Bullets are inserted at offset to avoid collisions on insert.

source/effects/Bullet.h

@@ -27,7 +27,7 @@ public:
 	static const Vector2i SIZE;
 // Private variables.
 private:
-	static const float SPEED;
+	static const float SPEED; //< If speed is too low, bullets push each other away on insert.
 	Physical& mShooter;
 	const int mDamage;
 };

source/items/Weapon.cpp

@@ -7,6 +7,10 @@
 
 #include "Weapon.h"
 
+#include <algorithm>
+
+#include <thor/Vectors.hpp>
+
 #include "../util/Collection.h"
 #include "../effects/Bullet.h"
 #include "../util/Loader.h"
@@ -14,11 +18,16 @@
 
 const int Weapon::BULLET_DAMAGE = 10;
 
-Weapon::Weapon(Physical& holder, Collection& collection, b2World& world) :
+Weapon::Weapon(Physical& holder, Collection& collection, b2World& world,
+	const Vector2i& holderSize) :
 		Emitter(collection),
 		mHolder(holder),
-		mBulletTexture(ResourceManager::i().acquire(Loader::i().fromFile<sf::Texture>("bullet.png"))),
+		mBulletTexture(ResourceManager::i()
-		mWorld(world) {
+                         .acquire(Loader::i().fromFile<sf::Texture>("bullet.png"))),
+		mWorld(world),
+		mOffset(0, std::max(holderSize.x, holderSize.y) / 2 +
+			b2_linearSlop +
+			std::max(Bullet::SIZE.x, Bullet::SIZE.y) / 2) {
 }
 
 Weapon::~Weapon() {
@@ -35,6 +44,9 @@ Weapon::fire() {
 
 std::shared_ptr<Particle>
 Weapon::createParticle() {
-	return std::shared_ptr<Particle>(new Bullet(mHolder.getPosition(), mWorld, mBulletTexture,
+	// Minus to account for positive y-axis going downwards in SFML.
-			mHolder, mHolder.getAngle(), BULLET_DAMAGE));
+	Vector2f offset(- mOffset);
+	thor::rotate(offset, mHolder.getAngle());
+	return std::shared_ptr<Particle>(new Bullet(mHolder.getPosition() + offset,
+			mWorld, mBulletTexture, mHolder, mHolder.getAngle(), BULLET_DAMAGE));
 }

source/items/Weapon.h

@@ -21,7 +21,7 @@
 class Weapon : public Emitter {
 // Public functions.
 public:
-	Weapon(Physical& holder, Collection& collection, b2World& world);
+	Weapon(Physical& holder, Collection& collection, b2World& world, const Vector2i& holderSize);
 	~Weapon();
 
 	void fire();
@@ -37,6 +37,7 @@ private:
 	Physical& mHolder;
 	std::shared_ptr<sf::Texture> mBulletTexture;
 	b2World& mWorld;
+	const Vector2f mOffset; //< Offset to the point where bullets are inserted (from holder center).
 };
 
 #endif /* DG_WEAPON_H_ */

source/sprite/Player.cpp

@@ -22,7 +22,7 @@ Player::Player(b2World& world, Collection& collection, const Vector2f& position)
 		Sprite("player.png", PhysicalData(position, SIZE, world,
 				CATEGORY_ACTOR, MASK_ALL, true)),
 		Actor(100),
-		mWeapon(*this, collection, world),
+		mWeapon(*this, collection, world, SIZE),
 		mDestination(Vector2i(50, 50)) {
 }