urho3d/Source/Samples/46_RaycastVehicle/Vehicle.h

//
// Copyright (c) 2008-2017 the Urho3D project.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// THE SOFTWARE.
//

#pragma once

#include <Urho3D/Input/Controls.h>
#include <Urho3D/Physics/PhysicsUtils.h>
#include <Urho3D/Scene/LogicComponent.h>

namespace Urho3D
{
    class Constraint;
    class Node;
    class RigidBody;
}

using namespace Urho3D;

const int CTRL_FORWARD = (1 << 0);
const int CTRL_BACK = (1 << 1);
const int CTRL_LEFT = (1 << 2);
const int CTRL_RIGHT = (1 << 3);
const int CTRL_BRAKE = (1 << 4);
const float YAW_SENSITIVITY = 0.1f;
const float ENGINE_POWER = 10.0f;
const float MAX_WHEEL_ANGLE = 22.5f;

// Vehicle component, responsible for physical movement according to controls.
// Encapsulates RaycastVehicle
class Vehicle : public LogicComponent
{
    URHO3D_OBJECT(Vehicle, LogicComponent)

public :
    /// Construct.
    Vehicle(Context* context);
    /// Destruct.
    ~Vehicle();

    /// Register object factory and attributes.
    static void RegisterObject(Context* context);

    /// Perform post-load after deserialization. Acquire the components from the scene nodes.
    virtual void ApplyAttributes();

    /// Initialize the vehicle. Create rendering and physics components. Called by the application.
    void Init();

    /// Handle physics world update. Called by LogicComponent base class.
    virtual void FixedUpdate(float timeStep);
    /// Updating wheel effects here.
    virtual void PostUpdate(float timeStep);

    /// Movement controls.
    Controls controls_;

    /// Get steering value.
    float GetSteering() { return steering_; }

    /// Set steering value.
    void SetSteering(float steering) { steering_ = steering; }

    /// Get wheel radius.
    float GetWheelRadius() { return wheelRadius_; }

    /// Get wheel width.
    float GetWheelWidth() { return wheelWidth_; }

private:
    /// Creates particle emitter.
    void CreateEmitter(Vector3 place);

    /// Current left/right steering amount (-1 to 1.)
    float steering_;
    /// Tmp storage for steering
    float vehicleSteering_;
    /// Linear momentum supplied by engine to RigidBody
    float engineForce_;
    /// Rotational momentum preventing (dampening) wheels rotation
    float brakingForce_;
    /// Maximum linear momentum supplied by engine to RigidBody
    float maxEngineForce_;
    /// Stored wheel radius
    float wheelRadius_;
    /// Suspension rest length (in meters)
    float suspensionRestLength_;
    /// Width of wheel (used only in calculation of wheel placement)
    float wheelWidth_;
    /// Suspension stiffness
    float suspensionStiffness_;
    /// Suspension damping
    float suspensionDamping_;
    /// Suspension compression
    float suspensionCompression_;
    /// Wheel friction
    float wheelFriction_;
    /// Wheel roll influence (how much car will turn sidewise)
    float rollInfluence_;
    /// Emitter data for saving.
    Vector<Node*> particleEmitterNodeList_;
    /// Value to calculate acceleration.
    Vector3 prevVelocity_;
    /// Storing points for emitters
    Vector3 connectionPoints_[4];
    /// Do not recreate emitters if they are already created.
    bool emittersCreated;
};