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Added safety margin to AI to avoid numerical precision errors on AP estimate

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This commit is contained in:
Michaël Lemaire 2015-02-20 01:00:00 +01:00
parent 86ff98707d
commit b60aa3fd18
2 changed files with 19 additions and 1 deletions
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7
src/scripts/game/ai/BullyAI.ts
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@ -24,8 +24,13 @@ module SpaceTac.Game.AI {
// Basic Artificial Intelligence, with a tendency to move forward and shoot the nearest enemy
export class BullyAI extends AbstractAI {
// Safety margin in moves to account for floating-point rounding errors
move_margin: number;
constructor(fleet: Fleet) {
super(fleet);
this.move_margin = 0.1;
}
protected initWork(): void {
@ -99,7 +104,7 @@ module SpaceTac.Game.AI {
return null;
} else {
engine = engines[0];
var move_distance = distance - weapon.distance;
var move_distance = distance - weapon.distance + this.move_margin;
var move_ap = engine.ap_usage * move_distance / engine.distance;
if (move_ap > remaining_ap) {
// Not enough AP to move in range

13
src/scripts/game/ai/specs/BullyAI.spec.ts
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@ -52,6 +52,7 @@ module SpaceTac.Game.AI.Specs {
var enemy = new Ship();
var ai = new BullyAI(ship.fleet);
ai.ship = ship;
ai.move_margin = 0;
var weapon = new Equipment(SlotType.Weapon);
weapon.ap_usage = 2;
weapon.distance = 3;
@ -78,6 +79,17 @@ module SpaceTac.Game.AI.Specs {
expect(result.target).toBe(enemy);
expect(result.weapon).toBe(weapon);
// enemy out of range, but moving can bring it in range, except for the safety margin
ai.move_margin = 0.1;
ship.ap_current.set(8);
ship.arena_x = 1;
ship.arena_y = 0;
enemy.arena_x = 6;
enemy.arena_y = 0;
result = ai.checkBullyMove(enemy, weapon);
expect(result).toBeNull();
ai.move_margin = 0;
// enemy totally out of range
ship.ap_current.set(8);
ship.arena_x = 1;
@ -161,6 +173,7 @@ module SpaceTac.Game.AI.Specs {
battle.fleets[1].addShip(ship2);
var ai = new BullyAI(ship1.fleet);
ai.move_margin = 0;
ai.async = false;
ai.ship = ship1;