@dcl-sdk/utils
Version:
A collection of helpers to make it easier to build a Decentraland scene using the SDK 7.
126 lines • 22.1 kB
JavaScript
import { engine, EntityState, Schemas, Transform } from '@dcl/sdk/ecs';
import { Scalar, Vector3, Quaternion } from '@dcl/sdk/math';
import { createCatmullRomSpline } from './math';
import { priority } from './priority';
function createPaths(targetEngine) {
const FollowPath = targetEngine.defineComponent('dcl.utils.FollowPath', {
points: Schemas.Array(Schemas.Vector3),
faceDirection: Schemas.Boolean,
speed: Schemas.Number,
normalizedTime: Schemas.Number,
currentIndex: Schemas.Number,
segmentTimes: Schemas.Array(Schemas.Number),
curveSegmentCount: Schemas.Number
});
const finishCbs = new Map();
const pointReachedCbs = new Map();
function unregisterEntity(entity) {
finishCbs.delete(entity);
pointReachedCbs.delete(entity);
FollowPath.deleteFrom(entity);
}
function system(dt) {
const deadPaths = [];
const pointReachedPaths = [];
for (const entity of finishCbs.keys()) {
if (targetEngine.getEntityState(entity) == EntityState.Removed || !FollowPath.has(entity)) {
unregisterEntity(entity);
continue;
}
const transform = Transform.getMutable(entity);
const path = FollowPath.getMutable(entity);
path.normalizedTime = Scalar.clamp(path.normalizedTime + dt * path.speed, 0, 1);
if (path.normalizedTime >= 1)
deadPaths.push(entity);
while (path.normalizedTime >= path.segmentTimes[path.currentIndex] &&
path.currentIndex < path.points.length - 1) {
if (path.faceDirection) {
const direction = Vector3.subtract(path.points[path.currentIndex + 1], path.points[path.currentIndex]);
transform.rotation = Quaternion.lookRotation(direction);
}
if (path.currentIndex > 0 && path.currentIndex % path.curveSegmentCount == 0) {
const pointIndex = path.currentIndex / path.curveSegmentCount;
const pointCoords = path.points[path.currentIndex];
const nextPointCoords = path.points[path.currentIndex + path.curveSegmentCount];
pointReachedPaths.push({ entity: entity, index: pointIndex, coords: pointCoords, nextCoords: nextPointCoords });
}
path.currentIndex += 1;
}
const timeDiff = path.segmentTimes[path.currentIndex] - path.segmentTimes[path.currentIndex - 1];
const coef = (path.segmentTimes[path.currentIndex] - path.normalizedTime) / timeDiff;
transform.position = Vector3.lerp(path.points[path.currentIndex], path.points[path.currentIndex - 1], coef);
}
for (const pointReached of pointReachedPaths) {
const callback = pointReachedCbs.get(pointReached.entity);
if (callback) {
callback(pointReached.index, pointReached.coords, pointReached.nextCoords);
}
}
for (const entity of deadPaths) {
const callback = finishCbs.get(entity);
unregisterEntity(entity);
if (callback)
callback();
}
}
targetEngine.addSystem(system, priority.PathSystemPriority);
function startPath(entity, points, duration, faceDirection, curveSegmentCount, onFinishCallback, onPointReachedCallback) {
if (points.length < 2)
throw new Error('At least 2 points are required to form a path.');
if (duration == 0)
throw new Error('Path duration must not be zero');
if (curveSegmentCount) {
const loop = Vector3.equals(points[0], points[points.length - 1]);
if (loop) {
points.pop();
points.unshift(points.pop());
}
points = createCatmullRomSpline(points, curveSegmentCount, loop);
}
else {
curveSegmentCount = 1;
}
finishCbs.set(entity, onFinishCallback);
pointReachedCbs.set(entity, onPointReachedCallback);
let totalLength = 0;
const segmentLengths = [];
for (let i = 0; i < points.length - 1; i++) {
let sqDist = Vector3.distance(points[i], points[i + 1]);
totalLength += sqDist;
segmentLengths.push(sqDist);
}
const segmentTimes = [0];
for (let i = 0; i < segmentLengths.length; i++) {
segmentTimes.push(segmentLengths[i] / totalLength + segmentTimes[i]);
}
FollowPath.createOrReplace(entity, {
points: points,
segmentTimes: segmentTimes,
curveSegmentCount: curveSegmentCount,
speed: 1 / duration,
normalizedTime: 0,
currentIndex: 0,
faceDirection: faceDirection
});
}
return {
startStraightPath(entity, points, duration, faceDirection, onFinishCallback, onPointReachedCallback) {
return startPath(entity, points, duration, faceDirection, 0, onFinishCallback, onPointReachedCallback);
},
startSmoothPath(entity, points, duration, segmentCount, faceDirection, onFinishCallback, onPointReachedCallback) {
if (segmentCount < 2 || !Number.isInteger(segmentCount))
throw new Error(`segmentCount must be an integer that is greater than 2, got: ${segmentCount}`);
return startPath(entity, points, duration, faceDirection, segmentCount, onFinishCallback, onPointReachedCallback);
},
stopPath(entity) {
unregisterEntity(entity);
},
getOnFinishCallback(entity) {
if (!finishCbs.has(entity))
throw new Error(`Entity ${entity} is not registered in triggers system`);
return finishCbs.get(entity);
}
};
}
export const paths = createPaths(engine);
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{ engine, Entity, EntityState, IEngine, Schemas, Transform } from '@dcl/sdk/ecs'\nimport { Scalar, Vector3, Quaternion } from '@dcl/sdk/math'\nimport { createCatmullRomSpline } from './math'\nimport { priority } from './priority'\n\nexport type Paths = ReturnType<typeof createPaths>\n\nexport type OnFinishCallback = () => void\nexport type OnPointReachedCallback = (pointIndex: number, point: Vector3, nextPoint: Vector3) => void\n\nfunction createPaths(targetEngine: IEngine) {\n  const FollowPath = targetEngine.defineComponent('dcl.utils.FollowPath', {\n    points: Schemas.Array(Schemas.Vector3),\n    faceDirection: Schemas.Boolean,\n    speed: Schemas.Number,\n    normalizedTime: Schemas.Number,\n    currentIndex: Schemas.Number,\n    segmentTimes: Schemas.Array(Schemas.Number),\n    curveSegmentCount: Schemas.Number\n  })\n\n  type FinishCallbackMap = Map<Entity, OnFinishCallback | undefined>\n  type OnPointReachedCallbackMap = Map<Entity, OnPointReachedCallback | undefined>\n\n  const finishCbs: FinishCallbackMap = new Map()\n  const pointReachedCbs: OnPointReachedCallbackMap = new Map()\n\n  function unregisterEntity(entity: Entity) {\n    finishCbs.delete(entity)\n    pointReachedCbs.delete(entity)\n    FollowPath.deleteFrom(entity)\n  }\n\n  function system(dt: number) {\n    const deadPaths = []\n    const pointReachedPaths = []\n\n    for (const entity of finishCbs.keys()) {\n      if (targetEngine.getEntityState(entity) == EntityState.Removed || !FollowPath.has(entity)) {\n        unregisterEntity(entity)\n        continue\n      }\n\n      const transform = Transform.getMutable(entity)\n      const path = FollowPath.getMutable(entity)\n      path.normalizedTime = Scalar.clamp(path.normalizedTime + dt * path.speed, 0, 1)\n      if (path.normalizedTime >= 1)\n        deadPaths.push(entity)\n\n      while (\n        path.normalizedTime >= path.segmentTimes[path.currentIndex] &&\n        path.currentIndex < path.points.length - 1\n      ) {\n        if (path.faceDirection) {\n          const direction = Vector3.subtract(path.points[path.currentIndex + 1], path.points[path.currentIndex])\n          transform.rotation = Quaternion.lookRotation(direction)\n        }\n        if (path.currentIndex > 0 && path.currentIndex % path.curveSegmentCount == 0) {\n          const pointIndex = path.currentIndex / path.curveSegmentCount\n          const pointCoords = path.points[path.currentIndex]\n          const nextPointCoords = path.points[path.currentIndex + path.curveSegmentCount]\n          pointReachedPaths.push({entity: entity, index: pointIndex, coords: pointCoords, nextCoords: nextPointCoords})\n        }\n        path.currentIndex += 1\n      }\n\n      const timeDiff = path.segmentTimes[path.currentIndex] - path.segmentTimes[path.currentIndex - 1]\n      const coef = (path.segmentTimes[path.currentIndex] - path.normalizedTime) / timeDiff\n      transform.position = Vector3.lerp(path.points[path.currentIndex], path.points[path.currentIndex - 1], coef)\n    }\n\n    for (const pointReached of pointReachedPaths) {\n      const callback = pointReachedCbs.get(pointReached.entity)\n      if (callback) {\n        callback(pointReached.index, pointReached.coords, pointReached.nextCoords)\n      }\n    }\n\n    for (const entity of deadPaths) {\n      const callback = finishCbs.get(entity)\n      unregisterEntity(entity)\n      if (callback)\n        callback()\n    }\n  }\n\n  targetEngine.addSystem(system, priority.PathSystemPriority)\n\n  function startPath(\n    entity: Entity,\n    points: Vector3[],\n    duration: number,\n    faceDirection?: boolean,\n    curveSegmentCount?: number,\n    onFinishCallback?: OnFinishCallback,\n    onPointReachedCallback?: OnPointReachedCallback\n  ) {\n    if (points.length < 2)\n      throw new Error('At least 2 points are required to form a path.')\n\n    if (duration == 0)\n      throw new Error('Path duration must not be zero')\n\n    if (curveSegmentCount) {\n      const loop = Vector3.equals(points[0], points[points.length - 1])\n      if (loop) {\n        points.pop()\n        points.unshift(points.pop()!)\n      }\n      points = createCatmullRomSpline(points, curveSegmentCount, loop)\n    } else {\n      curveSegmentCount = 1\n    }\n\n    finishCbs.set(entity, onFinishCallback)\n    pointReachedCbs.set(entity, onPointReachedCallback)\n\n    let totalLength = 0\n    const segmentLengths = []\n    for (let i = 0; i < points.length - 1; i++) {\n      let sqDist = Vector3.distance(points[i], points[i + 1])\n      totalLength += sqDist\n      segmentLengths.push(sqDist)\n    }\n\n    const segmentTimes = [0]\n    for (let i = 0; i < segmentLengths.length; i++) {\n      segmentTimes.push(segmentLengths[i] / totalLength + segmentTimes[i])\n    }\n\n    FollowPath.createOrReplace(entity, {\n      points: points,\n      segmentTimes: segmentTimes,\n      curveSegmentCount: curveSegmentCount,\n      speed: 1 / duration,\n      normalizedTime: 0,\n      currentIndex: 0,\n      faceDirection: faceDirection\n    })\n  }\n\n  return {\n    startStraightPath(\n      entity: Entity,\n      points: Vector3[],\n      duration: number,\n      faceDirection?: boolean,\n      onFinishCallback?: OnFinishCallback,\n      onPointReachedCallback?: OnPointReachedCallback\n    ) {\n      return startPath(entity, points, duration, faceDirection, 0, onFinishCallback, onPointReachedCallback)\n    },\n    startSmoothPath(\n      entity: Entity,\n      points: Vector3[],\n      duration: number,\n      segmentCount: number,\n      faceDirection?: boolean,\n      onFinishCallback?: OnFinishCallback,\n      onPointReachedCallback?: OnPointReachedCallback\n    ) {\n      if (segmentCount < 2 || !Number.isInteger(segmentCount))\n        throw new Error(`segmentCount must be an integer that is greater than 2, got: ${segmentCount}`)\n      return startPath(entity, points, duration, faceDirection, segmentCount, onFinishCallback, onPointReachedCallback)\n    },\n    stopPath(entity: Entity) {\n      unregisterEntity(entity)\n    },\n    getOnFinishCallback(entity: Entity) {\n      if (!finishCbs.has(entity))\n        throw new Error(`Entity ${entity} is not registered in triggers system`)\n      return finishCbs.get(entity)\n    }\n  }\n}\n\nexport const paths = createPaths(engine)\n"]}