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import { System } from '@serpentity/serpentity';
import { Engine, World } from 'matter-js';
import PhysicalNode from '../nodes/physical';
import GrabAreaNode from '../nodes/grab_area';
const internals = {
kNoEngine: 'No matter js physics engine found. Make sure you set the `engine` key in the config object when initializing.'
};
/**
* Adds and removes objects to the physics world and calls update
*
* @extends {external:Serpentity.System}
* @class PhysicsWorldControlSystem
* @param {object} config a configuration object to extend.
*/
export default class PhysicsWorldControlSystem extends System {
constructor(config = {}) {
super();
/**
* The node collection of physics entities
*
* @property {external:Serpentity.NodeCollection} physicalEntities
* @instance
* @memberof PhysicsWorldControlSystem
*/
this.physicalEntities = null;
/**
* The matter-js engine we will use to process physics
*
* @property {external:MatterJs.Engine} engine
* @instance
* @memberof PhysicsWorldControlSystem
*/
this.engine = config.engine;
if (!this.engine) {
throw new Error(internals.kNoEngine);
}
}
/**
* Initializes system when added. Requests physics nodes and
* attaches to event listeners to add / remove them to pixi stage
*
* @function added
* @memberof PhysicsWorldControlSystem
* @instance
* @param {external:Serpentity.Engine} engine the serpentity engine to
* which we are getting added
*/
added(engine) {
this.physicalEntities = engine.getNodes(PhysicalNode);
this.grabAreaEntities = engine.getNodes(GrabAreaNode);
this.physicalEntities.on('nodeAdded', (event) => {
World.add(this.engine.world, [event.node.body.body]);
});
this.physicalEntities.on('nodeRemoved', (event) => {
World.remove(this.engine.world, [event.node.body.body]);
});
this.grabAreaEntities.on('nodeAdded', (event) => {
World.add(this.engine.world, [event.node.grabArea.area]);
});
this.grabAreaEntities.on('nodeRemoved', (event) => {
World.remove(this.engine.world, [event.node.grabArea.area]);
});
}
/**
* Clears system resources when removed.
*
* @function removed
* @instance
* @memberof PhysicsWorldControlSystem
*/
removed() {
this.physicalEntities.removeAllListeners('nodeAdded');
this.physicalEntities.removeAllListeners('nodeRemoved');
this.physicalEntities = null;
this.grabAreaEntities.removeAllListeners('nodeAdded');
this.grabAreaEntities.removeAllListeners('nodeRemoved');
this.grabAreaEntities = null;
}
/**
* Runs on every update of the loop. Updates the physics
*
* @function update
* @instance
* @param {Number} currentFrameDuration the duration of the current
* frame
* @memberof PhysicsWorldControlSystem
*/
update(currentFrameDuration) {
Engine.update(this.engine, currentFrameDuration);
}
}
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