divide the rectangle into the strip in matlab

Let' say I have the matrix P contain 2D point data(20 points):

1	2	
1.5	2	
2	2	
2.5	2	
3	2	
3.5	2	
4	2	
4.5	2	
5	2	
5.5	2	
1	4	
1.5	4	
2.5	4	
3.5	4	
4	4	
4.5	4	
5	4	
5.5	4	
4.5	3	
1.5	3

And, from that data, I can draw the boundary of data. The result is rectangular shape as bellow image:

And then, I want to divide the rectangle into the strip with user-defined width as follow: