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First copy of Chapter 5 code
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‎Chapter05/Actor.cpp‎

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// ----------------------------------------------------------------
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// From Game Programming in C++ by Sanjay Madhav
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// Copyright (C) 2017 Sanjay Madhav. All rights reserved.
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//
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// Released under the BSD License
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// See LICENSE.txt for full details.
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// ----------------------------------------------------------------
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#include "Actor.h"
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#include "Game.h"
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#include "Component.h"
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#include <algorithm>
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Actor::Actor(Game* game)
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:mState(EActive)
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,mPosition(Vector2::Zero)
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,mScale(1.0f)
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,mRotation(0.0f)
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,mGame(game)
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{
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mGame->AddActor(this);
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}
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Actor::~Actor()
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{
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mGame->RemoveActor(this);
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// Need to delete components
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// Because ~Component calls RemoveComponent, need a different style loop
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while (!mComponents.empty())
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{
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delete mComponents.back();
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}
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}
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void Actor::Update(float deltaTime)
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{
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if (mState == EActive)
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{
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UpdateComponents(deltaTime);
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UpdateActor(deltaTime);
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}
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}
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void Actor::UpdateComponents(float deltaTime)
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{
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for (auto comp : mComponents)
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{
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comp->Update(deltaTime);
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}
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}
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void Actor::UpdateActor(float deltaTime)
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{
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}
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void Actor::ComputeWorldTransform()
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{
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mWorldTransform = Matrix4::CreateScale(mScale);
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mWorldTransform *= Matrix4::CreateRotationZ(mRotation);
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mWorldTransform *= Matrix4::CreateTranslation(Vector3(mPosition.x, mPosition.y, 0.0f));
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}
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void Actor::AddComponent(Component* component)
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{
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mComponents.emplace_back(component);
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std::sort(mComponents.begin(), mComponents.end(), [](Component* a, Component* b) {
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return a->GetUpdateOrder() < b->GetUpdateOrder();
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});
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}
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void Actor::RemoveComponent(Component* component)
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{
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auto iter = std::find(mComponents.begin(), mComponents.end(), component);
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if (iter != mComponents.end())
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{
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mComponents.erase(iter);
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}
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}

‎Chapter05/Actor.h‎

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// ----------------------------------------------------------------
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// From Game Programming in C++ by Sanjay Madhav
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// Copyright (C) 2017 Sanjay Madhav. All rights reserved.
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//
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// Released under the BSD License
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// See LICENSE.txt for full details.
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// ----------------------------------------------------------------
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#pragma once
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#include <vector>
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#include "Math.h"
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class Actor
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{
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public:
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enum State
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{
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EActive,
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EPaused,
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EDead
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};
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Actor(class Game* game);
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virtual ~Actor();
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// Update function called from Game (not overridable)
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void Update(float deltaTime);
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// Updates all the components attached to the actor (not overridable)
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void UpdateComponents(float deltaTime);
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// Any actor-specific update code (overridable)
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virtual void UpdateActor(float deltaTime);
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// Getters/setters
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const Vector2& GetPosition() const { return mPosition; }
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void SetPosition(const Vector2& pos) { mPosition = pos; ComputeWorldTransform(); }
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float GetScale() const { return mScale; }
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void SetScale(float scale) { mScale = scale; ComputeWorldTransform(); }
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float GetRotation() const { return mRotation; }
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void SetRotation(float rotation) { mRotation = rotation; ComputeWorldTransform(); }
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void ComputeWorldTransform();
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const Matrix4& GetWorldTransform() const { return mWorldTransform; }
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Vector2 GetForward() const { return Vector2(Math::Cos(mRotation), Math::Sin(mRotation)); }
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State GetState() const { return mState; }
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void SetState(State state) { mState = state; }
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class Game* GetGame() { return mGame; }
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// Add/remove components
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void AddComponent(class Component* component);
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void RemoveComponent(class Component* component);
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private:
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// Actor's state
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State mState;
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// Transform
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Matrix4 mWorldTransform;
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Vector2 mPosition;
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float mScale;
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float mRotation;
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std::vector<class Component*> mComponents;
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class Game* mGame;
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};

‎Chapter05/Assets/Airplane.png‎

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‎Chapter05/Assets/Base.png‎

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‎Chapter05/Assets/LICENSE.txt‎

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These sprites created by Kenney.nl
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Used under CC0 license.

‎Chapter05/Assets/Missile.png‎

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‎Chapter05/Assets/Projectile.png‎

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‎Chapter05/Assets/TileBrown.png‎

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‎Chapter05/Assets/TileBrownSelected.png‎

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‎Chapter05/Assets/TileGreen.png‎

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