output.png

imageSmoothArc.php

BresenhamCircleAA.php

<div>
The code cries out for refactoring, but the results are wonderful, and a perfect example of why E-E is a great place to post question, share ideas and learn as a community! &nbsp;+1 for <a href="https://www.experts-exchange.com/members/robert_schutt.html" rel="ugc">Robert</a>!
</div>

<div>
Wow thanks Ray, that's high praise coming from you! Of course it depends greatly on the work of those who made the anti-aliasing code. I was actually anticipating the question to make it into a class for easy re-use etc but don't have much experience with that. I'll post my efforts here anyway, maybe you can add some 'class' to it ;-) 

<pre><code class="code-100 nolinks" id="code-20-41515092-1">&lt;?

// http://www.ulrichmierendorff.com/software/antialiased_arcs.html
include (&quot;./imageSmoothArc.php&quot;);

// bresenham aa circle, adapted from http://members.chello.at/easyfilter/Bresenham.pdf
include (&quot;./BresenhamCircleAA.php&quot;);

class RadialPieChart {
 private $w;
 private $h;
 private $e; // explode from center

 public $image;
 private $white;
 private $black;
 private $gray;

 private $data;
 private $labels;
 private $colors;

 private $sz;
 private $cnt;
 private $max;
 private $a;
 private $fw;
 private $fh;

 private $xx;
 private $yy;

 public function __construct($w = 100, $h = 100, $e = 1, $image = null)
 {
 $this-&gt;w = $w;
 $this-&gt;h = $h;
 $this-&gt;e = $e;
 $this-&gt;image = $this-&gt;image != null ? $image : imagecreatetruecolor($w, $h);
 imagealphablending($this-&gt;image, true);
 imageantialias($this-&gt;image, false);

 $this-&gt;white = imagecolorallocate($this-&gt;image, 0xFF, 0xFF, 0xFF);
 $this-&gt;black = imagecolorallocate($this-&gt;image, 0x00, 0x00, 0x00);
 $this-&gt;gray = imagecolorallocate($this-&gt;image, 0xEE, 0xEE, 0xEE);
 }

 function SetData($data = null, $labels = null, $colors = null) {

 $this-&gt;data = $data != null ? $data : [1, 2, 3];
 $this-&gt;labels = $labels != null ? $labels : ['Segment A', 'Segment B', 'Segment C'];
 $this-&gt;colors = $colors != null ? $colors : [imagecolorallocate($this-&gt;image, 0xFF, 0x00, 0x00), imagecolorallocate($this-&gt;image, 0x00, 0xFF, 0x00), imagecolorallocate($this-&gt;image, 0x00, 0x00, 0xFF)];

 $this-&gt;max = max($this-&gt;data);
 $this-&gt;cnt = count($this-&gt;data);
 $this-&gt;a = floor(360 / $this-&gt;cnt);

 $this-&gt;fw = imagefontwidth(4);
 $this-&gt;fh = imagefontheight(4);
 }

 function Draw($xx = null, $yy = null, $w = null, $h = null) {

 $this-&gt;xx = $xx != null ? $xx : 0;
 $this-&gt;yy = $yy != null ? $yy : 0;
 $this-&gt;w = $w != null ? $w : $this-&gt;w;
 $this-&gt;h = $h != null ? $h : $this-&gt;h;

 $this-&gt;sz = min($this-&gt;w, $this-&gt;h) * 0.9;

 imagefilledrectangle($this-&gt;image, $this-&gt;xx, $this-&gt;yy, $this-&gt;xx + $this-&gt;w - 1, $this-&gt;yy + $this-&gt;h - 1, $this-&gt;white);

 for ($i = 0; $i &lt; $this-&gt;cnt; $i++) {
 $x = $this-&gt;xx + $this-&gt;w / 2 + $this-&gt;e * cos(deg2rad(($i + 0.5) * $this-&gt;a - 90));
 $y = $this-&gt;yy + $this-&gt;h / 2 + $this-&gt;e * sin(deg2rad(($i + 0.5) * $this-&gt;a - 90));
 $s = $this-&gt;sz * $this-&gt;data[$i] / 100; // $max
 imagefilledsmootharc($this-&gt;image, $x, $y, $s, $s, $i * $this-&gt;a - 90, ($i + 1) * $this-&gt;a - 90, $this-&gt;colors[$i % count($this-&gt;colors)]); // , IMG_ARC_PIE
 $s = $s / 2 + 10;
 $x = $this-&gt;xx + $this-&gt;w / 2 + $s * cos(deg2rad(($i + 0.5) * $this-&gt;a - 90));
 $y = $this-&gt;yy + $this-&gt;h / 2 + $s * sin(deg2rad(($i + 0.5) * $this-&gt;a - 90));
 if (($i + 0.5) * $this-&gt;a &gt; 180) {
 $x -= $this-&gt;fw * strlen($this-&gt;labels[$i]);
 }
 $y -= $this-&gt;fh * (1 - ($y - $this-&gt;yy) / $this-&gt;h);
 imagestring($this-&gt;image, 4, $x, $y, $this-&gt;labels[$i], $this-&gt;black);
 }

 for ($i = 10; $i &lt;= 100; $i += 10) {
 plotCircleAA($this-&gt;image, $this-&gt;xx + $this-&gt;w / 2, $this-&gt;yy + $this-&gt;h / 2, $this-&gt;sz * $i / 100 / 2 + $this-&gt;e, $this-&gt;gray);
 }
 }

 function Output() {
 header('Content-type: image/png');
 imagepng($this-&gt;image);
 imagedestroy($this-&gt;image);
 }
}

// create chart object

$chart = new RadialPieChart(600, 400, 3);

// data and colors

$data = [36, 43, 49, 58, 60, 52];
$labels = ['Segment A', 'Segment B', 'Segment C', 'Segment D', 'Segment E', 'Segment F'];

$colors = [];
$colors[] = imagecolorallocate($chart-&gt;image, 130, 88, 250);
$colors[] = imagecolorallocate($chart-&gt;image, 52, 237, 19);
$colors[] = imagecolorallocate($chart-&gt;image, 255, 255, 2);
$colors[] = imagecolorallocate($chart-&gt;image, 254, 0, 0);
$colors[] = imagecolorallocate($chart-&gt;image, 1, 255, 255);
$colors[] = imagecolorallocate($chart-&gt;image, 238, 155, 79);

$chart-&gt;SetData($data, $labels, $colors);
if (true) {
 $chart-&gt;Draw();
} else {
 $chart-&gt;Draw(0,0,300,200);
 $chart-&gt;Draw(300,0,300,200);
 $chart-&gt;Draw(0,200,300,200);
 $chart-&gt;Draw(300,200,300,200);
}
$chart-&gt;Output();

?&gt;
</code></pre>
</div>

<div>
Hi Robert, 
 
What can I say. 
 
This is above and beyond 
 
Thank you so much 
 
Chris
</div>

<div>
This is a brilliant example of EE working at its best.
</div>

<div>
<div class="content wysiwyg-content">
Hi, 
 
We have a JS library that we use to generate a Pie Chart that the displays data as radial differential (rather than an angular one). &nbsp;See attached for an example 
 
Could anyone point us at a PHP Chart Library or expression that could generate this in PHP? 
 
Many thanks 
Chris 
<a href="https://filedb.experts-exchange.com/incoming/2016/03_w12/1087120/Radial-Pie-Chart.jpg" target="_blank" class="file-inline" title="Example of a radial pie chart (35 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Radial-Pie-Chart.jpg</a>
</div>
</div>

Radial-Pie-Chart.jpg

Hi,

We have a JS library that we use to generate a Pie Chart that the displays data as radial differential (rather than an angular one).  See attached for an example

Could anyone point us at a PHP Chart Library or expression that could generate this in PHP?

Many thanks
Chris

PHP Radial Pie Chart

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.