基于VisualStudio11开发Windows8的Direct2DMetro应用程序范例（1）hello world

Direct2D是美国微软公司用来取代 DirectDraw 以及GDI, GDI+等新技术[1]，主要提供2D 动画的硬件加速，目前只支援 Windows Vista SP2以及Windows 7以上[2]。
 
Direct2D技术架构于Direct3D 10.1 API 之上，能够透过硬件加速功能来建立2D图形，而且完全支持透明和Alpha混合。Direct2D 亦支援软件实现（Software rasterizer），亦即在显卡不支持硬件加速情况下，Direct2D 仍可以使用软件方式描绘，且效果仍优于GDI。
 
Direct2D 可以使用DXGI（DirectX Graphics Infrastructure） 与交互操作，Direct2D还能很好的支持DirectWrite。
 
Direct2D的支持高品质的渲染，具有以下特点：
 支援ClearType 文字的呈现方式（DirectWrite 提供）
 消除原图锯齿状（Per primitive antialiasing）
 几何形状（直线，曲线）和位图绘制和填写。
 纯色（Solid color）、线性。
 描绘中间层。
 多元的几何操作（如unions, intersections, widening, outlining等）

在微软VS11提供了Direct模板

我们创建一个应用程序以后，

插入下列代码

请见代码分析

#include "pch.h"
#include "DWriteHelloWorld.h"

using namespace Microsoft::WRL;
using namespace Windows::ApplicationModel;
using namespace Windows::ApplicationModel::Core;
using namespace Windows::ApplicationModel::Activation;
using namespace Windows::UI::Core;
using namespace Windows::System;
using namespace Windows::Foundation;
using namespace Windows::Graphics::Display;

DWriteHelloWorld::DWriteHelloWorld()
{
}

void DWriteHelloWorld::CreateDeviceIndependentResources()
{
    DirectXBase::CreateDeviceIndependentResources();

    
    DX::ThrowIfFailed(
        m_dwriteFactory->CreateTextFormat(
            L"Gabriola",
            nullptr,
            DWRITE_FONT_WEIGHT_REGULAR,
            DWRITE_FONT_STYLE_NORMAL,
            DWRITE_FONT_STRETCH_NORMAL,
            64.0f,
            L"en-US", //locale
            &m_textFormat
            )
        );

    // Center the text horizontally and vertically.
    m_textFormat->SetTextAlignment(DWRITE_TEXT_ALIGNMENT_CENTER);
    m_textFormat->SetParagraphAlignment(DWRITE_PARAGRAPH_ALIGNMENT_CENTER);
}

void DWriteHelloWorld::CreateDeviceResources()
{
    DirectXBase::CreateDeviceResources();

    m_sampleOverlay = ref new SampleOverlay();

    m_sampleOverlay->Initialize(
        m_d2dDevice.Get(),
        m_d2dContext.Get(),
        m_wicFactory.Get(),
        m_dwriteFactory.Get(),
        "D2D Hello World sample by Microsoft MVP Yincheng"
        );

    DX::ThrowIfFailed(
        m_d2dContext->CreateSolidColorBrush(
            D2D1::ColorF(D2D1::ColorF::Black),
            &m_blackBrush
            )
        );
}

void DWriteHelloWorld::CreateWindowSizeDependentResources()
{
    DirectXBase::CreateWindowSizeDependentResources();

    Platform::String^ text = "Hello World By Microsoft MVP -Yincheng!";

    D2D1_SIZE_F size = m_d2dContext->GetSize();

    //创建文本输出设备
    DX::ThrowIfFailed(
        m_dwriteFactory->CreateTextLayout(
            text->Data(),                       
            text->Length(),                     
            m_textFormat.Get(),                 
            size.width,                        
            size.height,                        
            &m_textLayout
            )
        );


    DWRITE_TEXT_RANGE textRange = {21, 12}; 

    //设置文字大小
    m_textLayout->SetFontSize(100.0f, textRange);

    //创建图形文字显示设备
    DX::ThrowIfFailed(
        m_dwriteFactory->CreateTypography(
            &m_textTypography
            )
        );


    DWRITE_FONT_FEATURE fontFeature = {DWRITE_FONT_FEATURE_TAG_STYLISTIC_SET_6, 1};


    m_textTypography->AddFontFeature(fontFeature);

    //移动文字的长度
    textRange.length = text->Length();
    textRange.startPosition = 0;

    //显示文字
    DX::ThrowIfFailed(
        m_textLayout->SetTypography(
            m_textTypography.Get(),
            textRange
            )
        );

    //设置文字的长度与开始位置
    textRange.length = 12;
    textRange.startPosition = 21;

    //设置水平线
    m_textLayout->SetUnderline(TRUE, textRange);
    m_textLayout->SetFontWeight(DWRITE_FONT_WEIGHT_BOLD, textRange);
}

void DWriteHelloWorld::Render()
{
    m_d2dContext->BeginDraw();

    m_d2dContext->Clear(D2D1::ColorF(D2D1::ColorF::CornflowerBlue));
    m_d2dContext->SetTransform(D2D1::Matrix3x2F::Identity());

    m_d2dContext->DrawTextLayout(
        D2D1::Point2F(0.0f, 0.0f),
        m_textLayout.Get(),
        m_blackBrush.Get()
        );

    HRESULT hr = m_d2dContext->EndDraw();

    if (hr == D2DERR_RECREATE_TARGET)
    {
        m_d2dContext->SetTarget(nullptr);
        m_d2dTargetBitmap = nullptr;
        CreateWindowSizeDependentResources();
    }
    else
    {
        DX::ThrowIfFailed(hr);
    }

    m_sampleOverlay->Render();
}

void DWriteHelloWorld::Initialize(
    _In_ CoreApplicationView^ applicationView
    )
{
    applicationView->Activated +=
        ref new TypedEventHandler<CoreApplicationView^, IActivatedEventArgs^>(this, &DWriteHelloWorld::OnActivated);

    CoreApplication::Suspending +=
        ref new EventHandler<SuspendingEventArgs^>(this, &DWriteHelloWorld::OnSuspending);

    CoreApplication::Resuming +=
        ref new EventHandler<Platform::Object^>(this, &DWriteHelloWorld::OnResuming);
}

void DWriteHelloWorld::SetWindow(
    _In_ CoreWindow^ window
    )
{
    window->PointerCursor = ref new CoreCursor(CoreCursorType::Arrow, 0);

    window->SizeChanged +=
        ref new TypedEventHandler<CoreWindow^, WindowSizeChangedEventArgs^>(this, &DWriteHelloWorld::OnWindowSizeChanged);

    DisplayProperties::LogicalDpiChanged +=
        ref new DisplayPropertiesEventHandler(this, &DWriteHelloWorld::OnLogicalDpiChanged);

    DirectXBase::Initialize(window, DisplayProperties::LogicalDpi);
}

void DWriteHelloWorld::Load(
    Platform::String^ entryPoint
    )
{
}

void DWriteHelloWorld::Run()
{
    Render();
    Present();

    m_window->Dispatcher->ProcessEvents(CoreProcessEventsOption::ProcessUntilQuit);
}

void DWriteHelloWorld::Uninitialize()
{
}

void DWriteHelloWorld::OnWindowSizeChanged(
    _In_ CoreWindow^ sender,
    _In_ WindowSizeChangedEventArgs^ args
    )
{
    UpdateForWindowSizeChange();
    m_sampleOverlay->UpdateForWindowSizeChange();
    Render();
    Present();
}

void DWriteHelloWorld::OnLogicalDpiChanged(
    _In_ Platform::Object^ sender
    )
{
    SetDpi(DisplayProperties::LogicalDpi);
    Render();
    Present();
}

void DWriteHelloWorld::OnActivated(
    _In_ CoreApplicationView^ applicationView,
    _In_ IActivatedEventArgs^ args
    )
{
    m_window->Activate();
}

void DWriteHelloWorld::OnSuspending(
    _In_ Platform::Object^ sender,
    _In_ SuspendingEventArgs^ args
    )
{
}

void DWriteHelloWorld::OnResuming(
    _In_ Platform::Object^ sender,
    _In_ Platform::Object^ args
    )
{
}

IFrameworkView^ DirectXAppSource::CreateView()
{
    return ref new DWriteHelloWorld();
}

[Platform::MTAThread]
int main(Platform::Array<Platform::String^>^)
{
    auto directXAppSource = ref new DirectXAppSource();
    CoreApplication::Run(directXAppSource);
    return 0;
}

 

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