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Add a little complexity to the new pseudo-random used for road windiness...

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...by the random-map generator. The previous one had some patterns
(probably not humanly visible but maybe some weird flat map could
expose them).

Also now skip this evaluation when we don't use road windiness.
This commit is contained in:
Ali El Gariani 2008-02-03 03:40:07 +00:00
parent f9cc81345c
commit 093c91d191
1 changed files with 9 additions and 4 deletions
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13
src/mapgen.cpp
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@ -392,12 +392,17 @@ double road_path_calculator::cost(const location& /*src*/, const location& loc,
double windiness = 1.0;
if (windiness_ > 0) {
// simplified version of pseudo_random from builder.cpp
if (windiness_ > 1) {
// modified pseudo_random taken from builder.cpp
unsigned int a = (loc.x + 92872973) ^ 918273;
unsigned int b = (loc.y + 1672517) ^ 128123;
unsigned int random = a*b + a + b;
windiness += static_cast<double>(random % windiness_);
unsigned int c = a*b + a + b;
unsigned int random = c*c;
// this is just "big random number modulo windiness_"
// but avoid the "modulo by a low number (like 2)"
// because it can increase arithmetic patterns
int noise = random % (windiness_ * 137) / 137;
windiness += noise;
}
const t_translation::t_letter c = map_[loc.x][loc.y];