InkD2DRenderer class

Article
04/19/2016

Implements the IInkD2DRenderer interface.

An IInkD2DRenderer object enables the rendering of ink strokes onto the designated Direct2D device context of a Universal Windows app, instead of the default InkCanvas control.

Members

The InkD2DRenderer class inherits from the IUnknown interface. InkD2DRenderer also has these types of members:

Methods

Methods

The InkD2DRenderer class has these methods.

Method	Description
Draw	Renders the ink stroke to the designated Direct2D device context of the app.

Creation\Access Functions

Use the following to retrieve a reference to the object:

CoCreateInstance

Call CoCreateInstance with the class identifier InkD2DRenderer.

This snippet is taken from the "InkRenderer.cpp" file of the Complex ink sample.

CoCreateInstance(__uuidof(InkD2DRenderer),
  nullptr,
  CLSCTX_INPROC_SERVER,
  IID_PPV_ARGS(&_spInkD2DRenderer));

Examples

This snippet from the "SceneComposer.cpp" file of the Complex ink sample demonstrates the rendering of a collection of ink strokes to a Direct2D device context.


_inkRenderer->Render(strokes, _deviceResources->GetD2DDeviceContext());
strokes->Clear();

This snippet from the "InkRenderer.cpp" file of the Complex ink sample shows the Render method (called in the previous snippet) that calls the Draw method for rendering the strokes.

void InkRenderer::Render(
    Platform::Collections::Vector<
        Windows::UI::Input::Inking::InkStroke^>^ strokes,
        Microsoft::WRL::ComPtr<ID2D1DeviceContext> d2dContext)
{
    HRESULT hr = S_OK;
    if (_spInkD2DRenderer != nullptr)
    {
        if (strokes != nullptr && strokes->Size > 0)
        {
            // Cast the stroke collection into IUnknown to call Inkd2dRenderer
            ComPtr<IUnknown> spUnkStrokes = 
                reinterpret_cast<IUnknown*>(reinterpret_cast<__abi_IUnknown*>(strokes));
            hr = _spInkD2DRenderer->Draw(d2dContext.Get(), spUnkStrokes.Get(), false);
            if (FAILED(hr))
            {
                DX::ThrowIfFailed(hr);
            }
        }
    }
}

Requirements

Minimum supported client	Windows 10
Minimum supported server	None supported
Header	Inkrenderer.h
IDL	Inkrenderer.idl
IID	IID_IInkD2DRenderer is defined as 4044e60c-7b01-4671-a97c-04e0210a07a5

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