90 lines
2.3 KiB
TypeScript
90 lines
2.3 KiB
TypeScript
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import type { Vec3 } from "../math/Vec3"
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import { CollisionWorld, type CollisionWorld as World } from "./CollisionWorld"
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export type Character = {
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position: Vec3
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yaw: number
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velocityY: number
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onGround: boolean
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}
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export type CharacterInput = {
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forward: number
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right: number
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jump: boolean
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run: boolean
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}
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export type CharacterConfig = {
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radius: number
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speed: number
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runMultiplier: number
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gravity: number
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jumpSpeed: number
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eyeHeight: number
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}
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export namespace CharacterController {
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export function update(
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character: Character,
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input: CharacterInput,
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dt: number,
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world: World,
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config: CharacterConfig,
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): void {
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if (input.jump && character.onGround) {
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character.velocityY = config.jumpSpeed
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character.onGround = false
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}
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const steps = moveSubsteps(input, dt, config)
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for (let i = 0; i < steps; i++) {
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moveHorizontal(character, input, dt / steps, config)
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CollisionWorld.pushOut(world, character.position, config.radius)
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}
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character.velocityY -= config.gravity * dt
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character.position.y += character.velocityY * dt
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const ground = CollisionWorld.groundHeight(world, character.position)
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if (character.position.y <= ground) {
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character.position.y = ground
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character.velocityY = 0
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character.onGround = true
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} else {
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character.onGround = false
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}
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}
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function moveSubsteps(
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input: CharacterInput,
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dt: number,
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config: CharacterConfig,
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): number {
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const distance =
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config.speed *
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runFactor(input, config) *
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dt *
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Math.hypot(input.forward, input.right)
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return Math.max(1, Math.ceil(distance / config.radius))
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}
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function moveHorizontal(
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character: Character,
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input: CharacterInput,
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dt: number,
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config: CharacterConfig,
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): void {
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const speed = config.speed * runFactor(input, config) * dt
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const forwardX = Math.sin(character.yaw)
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const forwardZ = -Math.cos(character.yaw)
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const rightX = Math.cos(character.yaw)
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const rightZ = Math.sin(character.yaw)
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character.position.x +=
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(forwardX * input.forward + rightX * input.right) * speed
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character.position.z +=
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(forwardZ * input.forward + rightZ * input.right) * speed
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}
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function runFactor(input: CharacterInput, config: CharacterConfig): number {
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return input.run ? config.runMultiplier : 1
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}
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}
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