Simple Exponential Moving Average Filter for Dasher Mouse Input

DasherMouseInput.cpp

// replace the content of the function with the one below:

[...]

bool CDasherMouseInput::GetScreenCoords(screenint &iX, screenint &iY, CDasherView *pView)
{
	POINT mousepos;
  GetCursorPos(&mousepos);

  ScreenToClient(m_hwnd, &mousepos);

	const float smoothing = (SmoothedPositionX < 0) ? 1.0f : SmoothingFactor;

	SmoothedPositionX = smoothing * mousepos.x + (1.0f - smoothing) * SmoothedPositionX;
	SmoothedPositionY = smoothing * mousepos.y + (1.0f - smoothing) * SmoothedPositionY;

	iX = static_cast<Dasher::screenint>(SmoothedPositionX);
	iY = static_cast<Dasher::screenint>(SmoothedPositionY);

	return true;
}

[...]

DasherMouseInput.h

// Add the three float variables below

[...]

class Dasher::CDasherMouseInput : public CScreenCoordInput {

  [...]

private:
  float SmoothedPositionX = -1.0f;
  float SmoothedPositionY = -1.0f;
  const float SmoothingFactor = 0.05f;
};

[...]