public override void Run(List <Point> points, List <Line> lines, List <Polygon> polygons, ref List <Point> outPoints, ref List <Line> outLines, ref List <Polygon> outPolygons)
{
B = new Point(((points[0].X + points[1].X + points[2].X) / 3), ((points[0].Y + points[1].Y + points[2].Y) / 3));
Point NB = new Point(B.X + 5, B.Y);
Base_Line = new Line(B, NB);
/*
* // step 1 :: find minimum point in Y Axis
* minimumY = points[0]; ; // any intial value
* for (int i = 0; i < points.Count(); i++)
* {
* if (points[i].Y < minimumY.Y)
* {
* minimumY = points[i];
* index_of_mini_Y = i;
* }
*
* else if (points[i].Y == minimumY.Y)
* {
* if (points[i].X < minimumY.X)
* {
* minimumY = points[i];
* index_of_mini_Y = i;
* }
* }
* }
*
* // Get Base_line
* Base_Line.Start = minimumY;
* Point End = new Point(minimumY.X + 5, minimumY.Y);
* Base_Line.End = End;
*
*
*/
// Comparison<Point> comp = new Comparison<Point>(compare_angle);
OrderedSet <Point> CH = new OrderedSet <Point>(compare_angle);
// CH.add(Points[0], Points[1], Points[2]);
CH.Add(points[0]);
CH.Add(points[1]);
CH.Add(points[2]);
Point p = points[0]; // any intial value
Point p_Prev, p_next;
Line l1 = new Line(points[0], points[1]); // any intial value
for (int i = 3; i < points.Count(); i++)
{
p = points[i];
//KeyValuePair<Point, Point> prevANDnext = CH.DirectRightAndLeftRotational(p);
p_Prev = CH.DirectRightAndLeftRotational(p).Value;
p_next = CH.DirectRightAndLeftRotational(p).Key;
l1.Start = p_Prev;
l1.End = p_next;
if (HelperMethods.CheckTurn(l1, p) == Enums.TurnType.Right) // Outside the polygon
{
//KeyValuePair<Point, Point> prevANDnext_2 = CH.DirectRightAndLeftRotational(p_Prev);
Point New_pre = CH.DirectRightAndLeftRotational(p_Prev).Value;
l1.Start = p;
l1.End = p_Prev;
while (HelperMethods.CheckTurn(l1, New_pre) == Enums.TurnType.Left)
{
CH.Remove(p_Prev);
//left support part
p_Prev = New_pre;
New_pre = CH.DirectRightAndLeftRotational(p_Prev).Value;
l1.Start = p;
l1.End = p_Prev;
} // end of while Left Supporting Line
Point New_next = CH.DirectRightAndLeftRotational(p_next).Key;
l1.Start = p;
l1.End = p_next;
while (HelperMethods.CheckTurn(l1, New_next) == Enums.TurnType.Right)
{
CH.Remove(p_next);
p_next = New_next;
New_next = CH.DirectRightAndLeftRotational(p_next).Key;
l1.Start = p;
l1.End = p_next;
} // // end of while Right Supporting Line
// leave Pre and Next but delete the points between them
CH.Add(p);
} // end of ( if condtion :: --->> point outside the triangle
} // end of for loop
outPoints = CH.ToList();
}
public void HandleEvent(Event current_Event)
{
if (current_Event.status == 0) //StartEvent
{
/*
* 1- Insert currentEvent in L.
* L.Add( new Event(null, type= StartPoint, currentSegment.segmentIndex)
*
* 2. CheckIntersection( L.prev(currentSegment), currentSegment).
*
* 3. CheckIntersection( currentSegment, L.next(currentSegment)).
*/
int index_of_current_Event_AS_line = current_Event.L1_index;
//1- Insert currentEvent in L. L.Add( new Event(null, type= StartPoint, currentSegment.segmentIndex)
L_SweepLine_Ordered_SET.Add(new Event(current_Event.Current_Point, 0, index_of_current_Event_AS_line, 0));
// 2. CheckIntersection( L.prev(currentSegment), currentSegment).
// int index_of_current_Event_AS_line = current_Event.L1_index;
Line current_Event_AS_line = copy_OF_input_lines[index_of_current_Event_AS_line];
int index_Prev_of_currentEvent = L_SweepLine_Ordered_SET.DirectRightAndLeftRotational(current_Event).Value.L1_index;
Line Prev_of_currentEvent = copy_OF_input_lines[index_Prev_of_currentEvent];
bool check_intersection_between_currEvnet_AND_prev = HelperMethods.doIntersect_between_2_Segments(Prev_of_currentEvent, current_Event_AS_line);
if (check_intersection_between_currEvnet_AND_prev == true)
{
// if ther is intersection between currEvnet AND previous then calculate the cordinates of point of intersection
// AND add this point to the output points (( intersection_points_list )) so that they appear on the UI and the test cases.
// AND also add it to Q_Ordered_SET_EventPoints as these points will be future Events that need to be handled
bool infinty_intersection_point = true;
Point intersection_point = HelperMethods.Get_intersection_point_cordinates(Prev_of_currentEvent, current_Event_AS_line, ref infinty_intersection_point);
if (infinty_intersection_point == false) //mean that the get_intersection function return an infinity
{
intersection_points_list.Add(intersection_point);
Event intersection_Event = new Event(intersection_point, 2, index_of_current_Event_AS_line, index_Prev_of_currentEvent);
Q_Ordered_SET_EventPoints.Add(intersection_Event);
}
}
// * 3. CheckIntersection( currentSegment, L.next(currentSegment)).
int index_Next_of_currentEvent = L_SweepLine_Ordered_SET.DirectRightAndLeftRotational(current_Event).Key.L1_index;
Line Next_of_currentEvent = copy_OF_input_lines[index_Next_of_currentEvent];
bool check_intersection_between_currEvnet_AND_Next = HelperMethods.doIntersect_between_2_Segments(Next_of_currentEvent, current_Event_AS_line);
if (check_intersection_between_currEvnet_AND_Next == true)
{
// if ther is intersection between currEvnet AND Next then calculate the cordinates of point of intersection
// AND add this point to the output points (( intersection_points_list )) so that they appear on the UI and the test cases.
// AND also add it to Q_Ordered_SET_EventPoints as these points will be future Events that need to be handled
bool infinty_intersection_point = true;
Point intersection_point = HelperMethods.Get_intersection_point_cordinates(Next_of_currentEvent, current_Event_AS_line, ref infinty_intersection_point);
if (infinty_intersection_point == false) //mean that the get_intersection function return an infinity
{
intersection_points_list.Add(intersection_point);
Event intersection_Event = new Event(intersection_point, 2, index_of_current_Event_AS_line, index_Next_of_currentEvent);
Q_Ordered_SET_EventPoints.Add(intersection_Event);
}
}
} // end of StartEvent
else if (current_Event.status == 1)
{
/*EndEvent:
* 1 . CheckIntersection( L.prev(currentSegment), L.next(currentSegment) ).
* 2. Delete currentEvent from L.
* // 1) Add the intersection points (if exists) in the output points so that they appear on the
* UI and the test cases.
* // 2) Now L has passed over this segment and we are sure there is no more intersections
* with this segment, so remove the current segment from L*/
// 1 . CheckIntersection( L.prev(currentSegment), L.next(currentSegment) ).
// 1) Add the intersection points (if exists) in the output points so that they appear on the UI and the test cases.
int index_Prev_of_currentEvent = L_SweepLine_Ordered_SET.DirectRightAndLeftRotational(current_Event).Value.L1_index;
Line Prev_of_currentEvent = copy_OF_input_lines[index_Prev_of_currentEvent];
int index_Next_of_currentEvent = L_SweepLine_Ordered_SET.DirectRightAndLeftRotational(current_Event).Key.L1_index;
Line Next_of_currentEvent = copy_OF_input_lines[index_Next_of_currentEvent];
bool check_intersection_between_Next_AND_prev = HelperMethods.doIntersect_between_2_Segments(Prev_of_currentEvent, Next_of_currentEvent);
if (check_intersection_between_Next_AND_prev == true)
{
// if ther is intersection between currEvnet Next AND previous then calculate the cordinates of point of intersection
// AND add this point to the output points (( intersection_points_list )) so that they appear on the UI and the test cases.
// and also add it to Q_Ordered_SET_EventPoints
bool infinty_intersection_point = true;
Point intersection_point = HelperMethods.Get_intersection_point_cordinates(Prev_of_currentEvent, Next_of_currentEvent, ref infinty_intersection_point);
if (infinty_intersection_point == false) //mean that the get_intersection function return an infinity
{
intersection_points_list.Add(intersection_point);
Event intersection_Event = new Event(intersection_point, 2, index_Prev_of_currentEvent, index_Next_of_currentEvent);
Q_Ordered_SET_EventPoints.Add(intersection_Event);
}
}
// 2. Delete currentEvent from L.
// 2) Now L has passed over this segment and we are sure there is no more intersections with this segment, so remove the current segment from L
L_SweepLine_Ordered_SET.Remove(current_Event);
}//end of EndEvent
else if (current_Event.status == 2)
{
/*1 . Find s1 & s2 are the segment intersecting together (s1 below s2).
* 2. CheckIntersection( L.prev(s1), s2 )).
* 3. CheckIntersection( L.next(s2), s1))
* 4. Swap s1 and s2 in L.
* // 1) Store another index in the class of Event that refer to the other segment
* intersecting with the point.
* // 2) To swap 2 events, e1 and e2, remove them from the sweepLine and assign the
* start of each segment of them to the intersection point and reinsert them in the
* sweepLine. The comparison passed to the sweepLine function will find them having
* the same x and the same y in their start point, and will check their ends and return the
* end with the higher Y (and lower X in case of a tie))
* //3) Add the intersection points (if exists) in the output points so that they appear on
* the UI and the test cases.
*/
//1 . Find s1 & s2 are the segment intersecting together (s1 below s2).
// 1) Store another index in the class of Event that refer to the other segment intersecting with the point.
Line S1 = copy_OF_input_lines[current_Event.L1_index];
Line S2 = copy_OF_input_lines[current_Event.L2_index];
// 2. CheckIntersection( L.prev(s1), s2 )).
Event New_S1 = new Event(current_Event.Current_Point, 0, current_Event.L1_index, 0);
Event Prev_S1 = L_SweepLine_Ordered_SET.DirectRightAndLeftRotational(New_S1).Value;
Line Prev_S1_AS_line = copy_OF_input_lines[Prev_S1.L1_index];
bool intersection_between_PrevS1_AND_S2 = HelperMethods.doIntersect_between_2_Segments(Prev_S1_AS_line, S2);
if (intersection_between_PrevS1_AND_S2 == true)
{
// add this point to the output points (( intersection_points_list )) so that they appear on the UI and the test cases.
// and also add it to Q_Ordered_SET_EventPoints
bool infinty_intersection_point = true;
Point intersection_point = HelperMethods.Get_intersection_point_cordinates(Prev_S1_AS_line, S2, ref infinty_intersection_point);
if (infinty_intersection_point == false) //mean that the get_intersection function return an infinity
{
if (intersection_point.X > current_Event.Current_Point.X)
{
intersection_points_list.Add(intersection_point);
Event intersection_Event = new Event(intersection_point, 2, Prev_S1.L1_index, current_Event.L2_index);
Q_Ordered_SET_EventPoints.Add(intersection_Event);
}
}
}
// 3. CheckIntersection( L.next(s2), s1))
Event New_s2 = new Event(current_Event.Current_Point, 0, current_Event.L2_index, 0);
Event Next_S2 = L_SweepLine_Ordered_SET.DirectRightAndLeftRotational(New_s2).Key;
Line Next_s2_as_line = copy_OF_input_lines[Next_S2.L1_index];
bool intersection_between_NextS2_AND_S1 = HelperMethods.doIntersect_between_2_Segments(Next_s2_as_line, S1);
if (intersection_between_NextS2_AND_S1 == true)
{
// add this point to the output points (( intersection_points_list )) so that they appear on the UI and the test cases.
// and also add it to Q_Ordered_SET_EventPoints
bool infinty_intersection_point = true;
Point intersection_point = HelperMethods.Get_intersection_point_cordinates(Next_s2_as_line, S1, ref infinty_intersection_point);
if (infinty_intersection_point == false) //mean that the get_intersection function return an infinity
{
if (intersection_point.X > current_Event.Current_Point.X)
{
intersection_points_list.Add(intersection_point);
Event intersection_Event = new Event(intersection_point, 2, Next_S2.L1_index, current_Event.L1_index);
Q_Ordered_SET_EventPoints.Add(intersection_Event);
}
}
}
//4. Swap s1 and s2 in L.
/* To swap 2 events, e1 and e2, remove them from the sweepLine and assign the
* start of each segment of them to the intersection point and reinsert them in the
* sweepLine. The comparison passed to the sweepLine function will find them having
* the same x and the same y in their start point, and will check their ends and return the
* end with the higher Y (and lower X in case of a tie))*/
L_SweepLine_Ordered_SET.Remove(New_S1);
L_SweepLine_Ordered_SET.Remove(New_s2);
New_S1.Current_Point = current_Event.Current_Point;
//New_S1.L1_index = New_s2.L1_index;
New_s2.Current_Point = current_Event.Current_Point;
// New_s2.L1_index = New_S1.L1_index;
L_SweepLine_Ordered_SET.Add(New_S1);
L_SweepLine_Ordered_SET.Add(New_s2);
} //end of intersectionEvent
} // end of HandleEvent Function
