Sébastien QUEROLandClaude Opus 5.5
397dcef44c
The Old, Good and Super Rods run FishFunction facing water: the map's fish group and Fish pick no fish, no bite, or a Pokémon from FishGroups and the time of day's TimeFishGroups. The player casts and jiggles with the fishing frames drawn from LoadFishingGFX's tiles, shows "!" on a bite, and the hooked Pokémon attacks as BATTLETYPE_FISH. Facing pieces now use signed offsets, which the rod above and left of the player needs. Wild Magikarp no longer stop a battle: LoadEnemyMon redraws their DVs through CalcMagikarpLength and its filters, as the original does. The length routine matches the original in the reference emulator. Part of #27 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
46 lines
1.6 KiB
TypeScript
46 lines
1.6 KiB
TypeScript
import type { RomReader } from "../rom/reader";
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import { OVERWORLD } from "../rom/profile";
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/** The fishing rods' encounters (engine/events/fish.asm and
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* data/wild/fish.asm). */
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export interface FishMon {
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species: number;
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level: number;
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}
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/** FISHGROUP_DATA_LENGTH: the bite chance, then a table per rod. */
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const FISHGROUP_DATA_LENGTH = 7;
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/** NITE_F: TimeFishGroups' second species from the night on. */
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const NITE_F = 2;
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/** Fish: rod 0 (Old), 1 (Good) or 2 (Super) in FishGroups entry `group`
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* (FISHGROUP_*, never FISHGROUP_NONE). A bite when Random falls below the
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* group's chance, then the first entry whose chance a second Random does
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* not exceed; species 0 picks the time of day's TimeFishGroups entry.
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* Undefined when nothing bites. GetFishGroupIndex's swarm groups need
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* DAILYFLAGS1_FISH_SWARM_F and wFishingSwarmFlag, which only trainer calls
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* set; they are not ported, so the map's own group is used. */
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export function fish(
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r: RomReader,
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group: number,
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rod: number,
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timeOfDay: number,
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random: () => number,
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): FishMon | undefined {
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const entry = OVERWORLD.FishGroups + (group - 1) * FISHGROUP_DATA_LENGTH;
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if (random() >= r.byte(entry)) return undefined;
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let p = r.near(entry + 1 + rod * 2, r.bank(entry));
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const roll = random();
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while (roll > r.byte(p)) p += 3;
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let species = r.byte(p + 1),
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level = r.byte(p + 2);
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if (!species) {
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// .TimeEncounter: the level byte indexes TimeFishGroups.
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const time =
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OVERWORLD.TimeFishGroups + level * 4 + (timeOfDay >= NITE_F ? 2 : 0);
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species = r.byte(time);
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level = r.byte(time + 1);
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}
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return { species, level };
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}
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