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Porady zamieszczone tutaj przez Darka są pomocne w wielu chwilach. Wielokrotnie tworząc jakiś złożony serwis korzystam z tych porad. Można by tworzyć samemu te skrypty, ale tak naprawdę czy nie lepiej jest wziąć skrypt z tej strony i zmodyfikowac go dla swoich potrzeb? Wprawdzie możemy taki skrypt napisać sami, ale po co, skoro stracimy czas na coś, co ktoś juz napisał, przetestował i może zagwarantować, że działa poprawnie. Któryś raz z rzędu opłacam abonament i nie raz jeszcze opłacę. Kawał dobrej roboty i ogrom wiedzy w jednym miejscu.
Piotr Karamański
Design Studio
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PODRĘCZNIK PHP 5.x, 4.x, 3.x - częściowo spolszczony / źródło: www.php.net
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imagepolygon (PHP 3, PHP 4, PHP 5) imagepolygon -- Draw a polygon Descriptionint imagepolygon ( resource image, array points, int num_points, int color )
imagepolygon() creates a polygon in image id.
points is a PHP array containing the
polygon's vertices, i.e. points[0] = x0, points[1] = y0, points[2]
= x1, points[3] = y1, etc. num_points is
the total number of points (vertices).
Przykład 1. imagepolygon() example |
<?php
$image = imagecreate(400, 300);
$bg = imagecolorallocate($image, 0, 0, 0);
$col_poly = imagecolorallocate($image, 255, 255, 255);
imagepolygon($image,
array (
0, 0,
100, 200,
300, 200
),
3,
$col_poly);
header("Content-type: image/png");
imagepng($image);
?>
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See also imagecreate() and
imagecreatetruecolor().
User Contributed Notesglowell at flash dot net
18-Nov-2005 12:43
Something to be aware of, ImagePolygon appears to convert the array of points passed to it from whatever format they may have been in originally into integers. This means if you pass it an array of floats (after running a rotation routine for example) the floats will be changed to integers INSIDE THE ORIGINAL ARRAY.
An extreme example: if for some reason you had an unit-sized polygon pt-array ( -1<x|y<1 for easy scaling purpose for instance) and for some reason your code calls imagepolygon on it (why? it'd only be a dot anyway) the array would be unusable after that (all either 1s, 0s or -1s). Scaling a unit-sized array, drawing it and then scaling it again will also may have a different result than expected.
Obviously, if the array in its original state is important to your code, it should use a copy of the original array for this call. If your code draws the same polygon multiple times but resizes it for different cases, you should have each size be created off an original template rather than adjusting a single polygon array.
jsnell at networkninja dot com
18-Feb-2001 04:07
Here are some handy routines for rotation and translation of polygons. Scaling could be added easily as well.
function translate_point(&$x,&$y,$angle,$about_x,$about_y,$shift_x,$shift_y)
{
$x -= $about_x;
$y -= $about_y;
$angle = ($angle / 180) * M_PI;
/* math:
[x2,y2] = [x, * [[cos(a),-sin(a)],
y] [sin(a),cos(a)]]
==>
x = x * cos(a) + y*sin(a)
y = x*-sin(a) + y*cos(a)
*/
$new_x = $x * cos($angle) - $y * sin($angle);
$new_y = $x * sin($angle) + $y * cos($angle);
$x = $new_x+ $about_x + $shift_x ;
$y = $new_y + $about_y + $shift_y;
}
function translate_poly($point_array, $angle, $about_x, $about_y,$shift_x,$shift_y)
{
$translated_poly = Array();
while(count($point_array) > 1)
{
$temp_x = array_shift($point_array);
$temp_y = array_shift($point_array);
translate_point($temp_x, $temp_y, $angle, $about_x, $about_y,$shift_x, $shift_y);
array_push($translated_poly, $temp_x);
array_push($translated_poly, $temp_y);
}
return $translated_poly;
}
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