Box2D＋DXライブラリによるマリオもどきのテスト　その2

void CreateHero(float sx, float sy){
	//ボディ定義
	b2BodyDef bodyDef;
	bodyDef.type = b2_dynamicBody;	//動的ボディ
	bodyDef.position.Set(PHS(sx), PHS(sy));
	//ボディ作成
	b2Body* body = g_world.CreateBody(&bodyDef);
	//胴体のフィクスチャ定義
	b2FixtureDef fixtureDef;
	b2PolygonShape box;
	box.SetAsBox(PHS(16.0f), PHS(10.0f));
	fixtureDef.shape = &box;
	fixtureDef.density = 1.0f;		 //密度
	fixtureDef.restitution = 0.1f;//反発力
	fixtureDef.friction = 0.3f;	//摩擦力
	fixtureDef.filter.categoryBits = 1;
	fixtureDef.filter.maskBits = 1+2;
	g_stage.hero_head =	body->CreateFixture(&fixtureDef);
	//拳
	box.SetAsBox(PHS(2.0f), PHS(3.0f),
		b2Vec2( 0.0f, -PHS(15.0f)), 0.0f);
	g_stage.hero_fist = body->CreateFixture(&fixtureDef);
	//下半身
	b2CircleShape circle;
	circle.m_radius = PHS(10.0f);
	circle.m_p = b2Vec2(PHS(6.0f), PHS(18.0f));//位置
	fixtureDef.shape = &circle;
	fixtureDef.friction = 0.8f;	//摩擦力
	g_stage.hero_reg1 = body->CreateFixture(&fixtureDef);
	circle.m_p = b2Vec2(-PHS(6.0f), PHS(18.0f));
	g_stage.hero_reg2 = body->CreateFixture(&fixtureDef);
	//キャラクター設定
    g_stage.hero.body = body;
	g_stage.hero.type = HERO_MARION;
	g_stage.hero.body->SetUserData(&g_stage.hero);
}

//衝突判定
void Collision(){
	//接触確認ループ
	for(b2Contact* c = g_world.GetContactList(); c!=NULL;
		c = c->GetNext())
	{
		if(c->IsTouching() == false) continue;
		//接触しているボディを取り出す
		b2Body* bd[2];
		b2Fixture* fx[2];
		fx[0] = c->GetFixtureA();
		fx[1] = c->GetFixtureB();
		bd[0] = fx[0]->GetBody();
		bd[1] = fx[1]->GetBody();
		//ボディチェック
		for(int i=0; i<2; i++){
			b2Body *obd = bd[ (i+1) % 2];//衝突相手
			Character *ch = (Character *)bd[i]->GetUserData();
			Character *och = (Character *)obd->GetUserData();
			if(ch != NULL && och != NULL){
				//ヒーロー関連のチェック
				if(ch->type == HERO_MARION)
				{
					//接地チェック
					if( fx[i] == g_stage.hero_reg1 ||
						fx[i] == g_stage.hero_reg2)
					{
						g_stage.isontheground = true;
						//モンスター踏みつぶし
						if(och->type >= MAP_MONSTER_MASHROOM)
						{
							och->damage = 100.0f;
						}
					}
					//壊せる壁に拳が当たる
					if(fx[i] == g_stage.hero_fist){
						if(och->type == MAP_FRAGILE){
							och->damage = 100.0f;
						}
					}

//イベント構造体
struct Event{
	int type;		//イベントの種類（モンスターの種類）
	bool used;		//使用中（発動前）フラグ
	float x,y;		//位置
	float range;	//範囲
};

//モンスター左右方向転換
if(ch->type >= MAP_MONSTER_MASHROOM){
	b2Manifold *manifold = c->GetManifold();
	if(manifold->type == b2Manifold::e_faceA){
		//進行方向で衝突が起きていたら
		if( (manifold->localNormal.x < -0.2f &&
			ch->vecx > 0.0f) ||
			(manifold->localNormal.x > 0.2f &&
			ch->vecx < 0.0f) )
		{
			//移動方向を逆転
			ch->vecx = -ch->vecx;
		}
	}
}