git.r.bdr.sh - rbdr/sumo/blob - lib/systems/detect_points_collision.js

   1 import { System } from '@serpentity/serpentity';
   2 import { SAT } from 'matter-js';
   3
   4 import BodyComponent from '../components/body';
   5 import PointsColliderNode from '../nodes/points_collider';
   6 import PointsNode from '../nodes/points';
   7
   8 /**
   9  * Handles grabbing between entities
  10  *
  11  * @extends {external:Serpentity.System}
  12  * @class DetectPointsCollisionSystem
  13  * @param {object} config a configuration object to extend.
  14  */
  15 export default class DetectPointsCollisionSystem extends System {
  16
  17   constructor(config = {}) {
  18
  19     super();
  20
  21     /**
  22      * The collection of points colliders
  23      *
  24      * @property {external:Serpentity.NodeCollection} pointsColliders
  25      * @instance
  26      * @memberof DetectPointsCollisionSystem
  27      */
  28     this.pointsColliders = null;
  29
  30     /**
  31      * The collection of points keepers
  32      *
  33      * @property {external:Serpentity.NodeCollection} pointsKeepers
  34      * @instance
  35      * @memberof DetectPointsCollisionSystem
  36      */
  37     this.pointsKeepers = null;
  38   }
  39
  40   /**
  41    * Initializes system when added. Requests points colliders and points
  42    * accumulators
  43    *
  44    * @function added
  45    * @memberof DetectPointsCollisionSystem
  46    * @instance
  47    * @param {external:Serpentity.Engine} engine the serpentity engine to
  48    * which we are getting added
  49    */
  50   added(engine) {
  51
  52     this.pointsCollider = engine.getNodes(PointsColliderNode);
  53     this.pointsKeepers = engine.getNodes(PointsNode);
  54   }
  55
  56   /**
  57    * Clears system resources when removed.
  58    *
  59    * @function removed
  60    * @instance
  61    * @memberof DetectPointsCollisionSystem
  62    */
  63   removed() {
  64
  65     this.pointsCollider = null;
  66     this.pointsKeepers = null;
  67   }
  68
  69   /**
  70    * Runs on every update of the loop. Triggers grab and manages cooldown
  71    *
  72    * @function update
  73    * @instance
  74    * @param {Number} currentFrameDuration the duration of the current
  75    * frame
  76    * @memberof DetectPointsCollisionSystem
  77    */
  78   update(currentFrameDuration) {
  79
  80     const points = {};
  81
  82     for (const collider of this.pointsCollider) {
  83       const collisionTargetBody = collider.pointsCollider.collisionTarget.getComponent(BodyComponent);
  84       const pointsTarget = collider.pointsCollider.pointsTarget;
  85
  86       if (collisionTargetBody) {
  87         const collision = SAT.collides(collider.body.body, collisionTargetBody.body);
  88         if (collision.collided) {
  89           points[pointsTarget] = (points[pointsTarget] || 0) + 1;
  90         }
  91       }
  92     }
  93
  94     for (const pointsKeeper of this.pointsKeepers) {
  95       for (const pointsLabel of Object.keys(points)) {
  96         pointsKeeper.points[pointsLabel] = (pointsKeeper.points[pointsLabel] || 0) + points[pointsLabel];
  97       }
  98     }
  99   }
 100 }