Php method for drawing an arc

This article mainly introduces the php method of drawing an arc, which mainly involves the use of imagearc in the GD Library. if you need it, you can refer to the example below to illustrate the php method of drawing an arc. Share it with you for your reference. The details are as follows:

An arc is equivalent to intercepting a part of an ellipse. The code is as follows:

The code is as follows:

<? Php
// 1. create a canvas
$ Im = imagecreatetruecolor (300,200); // create a real-color image. the default background is black and the image identifier is returned. Another function, imagecreate, is not recommended.
// 2. draw the desired image
$ Red = imagecolorallocate ($ im, 255, 0, 0); // create a color for use
Imagearc ($ im, 0,120, $ red); // draw an arc (an elliptical or circular is a special arc ). The parameter is equivalent to intercepting a part of an elliptical/circular shape. (0,120) indicates the center point; () indicates the width and height of the (elliptical); (): 0 indicates the start point, the center point is horizontal to the right line, intersection with the arc, is 0. 120 indicates that the clockwise rotation starts from the starting point to 120 degrees (Special: when it is 360, it is equivalent to turning a circle to get a circle ).
// 3. output image
Header ("content-type: image/png ");
Imagepng ($ im); // output to the page. If the second parameter [, $ filename] exists, the image is saved.
// 4. destroy images and release memory
Imagedestroy ($ im );
?>

I hope this article will help you with php programming.