p2s/src/collision/NaiveBroadphase.js

A JavaScript 2D physics engine.

var Broadphase = require('../collision/Broadphase');

module.exports = NaiveBroadphase;

/**
 * Naive broadphase implementation. Does N^2 tests.
 *
 * @class NaiveBroadphase
 * @constructor
 * @extends Broadphase
 */
function NaiveBroadphase(){
    Broadphase.call(this, Broadphase.NAIVE);
}
NaiveBroadphase.prototype = new Broadphase();
NaiveBroadphase.prototype.constructor = NaiveBroadphase;

/**
 * Get the colliding pairs
 * @method getCollisionPairs
 * @param  {World} world
 * @return {Array}
 */
NaiveBroadphase.prototype.getCollisionPairs = function(world){
    var bodies = world.bodies,
        result = this.result;

    result.length = 0;

    for(var i=0, Ncolliding=bodies.length; i!==Ncolliding; i++){
        var bi = bodies[i];

        for(var j=0; j<i; j++){
            var bj = bodies[j];

            if(Broadphase.canCollide(bi,bj) && this.boundingVolumeCheck(bi,bj)){
                result.push(bi,bj);
            }
        }
    }

    return result;
};

/**
 * Returns all the bodies within an AABB.
 * @method aabbQuery
 * @param  {World} world
 * @param  {AABB} aabb
 * @param {array} result An array to store resulting bodies in.
 * @return {array}
 */
NaiveBroadphase.prototype.aabbQuery = function(world, aabb, result){
    result = result || [];

    var bodies = world.bodies;
    for(var i = 0; i < bodies.length; i++){
        var b = bodies[i];

        if(b.aabbNeedsUpdate){
            b.updateAABB();
        }

        if(b.aabb.overlaps(aabb)){
            result.push(b);
        }
    }

    return result;
};