PHP | GmagickDraw polyline() Function

Last Updated : 30 Jan, 2020
The GmagickDraw::polyline() function is an inbuilt function in PHP which is used to draw a polyline using the current stroke, stroke width, and fill color or texture, using the specified array of coordinates. Syntax: 
GmagickDraw GmagickDraw::polyline( array $coordinates_array )
Parameters: This function accepts a single parameter $coordinates_array which is used to hold the coordinates of the point as an array. Return Value: This function returns GmagickDraw object on success. Exceptions: This function throws GmagickDrawException on error. Used Image: Below examples illustrate the GmagickDraw::polyline() function in PHP: Program 1: Drawing over an image php 
<?php

// Create a new Gmagick object
$gmagick = new Gmagick('geeksforgeeks.png');

// Create a GmagickDraw object
$draw = new GmagickDraw();

// Set the fill color
$draw->setFillColor('#0E0E0E');

// Set the stroke color
$draw->setstrokecolor('green');

// Set the stroke width
$draw->setStrokeWidth(5);

// Create a polygonline
$draw->polyline([
    ['x' => 100, 'y' => 50],
    ['x' => 40, 'y' => 150],
    ['x' => 480, 'y' => 150],
    ['x' => 110, 'y' => 75],
]);

// Use of drawimage function
$gmagick->drawImage($draw);

// Display the output image
header("Content-Type: image/png");
echo $gmagick->getImageBlob();
?>
Output: Program 2: Drawing from scratch php 
<?php

// Create a new Gmagick object
$gmagick = new Gmagick('geeksforgeeks.png');

// Create a GmagickDraw object
$draw = new GmagickDraw();

// Draw rectangle for background
$draw->rectangle(-10, -10, 800, 400);

// Set the fill color
$draw->setFillColor('white');

// Set the stroke color
$draw->setstrokecolor('red');

// Set the stroke width
$draw->setStrokeWidth(5);

// Create a polygonline
$draw->polyline([
    ['x' => 400, 'y' => 0],
    ['x' => 40, 'y' => 170],
    ['x' => 480, 'y' => 150],
    ['x' => 110, 'y' => 5],
]);

// Use of drawimage function
$gmagick->drawImage($draw);

// Display the output image
header("Content-Type: image/png");
echo $gmagick->getImageBlob();
?>
Output: Reference: https://www.php.net/manual/en/gmagickdraw.polyline.php
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