def resize(self, new_width, new_height):
"""
Redo the corner points of this box to reflect new C{width} and
C{height}, maintaining the same center point as this box currently
has.
@param new_width: new width of box
@type new_width: C{float}
@param new_height: new height of box
@type new_height: C{float}
"""
mid_lat = (self.min_lat + self.max_lat) / 2.0
mid_lon = (self.min_lon + self.max_lon) / 2.0
dist = new_height / 2.0
self.min_lat, lon = pt_dist_from_pt(mid_lat, mid_lon, dist, 180) # down
self.max_lat, lon = pt_dist_from_pt(mid_lat, mid_lon, dist, 0) # up
dist = new_width / 2.0
lat, self.min_lon = pt_dist_from_pt(mid_lat, mid_lon, dist, 270) # left
lat, self.max_lon = pt_dist_from_pt(mid_lat, mid_lon, dist, 90) # right
def pt_dist_from(self, distance, true_course):
"""
Calculate a point C{distance} statute miles from this point
along a course C{true_course} degrees
Some useful C{true_course} values:
- 0.0 - north
- 90.0 - east
- 180.0 - south
- 270.0 - west
@param distance: distance from this point in statute miles
@type distance: C{float}
@param true_course: true course from this point in degrees
@type true_course: C{float}
@return: Point object representing calculated point
@rtype: L{Point}
"""
return pt_dist_from_pt(self.lat, self.lon, distance, true_course)
