php editor Xiaoxin teaches you how to draw polygons using PHP language. Through PHP's graphics library functions, we can easily implement the function of drawing various shapes, including polygons. This article will introduce how to use PHP to create a polygon, and explore polygon drawing methods with different numbers of sides to help you display various colorful graphic effects on web pages. Let's learn how to draw polygons through PHP!
Drawing polygons in PHP
Introduction
A polygon is a closed geometric shape with multiple straight sides. In php, polygons can be drawn by using the image processing functions of the GD library.
Draw polygon
To draw a polygon, follow these steps:
imagecreate()
function to create a new image canvas. imagesetsize()
function to set the width and height of the canvas. imagecolorallocate()
function to assign the color to be used for the polygon. imagepoly<strong class="keylink">Go</strong>n()
function to draw the path of the polygon. This function accepts the following parameters: imagefill()
function. imagepng()
, imagejpeg()
or imagegif()
function to output the image to the browser or Save to file. Sample code
The following is a sample code for drawing a triangle:
<?php //Create image canvas $image = imagecreate(400, 300); //Set canvas size imagesetsize($image, 400, 300); // assign color $color = imagecolorallocate($image, 0, 0, 255); // Draw polygon path $points = array(100, 100, 250, 200, 150, 250); imagepolygon($image, $points, 3); //output image imagepng($image); // Release the image canvas imagedestroy($image); ?>
Advanced Technology
In addition to drawing simple polygons, you can also use advanced techniques in PHP to create more complex polygons:
imagecopy()
function to create complex images with multiple polygons. XMLWriter
class in PHP can be used to create SVG graphics. The above is the detailed content of PHP draws a polygon. For more information, please follow other related articles on the PHP Chinese website!