playcanvas
Version:
Open-source WebGL/WebGPU 3D engine for the web
63 lines (62 loc) • 2.84 kB
JavaScript
import { math } from "../../../core/math/math.js";
import { AnimBlendTree } from "./anim-blend-tree.js";
class AnimBlendTree1D extends AnimBlendTree {
/**
* Create a new BlendTree1D instance.
*
* @param {AnimState} state - The AnimState that this AnimBlendTree belongs to.
* @param {AnimBlendTree|null} parent - The parent of the AnimBlendTree. If not null, the
* AnimNode is stored as part of a {@link AnimBlendTree} hierarchy.
* @param {string} name - The name of the BlendTree. Used when assigning an {@link AnimTrack}
* to its children.
* @param {number|Vec2} point - The coordinate/vector that's used to determine the weight of
* this node when it's part of an {@link AnimBlendTree}.
* @param {string[]} parameters - The anim component parameters which are used to calculate the
* current weights of the blend trees children.
* @param {object[]} children - The child nodes that this blend tree should create. Can either
* be of type {@link AnimNode} or {@link AnimBlendTree}.
* @param {boolean} syncAnimations - If true, the speed of each blended animation will be
* synchronized.
* @param {Function} createTree - Used to create child blend trees of varying types.
* @param {Function} findParameter - Used at runtime to get the current parameter values.
*/
constructor(state, parent, name, point, parameters, children, syncAnimations, createTree, findParameter) {
children.sort((a, b) => a.point - b.point);
super(state, parent, name, point, parameters, children, syncAnimations, createTree, findParameter);
}
calculateWeights() {
if (this.updateParameterValues()) return;
let weightedDurationSum = 0;
this._children[0].weight = 0;
for (let i = 0; i < this._children.length; i++) {
const c1 = this._children[i];
if (i !== this._children.length - 1) {
const c2 = this._children[i + 1];
if (c1.point === c2.point) {
c1.weight = 0.5;
c2.weight = 0.5;
} else if (math.between(this._parameterValues[0], c1.point, c2.point, true)) {
const child2Distance = Math.abs(c1.point - c2.point);
const parameterDistance = Math.abs(c1.point - this._parameterValues[0]);
const weight = (child2Distance - parameterDistance) / child2Distance;
c1.weight = weight;
c2.weight = 1 - weight;
} else {
c2.weight = 0;
}
}
if (this._syncAnimations) {
weightedDurationSum += c1.animTrack.duration / c1.absoluteSpeed * c1.weight;
}
}
if (this._syncAnimations) {
for (let i = 0; i < this._children.length; i++) {
const child = this._children[i];
child.weightedSpeed = child.animTrack.duration / child.absoluteSpeed / weightedDurationSum;
}
}
}
}
export {
AnimBlendTree1D
};