void GraphicsWindow::OnPaint()
{
HRESULT hr = CreateGraphicsResources();
if (SUCCEEDED(hr))
{
PAINTSTRUCT ps;
BeginPaint(m_hwnd, &ps);
pRenderTarget->BeginDraw();
pRenderTarget->Clear( D2D1::ColorF(D2D1::ColorF::SkyBlue) ); // Clear the device to blue
// Draw hands
SYSTEMTIME time;
GetLocalTime(&time);
// 60 minutes = 30 degrees, 1 minute = 0.5 degree
const float fHourAngle = (360.0f / 12) * (time.wHour) + (time.wMinute * 0.5f);
const float fMinuteAngle =(360.0f / 60) * (time.wMinute);
const float fSecondAngle = (360.0f / 60) * (time.wSecond);
// Draw all stored shapes
for (auto i = ellipses.begin(); i != ellipses.end(); ++i)
{
(*i)->Draw(pRenderTarget, pBrush);
// Outline the selected item inside the loop to ensure it is at the right depth
if (Selection() == *i)
{
pBrush->SetColor(D2D1::ColorF(D2D1::ColorF::Red)); // SetColor is a non-expensive operation
pRenderTarget->DrawEllipse(Selection()->ellipse, pBrush, 2.0f);
}
// Add clock hands to the ellipses, because.. why not
pBrush->SetColor(D2D1::ColorF(D2D1::ColorF::Black));
DrawClockHand(*i, 0.6f, fHourAngle, 6);
DrawClockHand(*i, 0.85f, fMinuteAngle, 4);
DrawClockHand(*i, 0.85f, fSecondAngle, 2);
// Restore the identity transformation for the next ellipse after rotating the clock hands
pRenderTarget->SetTransform( D2D1::Matrix3x2F::Identity() );
}
hr = pRenderTarget->EndDraw(); // If an error occurs during any of the draw commands (begin, clear, fillellipse) it is returned here
if (FAILED(hr) || hr == D2DERR_RECREATE_TARGET)
{
// If we failed for some reason, including if the device has become unavailable and we need to recreate then discard current resources
DiscardGraphicsResources();
}
EndPaint(m_hwnd, &ps);
}
}
void Scene::RenderScene()
{
m_pRenderTarget->Clear(D2D1::ColorF(D2D1::ColorF::CornflowerBlue));
m_pRenderTarget->FillEllipse(m_ellipse, m_pFill);
DrawClockHand(0.6f, 0, 6);
m_pRenderTarget->SetTransform(D2D1::Matrix3x2F::Identity());
}
