function processGuitar4svg()
{
global $guitar, $threshold;
//test strings ends are on nut and bridge
//if not dont to partials
$numStrings = sizeof($guitar['strings']);
$doPartials = true;
$parallelFrets = true;
$nut = new Segment($guitar['strings'][0]->end1(), $guitar['strings'][$numStrings - 1]->end1());
$bridge = new Segment($guitar['strings'][0]->end2(), $guitar['strings'][$numStrings - 1]->end2());
$midline = new Segment(new Point(($nut->end2->x + $nut->end1->x) / 2, ($nut->end2->y + $nut->end1->y) / 2), new Point(($bridge->end2->x + $bridge->end1->x) / 2, ($bridge->end2->y + $bridge->end1->y) / 2));
foreach ($guitar['strings'] as $string) {
if (!($nut->distanceToPoint($string->end1()) < $threshold) || !($bridge->distanceToPoint($string->end2()) < $threshold)) {
echo $string->toString(), '<br />';
echo $nut->distanceToPoint($string->end1()), '<br />';
echo $bridge->distanceToPoint($string->end2()), '<br />';
$doPartials = false;
break;
}
}
$denom = ($bridge->end2->y - $bridge->end1->y) * ($nut->end2->x - $nut->end1->x) - ($bridge->end2->x - $bridge->end1->x) * ($nut->end2->y - $nut->end1->y);
if ($denom != 0) {
$parallelFrets = false;
}
$intersection = intersect($nut, $bridge);
$strings = array();
$tones = sizeof($guitar['scale']['steps']) - 1;
$totalWidth = array();
$scale = $guitar['scale']['steps'];
for ($i = 0; $i < $numStrings; $i++) {
$base = $guitar['tuning'][$i];
$frets = array();
$frets[0]['fret'] = $doPartials ? new Segment($guitar['meta'][$i]->end1, $guitar['meta'][$i + 1]->end1) : new Segment($guitar['strings'][$i]->end1, $guitar['strings'][$i]->end1);
$frets[0]['intersection'] = $guitar['strings'][$i]->end1;
for ($j = 1; $j <= $guitar['frets']; $j++) {
$step = ($base + $j - 1) % $tones + 1;
// $step=(($base+$j)%($tones-1))+1;
// $step=$step==0?1:$step;
$ratio = 1 - $scale[$step][1] * $scale[$step - 1][0] / ($scale[$step][0] * $scale[$step - 1][1]);
$x = $frets[$j - 1]['intersection']->x + $ratio * ($guitar['strings'][$i]->end2->x - $frets[$j - 1]['intersection']->x);
$y = $frets[$j - 1]['intersection']->y + $ratio * ($guitar['strings'][$i]->end2->y - $frets[$j - 1]['intersection']->y);
$frets[$j]['intersection'] = new Point($x, $y);
$temp = new Segment($guitar['strings'][$i]->end1(), $frets[$j]['intersection']);
$frets[$j]['nutDist'] = $temp->length();
$frets[$j]['totalRatio'] = $frets[$j]['nutDist'] / $guitar['strings'][$i]->length();
if ($doPartials) {
/* //partials depending on nut bridge intersection (bad)
$temp=$parallelFrets?
$nut->createParallel($frets[$j]['intersection']):
new Segment($intersection,$frets[$j]['intersection']);
$frets[$j]['fret']=new Segment(intersect($temp,$guitar['meta'][$i]),
intersect($temp,$guitar['meta'][$i+1]));
//partials depending on meta lines (questionable)
if ($parallelFrets)
{
$frets[$j]['fret']=$nut->createParallel($frets[$j]['intersection']);
}
else
{
$frets[$j]['fret']=new Segment(
$guitar['meta'][$i]->pointAt($guitar['meta'][$i]->length()*
$frets[$j]['totalRatio']),
$guitar['meta'][$i+1]->pointAt($guitar['meta'][$i+1]->length()*
$frets[$j]['totalRatio'])
);
}
*/
//partials depending on outer strings (questionable)
if ($parallelFrets) {
$temp = $nut->createParallel($frets[$j]['intersection']);
} else {
$temp = new Segment($guitar['strings'][0]->pointAt($guitar['strings'][0]->length() * $frets[$j]['totalRatio']), $guitar['strings'][$numStrings - 1]->pointAt($guitar['strings'][$numStrings - 1]->length() * $frets[$j]['totalRatio']));
}
$frets[$j]['fret'] = new Segment(intersect($temp, $guitar['meta'][$i]), intersect($temp, $guitar['meta'][$i + 1]));
} else {
$frets[$j]['fret'] = new Segment($frets[$j]['intersection'], $frets[$j]['intersection']);
}
}
$strings[] = $frets;
}
return array('strings' => $strings, 'midline' => $midline, 'nut' => $nut, 'bridge' => $bridge);
}