// key difference between a static and a non-static method is that static method belongs to a class while non-static method belongs to the instance
public static double angle_between(edge_store with_edge, edge_store the_edge)
{
double v1_x, v1_y;
double v2_x, v2_y;
double normalzie;
// vector with edge
v1_x = with_edge.end_pt.x - with_edge.start_pt.x;
v1_y = with_edge.end_pt.y - with_edge.start_pt.y;
normalzie = Math.Sqrt(Math.Pow(v1_x, 2) + Math.Pow(v1_y, 2));
v1_x = v1_x / normalzie;
v1_y = v1_y / normalzie;
// vector the edge
v2_x = the_edge.end_pt.x - the_edge.start_pt.x;
v2_y = the_edge.end_pt.y - the_edge.start_pt.y;
normalzie = Math.Sqrt(Math.Pow(v2_x, 2) + Math.Pow(v2_y, 2));
v2_x = v2_x / normalzie;
v2_y = v2_y / normalzie;
// sin and cos of the two vectors
double sin = (v1_x * v2_y) - (v2_x * v1_y);
double cos = (v1_x * v2_x) + (v1_y * v2_y);
double angle = (Math.Atan2(sin, cos) / Math.PI) * 180f;
if (angle <= 0) // there is no zero degree (zero degree = 360 degree) to avoid the vertical line mismatch
{
angle += 360f;
}
return(angle);
}
public edge_store find_intial_baseLR(List <point_store> left, List <point_store> right)
{
point_store left_end = left[left.Count - 1]; // left end // Colinear error fixed
point_store right_end = right[0]; // right end
edge_store left_bot_edge = left_end.cw_vertical_edge(0); // First Vertical edge at clock wise direction at this point
edge_store right_bot_edge = right_end.cc_vertical_edge(0); // First Vertical edge at counter clock wise direction at this point
while (true)
{
// Select the bottom most end by comparing the orientation with the other
if (leftof(right_end, left_bot_edge) == true) // check the right_end point and orientation of the left edge
{
left_end = left_bot_edge.the_other_pt(left_end); // Find the next point (whihc is the endpoint of the left edge)
left_bot_edge = left_end.cw_vertical_edge(0);
}
else if (rightof(left_end, right_bot_edge) == true) // check the left_end point and orientation of the right edge
{
right_end = right_bot_edge.the_other_pt(right_end); // Find the next point (which is the endpoint of the right edge)
right_bot_edge = right_end.cc_vertical_edge(0);
}
else
{
break;
}
}
add_edge(left_end, right_end); // Add the base LR edge
return(edge_list[edge_list.Count - 1]); // return the last add item (which is the baseLR edge)
}
private void add_to_local_list(edge_store e, triangle_store t)
{
//____________________________________________________________________________________________________________________________________________________________________
// !! Addition on main list here
//Form1.planar_object_store.point2d spt = local_input_points.Find(obj => obj.Equals(new Form1.planar_object_store.point2d(e.start_pt.pt_id, e.start_pt.x, e.start_pt.y)));
//Form1.planar_object_store.point2d ept = local_input_points.Find(obj => obj.Equals(new Form1.planar_object_store.point2d(-1, e.end_pt.x, e.end_pt.y)));
Form1.planar_object_store.edge2d temp_edge = new Form1.planar_object_store.edge2d(e.edge_id, e.start_pt.get_parent_data_type, e.end_pt.get_parent_data_type);
local_output_edges.Add(temp_edge);
if (t != null)
{
Form1.planar_object_store.face2d temp_face = new Form1.planar_object_store.face2d(t.tri_id, t.p1.get_parent_data_type, t.p2.get_parent_data_type, t.p3.get_parent_data_type);
local_output_triangle.Add(temp_face);
}
// #################################################################
Form1.planar_object_store.instance_tracker temp_edge_tracker = new Form1.planar_object_store.instance_tracker();
temp_edge_tracker.edge_list = new List <Form1.planar_object_store.edge2d>();
temp_edge_tracker.edge_list.AddRange(local_output_edges);
temp_edge_tracker.face_list = new List <Form1.planar_object_store.face2d>();
temp_edge_tracker.face_list.AddRange(local_output_triangle);
local_history_tracker.Add(temp_edge_tracker);
// #################################################################
}
public bool Equals_without_orientation(edge_store other)
{
if ((other.Equals(this) == true) || (other.Equals(this.sym) == true))
{
return(true);
}
return(false);
}
public bool Equals(edge_store other)
{
if (other.start_pt.Equals(this._start_pt) == true && other.end_pt.Equals(this._end_pt) == true)
{
return(true);
}
return(false);
}
private void add_to_local_edge_list(edge_store e)
{
//____________________________________________________________________________________________________________________________________________________________________
// !! Addition on main list here
Form1.planar_object_store.edge2d temp_edge = new Form1.planar_object_store.edge2d(e.edge_id, e.start_pt.get_parent_data_type, e.end_pt.get_parent_data_type);
local_output_edges.Add(temp_edge);
}
public void delete_edge(edge_store edge_to_delete)
{
int edge_index = this._connected_edge_list.FindIndex(obj => obj.Equals(edge_to_delete));
if (edge_index != -1)
{
this._connected_edge_list.RemoveAt(edge_index);
}
}
private void remove_from_local_edge_list(edge_store e)
{
//____________________________________________________________________________________________________________________________________________________________________
// !! Addition on main list here
Form1.planar_object_store.edge2d temp_edge = new Form1.planar_object_store.edge2d(e.edge_id, e.start_pt.get_parent_data_type, e.end_pt.get_parent_data_type);
int temp_id = local_output_edges.FindLastIndex(obj => obj.edge_id == e.edge_id);
local_output_edges.RemoveAt(temp_id);
//local_output_edges.Remove(temp_edge);
}
public void delaunay_divide_n_conquer(List <point_store> left_list, List <point_store> right_list)
{
// main divide and conquer recursive function
// Left
if (left_list.Count > 3)
{
int half_length = Convert.ToInt32(Math.Ceiling(left_list.Count / 2.0f));
List <point_store> left_left_list = left_list.GetRange(0, half_length); // extract the left list
List <point_store> left_right_list = left_list.GetRange(half_length, left_list.Count - half_length); // extract the right list
// delaunay divide and conquer
delaunay_divide_n_conquer(left_left_list, left_right_list);
}
else
{
if (left_list.Count == 3)
{
add_triangle(left_list[0], left_list[1], left_list[2]);
}
else // pts.count == 2
{
{
add_edge(left_list[0], left_list[1]);
}
}
}
// Right
if (right_list.Count > 3)
{
int half_length = Convert.ToInt32(Math.Ceiling(right_list.Count / 2.0f));
List <point_store> right_left_list = right_list.GetRange(0, half_length); // extract the left list
List <point_store> right_right_list = right_list.GetRange(half_length, right_list.Count - half_length); // extract the right list
// delaunay divide and conquer
delaunay_divide_n_conquer(right_left_list, right_right_list);
}
else
{
if (right_list.Count == 3)
{
add_triangle(right_list[0], right_list[1], right_list[2]);
}
else // pts.count == 2
{
{
add_edge(right_list[0], right_list[1]);
}
}
}
edge_store baseLR = find_intial_baseLR(left_list, right_list);
//Link LR edges
Merge_LRedges(baseLR);
}
public bool contains_edge(edge_store the_edge)
{
// find whether the edge belongs to the triangle
if (the_edge.Equals_without_orientation(this._e1) == true ||
the_edge.Equals_without_orientation(this._e2) == true ||
the_edge.Equals_without_orientation(this._e3) == true)
{
return(true);
}
return(false);
}
public bool equal_edge(edge_store other_e)
{
if (other_e.Equals(this.e1) == true || other_e.Equals(this.e2) == true || other_e.Equals(this.e3) == true)
{
return(true);
}
else
{
return(false);
}
}
private edge_store get_edge_away_from_this_pt(edge_store the_edge)
{
// This function returns the edge oriented from this point
point_store this_pt = new point_store(this._pt_id, this._x, this._y, this.store_parent_data);
if (the_edge.start_pt.Equals(this_pt) == false)
{
return(new edge_store(the_edge.edge_id, this_pt, the_edge.the_other_pt(this_pt)));
}
else
{
return(the_edge);
}
}
private void add_edge(point_store p1, point_store p2)
{
int edge_id = get_unique_edge_id();
edge_store e = new edge_store(edge_id, p1, p2);
// Update the points p1 & p2 -> edge id lists
// Note points are never removed from the list so indexing is easier (pt_id remains the same)
pt_list[p1.pt_id].add_sorted_edge(e);
pt_list[p2.pt_id].add_sorted_edge(e);
edge_list.Add(e); // Add the edge e to the list
add_to_local_list(e, null);
}
private void delete_from_local_list(edge_store e, int t1_id, int t2_id)
{
Form1.planar_object_store.edge2d temp_edge, temp_edge_sym;
int rem_index;
// edge e
// !! removal on main list here
temp_edge = new Form1.planar_object_store.edge2d(e.edge_id, e.start_pt.get_parent_data_type, e.end_pt.get_parent_data_type);
temp_edge_sym = new Form1.planar_object_store.edge2d(e.edge_id, e.end_pt.get_parent_data_type, e.start_pt.get_parent_data_type);
rem_index = local_output_edges.FindIndex(obj => obj.Equals(temp_edge) || obj.Equals(temp_edge_sym));
if (rem_index != -1)
{
local_output_edges.RemoveAt(rem_index); // !! Deletion on main list here
if (t1_id != -1 || t2_id != -1) // Check whether triangle need to be removed
{
if (t1_id < t2_id) // swap to remove in order
{
int temp = t1_id;
t1_id = t2_id;
t2_id = temp;
}
if (t1_id != -1)
{
int t1_index = local_output_triangle.FindIndex(obj => obj.face_id == triangle_list[t1_id].tri_id);
local_output_triangle.RemoveAt(t1_index);
}
if (t2_id != -1)
{
int t2_index = local_output_triangle.FindIndex(obj => obj.face_id == triangle_list[t2_id].tri_id);
local_output_triangle.RemoveAt(t2_index);
}
}
// #################################################################
Form1.planar_object_store.instance_tracker temp_edge_tracker = new Form1.planar_object_store.instance_tracker();
temp_edge_tracker.edge_list = new List <Form1.planar_object_store.edge2d>();
temp_edge_tracker.edge_list.AddRange(local_output_edges);
temp_edge_tracker.face_list = new List <Form1.planar_object_store.face2d>();
temp_edge_tracker.face_list.AddRange(local_output_triangle);
local_history_tracker.Add(temp_edge_tracker);
// #################################################################
}
}
public edge_store cw_vertical_edge(edge_store with_edge) // clockwise vertical edge
{
int index_of_next = this._connected_edge_list.FindIndex(obj => obj.edge_id == with_edge.edge_id);
if (index_of_next == -1) // object not found
{
return(null); // this should never happen
}
index_of_next--; // next clockwise edge in the list
if (index_of_next == -1) // check if the index reached begining
{
index_of_next = this._connected_edge_list.Count - 1; //cycle back to end (reverse)
}
return(cc_vertical_edge(index_of_next)); //0,1,2,.....
}
public edge_store cc_vertical_edge(edge_store with_edge) //counter clockwise vertical edge
{
int index_of_next = this._connected_edge_list.FindIndex(obj => obj.edge_id == with_edge.edge_id);
if (index_of_next == -1) // object not found
{
return(null); // this should never happen
}
index_of_next++; // next counter clockwise edge in the list
if (index_of_next == this._connected_edge_list.Count) // check if the index reached end
{
index_of_next = 0; //cycle back to zero
}
return(cc_vertical_edge(index_of_next)); //0,1,2,.....
}
public triangle_store(int i_tri_id, point_store i_p1, point_store i_p2, point_store i_p3, edge_store i_e1, edge_store i_e2, edge_store i_e3)
{
// Constructor
// set id
this._tri_id = i_tri_id;
// set points
this._pt1 = i_p1;
this._pt2 = i_p2;
this._pt3 = i_p3;
// set edges
this._e1 = i_e1;
this._e2 = i_e2;
this._e3 = i_e3;
// set the mid point
this._mid_pt = new point_store(-1, (this._pt1.x + this._pt2.x + this._pt3.x) / 3.0f, (this._pt1.y + this._pt2.y + this._pt3.y) / 3.0f, null);
}
public point_store get_other_pt(edge_store the_edge)
{
// Returns the third vertex of this triangle which is not part of the given edge
if (the_edge.Equals_without_orientation(this.e1) == true)
{
return(this.e2.find_common_pt(this.e3));
}
else if (the_edge.Equals_without_orientation(this.e2) == true)
{
return(this.e3.find_common_pt(this.e1));
}
else if (the_edge.Equals_without_orientation(this.e3) == true)
{
return(this.e1.find_common_pt(this.e2));
}
return(null);
}
public void add_sorted_edge(edge_store edge_to_add)
{
// Add the edges as counter clock wise to the sorted list
// this_pt
// |\
// | \
// | \
// | \
// | \
// | \
// V V
// vertical edge_0
//____________________________________________________________________________________
edge_to_add = get_edge_away_from_this_pt(edge_to_add); // Always add edge away from this point
if (this._connected_edge_list.Count == 0)
{
this._connected_edge_list.Add(edge_to_add);
return;
}
if (new edge_angle_comparer_vertical().Compare(this._connected_edge_list[this._connected_edge_list.Count - 1], edge_to_add) <= 0) // Equal to zero should not occur
{
this._connected_edge_list.Add(edge_to_add);
return;
}
if (new edge_angle_comparer_vertical().Compare(this._connected_edge_list[0], edge_to_add) >= 0) // Equal to zero should not occur
{
this._connected_edge_list.Insert(0, edge_to_add); // Insert at zero because all the other angles are higher
return;
}
// Uses a binary search algorithm to locate a specific element in the sorted List<edge_store>
int index = this._connected_edge_list.BinarySearch(edge_to_add, new edge_angle_comparer_vertical());
if (index < 0)
{
index = ~index; // Bitwise Complement operator is represented by ~.It is a unary operator, i.e.operates on only one operand.The ~ operator inverts each bits i.e.changes 1 to 0 and 0 to 1.
}
this._connected_edge_list.Insert(index, edge_to_add);
}
public point_store find_common_pt(edge_store other_edge)
{
// Returns the common point of this edge and the other edges
if (this.start_pt.Equals(other_edge.start_pt))
{
return(this.start_pt);
}
else if (this.start_pt.Equals(other_edge.end_pt))
{
return(this.start_pt);
}
else if (this.end_pt.Equals(other_edge.start_pt))
{
return(this.end_pt);
}
else if (this.end_pt.Equals(other_edge.end_pt))
{
return(this.end_pt);
}
return(null);
}
public bool commutative_equal(edge_store other) // commutative equals check edges with same two points but different orientation
{
return((this._start_pt.Equals(other.start_pt) && this._end_pt.Equals(other.end_pt)) ||
(this._end_pt.Equals(other.start_pt) && this._start_pt.Equals(other.end_pt)));
}
public bool Equals(edge_store other) // orientation is important
{
return(this._start_pt.Equals(other.start_pt) && this._end_pt.Equals(other.end_pt));
}
private bool rightof(point_store x, edge_store e)
{
return(ccw(x, e.end_pt, e.start_pt));
}
public void Merge_LRedges(edge_store baseLRedge)
{
edge_store baseLRedge_sym = new edge_store(baseLRedge.edge_id, baseLRedge.end_pt, baseLRedge.start_pt); // symmetry of baseLRedge
edge_store lcand = baseLRedge.start_pt.cc_vertical_edge(baseLRedge); // left candidate
edge_store rcand = baseLRedge.end_pt.cw_vertical_edge(baseLRedge_sym); // rigth candidate
// Left side Remove operation
if (leftof(lcand.end_pt, baseLRedge) == true) // if the left candidate end point is not leftof baseLRedge then top is reached with baseLRedge and the end point of leftcandidate will not lie inCircle
{
edge_store lcand_next = baseLRedge.start_pt.cc_vertical_edge(lcand); // find the next candidate by counter clockwise cycle at baseLRedge start point with the current left candidate as qualifier
while (incircle(baseLRedge.start_pt, baseLRedge.end_pt, lcand.end_pt, lcand_next.end_pt) == true)
{
edge_store new_lcand = baseLRedge.start_pt.cc_vertical_edge(lcand); // find the next candidate by counter clockwise cycle at baseLRedge start point with the current left candidate as qualifier
remove_edge(lcand.edge_id);
lcand = new_lcand;
lcand_next = baseLRedge.start_pt.cc_vertical_edge(lcand);
}
}
// Right side Remove operation
if (rightof(rcand.end_pt, baseLRedge_sym) == true) // if the right candidate end point is not rightof baseLRedge_sym then top is reached with baseLRedge and the end point of rightcandidate will not lie inCircle
{
edge_store rcand_next = baseLRedge.end_pt.cw_vertical_edge(rcand); // find the next candidate by clockwise cycle at baseLRedge end point with the current right candidate as qualifier
while (incircle(baseLRedge_sym.end_pt, baseLRedge_sym.start_pt, rcand.end_pt, rcand_next.end_pt) == true)
{
edge_store new_rcand = baseLRedge.end_pt.cw_vertical_edge(rcand); // find the next candidate by clockwise cycle at baseLRedge end point with the current right candidate as qualifier
remove_edge(rcand.edge_id);
rcand = new_rcand;
rcand_next = baseLRedge.end_pt.cw_vertical_edge(rcand);
}
}
bool lvalid, rvalid;
lvalid = leftof(lcand.end_pt, baseLRedge); // validity of left candidate
rvalid = rightof(rcand.end_pt, baseLRedge_sym); // validity of right candidate
// The next cross edge is to be connected to either lcand.end_pt or rcand.end_pt
if (lvalid == true && rvalid == true) // both are valid, then choose the correct end with in-circle test
{
if (incircle(baseLRedge.start_pt, baseLRedge.end_pt, lcand.end_pt, rcand.end_pt) == true) //right candidate end point lies inside in circle formed by left candidate
{
add_edge_with_triangle(baseLRedge.start_pt, rcand.end_pt); // so form the edge with right candidate end point
}
else // left candidate end point in cicle doesn't enclose right candidate end point
{
add_edge_with_triangle(lcand.end_pt, baseLRedge_sym.start_pt); // so form the edge with left candidate end point
}
}
else if (lvalid == true)
{
add_edge_with_triangle(lcand.end_pt, baseLRedge_sym.start_pt);// Add cross edge base1 from lcand.end_pt to baseLRedge_sym.start_pt
}
else if (rvalid == true)
{
add_edge_with_triangle(baseLRedge.start_pt, rcand.end_pt);// Add cross edge basel frombaseLRedge.start_pt to rcand.end_pt
}
else
{
// both lcand and rcand are making obtuse angle with baseLRedge, then baseLRedge is the upper common tangent
return; // end of recursion
}
edge_store new_baseLRedge = edge_list[edge_list.Count - 1]; // new baseLRedge is the last created edge
Merge_LRedges(new_baseLRedge); // Recursion here
}
private static bool leftof(point_store x, edge_store e)
{
return(ccw(x, e.start_pt, e.end_pt));
}
private void add_edge_with_triangle(point_store p1, point_store p2)
{
int edge_id = get_unique_edge_id();
edge_store e = new edge_store(edge_id, p1, p2);
// Update the points p1 & p2 -> edge id lists
// Note points are never removed from the list so indexing is easier (pt_id remains the same)
pt_list[p1.pt_id].add_sorted_edge(e);
pt_list[p2.pt_id].add_sorted_edge(e);
// Now find the other two edges connected to this edge forming a triangle
bool is_triangle_found = false;
edge_store second_edge, third_edge;
// clockwise search
second_edge = e.end_pt.cc_vertical_edge(e);
third_edge = second_edge.end_pt.cc_vertical_edge(second_edge);
if (third_edge.end_pt.Equals(e.start_pt) == true)
{
is_triangle_found = true;
}
else
{
// counter clockwise search
second_edge = e.end_pt.cw_vertical_edge(e);
third_edge = second_edge.end_pt.cw_vertical_edge(second_edge);
if (third_edge.end_pt.Equals(e.start_pt) == true)
{
is_triangle_found = true;
}
}
edge_list.Add(e); // Add the edge e to the list
if (is_triangle_found == true) // must found otherwise something went wrong
{
int tri_id = get_unique_triangle_id();
int second_edge_index, third_edge_index;
second_edge_index = edge_list.FindIndex(obj => obj.edge_id == second_edge.edge_id);
third_edge_index = edge_list.FindIndex(obj => obj.edge_id == third_edge.edge_id);
edge_list[second_edge_index].add_triangle_id(tri_id); // got lazy.. need to develop more efficient method
edge_list[third_edge_index].add_triangle_id(tri_id); // got lazy.. need to develop more efficient method
// Update the edge triangle id
edge_list[edge_list.Count - 1].add_triangle_id(tri_id);
//Add the triangle
triangle_list.Add(new triangle_store(tri_id, e.start_pt, e.end_pt, second_edge.the_other_pt(e.end_pt)));
triangle_list[triangle_list.Count - 1].e1 = edge_list[third_edge_index];
triangle_list[triangle_list.Count - 1].e2 = edge_list[second_edge_index];
triangle_list[triangle_list.Count - 1].e3 = edge_list[edge_list.Count - 1];
}
add_to_local_list(e, is_triangle_found == true ? triangle_list[triangle_list.Count - 1] : null);
}
