"""
    NodePathCollection-extensions module: contains methods to extend
    functionality of the NodePathCollection class
    """

    # For iterating over children
    def asList(self):
        """Converts a NodePathCollection into a list"""
        if self.isEmpty():
            return []
        else:
            npList = []
            for nodePathIndex in range(self.getNumPaths()):
                npList.append(self.getPath(nodePathIndex))
            return npList

    def getTightBounds(self):
        from pandac import Point3
        
        if self.getNumPaths() == 0:
            return (Point3.Point3(0), Point3.Point3(0))

        v1, v2 = self.getPath(0).getTightBounds()
        for i in range(1, self.getNumPaths()):
            v1x, v2x = self.getPath(i).getTightBounds()
            v1 = Point3.Point3(min(v1[0], v1x[0]),
                               min(v1[1], v1x[1]),
                               min(v1[2], v1x[2]))
            v2 = Point3.Point3(max(v2[0], v2x[0]),
                               max(v2[1], v2x[1]),
                               max(v2[2], v2x[2]))
        
        return v1, v2