PHP | GmagickDraw setstrokeopacity() Function

The GmagickDraw::setstrokeopacity() function is an inbuilt function in PHP that is used to specify the opacity of stroked object outlines. The value of opacity lies between 0 and 1.

Syntax:

public GmagickDraw::setstrokeopacity( $stroke_opacity ) : GmagickDraw

Parameters: This function accepts a single parameter $stroke_opacity which is used to hold the value of stroke opacity as float type.
Return Value: This function returns the GmagickDraw object on success.
Below programs illustrate the GmagickDraw::setstrokeopacity() function in PHP:
Program 1:

php

<?php

// require_once('path/vendor/autoload.php');

// Create an GmagickDraw object to draw into.
$draw = new \GmagickDraw();

// Set the stroke color
$draw->setStrokeColor('Green');

// Set the filled color
$draw->setFillColor('Red');

// Set the stroke opacity
$draw->setStrokeOpacity(0.5);

// Set the stroke width
$draw->setStrokeWidth(9);

// Draw the rectangle
$draw->rectangle(40, 30, 200, 260);

// Create new gmagick object
$image = new \Gmagick();

// Create new image of given size
$image->newImage(240, 300, 'White');

// Set the image format
$image->setImageFormat("png");

// Draw the image
$image->drawImage($draw);

header("Content-Type: image/png");

// Display the output image
echo $image->getImageBlob();
?>

Output:

Program 2:

php

<?php

// require_once('path/vendor/autoload.php');

// Create an GmagickDraw object to draw into.
$draw = new \GmagickDraw();

// Set the Stroke Color
$draw->setStrokeColor('Black');

// Set the Stroke Opacity
$draw->setStrokeOpacity(0.6);

// Set the Stroke Width
$draw->setStrokeWidth(4);

//Set the filled color
$draw->setFillColor('lightgreen');
$points = [
        ['x' => 50 * 6, 'y' => 10 * 5],
        ['x' => 20 * 7, 'y' => 30 * 5],
        ['x' => 60 * 8, 'y' => 50 * 5],
        ['x' => 70 * 3, 'y' => 15 * 5],
    ];

// Draw the polygon
$draw->polygon($points);

// Create new Gmagick object
$image = new \Gmagick();

// Set the image dimensions
$image->newImage(500, 300, 'white');

// Set the image format
$image->setImageFormat("png");

// Draw the image
$image->drawImage($draw);

header("Content-Type: image/png");

// Display the image
echo $image->getImageBlob();
?>

Output:

Reference: http://php.net/manual/en/gmagickdraw.setstrokeopacity.php