80 lines
2.5 KiB
JavaScript
80 lines
2.5 KiB
JavaScript
import {H, PROJECTILE_ITERATIONS_PER_FRAME, PROJECTILE_ITERATION_PROGRESS, PROJECTILE_MAX_SOUND_FREQUENCY, PROJECTILE_MIN_SOUND_FREQUENCY, PROJECTILE_POWER_REDUCTION_FACTOR, PROJECTILE_WIND_REDUCTION_FACTOR, WEAPON_TYPES} from './constants.js';
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import {drawLineVirtual} from './gfx.js';
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import {isTank, createParticles} from './main.js';
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import {deg2rad, parable} from './math.js';
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import {audio, createOsc} from './sound.js';
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import {isTerrain} from './terrain.js';
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import {EXPLOSION_TYPES} from './weapons.js';
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export const PROJECTILE_TYPES = {
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normal: {
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create(spec, player, weapon, ox, oy, a, p, wind) {
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const osc = createOsc('sine');
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osc.start();
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return {
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type: 'normal',
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player, weapon,
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x:ox, y:oy, ox, oy, a, p,
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t: 0, osc, wind,
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};
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},
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stop(projectile) {
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projectile.osc.stop(0);
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},
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update(projectile, terrain, trajectories, explosions) {
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const prevProjectile = {...projectile};
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const {weapon, player, wind} = projectile;
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const weaponType = WEAPON_TYPES[weapon.type];
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let exploded = false;
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for (let i=0; i<PROJECTILE_ITERATIONS_PER_FRAME; i++) {
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const {ox, oy, a, p, t} = projectile;
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const [x, y] = parable(
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t, ox, oy, deg2rad(180+a),
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p / PROJECTILE_POWER_REDUCTION_FACTOR,
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wind / PROJECTILE_WIND_REDUCTION_FACTOR,
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);
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projectile.x = x;
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projectile.y = y;
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projectile.t += PROJECTILE_ITERATION_PROGRESS;
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const f = (
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(1 - (1 / H * y)) *
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(PROJECTILE_MAX_SOUND_FREQUENCY - PROJECTILE_MIN_SOUND_FREQUENCY) +
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PROJECTILE_MIN_SOUND_FREQUENCY
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);
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projectile.osc.frequency.setValueAtTime(f, audio.currentTime);
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if (
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y > H ||
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isTank(x, y) ||
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isTerrain(terrain, x, y)
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) {
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const explosionSpec = weaponType.explosion;
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const explosionType = EXPLOSION_TYPES[explosionSpec.type];
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explosions.push(explosionType.create(explosionSpec, x, y));
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// @ts-ignore: canvas color hack
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createParticles(x, y, p, terrain.color);
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exploded = true;
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break;
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}
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}
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let trajectory = drawLineVirtual(
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prevProjectile.x, prevProjectile.y,
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projectile.x, projectile.y, player.c,
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);
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trajectory
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.slice(0, trajectory.length-1) // Cut last pixel to prevent overlap
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.map(x => ({...x, a:255})) // Add alpha to all lines
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.forEach(x => trajectories.push(x));
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return !exploded;
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},
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}
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}
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