public static IntRect GetBounds(this Polygons polygons)
{
var totalBounds = new IntRect(long.MaxValue, long.MaxValue, long.MinValue, long.MinValue);
foreach (var polygon in polygons)
{
var polyBounds = polygon.GetBounds();
totalBounds = totalBounds.ExpandToInclude(polyBounds);
}
return(totalBounds);
}
private void CollideWithCorners(Vector2 la, Vector2 a, Vector2 lb, Vector2 b, int bend, int recursion)
{
//检测递归次数
if (recursion > 10)
{
return;
}
//创建一个包括a、b、lb的矩形
IntRect intRect = IntRect.MakeFromIntVector2(room.GetTilePosition(la));
intRect.ExpandToInclude(room.GetTilePosition(a));
intRect.ExpandToInclude(room.GetTilePosition(lb));
intRect.ExpandToInclude(room.GetTilePosition(b));
intRect.Grow(1);
List <Corner> cornerLst = new List <Corner>();
//左->右、下->上 逐Tile遍历
for (int left = intRect.left; left <= intRect.right; ++left)
{
for (int bottom = intRect.bottom; bottom <= intRect.top; ++bottom)
{
if (room.GetTile(left, bottom).Solid)
{
if (!room.GetTile(left - 1, bottom).Solid)
{
if (!room.GetTile(left, bottom - 1).Solid &&
!room.GetTile(left - 1, bottom - 1).Solid)
{
//左下角拐角地形
cornerLst.Add(new Corner(FloatRect.CornerLabel.D, room.MiddleOfTile(left, bottom) + new Vector2(-10f - thickness, -10f - thickness)));
}
if (!room.GetTile(left, bottom + 1).Solid &&
!room.GetTile(left - 1, bottom + 1).Solid)
{
//左上角拐角地形
cornerLst.Add(new Corner(FloatRect.CornerLabel.A, room.MiddleOfTile(left, bottom) + new Vector2(-10f - thickness, 10f + thickness)));
}
}
if (!room.GetTile(left + 1, bottom).Solid)
{
//右下角拐角地形
if (!room.GetTile(left, bottom - 1).Solid&& !room.GetTile(left + 1, bottom - 1).Solid)
{
cornerLst.Add(new Corner(FloatRect.CornerLabel.C, room.MiddleOfTile(left, bottom) + new Vector2(10f + thickness, -10f - thickness)));
}
//右上角拐角地形
if (!room.GetTile(left, bottom + 1).Solid&& !room.GetTile(left + 1, bottom + 1).Solid)
{
cornerLst.Add(new Corner(FloatRect.CornerLabel.B, room.MiddleOfTile(left, bottom) + new Vector2(10f + thickness, 10f + thickness)));
}
}
}
}
}
Corner?nullable = new Rope.Corner?();
float f = float.MaxValue;
foreach (Corner corner in cornerLst)
{
if (DoesLineOverlapCorner(a, b, corner) && corner.pos != la && (corner.pos != a && corner.pos != lb) && corner.pos != b && ((Utils.PointInTriangle(corner.pos, a, la, b) || Utils.PointInTriangle(corner.pos, a, lb, b) || (Utils.PointInTriangle(corner.pos, a, la, lb) || Utils.PointInTriangle(corner.pos, la, lb, b))) && Mathf.Abs(Utils.DistanceToLine(corner.pos, la, lb)) < (double)Mathf.Abs(f)))
{
nullable = new Rope.Corner?(corner);
f = Utils.DistanceToLine(corner.pos, lastA, lastB);
}
}
if (!nullable.HasValue)
{
return;
}
Vector2 pos = nullable.Value.pos;
//增加绳子与拐点碰撞点
bends.Insert(bend, nullable.Value);
Vector2 vector2 = Utils.ClosestPointOnLine(la, lb, pos);
CollideWithCorners(vector2, pos, lb, b, bend + 1, recursion + 1);
CollideWithCorners(la, a, vector2, pos, bend, recursion + 1);
}