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Fermion.php
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Fermion.php
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<?php
namespace fw;
require_once("Arc.php");
require_once("Line.php");
require_once("Particle.php");
require_once("Point.php");
///
/// Particle represented by a solid stright line conventionally used for
/// fermions
///
class Fermion extends Particle
{
protected function init()
{
return;
}
public function svg()
{
$svg = '<path id="' . $this->id . '" ';
if($this->path->isLine()) $svg .= $this->svg_line();
else $svg .= $this->svg_arc();
if($this->style->get("line-dash-array") != 0)
{
$svg .= '" stroke-dasharray="' . $this->style->get("line-dash-array") . '"';
}
$svg .= ' stroke="' . $this->style->get("line-color") . '"';
$svg .= ' stroke-width="' . $this->style->get("line-width") . '"';
$svg .= ' fill="none" />';
if($this->arrow != "unset") $svg .= "\n" . $this->arrow->svg();
if($this->label != "unset") $svg .= "\n" . $this->label->svg();
return $svg;
}
/// Returns the SVG 'd' attribute for curved fermions
private function svg_arc()
{
$x_rotation = 0;
if($this->path->isLarge()) $large_arc_flag = 1;
else $large_arc_flag = 0;
if($this->path->isClockwise()) $sweep_flag = 1;
else $sweep_flag = 0;
$svg = 'd=" M ' . $this->path->start()->x() . ' ' . $this->path->start()->y();
$svg .= ' A ' . $this->path->radius() . ' ' . $this->path->radius();
$svg .= ' ' . $x_rotation . ' ' . $large_arc_flag . ' ' . $sweep_flag;
$svg .= ' ' . $this->path->end()->x() . ' ' . $this->path->end()->y() . '"';
return $svg;
}
/// Returns the SVG 'd' attribute for straight fermions
private function svg_line()
{
$svg = 'd=" M ' . $this->path->start()->x() . ',' . $this->path->start()->y();
$svg .= ' L ' . $this->path->end()->x() . ',' . $this->path->end()->y() . '"';
return $svg;
}
}
?>

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