PHP Draw round method, PHP draw round method _php Tutorial

PHP Draw Circle Method, PHP draw round method

This example describes how PHP draws a circle. Share to everyone for your reference. The implementation method is as follows:

PHP Drawing Basic Steps , there are four steps (php.ini in the extension = Php_gb2.dll component first need to enable)

1, create the canvas;

2. Draw the desired image (circle, line, rectangle, fan, arc ...). ）；

3, output to the Web page, or save;

4, destroy the picture (the purpose is to release the memory occupied by the image).

Three most commonly used image formats for Web development: GIF, JPG/JPEG, PNG

(1) GIF format: The compression rate is the highest, but only 256 colors can be displayed, may cause the loss of color. Advantage: The animated image may be displayed.

(2) Jpg/jpeg format: Compression rate is also relatively high (lossy compression, will also lose some color), the use of more pages.

(3) PNG format: Combines the advantages of GIF and JPG, it cannot display animated images. High fidelity, support lossless compression, color preservation of the best, relatively speaking, than Jpg/jpeg to a little larger.

PHP Draws a circle with the following code:
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
Imageellipse ($im, 30,30,40,40, $red);//Draw a circle. Parameter description: The 30,30 is the center coordinate of the circle, the 40,40 is the width and height, the ellipse is different; the $red is a circle color (box color)
3. Output image
Header ("Content-type:image/png");
Imagepng ($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.

http://www.bkjia.com/PHPjc/947214.html www.bkjia.com true http://www.bkjia.com/PHPjc/947214.html techarticle PHP Draw round method , PHP Draw Circle Method This article describes the way PHP draws a circle. Share to everyone for your reference. The implementation method is as follows: PHP drawing basic Steps ...

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