public function renderSegment(Vertex $origin, Vertex $end)
{
$ox = round($origin->get_x());
$oy = round($origin->get_y());
$ex = round($end->get_x());
$ey = round($end->get_y());
$size = sqrt(pow($ex - $ox, 2) + pow($ey - $oy, 2));
$dx = round($ox - $ex >= 0 ? $ox - $ex : $ex - $ox);
$dy = round($oy - $ey >= 0 ? $oy - $ey : $ey - $oy);
$sx = round($ox < $ex ? 1 : -1);
$sy = round($oy < $ey ? 1 : -1);
$errx = round($dx > $dy ? $dx : -$dy) / 2;
while ($ox != $ex || $oy != $ey) {
$current_size = sqrt(pow($ex - $ox, 2) + pow($ey - $oy, 2));
$this->renderVertex(new Vertex(['x' => $ox, 'y' => $oy, 'z' => 1, 'color' => $origin->get_color()->sub($end->get_color())->mult(1 - $current_size / $size)]));
$erry = $errx;
if ($erry > -$dx) {
$errx -= $dy;
$ox += $sx;
}
if ($erry < $dy) {
$errx += $dx;
$oy += $sy;
}
}
$this->renderVertex(new Vertex(['x' => $ox, 'y' => $oy, 'z' => 1, 'color' => $end->get_color()]));
return;
}
public function transformVertex(Vertex $v)
{
$x = $this->_matrix['x']['x'] * $v->get_x() + $this->_matrix['x']['y'] * $v->get_y();
$x += $this->_matrix['x']['z'] * $v->get_z() + $this->_matrix['x']['w'] * $v->get_w();
$y = $this->_matrix['y']['x'] * $v->get_x() + $this->_matrix['y']['y'] * $v->get_y();
$y += $this->_matrix['y']['z'] * $v->get_z() + $this->_matrix['y']['w'] * $v->get_w();
$z = $this->_matrix['z']['x'] * $v->get_x() + $this->_matrix['z']['y'] * $v->get_y();
$z += $this->_matrix['z']['z'] * $v->get_z() + $this->_matrix['z']['w'] * $v->get_w();
$w = $this->_matrix['w']['x'] * $v->get_x() + $this->_matrix['w']['y'] * $v->get_y();
$w += $this->_matrix['w']['z'] * $v->get_z() + $this->_matrix['w']['w'] * $v->get_w();
$res = new Vertex(array('x' => $x, 'y' => $y, 'z' => $z, 'w' => $w));
return $res;
}