C++ fixed类代码示例

fixed CTerrain::GetExactGroundLevelFixed(fixed x, fixed z) const
{
	// Clamp to size-2 so we can use the tiles (xi,zi)-(xi+1,zi+1)
	const ssize_t xi = clamp((ssize_t)(x / (int)TERRAIN_TILE_SIZE).ToInt_RoundToZero(), (ssize_t)0, m_MapSize-2);
	const ssize_t zi = clamp((ssize_t)(z / (int)TERRAIN_TILE_SIZE).ToInt_RoundToZero(), (ssize_t)0, m_MapSize-2);

	const fixed one = fixed::FromInt(1);

	const fixed xf = clamp((x / (int)TERRAIN_TILE_SIZE) - fixed::FromInt(xi), fixed::Zero(), one);
	const fixed zf = clamp((z / (int)TERRAIN_TILE_SIZE) - fixed::FromInt(zi), fixed::Zero(), one);

	u16 h00 = m_Heightmap[zi*m_MapSize + xi];
	u16 h01 = m_Heightmap[(zi+1)*m_MapSize + xi];
	u16 h10 = m_Heightmap[zi*m_MapSize + (xi+1)];
	u16 h11 = m_Heightmap[(zi+1)*m_MapSize + (xi+1)];

	// Intermediate scaling of xf, so we don't overflow in the multiplications below
	// (h00 <= 65535, xf <= 1, max fixed is < 32768; divide by 2 here so xf1*h00 <= 32767.5)
	const fixed xf0 = xf / 2;
	const fixed xf1 = (one - xf) / 2;

	// Linearly interpolate
	return ((one - zf).Multiply(xf1 * h00 + xf0 * h10)
	              + zf.Multiply(xf1 * h01 + xf0 * h11)) / (int)(HEIGHT_UNITS_PER_METRE / 2);

	// TODO: This should probably be more like GetExactGroundLevel()
	// in handling triangulation properly
}

  void Rotate(const Angle alpha) {
    const auto sc = alpha.SinCos();
    const fixed sin = sc.first, cos = sc.second;
#ifdef FIXED_MATH
    long s = sin.as_glfixed();
    long c = cos.as_glfixed();
#else
    long s = sin * (1<<16);
    long c = cos * (1<<16);
#endif
    Rotatex(s, c);
  }

  void Scale(const fixed &factor) {
#ifdef FIXED_MATH
    Scalex(factor.as_glfixed_scale());
#else
    Scalex(factor * (1LL<<32));
#endif
  }

	virtual void Deserialize(const CParamNode& paramNode, IDeserializer& deserialize)
	{
		Init(paramNode);

		u32 oldSeed = GetActorSeed();

		SerializeCommon(deserialize);

		// If we serialized a different seed, reload actor
		if (oldSeed != GetActorSeed())
			ReloadActor();

		fixed repeattime = m_AnimSyncRepeatTime; // save because SelectAnimation overwrites it

		if (m_AnimRunThreshold.IsZero())
			SelectAnimation(m_AnimName, m_AnimOnce, m_AnimSpeed, m_SoundGroup);
		else
			SelectMovementAnimation(m_AnimRunThreshold);

		SetAnimationSyncRepeat(repeattime);

		if (m_Unit)
		{
			CmpPtr<ICmpOwnership> cmpOwnership(GetSimContext(), GetEntityId());
			if (cmpOwnership)
				m_Unit->GetModel().SetPlayerID(cmpOwnership->GetOwner());
		}
	}

const Color Faction::AdjustedColour(fixed population, bool inRange)
{
	Color result;
	result   = population == 0 ? BAD_FACTION_COLOUR : colour;
	result.a = population > 0  ? FACTION_BASE_ALPHA + (M_E + (logf(population.ToFloat() / 1.25))) / ((2 * M_E) + FACTION_BASE_ALPHA) : FACTION_BASE_ALPHA;
	result.a = inRange         ? 1.f : result.a;
	return result;
}

	virtual void SetAnimationSyncOffset(fixed actiontime)
	{
		if (m_Unit)
		{
			if (m_Unit->GetAnimation())
				m_Unit->GetAnimation()->SetAnimationSyncOffset(actiontime.ToFloat());
		}
	}

	virtual void SetAnimationSyncRepeat(fixed repeattime)
	{
		m_AnimSyncRepeatTime = repeattime;

		if (m_Unit)
		{
			if (m_Unit->GetAnimation())
				m_Unit->GetAnimation()->SetAnimationSyncRepeat(m_AnimSyncRepeatTime.ToFloat());
		}
	}

	virtual void SelectAnimation(std::string name, bool once, fixed speed, std::wstring soundgroup)
	{
		m_AnimRunThreshold = fixed::Zero();
		m_AnimName = name;
		m_AnimOnce = once;
		m_AnimSpeed = speed;
		m_SoundGroup = soundgroup;
		m_AnimDesync = fixed::FromInt(1)/20; // TODO: make this an argument
		m_AnimSyncRepeatTime = fixed::Zero();

		if (m_Unit)
		{
			m_Unit->SetEntitySelection(m_AnimName);
			if (m_Unit->GetAnimation())
				m_Unit->GetAnimation()->SetAnimationState(m_AnimName, m_AnimOnce, m_AnimSpeed.ToFloat(), m_AnimDesync.ToFloat(), m_SoundGroup.c_str());
		}
	}

fixed tanx(fixed x)
{
	return x.tan();
}

fixed cosx(fixed x)
{
	return x.cos();
}

fixed sinx(fixed x)
{
	return x.sin();
}

fixed ceilx(fixed fixedVal)
{
	return fixedVal.ceil();
}

fixed floorx(fixed fixedVal)
{
	return fixedVal.floor();
}

fixed logx(fixed fixedVal)
{
	return fixedVal.log();
}

fixed expx(fixed fixedVal)
{
	return fixedVal.exp();
}