From b0d2fe7a1fa3eecb2dcd811cc163b366bb61640c Mon Sep 17 00:00:00 2001
From: Felix Ableitner <felixableitner@gmail.com>
Date: Tue, 11 Sep 2012 16:48:28 +0200
Subject: [PATCH] Added health to actor, bullets can damage and kill.

---
 source/abstract/Actor.cpp | 25 ++++++++++++++++++++++++-
 source/abstract/Actor.h   |  9 ++++++++-
 source/effects/Bullet.cpp |  5 +++++
 source/sprite/Enemy.cpp   |  5 +++--
 source/sprite/Player.cpp  |  1 +
 5 files changed, 41 insertions(+), 4 deletions(-)

diff --git a/source/abstract/Actor.cpp b/source/abstract/Actor.cpp
index 2d4cc84..3e7318f 100755
--- a/source/abstract/Actor.cpp
+++ b/source/abstract/Actor.cpp
@@ -15,7 +15,9 @@ std::vector<Actor*> Actor::mInstances = std::vector<Actor*>();
 /**
  * Saves pointer to this instance in static var for think().
  */
-Actor::Actor() {
+Actor::Actor(int health) :
+	mMaxHealth(health),
+	mCurrentHealth(health) {
 	mInstances.push_back(this);
 }
 
@@ -39,3 +41,24 @@ Actor::think(float elapsedTime) {
 		i->onThink(elapsedTime);
 	}
 }
+
+/**
+ * Subtracts health from Actor.
+ *
+ * @param damage Amount of health to subtract.
+ */
+void
+Actor::onDamage(int damage) {
+	mCurrentHealth -= damage;
+	if (mCurrentHealth <= 0) {
+		mCurrentHealth = 0;
+		onDeath();
+	}
+}
+
+/**
+ * Called when health reaches zero. Does nothing by default.
+ */
+void
+Actor::onDeath() {
+}
diff --git a/source/abstract/Actor.h b/source/abstract/Actor.h
index d3781f8..50b9f68 100755
--- a/source/abstract/Actor.h
+++ b/source/abstract/Actor.h
@@ -16,11 +16,13 @@
 class Actor {
 // Public functions.
 public:
-	Actor();
+	Actor(int health);
 	virtual ~Actor() = 0;
 
 	static void think(float elapsedTime);
 
+	void onDamage(int damage);
+
 // Protected functions.
 protected:
 	/**
@@ -30,9 +32,14 @@ protected:
 	 */
 	virtual void onThink(float elapsedTime) = 0;
 
+	virtual void onDeath();
+
 // Private variables.
 private:
 	static std::vector<Actor*> mInstances;
+
+	const int mMaxHealth;
+	int mCurrentHealth; //< Current health. Between 0 and mMaxHealth.
 };
 
 #endif /* DG_ACTOR_H_ */
diff --git a/source/effects/Bullet.cpp b/source/effects/Bullet.cpp
index 3abf1a5..224a5b0 100755
--- a/source/effects/Bullet.cpp
+++ b/source/effects/Bullet.cpp
@@ -7,6 +7,7 @@
 
 #include "Bullet.h"
 
+#include "../abstract/Actor.h"
 #include "../util/Log.h"
 
 const float Bullet::SPEED = 500.0f;
@@ -35,6 +36,10 @@ Bullet::onCollide(Physical& other, uint16 type) {
 	// Make sure we do not damage twice.
 	if (!getDelete()) {
 		// Call onShot on other, with damage as param.
+		if (type == CATEGORY_ACTOR) {
+			Actor& a = dynamic_cast<Actor&>(other);
+			a.onDamage(10);
+		}
 		setDelete(true);
 	}
 }
diff --git a/source/sprite/Enemy.cpp b/source/sprite/Enemy.cpp
index 24e74e2..2ce5aa7 100644
--- a/source/sprite/Enemy.cpp
+++ b/source/sprite/Enemy.cpp
@@ -8,8 +8,9 @@
 #include "Enemy.h"
 
 Enemy::Enemy(b2World& world, const Vector2f& position) :
-Sprite("enemy.png", PhysicalData(position, Vector2i(50, 50), world,
-		CATEGORY_ACTOR, MASK_ALL, true)) {
+		Sprite("enemy.png", PhysicalData(position, Vector2i(50, 50), world,
+		       CATEGORY_ACTOR, MASK_ALL, true)),
+		Actor(100) {
 
 }
 
diff --git a/source/sprite/Player.cpp b/source/sprite/Player.cpp
index ec64937..62286be 100644
--- a/source/sprite/Player.cpp
+++ b/source/sprite/Player.cpp
@@ -20,6 +20,7 @@ const float Player::SPEED = 100.0f;
 Player::Player(b2World& world, Collection& collection, const Vector2f& position) :
 		Sprite("player.png", PhysicalData(position, Vector2i(50, 50), world,
 				CATEGORY_ACTOR, MASK_ALL, true)),
+		Actor(100),
 		mWeapon(*this, collection, world),
 		mDestination(Vector2i(50, 50)) {
 }