moodle_local_treestudyplan/classes/local/randomimage.php
2024-02-02 23:09:16 +01:00

174 lines
4.7 KiB
PHP

<?php
// This file is part of the Studyplan plugin for Moodle
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <https://www.gnu.org/licenses/>.
/**
* Generate random grades and feedback to initialize development environment
* @package local_treestudyplan
* @copyright 2023 P.M. Kuipers - Chris Zuber
* @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace local_treestudyplan\local;
use Exception;
/**
* Generate random grades and feedback to initialize development environment
*/
class randomimage {
/**
* Image width
* @var integer
*/
private $width;
/**
* Image height
* @var integer
*/
private $height ;
/**
* Number of shapes to draw
* @var integer
*/
private $shapes;
/**
* Image name
* @var string
*/
public $name;
/**
* Image temporary file
* @var string
*/
public $tempfile;
/**
* Various available styles for arcs
* @var Arary
*/
const ARC_STYLES = [
IMG_ARC_PIE,
IMG_ARC_CHORD,
IMG_ARC_EDGED,
IMG_ARC_NOFILL
];
/**
* Create a random polygon with number of points between 0 & $max_pts
* @param \GdImage $im The image reource
* @param integer $max_pts Max number of point to use
* @return void
*/
private function random_polygon($im, Int $max_pts = 20)
{
$color = imagecolorallocatealpha($im, ...$this->random_color_alpha());
$pts = $this->random_pts(\random_int(3, $max_pts));
imagefilledpolygon($im, $pts, $color);
}
/**
* Creates a random arc of a random color
* @param \GdImage $im The image resource
* @return void
*/
private function random_arc($im)
{
$cx = \random_int(0, $this->width);
$cy = \random_int(0, $this->height);
$w = \random_int(0, $this->width);
$h = \random_int(0, $this->height);
$s = \random_int(0, 360);
$e = \random_int(0, 360);
$col = imagecolorallocatealpha($im, ...$this->random_color_alpha());
$style = self::ARC_STYLES[\random_int(0, 3)];
imagefilledarc($im, $cx, $cy, $w, $h, $s, $e, $col, $style);
}
/**
* Generates an array of random alpha color values.
* @return Array [r, g, b, a]
*/
private function random_color_alpha(): Array
{
return [
\random_int(0, 255),
\random_int(0, 255),
\random_int(0, 255),
\random_int(0, 127)
];
}
/**
* Generates a set of random points for a polygon [x1,y1, x2,y2,...]
* @param integer $length Number of sets of points to generate
* @return Array The resulting array of points
*/
private function random_pts($length): Array
{
$pts = [];
for($n = 0; $n < $length; $n++) {
$pts[] = \random_int(0, $this->width);
$pts[] = \random_int(0, $this->height);
}
return $pts;
}
public function __construct($shapes=3,$width=256,$height=256) {
$this->shapes = $shapes;
$this->width = $width;
$this->height = $height;
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$string = '';
for ($i = 0; $i < 20; $i++) {
$string .= $characters[\mt_rand(0, strlen($characters) - 1)];
}
$this->name = $string.".png";
$im = imagecreatetruecolor($this->width, $this->height);
for ($i = 0; $i < $this->shapes; $i++) {
switch(\random_int(1, 2)) {
case 1:
$this->random_arc($im);
break;
case 2:
$this->random_polygon($im);
break;
}
}
$this->tempfile = \tempnam("/tmp","tsp");
imagepng($im,$this->tempfile);
imagedestroy($im);
}
public function content() {
return $this->content = \file_get_contents($this->tempfile);
}
public function __destruct()
{
if (isset($this->tempfile) && file_exists($this->tempfile)) {
unlink($this->tempfile);
}
}
}