What is PhpDig?
PhpDig is a PHP MySQL based
Web Spider & Search Engine.
imagepolygon — Draws an unfilled polygon.
string imagepolygon(image, points, vertices, color);
int image: Image
array points: Array of
int vertices: Number of
int color: Specified
TRUE on success; FALSE on error
This can be a difficult function to understand and use.
The array specifying the drawing coordinates must contain
both the x and y coordinates of each point in the
polygon. For example,
that the first point is at (100,100), the second at
(125,125), and so on. The polygon must have at least
three vertices for the function to work; a good way to
determine the number of vertices is to count the array
using count() and
divide by two. A point is made up of two values. If you
used user input to assign the polygon points, you can use
the modulus operator (%) to determine whether an even
number of values were given.
Example 431. Create an
unfilled red polygon
$im = imagecreate(200, 200);
$green = imagecolorallocate($im, 0, 255, 0);
$red = imagecolorallocate($im, 255, 0, 0);
$points = array(100, 10, 150, 50, 160, 80, 10, 150, 100, 10);
$vertices = count($points) / 2;
imagepolygon($im, $points, $vertices, $red);
PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing
(Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch).
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