getXYPath.m

function [ weight ] = getXYPath(currX, currY, destX, destY, boxes)
    
    weight = 0;
    blocked = 0;
    
    % do this until Y values are same
    while( currX ~= destX)
        % go right or left
        if ( currX < destX)
            currX = currX + 1;                                
        else
            currX = currX - 1;
        end
        
        % check if a specific point exist in the polygon
        blocked = isPathBlocked( boxes, currX, currY);
        
        % if path is blocked, break out of loop     
        if ( blocked)
            weight = 0;
            break;
        end
        % if path not blocked, increment weight        
        weight = weight + 1;
    end
    
    % x-coordinates same, now go up/down
    if ( blocked == 0)
        weight = goUpOrDown( currX, currY, destX, destY, boxes, weight); 
    end
end