CollisionInfo AreCollisionPointsBehindBegin(Vector2 rightCollP, Vector2 leftCollP, Vector2 rightBeginP, Vector2 leftBeginP)
{
var btweenCollP = rightCollP + (leftCollP - rightCollP) * .5f;
var extendedRight = FixedStartPosition.Extend(rightCollP, 2000);
var extendedLeft = FixedStartPosition.Extend(leftCollP, 2000);
var intersectionsRight = new Geometry.Polygon.Line(FixedStartPosition.To2D(), extendedRight).
GetIntersectionPointsWithLineSegment(rightBeginP, leftBeginP);
var intersectionsleft = new Geometry.Polygon.Line(FixedStartPosition.To2D(), extendedLeft).
GetIntersectionPointsWithLineSegment(rightBeginP, leftBeginP);
bool behind =
!new Geometry.Polygon.Line(rightBeginP, leftBeginP).IsIntersectingWithLineSegment(
FixedStartPosition.To2D(),
btweenCollP);
CollisionInfo info = new CollisionInfo {
BehindStartLine = behind
};
if (intersectionsRight.Any() && intersectionsleft.Any())
{
info.New_RightCollPointOnStartLine = intersectionsRight[0];
info.New_LeftCollPointOnStartLine = intersectionsleft[0];
}
return(info);
}
public override Geometry.Polygon ToPolygon()
{
Vector2[] edges = GetEdgePoints();
Vector2 rightEdge = edges[0];
Vector2 leftEdge = edges[1];
var beginPoints = GetBeginEdgePoints(edges);
Vector2 rightBeginPoint = beginPoints[0];
Vector2 leftBeginPoint = beginPoints.Length == 1 ? Vector2.Zero : beginPoints[1];
if (leftBeginPoint.IsZero)
{
return(new Geometry.Polygon());
}
var baseTriangle = new Geometry.Polygon();
baseTriangle.Points.AddRange(new List <Vector2> {
FixedStartPosition.To2D(), rightEdge, leftEdge
});
var advancedTriangle = new Geometry.Polygon();
advancedTriangle.Points.AddRange(new List <Vector2> {
FixedStartPosition.To2D(), rightEdge
});
var dummyTriangle = advancedTriangle;
if (CollisionPoints.Any())
{
foreach (var collisionPoint in OrderCollisionPointsHorizontally(rightEdge))
{
var dir = collisionPoint - FixedStartPosition.To2D();
var leftColl = FixedStartPosition.To2D() + dir + dir.Perpendicular().Normalized() * 25;
var rightColl = FixedStartPosition.To2D() + dir + dir.Perpendicular2().Normalized() * 25;
var backToLineRight = FixedStartPosition.Extend(rightColl, FixedEndPosition.Distance(FixedStartPosition));
var backToLineLeft = FixedStartPosition.Extend(leftColl, FixedEndPosition.Distance(FixedStartPosition));
var earlyCollCheck_Left = backToLineLeft.Extend(leftColl, FixedEndPosition.Distance(FixedStartPosition));
var earlyCollCheck_Right = backToLineRight.Extend(rightColl, FixedEndPosition.Distance(FixedStartPosition));
Geometry.Polygon earlyCollisionRectangle = new Geometry.Polygon();
earlyCollisionRectangle.Points.AddRange(new List <Vector2>
{
leftColl, earlyCollCheck_Left, earlyCollCheck_Right, rightColl
});
bool EarlyCollision =
CollisionPoints.Any(x => x != collisionPoint && earlyCollisionRectangle.IsInside(x));
Func <Vector2, bool> outsideDummy = point => dummyTriangle.Points.Count < 3 || dummyTriangle.IsOutside(point);
if (baseTriangle.IsInside(rightColl) && baseTriangle.IsInside(leftColl) &&
outsideDummy(rightColl) && outsideDummy(leftColl) && !EarlyCollision &&
backToLineLeft.Distance(backToLineRight) >= OwnSpellData.Radius * 2)
{
CollisionInfo info = AreCollisionPointsBehindBegin(rightColl, leftColl, rightBeginPoint,
leftBeginPoint);
if (!info.BehindStartLine)
{
dummyTriangle.Points.Add(backToLineRight);
advancedTriangle.Points.Add(backToLineRight);
dummyTriangle.Points.Add(rightColl);
advancedTriangle.Points.Add(rightColl);
dummyTriangle.Points.Add(leftColl);
advancedTriangle.Points.Add(leftColl);
dummyTriangle.Points.Add(backToLineLeft);
advancedTriangle.Points.Add(backToLineLeft);
}
else //collision points behind startLine
{
leftColl = info.New_LeftCollPointOnStartLine;
rightColl = info.New_RightCollPointOnStartLine;
backToLineRight = FixedStartPosition.Extend(rightColl, FixedEndPosition.Distance(FixedStartPosition));
backToLineLeft = FixedStartPosition.Extend(leftColl, FixedEndPosition.Distance(FixedStartPosition));
dummyTriangle.Points.Add(backToLineRight);
advancedTriangle.Points.Add(backToLineRight);
dummyTriangle.Points.Add(rightColl);
advancedTriangle.Points.Add(rightColl);
dummyTriangle.Points.Add(leftColl);
advancedTriangle.Points.Add(leftColl);
dummyTriangle.Points.Add(backToLineLeft);
advancedTriangle.Points.Add(backToLineLeft);
}
}
}
}
advancedTriangle.Points.Add(leftEdge);
advancedTriangle.Points.RemoveAt(0);
advancedTriangle.Points.Insert(0, rightBeginPoint);
advancedTriangle.Points.Insert(0, leftBeginPoint);
return(advancedTriangle);
}