30 lines
982 B
Text
30 lines
982 B
Text
# pick.ludic - the next spell, drawn from weights, and how long one lasts. The weights are the
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# kind's own unless the world leans on them (a season, a wet week); every draw is this package's
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function wx_odds(from: int) -> []float {
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return WeatherWorld.odds(from)
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}
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# the kind a set of weights lands on; no weights (or all zero) keeps the kind it came from
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export function weather_draw_from(w: []float, from: int, roll: float) -> int {
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if w == null { return from }
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var total = 0.0
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for k in 0 .. len(w) { if w[k] > 0.0 { total = total + w[k] } }
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if not (total > 0.0) { return from }
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var at = roll * total
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for k in 0 .. len(w) {
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if w[k] > 0.0 {
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if at < w[k] { return k }
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at = at - w[k]
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}
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}
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return len(w) - 1
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}
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function wx_pick_next(from: int) -> int {
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return weather_draw_from(wx_odds(from), from, rng_float(wx_dice))
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}
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function wx_spell_hours(k: int) -> float {
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let kd = wx_kinds[k]
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return rng_span(wx_dice, kd.spell_lo, kd.spell_hi)
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}
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