C++ StepTimer::GetElapsedSeconds方法代码示例

//-----------------------------------------------------------------------------------------------------------------------------------
void Camera::Update(DX::StepTimer const& timer)
{
	// If the camera is fixed we should not do any more updating
	if (m_cameraMode == CameraMode::kFixed)
	{
		return;
	}

	KeyboardInput& keyboard = ScreenManager::GetKeyboardInput();
	Vector2 diff = Vector2::Zero;

	if (keyboard.IsKeyDown(Keyboard::Keys::Left))
	{
		diff.x = -1;
	}
	if (keyboard.IsKeyDown(Keyboard::Keys::Right))
	{
		diff.x = 1;
	}
	if (keyboard.IsKeyDown(Keyboard::Keys::Up))
	{
		diff.y = -1;
	}
	if (keyboard.IsKeyDown(Keyboard::Keys::Down))
	{
		diff.y = 1;
	}

	if (diff != Vector2::Zero)
	{
		diff.Normalize();
		m_position += diff * (float)timer.GetElapsedSeconds() * m_panSpeed;
	}
}

// Updates the world.
void Game::Update(DX::StepTimer const& timer)
{
    float elapsedTime = float(timer.GetElapsedSeconds());

    // TODO: Add your game logic here.
    elapsedTime;
}

// Called once per frame. Rotates the cube, and calculates and sets the model matrix
// relative to the position transform indicated by hologramPositionTransform.
void SpinningCubeRenderer::Update(const DX::StepTimer& timer)
{
    float const deltaTime = static_cast<float>(timer.GetElapsedSeconds());
    float const lerpDeltaTime = deltaTime * c_lerpRate;

    float3 const prevPosition = m_position;
    m_position = lerp(m_position, m_targetPosition, lerpDeltaTime);

    m_velocity = (prevPosition - m_position) / deltaTime;

    // Rotate the cube.
    // Convert degrees to radians, then convert seconds to rotation angle.
    float const radiansPerSecond = XMConvertToRadians(m_degreesPerSecond);
    float const totalRotation    = static_cast<float>(timer.GetTotalSeconds()) * radiansPerSecond;

    // Scale the cube down to 10cm
    float4x4 const modelScale = make_float4x4_scale({ 0.1f });
    float4x4 const modelRotation = make_float4x4_rotation_y(totalRotation);
    float4x4 const modelTranslation = make_float4x4_translation(m_position);

    m_modelConstantBufferData.model = modelScale * modelRotation * modelTranslation;

    // Use the D3D device context to update Direct3D device-based resources.
    const auto context = m_deviceResources->GetD3DDeviceContext();

    // Update the model transform buffer for the hologram.
    context->UpdateSubresource(
        m_modelConstantBuffer.Get(),
        0,
        nullptr,
        &m_modelConstantBufferData,
        0,
        0
        );
}

// Updates the world.
void Game::Update(DX::StepTimer const& timer)
{
    PIXBeginEvent(PIX_COLOR_DEFAULT, L"Update");

    float elapsedTime = float(timer.GetElapsedSeconds());
    UNREFERENCED_PARAMETER(elapsedTime);

    auto pad = m_gamePad->GetState(0);
    if (pad.IsConnected())
    {
        m_gamePadButtons.Update(pad);

        if (pad.IsViewPressed())
        {
            Windows::ApplicationModel::Core::CoreApplication::Exit();
        }
    }
    else
    {
        m_gamePadButtons.Reset();
    }

    UpdateGame();

    PIXEndEvent();
}

// Updates any time-based rendering resources (currently none).
// This method must be implemented for the Overlay class.
void SampleVirtualControllerRenderer::Update(DX::StepTimer const& timer)
{
    // Update the timers for fading out unused touch inputs.
    float frameTime = static_cast<float>(timer.GetElapsedSeconds());
    if (m_stickFadeTimer > 0)  m_stickFadeTimer -= frameTime;
    if (m_buttonFadeTimer > 0) m_buttonFadeTimer -= frameTime;
}

//-----------------------------------------------------------------------------------------------------------------------------------
void Button::Update(DX::StepTimer const& timer)
{
	UIObject::Update(timer);

	if (IsActive())
	{
		m_clickResetTimer += (float)timer.GetElapsedSeconds();
		if (m_clickResetTimer >= m_resetTime)
		{
			m_buttonState = ButtonState::kIdle;
		}

		// Lerp our current colour to the default one to create effect when mouse over button
		SetColour(Color::Lerp(GetColour(), m_defaultColour, (float)timer.GetElapsedSeconds() * 3));
	}
}

// Updates the world.
void Sample::Update(DX::StepTimer const& timer)
{
    PIXBeginEvent(PIX_COLOR_DEFAULT, L"Update");

    float elapsedTime = float(timer.GetElapsedSeconds());

    auto pad = m_gamePad->GetState(0);
    if (pad.IsConnected())
    {
        m_gamePadButtons.Update(pad);

        if (!m_ui->Update(elapsedTime, pad))
        {
            if (pad.IsViewPressed())
            {
                Windows::ApplicationModel::Core::CoreApplication::Exit();
            }
            if (pad.IsMenuPressed())
            {
                Windows::Xbox::UI::SystemUI::ShowAccountPickerAsync(nullptr,Windows::Xbox::UI::AccountPickerOptions::None);
            }
        }
    }
    else
    {
        m_gamePadButtons.Reset();
    }

    PIXEndEvent();
}

// Updates the world
void Game::Update(DX::StepTimer const& timer)
{
    float elapsedTime = float(timer.GetElapsedSeconds());

    // TODO: Add your game logic here
    elapsedTime;
    i_render_manager->update();
}

// Updates the world
void Game::Update(DX::StepTimer const& timer)
{
    float elapsedTime = float(timer.GetElapsedSeconds());

    // TODO: Add your game logic here
    m_screenManager->Update(elapsedTime);
    m_screenManager->HandleInput(elapsedTime);
}

// Updates the world
void Game::Update(DX::StepTimer const& timer)
{
    float elapsedTime = float(timer.GetElapsedSeconds());

    // TODO: Add your game logic here
	XMMATRIX m = XMMatrixIdentity();
	m = XMMatrixMultiply(m, XMMatrixTranslation(0.0f, 0.0f, 0.0f));
	XMStoreFloat4x4(&m_constantBufferData.model, m);
    elapsedTime;
}

// Updates the world.
void Sample::Update(DX::StepTimer const& timer)
{
    PIXBeginEvent(PIX_COLOR_DEFAULT, L"Update");

    float elapsedTime = float(timer.GetElapsedSeconds());

	// Update the rotation constant
	m_curRotationAngleRad += elapsedTime / 3.f;
	if (m_curRotationAngleRad >= XM_2PI)
	{
		m_curRotationAngleRad -= XM_2PI;
	}

	// Rotate the cube around the origin
	XMStoreFloat4x4(&m_worldMatrix, XMMatrixRotationY(m_curRotationAngleRad));

	// Setup our lighting parameters
	m_lightDirs[0] = XMFLOAT4(-0.577f, 0.577f, -0.577f, 1.0f);
	m_lightDirs[1] = XMFLOAT4(0.0f, 0.0f, -1.0f, 1.0f);

	m_lightColors[0] = XMFLOAT4(0.5f, 0.5f, 0.5f, 1.0f);
	m_lightColors[1] = XMFLOAT4(0.5f, 0.0f, 0.0f, 1.0f);

	// Rotate the second light around the origin
	XMMATRIX rotate = XMMatrixRotationY(-2.0f * m_curRotationAngleRad);
	XMVECTOR lightDir = XMLoadFloat4(&m_lightDirs[1]);
	lightDir = XMVector3Transform(lightDir, rotate);
	XMStoreFloat4(&m_lightDirs[1], lightDir);

	// Handle controller input for exit
    auto pad = m_gamePad->GetState(0);
    if (pad.IsConnected())
    {
        m_gamePadButtons.Update(pad);

        if (pad.IsViewPressed())
        {
            Windows::ApplicationModel::Core::CoreApplication::Exit();
        }
    }
    else
    {
        m_gamePadButtons.Reset();
    }

    auto kb = m_keyboard->GetState();
    m_keyboardButtons.Update(kb);

    if (kb.Escape)
    {
        Windows::ApplicationModel::Core::CoreApplication::Exit();
    }

    PIXEndEvent();
}

void PointLightRenderer::UpdateSpecularLight(const DX::StepTimer& gameTime)
{
	static float specularIntensity = 1.0f;
	GamePad::State gamePadState = mGamePad->CurrentState();
	if (gamePadState.IsConnected())
	{
		if (gamePadState.IsLeftTriggerPressed() && specularIntensity <= 1.0f)
		{
			specularIntensity += static_cast<float>(gameTime.GetElapsedSeconds());
			specularIntensity = min(specularIntensity, 1.0f);

			mPixelCBufferPerObjectData.SpecularColor = XMFLOAT3(specularIntensity, specularIntensity, specularIntensity);
		}

		if (gamePadState.IsRightTriggerPressed() && specularIntensity >= 0.0f)
		{
			specularIntensity -= (float)gameTime.GetElapsedSeconds();
			specularIntensity = max(specularIntensity, 0.0f);

			mPixelCBufferPerObjectData.SpecularColor = XMFLOAT3(specularIntensity, specularIntensity, specularIntensity);
		}

		static float specularPower = mPixelCBufferPerObjectData.SpecularPower;

		if (mGamePad->IsButtonDown(GamePadButton::DPadUp) && specularPower < UCHAR_MAX)
		{
			specularPower += LightModulationRate * static_cast<float>(gameTime.GetElapsedSeconds());
			specularPower = min(specularPower, static_cast<float>(UCHAR_MAX));

			mPixelCBufferPerObjectData.SpecularPower = specularPower;
		}

		if (mGamePad->IsButtonDown(GamePadButton::DPadDown) && specularPower > 1.0f)
		{
			specularPower -= LightModulationRate * static_cast<float>(gameTime.GetElapsedSeconds());
			specularPower = max(specularPower, 1.0f);

			mPixelCBufferPerObjectData.SpecularPower = specularPower;
		}
	}
}

//-----------------------------------------------------------------------------------------------------------------------------------
void RigidBody::Update(DX::StepTimer const& timer)
{
	float elapsedSeconds = (float)timer.GetElapsedSeconds();

	// Update the rotation and angular components
	m_angularVelocity += m_angularAcceleration * elapsedSeconds;
	m_parent->SetLocalRotation(m_angularVelocity * elapsedSeconds + m_parent->GetLocalRotation());

	// Update the position and linear components (it IS minus because of the screen coords
	m_linearVelocity += m_linearAcceleration * elapsedSeconds;
	m_parent->SetLocalPosition(m_parent->GetLocalPosition() - Vector2::Transform(m_linearVelocity, Matrix::CreateRotationZ(m_parent->GetLocalRotation())) * elapsedSeconds);
}

//-----------------------------------------------------------------------------------------------------------------------------------
void UIObject::Update(DX::StepTimer const& timer)
{
	BaseObject::Update(timer);

	m_currentLifeTime += (float)timer.GetElapsedSeconds();
	if (m_currentLifeTime > m_lifeTime)
	{
		// This UIObject has been alive for longer than its lifetime so it dies
		// and will be cleared up by whatever manager is in charge of it
		Die();
	}
}

// Updates the world
void Game::Update(DX::StepTimer const& timer)
{
    float elapsedTime = float(timer.GetElapsedSeconds());

    // TODO: Add your game logic here
    elapsedTime;

    for(auto & player: m_players)
    {
        player->Update();
    }
}