evilsatellites/EvilSatellites/Radar.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using SynthySound;
using EvilSatellites.Screens;
using EvilSatellites.Objects;
using Microsoft.Xna.Framework;

namespace EvilSatellites
{
    public class Radar
    {
        public bool Active { get; set; }
        public IGameObject Owner;
        public IGameObject Target;
        public IScreen Screen;
        public ISoundEffect RadarNoise;
        public ObjectType Filter;
        public Radar(IGameObject owner, IScreen screen)
        {
            Owner = owner;
            Screen = screen;
            RadarNoise = Screen.Manager.Sound.Load(@"sfx/ui/radar/pingEnemy.wav", false);
            RadarNoise.Loop = true;
            Filter = ObjectType.Satellite;
            Active = false;
        }

        public void SetObjectType(ObjectType type)
        {
            Filter = type;
        }

        public void Start()
        {
            RadarNoise.Reset();
            RadarNoise.Play();
            Active = true;
        }

        public void Stop()
        {
            RadarNoise.Pause();
            Active = false;
        }

        public void Update(List<IGameObject> objects)
        {
            if (objects.Count < 1) return;
            float minDistance = 50000000;
            Target = null;
            foreach (var obj in objects)
            {
                if (obj.Type != Filter) continue;
                float distance = Vector3.Distance(obj.Position, Owner.Position);
                if (distance < minDistance)
                {
                    minDistance = distance;
                    Target = obj;
                }
            }
            if (Target == null)
            {
                RadarNoise.Pitch = 0.1;
                return;
            }
            Vector3 radarTarget = (Target.Position - Owner.Position);
            radarTarget.Normalize();
            RadarNoise.Pitch = MathHelper.Clamp(0.1f / Vector3.Distance(Owner.Rotation.Forward, radarTarget) * 3f, 0, 1);
        }
    }
}