<?php

//rotate is absolute
//positive is anticlockwise
//rotate starts at horizontal.

$size = 2000;
$fontsize=12;

$pdf = new PDFlib();
$pdf->begin_document("","");

$pdf->set_info("Creator","colourwheel.php");
$pdf->set_info("Author","Telyn Z.");
$pdf->set_info("Title","Colour Wheel");

$pdf->begin_page_ext($size,$size,"");
//$pdf->setcolor("fill","rgb",0,0,0,0); //uncomment this line to get a black background
$pdf->rect(0,0,$size,$size);
$pdf->fill();

$font = $pdf->load_font("Helvetica","iso8859-1","");
$pdf->setfont($font,$fontsize);

define("DEG_TO_RAD",M_PI/180);
//define the origin
$ox = $size/2;
$oy = $ox;
$radius = $ox - $size/10;
$mysql = new MySQLi("mysql","root","password","colourwheel");
$result = $mysql->query("SELECT name,red,green,blue,hue,saturation,value FROM colours");
while($colour = $result->fetch_array()) {
    //Each colour's hsv & rgb are between 0 and 1.
    $angle = -90; //this puts the angle at the top right now.
    $angle -= ($colour['hue']*360); //puts the angle in the right place.
    $width = $pdf->stringwidth($colour['name'],$font,$fontsize);

    $distance = ($width/2) + ($colour['value']*$radius); //offset text length.
    $radians = $angle*DEG_TO_RAD;

    $x = cos($radians)*$distance;
    $y = sin($radians)*$distance;
    $y = $oy-$y;
    $x += $ox;

    $pdf->setcolor("fill","rgb",$colour['red'],$colour['green'],$colour['blue'],0);
    $pdf->fit_textline($colour['name'],$x,$y,"rotate=".-$angle);
}

$pdf->end_page_ext("");

$pdf->end_document("");

$buffer = $pdf->get_buffer();
$length = strlen($buffer);
$pdf->delete();

# header("Content-Type: application/pdf");
# header("Content-Length: $len");
# header("Content-Disposition: inline; filename=colourwheel.pdf");

echo $buffer;

?>