typedef struct _D3DCOLORVALUE {
    float r;　　//红色分量值，范围0-1
    float g;　　//绿色分量值，范围0-1
    float b;　　//蓝色分量值，范围0-1
    float a;　　//alpha分量值（透明度），范围0-1
} D3DCOLORVALUE;

D2D1::ColorF(0.0f, 0.0f, 0.0f, 1.0f);  　　　 //rgba形式
D2D1::ColorF(0x000000, 1.0f); 　　　　　　  　 //UINT32形式
D2D1::ColorF(D2D1::ColorF::Pink, 1.0f); 　　 //Enum形式特定值

//1初始化IWICImagingFactory
IWICImagingFactory *pIWICFactory;
CoInitialize(NULL);
CoCreateIstance(
 CLSID_WICImagingFactory,
 NULL,
 CLSCTX_INPROC_SERVER,
 IID_PPV_ARGS(&pIWICFactory)
);
ID2D1Bitmap *pBitmap;
IWICBitmapDecoder *pDecoder;
IWICBitmapFrameDecode *pSource;
IWICStream *pStream;
IWICFormatConverter *pConverter;
IWICBitmapScaler *pScaler;
//2初始化IWICBitmapDecoder
pIWICFactory->CreateDecoderFromFilename(
 "filename",　　　　//修改为图片的路径名
 NULL,
 GENERIC_READ,
 WICDecodeMetadataCacheOnload,
 &pDecoder
);
//3初始化IWICBitmapFrameDecode
pDecoder->GetFrame(0, &pSource);
//4初始化IWICBitmapScaler
pIWICFactory->CreateBitmapScaler(&pScaler);
pScaler->Initialize(
 pSource,
 width,  　　//缩放至width宽度
 height,  　 //缩放至height高度
 WICBitmapInterpolationModeCubic
);
//4初始化IWICFormatConverter
pIWICFactory->CreateFormatConverter(&pConverter);
pConverter->Initialize(
 pScaler,
 GUID_WICPixelFormat32bppPBGRA,
 WICBitmapDitherTypeNone,
 NULL,
 0.0f,
 WICBitmapPaletteTypeMedianCut
);
//5从WIC中加载位图
pRenderTarget->CreateBitmapFromWicBitmap(
 pConvert,
 NULL,
 &pBitmap
);
//6释放临时对象
XXXXX->Release();

ID2D1SolidColorBrush *pscBrush;
//创建单色画刷
RenderTarget->CreateSolidColorBrush(
 D2D1::ColorF(0, 1.0f),
 &pscBrush
);

ID2D1LinearGradientBrush *plgBrush;
ID2D1GradientStopCollection *pgsCollection;
//创建渐变节点数组
D2D1_FRADIENT_STOP gradientStops[2];
gradientStops[0] = {0.0f, D2D1::ColorF(0, 1.0f)};
gradientStops[1] = {1.0f, D2D1::ColorF(0xffffff, 1.0f)};
//创建渐变条（这一部分可以想象成ps中的那个渐变）
RenderTarget->CreateGradientStopCollection(
 gradientStops,       //渐变颜色点信息
 2,                   //渐变颜色点数量
 D2D1_GAMMA_2_2,   
 D2D1_EXTEND_MODE_CLAMP,
 &pGsCollection
);
//创建渐变刷
RenderTarget->CreateLinearGradientBrush(
 LinearGradientBrushProperties(
  D2D1::Point2F(0, 0),         //渐变线起始点（窗口坐标）
  D2D1::Point2F(150, 150)   　 //渐变线终点（窗口坐标）
 ),
 pgsCollection,
 &plgBrush
);

g_pTarget->CreateRadialGradientBrush(
 RadialGradientBrushProperties(
  Point2F(20,20),     　　//颜色中心
  Point2F(0, 0),         //颜色偏离中心
  20,                    //颜色x轴
  20                     //颜色y轴
 ),
 g_pGsCollection,
 &g_pRgBrush
);

//使用WIC从文件中加载资源后
pRenderTarget->CreateBitmapBrush(pBitmap, &BitmapBrush);

pRenderTarget->BeginDraw();
pRenderTarget->FillRectangle(&rect, pxxxBrush);
pRenderTarget->DrawRectangle(&rect, pxxxBrush);
pRenderTarget->EndDraw();