/// <summary>
/// Adds shapes of entity to collision collection.
/// </summary>
/// <param name="shapedEntity"></param>
public void Add(IShapedEntity shapedEntity)
{
if (shapedEntity.Shapes == null || shapedEntity.Shapes.Count == 0 || !shapedEntity.IsCollision)
return;
foreach (var points in shapedEntity.Shapes)
{
var line1 = new LinePath(points[0], points[1]);
var line2 = new LinePath(points[1], points[2]);
var line3 = new LinePath(points[2], points[3]);
var line4 = new LinePath(points[3], points[0]);
lock (_tree)
{
_tree.Insert(line1);
_tree.Insert(line2);
_tree.Insert(line3);
_tree.Insert(line4);
}
lock (_reference)
{
if (!_reference.ContainsKey(shapedEntity.EntityId))
_reference[shapedEntity.EntityId] = new List<LinePath>();
_reference[shapedEntity.EntityId].Add(line1);
_reference[shapedEntity.EntityId].Add(line2);
_reference[shapedEntity.EntityId].Add(line3);
_reference[shapedEntity.EntityId].Add(line4);
}
}
}
/// <summary>
/// Adds shape to collisions, referenced by the given ident.
/// </summary>
/// <param name="ident"></param>
/// <param name="shape"></param>
public void Add(string ident, ShapeData shape)
{
var p1 = new Point(shape.X1, shape.Y1);
var p2 = new Point(shape.X2, shape.Y2);
var p3 = new Point(shape.X3, shape.Y3);
var p4 = new Point(shape.X4, shape.Y4);
var line1 = new LinePath(p1, p2);
var line2 = new LinePath(p2, p3);
var line3 = new LinePath(p3, p4);
var line4 = new LinePath(p4, p1);
lock (_tree)
{
_tree.Insert(line1);
_tree.Insert(line2);
_tree.Insert(line3);
_tree.Insert(line4);
}
if (ident == null)
{
return;
}
lock (_reference)
{
if (!_reference.ContainsKey(ident))
{
_reference[ident] = new List <LinePath>();
}
_reference[ident].Add(line1);
_reference[ident].Add(line2);
_reference[ident].Add(line3);
_reference[ident].Add(line4);
}
}
/// <summary>
/// Adds shapes of entity to collision collection.
/// </summary>
/// <param name="shapedEntity"></param>
public void Add(IShapedEntity shapedEntity)
{
if (shapedEntity.Shapes == null || shapedEntity.Shapes.Count == 0 || !shapedEntity.IsCollision)
{
return;
}
foreach (var points in shapedEntity.Shapes)
{
var line1 = new LinePath(points[0], points[1]);
var line2 = new LinePath(points[1], points[2]);
var line3 = new LinePath(points[2], points[3]);
var line4 = new LinePath(points[3], points[0]);
lock (_tree)
{
_tree.Insert(line1);
_tree.Insert(line2);
_tree.Insert(line3);
_tree.Insert(line4);
}
lock (_reference)
{
if (!_reference.ContainsKey(shapedEntity.EntityId))
{
_reference[shapedEntity.EntityId] = new List <LinePath>();
}
_reference[shapedEntity.EntityId].Add(line1);
_reference[shapedEntity.EntityId].Add(line2);
_reference[shapedEntity.EntityId].Add(line3);
_reference[shapedEntity.EntityId].Add(line4);
}
}
}
/// <summary>
/// Returns true if the path between from and to intersects with
/// anything and returns the intersection position via out.
/// </summary>
/// <param name="region"></param>
/// <param name="from"></param>
/// <param name="to"></param>
/// <param name="intersection"></param>
/// <returns></returns>
public bool Find(Position from, Position to, out Position intersection)
{
intersection = to;
var x1 = from.X;
var y1 = from.Y;
var x2 = to.X;
var y2 = to.Y;
var intersections = new List <Position>();
// Query lines
var rect = new LinePath(from, to).Rect;
// Extend rect a little, so there's no chance to miss any lines.
rect.X -= 100;
rect.Y -= 100;
rect.Width += 200;
rect.Height += 200;
List <LinePath> lines;
lock (_tree)
lines = _tree.Query(rect);
// Get intersections
foreach (var line in lines)
{
var x3 = line.P1.X;
var y3 = line.P1.Y;
var x4 = line.P2.X;
var y4 = line.P2.Y;
Position inter;
if (this.FindIntersection(x1, y1, x2, y2, x3, y3, x4, y4, out inter))
{
intersections.Add(inter);
}
}
// No collisions
if (intersections.Count < 1)
{
return(false);
}
// One collision
if (intersections.Count == 1)
{
intersection = intersections[0];
return(true);
}
// Select nearest intersection
double distance = double.MaxValue;
foreach (var inter in intersections)
{
var interDist = Math.Pow(x1 - inter.X, 2) + Math.Pow(y1 - inter.Y, 2);
if (interDist < distance)
{
intersection = inter;
distance = interDist;
}
}
return(true);
}
