AtomicGameEngine-Examples/PhysicsPlatformer/Resources/Components/Bat.js

var glmatrix = require("gl-matrix");
var vec2 = glmatrix.vec2;

var game = Atomic.game;
var node = self.node;

var animationSet = game.cache.getResource("AnimationSet2D", "Sprites/Bat/Bat.scml");
var sprite = node.createComponent("AnimatedSprite2D");
sprite.setAnimation(animationSet, "Fly");
sprite.setLayer(100);
node.scale2D = [.5, .5];

var cwaypoint = -1;

var light = null;

function start() {

    if (!Platformer.daytime) {

        light = node.createComponent("PointLight2D");
        light.color = [1, 1, 1, 1];
        light.radius = 4;

        Platformer.lightGroup.addLight(light);

        node.createJSComponent("LightFlicker");
    }
}

var time = Math.random() * 10000;

function update(timestep) {

    time += timestep * 4;
    
    if (light)
        light.color = [.5 + Math.sin(time), .5 + Math.cos(time), .5 + Math.cos(-time), 1];

    var waypoints = Platformer.batWaypoints;
    var pos = node.position2D;

    if (cwaypoint == -1 || vec2.distance(pos, waypoints[cwaypoint]) < .5) {
        cwaypoint = Math.round(Math.random() * (waypoints.length - 1));
        return;
    }

    var dir = vec2.create();
    var goal = waypoints[cwaypoint];

    vec2.subtract(dir, goal, pos);
    vec2.normalize(dir, dir);
    vec2.scale(dir, dir, timestep * 2);

    if (dir[0] < 0)
        sprite.flipX = true;
    else
        sprite.flipX = false;

    vec2.add(pos, pos, dir);
    node.position2D = pos;


}