| 47 |
self.epsg = epsg |
self.epsg = epsg |
| 48 |
self.params = params |
self.params = params |
| 49 |
|
|
| 50 |
def ForwardBBox(self, bbox): |
def _transform_bbox(self, trafo, bbox): |
|
"""Return the bounding box of the corners of the bounding box bbox |
|
|
""" |
|
| 51 |
# This is not really the correct way to determine the bbox of a |
# This is not really the correct way to determine the bbox of a |
| 52 |
# projected shape, but for now it works well enough |
# projected bbox, but for now it works well enough |
| 53 |
llx, lly, urx, ury = bbox |
llx, lly, urx, ury = bbox |
| 54 |
xs = []; ys = [] |
xs = []; ys = [] |
| 55 |
x, y = self.Forward(llx, lly) |
for x, y in ((llx, lly), (llx, ury), (urx, lly), (urx, ury)): |
| 56 |
xs.append(x); ys.append(y) |
x, y = trafo(x, y) |
| 57 |
x, y = self.Forward(llx, ury) |
xs.append(x); ys.append(y) |
|
xs.append(x); ys.append(y) |
|
|
x, y = self.Forward(urx, ury) |
|
|
xs.append(x); ys.append(y) |
|
|
x, y = self.Forward(urx, lly) |
|
|
xs.append(x); ys.append(y) |
|
|
|
|
| 58 |
return min(xs), min(ys), max(xs), max(ys) |
return min(xs), min(ys), max(xs), max(ys) |
| 59 |
|
|
| 60 |
|
def ForwardBBox(self, bbox): |
| 61 |
|
"""Return the bounding box of the corners of the bounding box bbox |
| 62 |
|
""" |
| 63 |
|
return self._transform_bbox(self.Forward, bbox) |
| 64 |
|
|
| 65 |
|
def InverseBBox(self, bbox): |
| 66 |
|
return self._transform_bbox(self.Inverse, bbox) |
| 67 |
|
|
| 68 |
def GetName(self): |
def GetName(self): |
| 69 |
"""Return the name of the projection.""" |
"""Return the name of the projection.""" |
| 70 |
return self.name |
return self.name |
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