protected function _drawLine(Image_3D_Point $p1, Image_3D_Point $p2)
{
list($x1, $y1) = $p1->getScreenCoordinates();
list($x2, $y2) = $p2->getScreenCoordinates();
$steps = ceil(max(abs($x1 - $x2), abs($y1 - $y2)));
$xdiff = ($x2 - $x1) / $steps;
$ydiff = ($y2 - $y1) / $steps;
$points = array();
for ($i = 0; $i < $steps; ++$i) {
$points[(int) round($x1 + $i * $xdiff)][(int) round($y1 + $i * $ydiff)] = true;
}
return $points;
}
protected function _drawLine(Image_3D_Point $p1, Image_3D_Point $p2)
{
list($x1, $y1) = $p1->getScreenCoordinates();
list($x2, $y2) = $p2->getScreenCoordinates();
$z1 = $p1->getZ();
$z2 = $p2->getZ();
$steps = ceil(max(abs($x1 - $x2), abs($y1 - $y2)));
$xdiff = ($x2 - $x1) / $steps;
$ydiff = ($y2 - $y1) / $steps;
$zdiff = ($z2 - $z1) / $steps;
$points = array('height' => array(), 'coverage' => array());
for ($i = 0; $i < $steps; $i++) {
$x = $x1 + $i * $xdiff;
$xFloor = floor($x);
$xCeil = ceil($x);
$xOffset = $x - $xFloor;
$y = $y1 + $i * $ydiff;
$yFloor = floor($y);
$yCeil = ceil($y);
$yOffset = $y - $yFloor;
if (!isset($points['coverage'][(int) $xFloor][(int) $yCeil])) {
$points['height'][(int) $xFloor][(int) $yCeil] = $z1 + $i * $zdiff;
$points['coverage'][(int) $xFloor][(int) $yCeil] = (1 - $xOffset) * $yOffset;
} else {
$points['coverage'][(int) $xFloor][(int) $yCeil] += (1 - $xOffset) * $yOffset;
}
if (!isset($points['coverage'][(int) $xFloor][(int) $yFloor])) {
$points['height'][(int) $xFloor][(int) $yFloor] = $z1 + $i * $zdiff;
$points['coverage'][(int) $xFloor][(int) $yFloor] = (1 - $xOffset) * (1 - $yOffset);
} else {
$points['coverage'][(int) $xFloor][(int) $yFloor] += (1 - $xOffset) * (1 - $yOffset);
}
if (!isset($points['coverage'][(int) $xCeil][(int) $yCeil])) {
$points['height'][(int) $xCeil][(int) $yCeil] = $z1 + $i * $zdiff;
$points['coverage'][(int) $xCeil][(int) $yCeil] = $xOffset * $yOffset;
} else {
$points['coverage'][(int) $xCeil][(int) $yCeil] += $xOffset * $yOffset;
}
if (!isset($points['coverage'][(int) $xCeil][(int) $yFloor])) {
$points['height'][(int) $xCeil][(int) $yFloor] = $z1 + $i * $zdiff;
$points['coverage'][(int) $xCeil][(int) $yFloor] = $xOffset * (1 - $yOffset);
} else {
$points['coverage'][(int) $xCeil][(int) $yFloor] += $xOffset * (1 - $yOffset);
}
}
return $points;
}
