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import { ENTITY_EVENTS } from '../constants';
import { ANIMATION_NOT_FOUND } from '../../lib/messages';
const DEFAULT_BLEND_DURATION = 0.3;
export default class AnimationHandler extends EventDispatcher {
constructor(mesh, animations = []) {
super();
this.mixer = new AnimationMixer(mesh);
this.animations = animations;
this.isPlaying = false;
this.currentAction = null;
this.activeActions = new Map(); // Track multiple active actions for layered blending
this.addEventsListeners();
}
addEventsListeners() {
this.mixer.addEventListener('loop', this.getAnimationEventHandler(ENTITY_EVENTS.ANIMATION.LOOP));
this.mixer.addEventListener('finished', this.getAnimationEventHandler(ENTITY_EVENTS.ANIMATION.FINISHED));
}
getAnimationEventHandler = (type) => ({ action, direction }) => {
this.dispatchEvent({
type,
action,
direction
})
}
getAction(id) {
let action;
if (typeof id === 'number') {
action = this.animations[id];
} else if (typeof id === 'string') {
action = AnimationClip.findByName(this.animations, id);
}
return action;
}
getAvailableAnimations() {
return this.animations.map(({ name }) => name);
}
stopAll() {
this.mixer.stopAllAction();
this.isPlaying = false;
}
stopCurrentAnimation() {
if (this.currentAction) {
this.currentAction.stop();
}
this.isPlaying = false;
}
/**
* Stop a specific animation by name/index with optional fade out
* @param {string|number} id - Animation name or index
* @param {number} fadeOutDuration - Duration to fade out (0 for immediate stop)
*/
stopAnimation(id, fadeOutDuration = 0) {
const clip = this.getAction(id);
if (!clip) return;
const action = this.mixer.clipAction(clip);
Iif (fadeOutDuration > 0) {
action.fadeOut(fadeOutDuration);
} else {
action.stop();
}
this.activeActions.delete(id);
if (this.currentAction === action) {
this.currentAction = null;
this.isPlaying = false;
}
}
/**
* Play an animation with optional blending from current animation
* @param {string|number} id - Animation name or index
* @param {Object} options - Playback options
* @param {number} options.loop - Loop mode (LoopRepeat, LoopOnce, etc.)
* @param {number} options.blendDuration - Duration to blend from previous animation
* @param {number} options.timeScale - Playback speed (1 = normal, 2 = double speed)
* @param {number} options.weight - Animation weight for layered blending (0-1)
* @param {boolean} options.clampWhenFinished - Keep last frame when finished (for LoopOnce)
*/
playAnimation(id, options = {}) {
const clip = this.getAction(id);
if (!clip) {
console.warn(ANIMATION_NOT_FOUND);
return null;
}
const {
loop = LoopRepeat,
blendDuration = DEFAULT_BLEND_DURATION,
timeScale = 1,
weight = 1,
clampWhenFinished = true
} = options;
this.isPlaying = true;
if (this.currentAction) {
return this.crossFadeTo(id, { ...options, blendDuration });
} else {
const action = this.mixer.clipAction(clip);
this.currentAction = action;
this.activeActions.set(id, action);
action
.reset()
.setLoop(loop)
.setEffectiveTimeScale(timeScale)
.setEffectiveWeight(weight);
Iif (loop === LoopOnce) {
action.clampWhenFinished = clampWhenFinished;
}
action.play();
return action;
}
}
/**
* Crossfade from current animation to a new animation
* @param {string|number} id - Target animation name or index
* @param {Object} options - Blend options
* @param {number} options.blendDuration - Duration of the crossfade
* @param {number} options.loop - Loop mode for the new animation
* @param {number} options.timeScale - Playback speed
* @param {boolean} options.warp - Whether to warp time scales during blend
*/
crossFadeTo(id, options = {}) {
const clip = this.getAction(id);
if (!clip) {
console.warn(ANIMATION_NOT_FOUND);
return null;
}
const {
blendDuration = DEFAULT_BLEND_DURATION,
loop = LoopRepeat,
timeScale = 1,
warp = false,
clampWhenFinished = true
} = options;
const previousAction = this.currentAction;
const newAction = this.mixer.clipAction(clip);
Iif (previousAction === newAction) {
return newAction; // Already playing this animation
}
this.currentAction = newAction;
this.activeActions.set(id, newAction);
newAction
.reset()
.setLoop(loop)
.setEffectiveTimeScale(timeScale)
.setEffectiveWeight(1);
Iif (loop === LoopOnce) {
newAction.clampWhenFinished = clampWhenFinished;
}
newAction.play();
if (previousAction) {
Iif (warp) {
// Synchronize time scales during crossfade
previousAction.crossFadeTo(newAction, blendDuration, true);
} else {
// Standard crossfade
previousAction.fadeOut(blendDuration);
newAction.fadeIn(blendDuration);
}
}
return newAction;
}
/**
* Legacy method - kept for backwards compatibility
*/
fadeToAnimation(action, { duration = DEFAULT_BLEND_DURATION, loop = LoopRepeat } = {}) {
const previousAction = this.currentAction;
this.currentAction = this.mixer.clipAction(action);
if (previousAction && previousAction !== this.currentAction) {
previousAction.fadeOut(duration);
}
this.currentAction
.reset()
.setEffectiveTimeScale(1)
.setEffectiveWeight(1)
.fadeIn(duration)
.setLoop(loop)
.play();
}
/**
* Set the weight of an animation for layered blending
* @param {string|number} id - Animation name or index
* @param {number} weight - Weight value (0-1)
* @param {number} fadeDuration - Optional fade duration to reach target weight
*/
setAnimationWeight(id, weight, fadeDuration = 0) {
const clip = this.getAction(id);
Eif (!clip) return;
const action = this.mixer.clipAction(clip);
if (fadeDuration > 0) {
// Gradually change weight
const startWeight = action.getEffectiveWeight();
const startTime = this.mixer.time;
const updateWeight = () => {
const elapsed = this.mixer.time - startTime;
const t = Math.min(elapsed / fadeDuration, 1);
action.setEffectiveWeight(startWeight + (weight - startWeight) * t);
};
// This will be called in the update loop
action._weightUpdateFn = updateWeight;
} else {
action.setEffectiveWeight(weight);
}
}
/**
* Set the time scale (speed) of an animation
* @param {string|number} id - Animation name or index
* @param {number} timeScale - Speed multiplier (1 = normal)
*/
setAnimationTimeScale(id, timeScale) {
const clip = this.getAction(id);
Eif (!clip) return;
const action = this.mixer.clipAction(clip);
action.setEffectiveTimeScale(timeScale);
}
/**
* Get the current time of an animation
* @param {string|number} id - Animation name or index
* @returns {number} Current time in seconds
*/
getAnimationTime(id) {
const clip = this.getAction(id);
if (!clip) return 0;
const action = this.mixer.clipAction(clip);
return action.time;
}
/**
* Set the current time of an animation
* @param {string|number} id - Animation name or index
* @param {number} time - Time in seconds
*/
setAnimationTime(id, time) {
const clip = this.getAction(id);
if (!clip) return;
const action = this.mixer.clipAction(clip);
action.time = time;
}
/**
* Check if a specific animation is currently playing
* @param {string|number} id - Animation name or index
* @returns {boolean}
*/
isAnimationPlaying(id) {
const clip = this.getAction(id);
if (!clip) return false;
const action = this.mixer.clipAction(clip);
return action.isRunning();
}
/**
* Get the duration of an animation clip
* @param {string|number} id - Animation name or index
* @returns {number} Duration in seconds
*/
getAnimationDuration(id) {
const clip = this.getAction(id);
return clip ? clip.duration : 0;
}
update(dt) {
this.mixer.update(dt);
}
} |