public static function findOverlappingOfTwoLines($line1, $line2, &$overlap1, &$overlap2)
{
$isLine1Reversed = FALSE;
// Check same line or not
if (!Lines::isTwoPiecesOnSameLine($line1, $line2)) {
return FALSE;
}
// Check same directions or not
if (!Lines::areTwoVectorHaveSameDirection($line1, $line2)) {
$line1->reverse();
$isLine1Reversed = TRUE;
}
// Points
$point1 = $line1->point1;
$point2 = $line1->point2;
// Line 1
$point3 = $line2->point1;
$point4 = $line2->point2;
// Line 2
// Calculate line coordinates from point1
$x1 = 0;
$x2 = Points::twoPointsDistance($point1, $point2);
$x3 = Points::twoPointsDistance($point1, $point3);
$x4 = Points::twoPointsDistance($point1, $point4);
// Set sign to coordinates
if (!Lines::areTwoVectorHaveSameDirection($line1, new \Classes\Utils\AbstractInstance\Line($point1, $point3))) {
$x3 *= -1;
}
// Set sign to coordinates
if (!Lines::areTwoVectorHaveSameDirection($line1, new \Classes\Utils\AbstractInstance\Line($point1, $point4))) {
$x4 *= -1;
}
// Overlapping length
$length = min($x2, $x4) - max($x1, $x3);
// Check if therу is overlapping
if ($length <= 0) {
return FALSE;
}
// Create coordinate array
$arrayToSort = array(0 => array('point' => 1, 'value' => $x1), 1 => array('point' => 2, 'value' => $x2), 2 => array('point' => 3, 'value' => $x3), 3 => array('point' => 4, 'value' => $x4));
$sortedArray = Constant::sortArrayByIndex($arrayToSort, 'value');
// Check variant of overlapping
// 1-3-2-4
if ($sortedArray[0]['point'] == 1 && $sortedArray[1]['point'] == 3 && $sortedArray[2]['point'] == 2 && $sortedArray[3]['point'] == 4) {
$overlap1 = array($x3, $x2);
$overlap2 = array(0, $x2 - $x3);
}
// 3-1-4-2
if ($sortedArray[0]['point'] == 3 && $sortedArray[1]['point'] == 1 && $sortedArray[2]['point'] == 4 && $sortedArray[3]['point'] == 2) {
$overlap1 = array(0, $x4);
$overlap2 = array($x1 - $x3, $x4 - $x3);
}
// 1-3-4-2
if ($sortedArray[0]['point'] == 1 && $sortedArray[1]['point'] == 3 && $sortedArray[2]['point'] == 4 && $sortedArray[3]['point'] == 2) {
$overlap1 = array($x3, $x4);
$overlap2 = array(0, $x4 - $x3);
}
// 3-1-2-4
if ($sortedArray[0]['point'] == 3 && $sortedArray[1]['point'] == 1 && $sortedArray[2]['point'] == 2 && $sortedArray[3]['point'] == 4) {
$overlap1 = array(0, $x2);
$overlap2 = array($x1 - $x3, $x2 - $x3);
}
// Reverse overlapping of line1
if ($isLine1Reversed) {
// $x2 = Length(line1)
$begin = $x2 - $overlap1[1];
$end = $x2 - $overlap1[0];
$overlap1[0] = $begin;
$overlap1[1] = $end;
}
return TRUE;
}
