Splitting up stuff.cc.

New: colour.cc, coord.cc, coordit.cc, random.cc, rng.cc.

1 files changed, 76 insertions, 0 deletions

diff --git a/crawl-ref/source/random.h b/crawl-ref/source/random.h
new file mode 100644
index 0000000000..b1bdbe5021
--- /dev/null
+++ b/crawl-ref/source/random.h
@@ -0,0 +1,76 @@
+#ifndef RANDOM_H
+#define RANDOM_H
+
+#include "rng.h"
+
+bool coinflip();
+int div_rand_round( int num, int den );
+int div_round_up( int num, int den );
+bool one_chance_in(int a_million);
+bool x_chance_in_y(int x, int y);
+int random2(int max);
+int maybe_random2(int x, bool random_factor);
+int random_range(int low, int high);
+int random_range(int low, int high, int nrolls);
+const char* random_choose_string(const char* first, ...);
+int random_choose(int first, ...);
+int random_choose_weighted(int weight, int first, ...);
+int random2avg(int max, int rolls);
+int bestroll(int max, int rolls);
+int random2limit(int max, int limit);
+int binomial_generator(unsigned n_trials, unsigned trial_prob);
+int fuzz_value(int val, int lowfuzz, int highfuzz, int naverage = 2);
+int roll_dice(int num, int size);
+
+struct dice_def
+{
+    int num;
+    int size;
+
+    dice_def(int n = 0, int s = 0) : num(n), size(s) {}
+    int roll() const;
+};
+
+dice_def calc_dice(int num_dice, int max_damage);
+void scale_dice(dice_def &dice, int threshold = 24);
+
+class rng_save_excursion
+{
+public:
+    rng_save_excursion(long seed) { push_rng_state(); seed_rng(seed); }
+    rng_save_excursion()          { push_rng_state(); }
+    ~rng_save_excursion()         { pop_rng_state(); }
+};
+
+template<typename Iterator>
+int choose_random_weighted(Iterator beg, const Iterator end)
+{
+    ASSERT(beg < end);
+
+#ifdef DEBUG
+    int times_set = 0;
+#endif
+
+    int totalweight = 0;
+    int count = 0, result = 0;
+    while (beg != end)
+    {
+        totalweight += *beg;
+        if (random2(totalweight) < *beg)
+        {
+            result = count;
+#ifdef DEBUG
+            times_set++;
+#endif
+        }
+        ++count;
+        ++beg;
+    }
+#ifdef DEBUG
+    ASSERT(times_set > 0);
+#endif
+    return result;
+}
+
+#endif
+