Action attack_dir(): Implement, trivially random now

README

@@ -23,6 +23,7 @@ The following inputs (in no particular order) are supported:
 	tick <ticknum>
 	BUMP
 		if received, the agent's move failed
+		(or attack of non-existent agent etc.)
 	DEAD
 		if received, the agent is dead!
 	energy <points>

agent.cc

@@ -45,6 +45,31 @@ agent::move_dir(int dir_x, int dir_y)
 	return true;
 }
 
+bool
+agent::attack_dir(int dir_x, int dir_y)
+{
+	if (dead)
+		return false;
+
+	class tile *t2 = &tile->tile_in_dir(dir_x, dir_y);
+	if (!t2->agent || t2->agent->dead)
+		return false;
+
+	class agent *a = t2->agent;
+	chenergy(world::attack_cost);
+	a->chenergy(world::defense_cost);
+	if (dead || a->dead)
+		return true;
+
+	int dice = rand() % (energy + a->energy);
+	if (dice < energy) {
+		a->die();
+	} else {
+		die();
+	}
+	return true;
+}
+
 void
 agent::chenergy(int delta)
 {

agent.h

@@ -25,6 +25,7 @@ public:
 	};
 
 	bool move_dir(int dir_x, int dir_y);
+	bool attack_dir(int dir_x, int dir_y);
 
 	void chenergy(int delta);
 	void die(void);

connection.cc

@@ -72,6 +72,13 @@ connection::actions(class agent &agent)
 			if (y < -1) y = -1; if (y > 1) y = 1;
 			if (!agent.move_dir(x, y))
 				bump();
+		} else if (!cmd.compare("attack_dir")) {
+			int x = 0, y = 0;
+			sscanf(line.c_str(), "%d %d", &x, &y);
+			if (x < -1) x = -1; if (x > 1) x = 1;
+			if (y < -1) y = -1; if (y > 1) y = 1;
+			if (!agent.attack_dir(x, y))
+				bump();
 		} else {
 			std::cout << "unknown line " << cmd << " " << line << " ...\n";
 		}

world.h

@@ -4,6 +4,8 @@
 struct world {
 	const static int newborn_energy = 500;
 	const static int move_cost = -10;
+	const static int attack_cost = -40;
+	const static int defense_cost = -20;
 	const static int sun_energy = 1;
 
 	const static int dead_body_energy = 500;