private DividingVert LineIntersectPoint(Vector3 v1, Vector3 v2, Vector3 point)
{
Vector2 A = new Vector2(v1.X, v1.Z);
Vector2 B = new Vector2(v2.X, v2.Z);
Vector2 p = new Vector2(point.X, point.Z);
DividingVert edgePoint = new DividingVert();
//get the normalized line segment vector
Vector2 v = B - A;
v.Normalize();
//determine the point on the line segment nearest to the point p
float distanceAlongLine = Vector2.Dot(p, v) - Vector2.Dot(A, v);
Vector2 nearestPoint;
if (distanceAlongLine < 0)
{
//closest point is A
nearestPoint = A;
}
else if (distanceAlongLine > Vector2.Distance(A, B))
{
//closest point is B
nearestPoint = B;
}
else
{
//closest point is between A and B... A + d * ( ||B-A|| )
nearestPoint = A + distanceAlongLine * v;
}
//Calculate the distance between the two points
float actualDistance = Vector2.Distance(nearestPoint, p);
edgePoint.distance = actualDistance;
edgePoint.big = edgePoint.small = -1;
edgePoint.position = new Vector3(nearestPoint.X, 0, nearestPoint.Y);
return edgePoint;
}
public void Divide(DividingVert first, DividingVert second, out Board partOne, out Board partTwo)
{
//
/* ADD TEST TO FIND IF NOT ON THE SAME EDGE*/
//
Board part1 = new Board(texture,effect);
Board part2 = new Board(texture, effect);
int p1_pNum, p2_pNum;
p1_pNum = Math.Abs(first.big - second.small) + 3;
if ((first.big == vertNum - 1) && (second.small == 0))
p1_pNum -= 2;
p2_pNum = indices.Length - p1_pNum + 2;
Vector3[] p1_points = new Vector3[p1_pNum];
Vector2[] p1_texCords = new Vector2[p1_pNum];
p1_points[0] = first.position;
p1_texCords[0] = findTexCords(first);
p1_points[p1_pNum - 1] = second.position;
p1_texCords[p1_pNum - 1] = findTexCords(second);
for (int i = 0; i < p1_pNum - 2; i++)
{
p1_points[i + 1] = vertices[(first.big + i) % vertNum].Position;
p1_texCords[i + 1] = vertices[(first.big + i) % vertNum].TextureCoordinate;
}
Vector3[] p2_points = new Vector3[p2_pNum];
Vector2[] p2_texCords = new Vector2[p2_pNum];
p2_points[0] = second.position;
p2_texCords[0] = p1_texCords[p1_pNum - 1]; //alreadt calculated before a moment
p2_points[p2_pNum - 1] = first.position;
p2_texCords[p2_pNum - 1] = p1_texCords[0]; //alreadt calculated before a moment
for (int i = 0; i < p2_pNum - 2; i++)
{
p2_points[i + 1] = vertices[(second.big + i) % vertNum].Position;
p2_texCords[i + 1] = vertices[(second.big + i) % vertNum].TextureCoordinate;
}
part1.Initialize(p1_pNum, p1_points, p1_texCords);
part2.Initialize(p2_pNum, p2_points, p2_texCords);
// storing the smaller part in parOne , bigger -> partTwo
if (Vector3.Distance(center,part1.center) >= Vector3.Distance(center,part2.center))
{
partOne = part1;
partTwo = part2;
} else
{
partOne = part2;
partTwo = part1;
}
}
private Vector2 findTexCords(DividingVert divVert)
{
float smallX = vertices[divVert.small].Position.X;
float smallCordX = vertices[divVert.small].TextureCoordinate.X;
float bigX = vertices[divVert.big].Position.X;
float bigCordX = vertices[divVert.big].TextureCoordinate.X;
float vertX = divVert.position.X;
float smallZ = vertices[divVert.small].Position.Z;
float smallCordZ = vertices[divVert.small].TextureCoordinate.Y;
float bigZ = vertices[divVert.big].Position.Z;
float bigCordZ = vertices[divVert.big].TextureCoordinate.Y;
float vertZ = divVert.position.Z;
float xSize = Math.Abs(bigX - smallX);
float zSize = Math.Abs(bigZ - smallZ);
//the point from wich you maser the distance
float relativeX = (bigCordX < smallCordX ? bigX : smallX);
float relativeZ = (bigCordZ < smallCordZ ? bigZ : smallZ);
float xRel = (xSize != 0 ? Math.Abs(relativeX - vertX) / xSize : smallX);
float zRel = (zSize != 0 ? Math.Abs(relativeZ - vertZ) / zSize : smallZ);
float xCsize = Math.Abs(bigCordX - smallCordX);
float zCsize = Math.Abs(bigCordZ - smallCordZ);
float xCrel = (xCsize != 0 ? xRel * xCsize : smallCordX);
float zCrel = (zCsize != 0 ? zRel * zCsize : smallCordZ);
return new Vector2(xCrel, zCrel);
}
private Vector2 findTexCords(DividingVert divVert)
{
float smallX = vertices[divVert.small].Position.X;
float smallCordX = vertices[divVert.small].TextureCoordinate.X;
float bigX = vertices[divVert.big].Position.X;
float bigCordX = vertices[divVert.big].TextureCoordinate.X;
float vertX = divVert.position.X;
float smallZ = vertices[divVert.small].Position.Z;
float smallCordZ = vertices[divVert.small].TextureCoordinate.Y;
float bigZ = vertices[divVert.big].Position.Z;
float bigCordZ = vertices[divVert.big].TextureCoordinate.Y;
float vertZ = divVert.position.Z;
float xSize = Math.Abs(bigX - smallX);
float zSize = Math.Abs(bigZ - smallZ);
float xRel = (xSize != 0 ? Math.Abs(Math.Min(smallX, bigX) - vertX) / xSize : smallX);
float zRel = (zSize != 0 ? Math.Abs(Math.Min(smallZ, bigZ) - vertZ) / zSize : smallZ);
float xCsize = Math.Abs(bigCordX - smallCordX);
float zCsize = Math.Abs(bigCordZ - smallCordZ);
float xCrel = (xCsize != 0 ? xRel * xCsize : smallCordX);
float zCrel = (zCsize != 0 ? zRel * zCsize : smallCordZ);
return new Vector2(xCrel, zCrel);
//Vector2 distFromSmall = new Vector2(Math.Abs(divVert.position.X - vertices[divVert.small].Position.X),
// Math.Abs(divVert.position.Z - vertices[divVert.small].Position.Z));
//Vector2 sizeOfLine = new Vector2(Math.Abs(vertices[divVert.small].Position.X - vertices[divVert.big].Position.X),
// Math.Abs(vertices[divVert.small].Position.Z - vertices[divVert.big].Position.Z));
//distFromSmall /= new Vector2((sizeOfLine.X != 0 ? sizeOfLine.X : 1), (sizeOfLine.Y != 0 ? sizeOfLine.Y : 1));
//sizeOfLine = new Vector2(Math.Abs(vertices[divVert.small].TextureCoordinate.X -
// vertices[divVert.big].TextureCoordinate.X),
// Math.Abs(vertices[divVert.small].TextureCoordinate.Y - vertices[divVert.big].TextureCoordinate.Y));
//distFromSmall *= sizeOfLine;
//if (divVert.position.X == vertices[divVert.small].TextureCoordinate.X)
// distFromSmall.X = vertices[divVert.small].TextureCoordinate.X;
//if (vertices[divVert.small].TextureCoordinate.Y == vertices[divVert.big].TextureCoordinate.Y)
// distFromSmall.Y = vertices[divVert.small].TextureCoordinate.Y;
//return distFromSmall;
}
