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Almar Klein
798bea7251
Installed a few hooks to allow more flexibility in subclasses, refactored traceback() to allow obtaining tracebacks fast during front evolution, and moved some initializations to reset(). Full list: * integer division in calculating indices * traceback_offsets use -2 for uninitialized, -1 for seed point. In that we we can distinguish between these two cases in traceback() * Clearing of traceback_offset, cumulative_costs, pushing start positions into the heap, are now all done in reset() * Reset is called every time that find_cost is called. * Add hook _goal_reached() * Add hook _examine_neighbor() * Add hook _update_node() * Replace while loop with a for-loop to prevent infinite looping in case of a bug. * Split traceback() in two functions to allow getting a flat traceback fast. traceback() calles these two private functions and behaves as just before.