public Vehicle CreateChassis(Vector2 colliderCenter, float colliderRadius, int massDensity, Vector3 exhaustPosition,
ParticleEffect2D exhaustParticles, Sound engineSound, Sound tireSound, Sound[] suspensionSounds,
int horsePower, int maxSpeedFwd, int maxSpeedBwd, int rollForce)
{
// We set out private fields
_horsePower = horsePower;
_maxSpdFwd = maxSpeedFwd;
_maxSpdBwd = maxSpeedBwd;
_rollForce = rollForce;
_rigidBody = GetComponent <RigidBody2D>();
// We add the collider (circle collider at the moment)
var col = Racer2D.AddCollider <CollisionCircle2D>(Node, dens: massDensity, fric: 0);
col.SetRadius(colliderRadius);
col.SetCenter(colliderCenter);
// We create the exhaust particle system
var exhaustParticlesNode = Node.CreateChild();
exhaustParticlesNode.SetPosition(exhaustPosition);
_exhaustParticles = exhaustParticlesNode.CreateComponent <ParticleEmitter2D>();
_exhaustParticles.SetEffect(exhaustParticles);
// We setup the engine sound and other sound effect
engineSound.SetLooped(true);
_soundSource = Node.CreateComponent <SoundSource3D>();
_soundSource.SetNearDistance(10);
_soundSource.SetFarDistance(50);
_accelSound = engineSound;
_brakeSound = tireSound;
_suspensionSoundSource = Node.CreateComponent <SoundSource3D>();
_suspensionSounds = suspensionSounds;
// We return the Vehicle for convenience, since this function is intended to be the vehicle's init function
return(this);
}
public Node CreateWheel(Sprite2D sprite, Vector2 relativePosition, float radius, int suspensionFrequency, float suspensionDamping,
ParticleEffect2D particles, float distanceToEmitParticles)
{
Node wheelNode = Racer2D.CreateSpriteNode(sprite);
wheelNode.SetPosition2D(relativePosition);
// CreateSpriteNode adds a RigidBody for us, so we get it here
RigidBody2D wheelRigidBody = wheelNode.GetComponent <RigidBody2D>();
// We activate CCD
wheelRigidBody.SetBullet(true);
Racer2D.AddCollider <CollisionCircle2D>(wheelNode).SetRadius(radius);
// The Box2D wheel joint provides spring for simulating suspension
ConstraintWheel2D wheelJoint = Node.CreateComponent <ConstraintWheel2D>();
wheelJoint.SetOtherBody(wheelRigidBody);
wheelJoint.SetAnchor(relativePosition);
wheelJoint.SetAxis(Vector2.UnitY);
wheelJoint.SetFrequencyHz(suspensionFrequency);
wheelJoint.SetDampingRatio(suspensionDamping);
// Each wheel has a particle emitter to emit particles when it's in contact with the surface
Node particlesNode = Node.Scene.CreateChild();
particlesNode.SetPosition(new Vector3(relativePosition.X, relativePosition.Y, 14));
ParticleEmitter2D particleEmitter = particlesNode.CreateComponent <ParticleEmitter2D>();
particleEmitter.SetEffect(particles);
// We create a new Wheel struct and add to the _wheels list
_wheels.Add(new Wheel(wheelRigidBody, wheelJoint, particleEmitter, distanceToEmitParticles));
return(wheelNode);
}
public Node CreateHead(Sprite2D sprite, Vector3 relativePosition, float colliderRadius, Vector2 neckAnchor)
{
Node head = Racer2D.CreateSpriteNode(sprite);
head.SetPosition(relativePosition);
Racer2D.AddCollider <CollisionCircle2D>(head).SetRadius(colliderRadius);
// This is the actual neck joint
ConstraintRevolute2D joint = head.CreateComponent <ConstraintRevolute2D>();
joint.SetOtherBody(_rigidBody);
joint.SetAnchor(neckAnchor);
// This is the spring, it's attached to the body with an offset
ConstraintDistance2D spring = head.CreateComponent <ConstraintDistance2D>();
spring.SetOtherBody(_rigidBody);
spring.SetOwnerBodyAnchor(-Vector2.UnitY * 2);
spring.SetOtherBodyAnchor(Node.WorldToLocal2D(head.WorldPosition2D - Vector2.UnitY * 2));
spring.SetFrequencyHz(3);
spring.SetDampingRatio(0.4f);
return(head);
}
