HTML and CSS Reference
In-Depth Information
A* Taking Diagonal Moves into Account
For
Example 8-15
,
we will be making changes to
Example 8-14
to add in diagonal movement
to the A* path.
So far, each of our examples has used the
astar.js
functions, which ignore diagonal move-
ments between nodes. We can easily add this capability.
Example 8-15
does this with one
simple change. We will be changing the
false
in the A* search function to
true
:
//For example 8-15 we will add true to the end of the search function
var
var
result
=
astar
.
search
(
graph
.
nodes
,
start
,
end
,
true
true
);
By simply changing
false
to
true
at the end of the call to the
astar.search()
, we can
change the result node path dramatically.
Figure 8-15
shows the path difference.
Figure 8-15. A* applied to the 15x15 tile map with diagonals
Eachnodeonthemovabletileshasthesameweight(
1
).WhenA*calculatestheshortestnode
path, it does so by taking these weights into account. Next we will add in some nodes with a
higher weight value.
Example 8-15. Larger A* example with diagonals
