---恢复内容开始---

画线：

ID2D1RenderTarget::DrawLine

virtual void DrawLine(
                  D2D1_POINT_2F point0,//起点
                  D2D1_POINT_2F point1,//终点
  [in]            ID2D1Brush *brush,
                  FLOAT strokeWidth = 1.0f,//线条粗细
  [in, optional]  ID2D1StrokeStyle *strokeStyle = NULL//可省略
) = 0;

椭圆：

struct D2D1_ELLIPSE {
  D2D1_POINT_2F point;
  FLOAT         radiusX;
  FLOAT         radiusY;
};

矩形：

圆角矩形：

struct D2D1_ROUNDED_RECT {
  D2D1_RECT_F rect;
  FLOAT       radiusX;
  FLOAT       radiusY;
};

画轮廓：

ID2D1RenderTarget::DrawEllipse

void DrawEllipse(
  [ref]           const D2D1_ELLIPSE &ellipse,
  [in]            ID2D1Brush *brush,
                  FLOAT strokeWidth = 1.0f,
  [in, optional]  ID2D1StrokeStyle *strokeStyle = NULL
);

ID2D1RenderTarget::DrawRectangle

void DrawRectangle(
  [ref]           const D2D1_RECT_F &rect,
  [in]            ID2D1Brush *brush,
                  FLOAT strokeWidth = 1.0f,
  [in, optional]  ID2D1StrokeStyle *strokeStyle = NULL
);

ID2D1RenderTarget::DrawRoundedRectangle

void DrawRoundedRectangle(
  [ref]           const D2D1_ROUNDED_RECT &roundedRect,
  [in]            ID2D1Brush *brush,
                  FLOAT strokeWidth = 1.0f,
  [in, optional]  ID2D1StrokeStyle *strokeStyle = NULL
);

填充：

ID2D1RenderTarget::FillEllipse

void FillEllipse(
  [ref]  const D2D1_ELLIPSE &ellipse,
  [in]   ID2D1Brush *brush
);

ID2D1RenderTarget::FillRectangle 

void FillRectangle(
  [ref]  const D2D1_RECT_F &rect,
  [in]   ID2D1Brush *brush
);

ID2D1RenderTarget::FillRoundedRectangle

void FillRoundedRectangle(
  [ref]  const D2D1_ROUNDED_RECT &roundedRect,
  [in]   ID2D1Brush *brush
);

---恢复内容结束---