
// Set the fill color $fillColor = new ImagickPixel ( `Red` );  
// Set stroke color $draw -> setStrokeColor ( `Green` );  
// Set fill color $draw -> setFillColor ( `Red` );  
// Set the stroke width $draw -> setStrokeWidth (5);  
// Set the opacity of the stroke $draw -> setStrokeOpacity (0.5); $smoothPointsSet = [ [[ `x` = > 10.0 * 5, `y` = > 10.0 * 5], [ `x` = > 30.0 * 5, `y` = > 90.0 * 5], [ `x` = > 25.0 * 5, `y` = > 10.0 * 5], [ `x` = > 50.0 * 5, `y` = > 50.0 * 5],] ]; foreach ( $smoothPointsSet as $points ) { $draw -> bezier ( $points ); }  
// Create imagick object $imagick = new Imagick();  
// Set image dimensions $imagick -> newImage (300, 300, `White` );  
// Set image format $imagick -> setImageFormat ( "png" );  
// Draw image $imagick -> drawImage ( $draw ); header ( "Content-Type: image / png" );  
// Show image echo $imagick -> getImageBlob(); ?> Output: Program 2: < tbody>  
// require_once (` path / vendor / autoload.php `); 
// Create an ImagickDraw object  $draw = new ImagickDraw();  
// Set the stroke color $draw -> setStrokeColor ( `Green` );  
// Set fill color $draw -> setFillColor ( `Red` );  
// Set the stroke width $draw -> setStrokeWidth (7);  
// Set the opacity of the stroke $draw -> setStrokeOpacity (0.5);  
// Draw a rectangle $draw -> rectangle (40, 30, 200, 260);  
// Create an Imagick object $image = new Imagick();  
// Set image dimensions $image -> newImage (250, 300, `White` );  
// Set image format $image -> setImageFormat ( "png" );  
// Draw image $image -> drawImage ( $draw ); header ( "Content-Type: image / png" );  
// Show image echo $image -> getImageBlob(); ?> Output: Link : http://php.net/manual/en/imagickdraw.setstrokealpha.php