PHP | ImagickDraw setStrokeAlpha() Function

Last Updated : 30 Aug, 2019

The ImagickDraw::setStrokeAlpha() function is an inbuilt function in PHP which is used to specify the opacity of stroked object outlines. Syntax:

bool ImagickDraw::setStrokeAlpha( $opacity )

Parameters: This function accepts a single parameter opacity which is used to specify the transparency of stroke object. It is the float value and lies between 0 and 1. Return Value: This function does not returns any value. Below programs illustrates the ImagickDraw::setStrokeAlpha() function in PHP: Program 1:

php

<?php
 
// require_once('path/vendor/autoload.php');
 
// Create an Imagick Draw object
$draw = new \ImagickDraw();
 
// Set the stroke color
$strokeColor = new \ImagickPixel('Green');
 
// Set the fill color
$fillColor = new \ImagickPixel('Red');
 
// Set the stroke color
$draw->setStrokeColor('Green');
 
// Set the Fill Color
$draw->setFillColor('Red');
 
// Set the stroke width
$draw->setStrokeWidth(5);

// Set the stroke opacity
$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 an imagick object
$imagick = new \Imagick();
 
// Set the image dimensions
$imagick->newImage(300, 300, 'White');
 
// Set the image format
$imagick->setImageFormat("png");
 
// Draw the image
$imagick->drawImage($draw);
header("Content-Type: image/png");
 
// Display the image
echo $imagick->getImageBlob();
?>

Output:

Program 2:

php

<?php

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

// Create an ImagickDraw object

$draw = new \ImagickDraw();

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

// Set the Fill Color
$draw->setFillColor('Red');

// Set the stroke width
$draw->setStrokeWidth(7);

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

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

// Create an Imagick object 
$image = new \Imagick();

// Set the image dimensions
$image->newImage(250, 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();
?>