/// <summary>
/// </summary>
/// <param name="p">
/// </param>
/// <returns>
/// </returns>
internal static List<PlayfieldWalls> ParseWalls(byte[] p)
{
BinaryReader br = new BinaryReader(new MemoryStream(p));
int counter1 = br.ReadInt32();
List<PlayfieldWalls> walls = new List<PlayfieldWalls>(100);
while (counter1 > 0)
{
PlayfieldWalls pfws = new PlayfieldWalls();
br.ReadInt32(); // Filler int32?
int counter2 = br.ReadInt32();
while (counter2 > 0)
{
PlayfieldWall pfw = new PlayfieldWall();
pfw.DestinationPlayfield = br.ReadInt16();
pfw.DestinationIndex = br.ReadByte();
pfw.Flags = br.ReadByte();
pfw.X = br.ReadSingle();
pfw.Y = br.ReadSingle();
pfw.Z = br.ReadSingle();
pfws.Walls.Add(pfw);
counter2--;
}
walls.Add(pfws);
counter1--;
}
return walls;
}
/// <summary>
/// </summary>
/// <param name="w1">
/// </param>
/// <param name="w2">
/// </param>
/// <param name="x">
/// </param>
/// <param name="z">
/// </param>
/// <returns>
/// </returns>
private static float MinimalDistance(PlayfieldWall w1, PlayfieldWall w2, float x, float z)
{
if (DotProduct(w1, w2, x, z) > 0)
{
return 15.0f;
}
if (DotProduct(w2, w1, x, z) > 0)
{
return 15.0f;
}
return Math.Abs(CrossProduct(w1, w2, x, z) / Distance(w1, w2.X, w2.Z));
}
/// <summary>
/// </summary>
/// <param name="w1">
/// </param>
/// <param name="x">
/// </param>
/// <param name="z">
/// </param>
/// <returns>
/// </returns>
private static float Distance(PlayfieldWall w1, float x, float z)
{
float d1 = w1.X - x;
float d2 = w1.Z - z;
return (float)Math.Sqrt(d1 * d1 + d2 * d2);
}
/// <summary>
/// </summary>
/// <param name="w1">
/// </param>
/// <param name="w2">
/// </param>
/// <param name="x">
/// </param>
/// <param name="z">
/// </param>
/// <returns>
/// </returns>
private static float DotProduct(PlayfieldWall w1, PlayfieldWall w2, float x, float z)
{
float[] AB = new float[2];
float[] BC = new float[2];
AB[0] = w2.X - w1.X;
AB[1] = w2.Z - w1.Z;
BC[0] = x - w2.X;
BC[1] = z - w2.Z;
float dot = AB[0] * BC[0] + AB[1] * BC[1];
return dot;
}
/// <summary>
/// </summary>
/// <param name="w1">
/// </param>
/// <param name="w2">
/// </param>
/// <param name="x">
/// </param>
/// <param name="z">
/// </param>
/// <returns>
/// </returns>
private static float CrossProduct(PlayfieldWall w1, PlayfieldWall w2, float x, float z)
{
float[] AB = new float[2];
float[] AC = new float[2];
AB[0] = w2.X - w1.X;
AB[1] = w2.Z - w1.Z;
AC[0] = x - w1.X;
AC[1] = z - w1.Z;
float cross = AB[0] * AC[1] - AB[1] * AC[0];
return cross;
}
