How to draw flat topped hex (title) image in PHP? - php

Question

I am trying to draw a hex using PHP. I have been trying to follow the manual from http://www.redblobgames.com/grids/hexagons/ supporting myself with leland hex generation class (https://github.com/pushcx/leland/blob/master/class_hex_image.php).
Unluckily my "hex" looks like this:
Can you please advice what am I doing wrong or tell me how can I create a proper hex?
It seems to me that function which grabs hex corners does not work correctly:
function hex_corners($center, $size)
{
$points = array();
for($i=0; $i <= 5; $i++)
{
$deg = 60 * $i; // Oblicz kąt, w którym znajduje sie róg hexu
$rad = pi() / 180 * $deg; // Przelicz kąt na radiany
$points[$i] = array_push($points, $center['x'] + $this->size / 2 * cos($rad), $center['y'] + $this->size / 2 * sin($rad));
}
return($points);
}
but I have tried to mimic the one described in http://www.redblobgames.com/grids/hexagons/ manual:
function hex_corner(center, size, i):
var angle_deg = 60 * i
var angle_rad = PI / 180 * angle_deg
return Point(center.x + size * cos(angle_rad),
center.y + size * sin(angle_rad))
I am using the following draw function:
public function hex_draw($x, $y)
{
$this->hex = imagecreatetruecolor ($this->size , $this->size);
$center['x'] = $this->size / 2;
$center['y'] = $this->size / 2;
$blue = imagecolorallocate($this->hex, 0, 0, 255);
// Get points
$points = $this->hex_corners($center, $this->size);
//die($print_r($points);
imagefilledpolygon($this->hex, $points, count($points)/2, $blue);
// flush image
header('Content-type: image/png');
imagepng($this->hex);
imagedestroy($this->hex);
}

Answer 1

My error was trivial.
In line
$points[$i] = array_push($points, $center['x'] + $this->size / 2 * cos($rad), $center['y'] + $this->size / 2 * sin($rad));
there was unneeded [$i] which caused problems.
Hex may be properly generated using the following code:
<?php
class hexmapimage
{
private $size = 100;
private $hex;
public function hex_draw($x, $y)
{
$this->hex = imagecreatetruecolor ($this->size , $this->size);
$center['x'] = $this->size / 2;
$center['y'] = $this->size / 2;
$black = imagecolorallocate($this->hex, 0, 0, 0);
$blue = imagecolorallocate($this->hex, 0, 0, 255);
$transparent = imagecolortransparent ($this->hex, $black);
// Get points
$points = $this->hex_corners($center, $this->size);
imagefilledrectangle($this->hex, 0, 0, $this->size, $this->size, $transparent);
imagefilledpolygon($this->hex, $points, count($points)/2, $blue);
// flush image
header('Content-type: image/png');
imagepng($this->hex);
imagedestroy($this->hex);
}
/*
* $center = array(x coordinate of center of hex, y coordinate of center of hex)
* $size = int (size of hex)
*/
function hex_corners($center, $size)
{
$points = array();
for($i=0; $i <= 5; $i++)
{
$deg = 60 * $i; // Oblicz kąt, w którym znajduje sie róg hexu
$rad = deg2rad($deg); // Przelicz kąt na radiany
array_push($points, $center['x'] + $this->size / 2 * cos($rad), $center['y'] + $this->size / 2 * sin($rad));
}
return($points);
}
}
$hex = new hexmapimage();
$hex->hex_draw(0, 0);