The GmagickDraw ::setfillopacity() function is an inbuilt function in PHP which is used to set the opacity of a drawing image. It is used when drawing the image using the filled color or filled texture. Syntax:
public GmagickDraw::setfillopacity( $fill_opacity ) : GmagickDraw
Parameters: This function accepts single parameter $fill_opacity which is used to hold the value of the opacity as float type. Return Value: This function returns the GmagickDraw object on success. Below programs illustrates the GmagickDraw::setfillopacity() function in PHP: Program 1:
php
<?php// require_once('vendor/autoload.php'); // Create GmagickDraw object$draw = new \GmagickDraw ();// Set the stroke color$draw->setStrokeColor('Green'); // Use setFillColor() Function$draw->setFillColor('Red'); // Use setFillOpacity() Function $draw->setFillOpacity(0.2); $draw->setStrokeWidth(7); // Create rectangle$draw->rectangle(40, 30, 200, 260); // Use setFillColor() Function$draw->setFillColor('Red');// Create rectangle of given size$draw->rectangle(260, 30, 400, 260); // Create an Gmagick object$image = new \Gmagick (); $image->newImage(500, 300, 'white');// Set the image format$image->setImageFormat("png"); // Render the draw commands in the // GmagickDraw object into the image.$image->drawImage($draw); // Send the image to the browserheader("Content-Type: image/png");echo $image->getImageBlob(); ?> |
Output: 
Program 2:
php
<?php// require_once('path/vendor/autoload.php'); // Create new GmagickDraw object$draw = new \GmagickDraw (); // Set the stroke color$strokeColor = new \GmagickPixel('Green');// Set the filled color$fillColor = new \GmagickPixel('Red');// Set the stroke color$draw->setStrokeColor('Green');// Set the filled color$draw->setFillColor('Red'); // Use setFillOpacity() Function$draw->setFillOpacity(0.5);// Set the stroke width$draw->setStrokeWidth(2); $smoothPointsSet = [ [ ['x' => 10.0 * 5, 'y' => 10.0 * 5], ['x' => 30.0 * 5, 'y' => 90.0 * 5], ['x' => 25.0 * 5, 'y' => 10.0 * 5], ['x' => 50.0 * 5, 'y' => 50.0 * 5], ] ]; foreach ($smoothPointsSet as $points) { $draw->bezier($points);}// Create an image object$gmagick = new \Gmagick ();$gmagick->newImage(300, 300, 'White');// Set the image format$gmagick->setImageFormat("png"); // Render the draw commands in the// GmagickDraw object into the image.$gmagick->drawImage($draw); // Send the image to the browserheader("Content-Type: image/png");echo $gmagick->getImageBlob();?> |
Output: 
Reference: http://php.net/manual/en/gmagickdraw.setfillopacity.php
