def __init__(self):
p = _pi
# Transform from geography in radians to tile coordinates
t = deriveTransformation(-p, p/2, 0, 0, p, p/2, 2, 0, -p, -p/2, 0, 1)
LinearProjection.__init__(self, 0, t)
def __init__(self):
p = _pi
# Transform from geography in radians to tile coordinates
t = deriveTransformation(-p, p/2, 0, 0, p, p/2, 2, 0, -p, -p/2, 0, 1)
LinearProjection.__init__(self, 0, t)
def __init__(self, srs, resolutions, tile_size=256, transformation=Transformation(1, 0, 0, 0, 1, 0)):
"""
Creates a new instance with the projection specified in srs, which is in Proj4
format.
"""
self.resolutions = resolutions
self.tile_size = tile_size
self.proj = Proj(srs)
self.srs = srs
self.tile_dimensions = \
[self.tile_size * r for r in self.resolutions]
try:
self.base_zoom = self.resolutions.index(1.0)
except ValueError:
raise TileStache.Core.KnownUnknown('No zoom level with resolution 1.0')
LinearProjection.__init__(self, self.base_zoom, transformation)
def unproject(self, point, scale):
p = LinearProjection.unproject(self, point)
p.x = p.x / scale
p.y = p.y / scale
return p
def project(self, point, scale):
p = LinearProjection.project(self, point)
p.x = p.x * scale
p.y = p.y * scale
return p