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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

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<?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();
?>

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Output:

Program 2: Drawing from scratch

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<?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();
?>

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Output:

Reference: https://www.php.net/manual/en/gmagickdraw.polyline.php

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