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# Problem 2219. Wayfinding 2 - traversing

This is the second part of a series of assignments about wayfinding. The final goal is to be able to calculate the fastest route through a terrain of areas with different properties. The assignments will build on top of each other, gradually increasing the complexity, but guiding you stepwise towards the final goal. You can re-use code from preceding assignments to save some work. See [1].

How many times does AB cross the boundary of area F?

For this second assignment in this series you have to calculate how many times we cross the boundary of a single area while going from A to B. Our path from A to B is a straight line. And the area boundary is a closed polygon consisting of a finite number of straight segments.

The inputs of the function WayfindingBoundaryCrossing(AB,F) are a matrix AB of two columns, each with x-y coordinates, of our straight path from A (1st column) to B (2nd column), and a matrix F of columns with x- and y-coordinates, each column a subsequent node of the polygon boundary of the area. The last node is connected to the first.

``` AB = [
xA xB
yA yB
]```
``` F = [
[ x1 x2 ... xn ;
y1 y2 ... yn ]```

Your output n will be the number of times the line AB crosses the boundary of F. Note that AB may cross the boundary of F at a corner node of F.

### Solution Stats

25.0% Correct | 75.0% Incorrect
Last solution submitted on Dec 23, 2014

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