PHP Draw an arc method, PHP draw arc _php Tutorial

PHP draws an arc method, PHP draws an arc

This example describes how PHP draws an arc. Share to everyone for your reference. Specific as follows:

The arc is equivalent to intercepting part of the ellipse. The code is as follows:
Copy the Code code as follows: <?php
1. Create a canvas
$im = Imagecreatetruecolor (300,200);//Create a new true color image, the default background is black, return the image identifier. There is also a function imagecreate has not been recommended for use.
2. Draw the desired image
$red = Imagecolorallocate ($im, 255,0,0);//Create a color for use
Imagearc ($im, 100,80,120,90,0,120, $red);//Draw an arc (ellipse or circle is a special arc). The parameter is understood, which is equivalent to intercepting the ellipse/circle part. (100,80) represents the center point; (120,90) represents (ellipse) width and height, (0,120): 0 is the starting point, the center point is horizontal to the right, and the intersection of the arc is 0 points. 120 means starting from the beginning, clockwise to 120 degrees (Special: When 360, the equivalent of a circle, to get a circle).
3. Output image
Header ("Content-type:image/png");
Imagepng ($im);//output to page. If there is a second argument [, $filename], the image is saved
4. Destroy the image and release the memory
Imagedestroy ($im);
?>

I hope this article is helpful to everyone's PHP programming.

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