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# Copyright (c) 2001, 2002, 2003 by Intevation GmbH |
# Copyright (c) 2001, 2002, 2003, 2004 by Intevation GmbH |
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# Authors: |
# Authors: |
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# Bernhard Herzog <[email protected]> |
# Bernhard Herzog <[email protected]> |
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# Jonathan Coles <[email protected]> |
# Jonathan Coles <[email protected]> |
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# (layer_class, draw_function) pairs. If the renderer has to draw a |
# (layer_class, draw_function) pairs. If the renderer has to draw a |
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# non-builtin layer type, i.e. a layer that is not a subclass of Layer |
# non-builtin layer type, i.e. a layer that is not a subclass of Layer |
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# or RasterLayer, it iterates through that list, tests whether the layer |
# or RasterLayer, it iterates through that list, tests whether the layer |
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# to be drawin is an instance of layer_class and if so calls |
# to be drawn is an instance of layer_class and if so calls |
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# draw_function with the renderer and the layer as arguments. Since |
# draw_function with the renderer and the layer as arguments. Since |
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# drawing is done incrementally, the draw_function should return an |
# drawing is done incrementally, the draw_function should return an |
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# iterable. The easiest way is to simply implement the draw_function as |
# iterable. The easiest way is to simply implement the draw_function as |
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function should return an iterable. The easiest way is to simply |
function should return an iterable. The easiest way is to simply |
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implement the draw_function as a generator and to yield True in |
implement the draw_function as a generator and to yield True in |
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suitable places, or to return the empty tuple if it's not possible |
suitable places, or to return the empty tuple if it's not possible |
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to do the rendering in incrementally. |
to do the rendering incrementally. |
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""" |
""" |
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_renderer_extensions.append((layer_class, function)) |
_renderer_extensions.append((layer_class, function)) |
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