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

   1 import { System } from '@serpentity/serpentity';
   2
   3 import PhysicalWithAttributesNode from '../nodes/physical_with_attributes';
   4 import Config from '../config';
   5
   6 /**
   7  * Distribuets physics data to the related components
   8  *
   9  * @extends {external:Serpentity.System}
  10  * @class PhysicsToAttributesSystem
  11  * @param {object} config a configuration object to extend.
  12  */
  13 export default class PhysicsToAttributesSystem extends System {
  14
  15   constructor(config = {}) {
  16
  17     super();
  18
  19     /**
  20      * The node collection of physics entities
  21      *
  22      * @property {external:Serpentity.NodeCollection} physicalEntities
  23      * @instance
  24      * @memberof PhysicsToAttributesSystem
  25      */
  26     this.physicalEntities = null;
  27   }
  28
  29   /**
  30    * Initializes system when added. Requests physics nodes
  31    *
  32    * @function added
  33    * @memberof PhysicsToAttributesSystem
  34    * @instance
  35    * @param {external:Serpentity.Engine} engine the serpentity engine to
  36    * which we are getting added
  37    */
  38   added(engine) {
  39
  40     this.physicalEntities = engine.getNodes(PhysicalWithAttributesNode);
  41   }
  42
  43   /**
  44    * Clears system resources when removed.
  45    *
  46    * @function removed
  47    * @instance
  48    * @memberof PhysicsToAttributesSystem
  49    */
  50   removed() {
  51
  52     this.physicalEntities = null;
  53   }
  54
  55   /**
  56    * Runs on every update of the loop. Updates the other components
  57    * based on physics
  58    *
  59    * @function update
  60    * @instance
  61    * @param {Number} currentFrameDuration the duration of the current
  62    * frame
  63    * @memberof PhysicsToAttributesSystem
  64    */
  65   update(currentFrameDuration) {
  66
  67     for (const physicalEntity of this.physicalEntities) {
  68       physicalEntity.position.x = physicalEntity.body.body.position.x * Config.meterSize;
  69       physicalEntity.position.y = physicalEntity.body.body.position.y * Config.meterSize;
  70       physicalEntity.angle.angle = physicalEntity.body.body.angle;
  71     }
  72   }
  73 };