Problem inserting pre-ordered values to quadtree
- by Lucas Corrêa Feijó
There's this string containing B, W and G (standing for black, white and gray). It defines the pre-ordered path of the quadtree I want to build. I wrote this method for filling the QuadTree class I also wrote but it doesn't work, it inserts correctly until it reaches a point in the algorithm it needs to "return".
I use math quadrants convention order for insertion, such as northeast, northwest, southwest and southeast.
A quadtree has all it's leafs black or white and all the other nodes gray
The node used in the tree is called Node4T and has a char as data and 4 references to other nodes like itself, called, respectively NE, NW, SW, SE.
public void insert(char val)
{
if(root==null)
{
root = new Node4T(val);
}
else
{
insert(root, val);
}
}
public void insert(Node4T n, char c)
{
if(n.data=='G') // possible to insert
{
if(n.NE==null)
{
n.NE = new Node4T(c);
return;
}
else
{
insert(n.NE,c);
}
if(n.NW==null)
{
n.NW = new Node4T(c);
return;
}
else
{
insert(n.NW,c);
}
if(n.SW==null)
{
n.SW = new Node4T(c);
return;
}
else
{
insert(n.SW,c);
}
if(n.SE==null)
{
n.SE = new Node4T(c);
return;
}
else
{
insert(n.SE,c);
}
}
else // impossible to insert
{
}
}
The input "GWGGWBWBGBWBWGWBWBWGGWBWBWGWBWBGBWBWGWWWB" is given a char at a time to the insert method and then the print method is called, pre-ordered, and the result is "GWGGWBWBWBWGWBWBW".
How do I make it import the string correctly? Ignore the string reading process, suppose the method is called and it has to do it's job.
