changepitch.cpp

Audacity是一款用於錄音和編輯聲音的、免費的開放源碼軟體。它可以執行於Mac OS X、Microsoft Windows、GNU/Linux和其它作業系統

	// from/to frequency controls
	if (m_pTextCtrl_FromFrequency) {
		wxString str;
		if (m_FromFrequency > 0.0)
			str.Printf(wxT("%.3f"), m_FromFrequency);
		else
			str = wxT("");
		m_pTextCtrl_FromFrequency->SetValue(str);
	}

	this->Update_Text_ToFrequency();

	
	// percent change controls
	this->Update_Text_PercentChange();
	this->Update_Slider_PercentChange();


   m_bLoopDetect = false;

	return true;
}

bool ChangePitchDialog::TransferDataFromWindow()
{
   double newDouble;
	wxString str;


	// from/to pitch controls
	if (m_pChoice_FromPitch) 
		m_FromPitchIndex = m_pChoice_FromPitch->GetSelection(); 

	if (m_pRadioBox_PitchUpDown)
		m_bWantPitchDown = (m_pRadioBox_PitchUpDown->GetSelection() == 1);

	if (m_pChoice_ToPitch) 
		m_ToPitchIndex = m_pChoice_ToPitch->GetSelection();


	// semitones change control
   if (m_pTextCtrl_SemitonesChange) {
      str = m_pTextCtrl_SemitonesChange->GetValue();
      str.ToDouble(&newDouble);
		m_SemitonesChange = newDouble;
	}


	// from/to frequency controls
   if (m_pTextCtrl_FromFrequency) {
      str = m_pTextCtrl_FromFrequency->GetValue();
      str.ToDouble(&newDouble);
		m_FromFrequency = newDouble;
	}

   if (m_pTextCtrl_ToFrequency) {
      str = m_pTextCtrl_ToFrequency->GetValue();
      str.ToDouble(&newDouble);
		m_ToFrequency = newDouble;
	}


	// percent change controls
   if (m_pTextCtrl_PercentChange) {
      str = m_pTextCtrl_PercentChange->GetValue();
      str.ToDouble(&newDouble);
		m_PercentChange = newDouble;
	}

	// Ignore Slider_PercentChange because TextCtrl_PercentChange 
	// always tracks it & is more precise (decimal points).


   return true;
}


// calculations

void ChangePitchDialog::Calc_ToFrequency()
{
	m_ToFrequency = (m_FromFrequency * (100.0 + m_PercentChange)) / 100.0;
}

void ChangePitchDialog::Calc_ToPitchIndex()
{
	m_ToPitchIndex = (m_FromPitchIndex + 
							(int)(m_SemitonesChange + 
									// Round in the right direction.
									((m_bWantPitchDown ? -1.0 : 1.0) * 0.5))) 
							% 12;
}

void ChangePitchDialog::Calc_SemitonesChange_fromPitches()
{
	int sign = m_bWantPitchDown ? -1 : 1;
	m_SemitonesChange = sign * (((sign * (m_ToPitchIndex - m_FromPitchIndex)) + 12) % 12); 
}

void ChangePitchDialog::Calc_SemitonesChange_fromPercentChange()
{
	// Use m_PercentChange rather than m_FromFrequency & m_ToFrequency, because 
	// they start out uninitialized, but m_PercentChange is always valid.
	m_SemitonesChange = (12.0 * log((100.0 + m_PercentChange) / 100.0)) / log(2.0);
}

void ChangePitchDialog::Calc_PercentChange()
{
	m_PercentChange = 100.0 * (pow(2.0, (m_SemitonesChange / 12.0)) - 1.0);
}


// handlers

void ChangePitchDialog::OnChoice_FromPitch(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

   if (m_pChoice_FromPitch) {
		m_FromPitchIndex = m_pChoice_FromPitch->GetSelection();

		this->Calc_ToPitchIndex();

		m_bLoopDetect = true;
		this->Update_Choice_ToPitch();
		m_bLoopDetect = false;
   }
}

void ChangePitchDialog::OnRadioBox_PitchUpDown(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

	if (m_pRadioBox_PitchUpDown) {
		m_bWantPitchDown = (m_pRadioBox_PitchUpDown->GetSelection() == 1);

		this->Calc_SemitonesChange_fromPitches();
		this->Calc_PercentChange(); // Call *after* m_SemitonesChange is updated.
		this->Calc_ToFrequency(); // Call *after* m_PercentChange is updated.

		m_bLoopDetect = true;
		this->Update_Text_SemitonesChange();
		this->Update_Text_ToFrequency();
		this->Update_Text_PercentChange();
		this->Update_Slider_PercentChange();
		m_bLoopDetect = false;
	}
}

void ChangePitchDialog::OnChoice_ToPitch(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

   if (m_pChoice_ToPitch) {
		m_ToPitchIndex = m_pChoice_ToPitch->GetSelection();

		this->Calc_SemitonesChange_fromPitches();
		this->Calc_PercentChange(); // Call *after* m_SemitonesChange is updated.
		this->Calc_ToFrequency(); // Call *after* m_PercentChange is updated.

		m_bLoopDetect = true;
		this->Update_Text_SemitonesChange();
		this->Update_Text_ToFrequency();
		this->Update_Text_PercentChange();
		this->Update_Slider_PercentChange();
		m_bLoopDetect = false;
   }
}

void ChangePitchDialog::OnText_SemitonesChange(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

	if (m_pTextCtrl_SemitonesChange) {
		wxString str = m_pTextCtrl_SemitonesChange->GetValue();
      double newValue = 0;
      str.ToDouble(&newValue);
		m_SemitonesChange = newValue;

		this->Calc_PercentChange();
		this->Calc_ToFrequency(); // Call *after* m_PercentChange is updated.
		m_bWantPitchDown = (m_ToFrequency < m_FromFrequency);
		this->Calc_ToPitchIndex(); // Call *after* m_bWantPitchDown is updated.

		m_bLoopDetect = true;
		this->Update_RadioBox_PitchUpDown();
		if (m_pTextCtrl_SemitonesChange->IsModified())
			// See note at implementation of Update_RadioBox_PitchUpDown.
			m_pTextCtrl_SemitonesChange->SetFocus(); 
		this->Update_Choice_ToPitch();
		this->Update_Text_ToFrequency();
		this->Update_Text_PercentChange();
		this->Update_Slider_PercentChange();
		m_bLoopDetect = false;
	}
}

void ChangePitchDialog::OnText_FromFrequency(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

	if (m_pTextCtrl_FromFrequency) {
		wxString str = m_pTextCtrl_FromFrequency->GetValue();
		double newDouble;
      str.ToDouble(&newDouble);
		m_FromFrequency = newDouble;

		m_FromPitchIndex = PitchIndex(Freq2Pitch(m_FromFrequency));
		this->Calc_ToFrequency();
		m_bWantPitchDown = (m_ToFrequency < m_FromFrequency);
		this->Calc_ToPitchIndex(); // Call *after* m_bWantPitchDown is updated.

		m_bLoopDetect = true;
		this->Update_RadioBox_PitchUpDown();
		if (m_pTextCtrl_FromFrequency->IsModified())
			// See note at implementation of Update_RadioBox_PitchUpDown.
			m_pTextCtrl_FromFrequency->SetFocus(); 
		this->Update_Choice_ToPitch();
		this->Update_Text_ToFrequency();
		m_bLoopDetect = false;
	}
}

void ChangePitchDialog::OnText_ToFrequency(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

   if (m_pTextCtrl_ToFrequency) {
      wxString str = m_pTextCtrl_ToFrequency->GetValue();
		double newDouble;
      str.ToDouble(&newDouble);
		m_ToFrequency = newDouble;

		m_PercentChange = (((double)(m_ToFrequency) * 100.0) / 
									(double)(m_FromFrequency)) - 100.0;

		this->Calc_SemitonesChange_fromPercentChange();
		this->Calc_ToPitchIndex(); // Call *after* m_SemitonesChange is updated.
		m_bWantPitchDown = (m_ToFrequency < m_FromFrequency);

		m_bLoopDetect = true;
		this->Update_RadioBox_PitchUpDown();
		if (m_pTextCtrl_ToFrequency->IsModified())
			// See note at implementation of Update_RadioBox_PitchUpDown.
			m_pTextCtrl_ToFrequency->SetFocus(); 
		this->Update_Choice_ToPitch();
		this->Update_Text_SemitonesChange();
		this->Update_Text_PercentChange();
		this->Update_Slider_PercentChange();
		m_bLoopDetect = false;
   }
}

void ChangePitchDialog::OnText_PercentChange(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

   if (m_pTextCtrl_PercentChange) {
      wxString str = m_pTextCtrl_PercentChange->GetValue();
      double newValue = 0;
      str.ToDouble(&newValue);
		m_PercentChange = newValue;

		this->Calc_SemitonesChange_fromPercentChange();
		this->Calc_ToPitchIndex(); // Call *after* m_SemitonesChange is updated.
		this->Calc_ToFrequency();
		m_bWantPitchDown = (m_ToFrequency < m_FromFrequency);

      m_bLoopDetect = true;
		this->Update_RadioBox_PitchUpDown();
		if (m_pTextCtrl_PercentChange->IsModified())
			// See note at implementation of Update_RadioBox_PitchUpDown.
			m_pTextCtrl_PercentChange->SetFocus(); 
		this->Update_Choice_ToPitch();
		this->Update_Text_SemitonesChange();
		this->Update_Text_ToFrequency();
		this->Update_Slider_PercentChange();
      m_bLoopDetect = false;

      //v Probably better to override wxTextValidator to disallow negative values.
      // See comment in ChangePitchDialog::ChangePitchDialog.
      this->FindWindow(wxID_OK)->Enable(m_PercentChange > -100.0);
   }
}

void ChangePitchDialog::OnSlider_PercentChange(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

	if (m_pSlider_PercentChange) {
		m_PercentChange = (double)(m_pSlider_PercentChange->GetValue()); 
		// Warp positive values to actually go up faster & further than negatives.
		if (m_PercentChange > 0.0)
			m_PercentChange = pow(m_PercentChange, PERCENTCHANGE_SLIDER_WARP);

		this->Calc_SemitonesChange_fromPercentChange();
		this->Calc_ToPitchIndex(); // Call *after* m_SemitonesChange is updated.
		this->Calc_ToFrequency();
		m_bWantPitchDown = (m_ToFrequency < m_FromFrequency);

		m_bLoopDetect = true;
		this->Update_RadioBox_PitchUpDown();
		this->Update_Choice_ToPitch();
		this->Update_Text_SemitonesChange();
		this->Update_Text_ToFrequency();
		this->Update_Text_PercentChange();
	   m_bLoopDetect = false;
	}
}


void ChangePitchDialog::OnPreview(wxCommandEvent &event)
{
   TransferDataFromWindow();

	// Save & restore parameters around Preview, because we didn't do OK.
	double oldSemitonesChange = m_SemitonesChange;
	m_pEffect->m_SemitonesChange = m_SemitonesChange;
	m_pEffect->Preview();
	m_pEffect->m_SemitonesChange = oldSemitonesChange;
}

void ChangePitchDialog::OnOk(wxCommandEvent & event)
{
   TransferDataFromWindow();
   
   if (Validate()) 
      EndModal(true);
   else 
      event.Skip();
}

void ChangePitchDialog::OnCancel(wxCommandEvent & event)
{
   EndModal(false);
}


// helper fns

// NOTE: wxWindows ref (C:\wxWindows_2.4.0\docs\htmlhelp) says 
// wxRadioBox::SetSelection "does not cause a 
// wxEVT_COMMAND_RADIOBOX_SELECTED event to get emitted", but it 
// calls SetFocus, which sure as heck DOES select the radio button.
//
// So, any wxTextCtrl handler that calls Update_RadioBox_PitchUpDown 
// needs to call wxTextCtrl::SetFocus afterward, to return the 
// focus to the wxTextCtrl so the user can keep typing.
//
// Also, it turns out the wxTextCtrl handlers are sometimes 
// called before the dialog is displayed, so those SetFocus calls 
// need to be conditionalized on wxTextCtrl::IsModified.
void ChangePitchDialog::Update_RadioBox_PitchUpDown() 
{
	if (m_pRadioBox_PitchUpDown)
		m_pRadioBox_PitchUpDown->SetSelection((int)(m_bWantPitchDown));
}

void ChangePitchDialog::Update_Choice_ToPitch() 
{
	if (m_pChoice_ToPitch) 
		m_pChoice_ToPitch->SetSelection(m_ToPitchIndex);
}


void ChangePitchDialog::Update_Text_SemitonesChange()
{
	if (m_pTextCtrl_SemitonesChange) {
		wxString str;
		str.Printf(wxT("%.2f"), m_SemitonesChange);
		m_pTextCtrl_SemitonesChange->SetValue(str);
	}
}

void ChangePitchDialog::Update_Text_ToFrequency() 
{
	if (m_pTextCtrl_ToFrequency) {
		wxString str;
		if (m_ToFrequency > 0.0)
			str.Printf(wxT("%.3f"), m_ToFrequency);
		else
			str = wxT("");
		m_pTextCtrl_ToFrequency->SetValue(str);
	}
}


void ChangePitchDialog::Update_Text_PercentChange()
{
	if (m_pTextCtrl_PercentChange) {
		wxString str;
		str.Printf(wxT("%.3f"), m_PercentChange);
		m_pTextCtrl_PercentChange->SetValue(str);
	}
}

void ChangePitchDialog::Update_Slider_PercentChange()
{
   if (m_pSlider_PercentChange) {
		double unwarped = m_PercentChange;
		if (unwarped > 0.0)
			// Un-warp values above zero to actually go up to PERCENTCHANGE_MAX.
			unwarped = pow(m_PercentChange, (1.0 / PERCENTCHANGE_SLIDER_WARP));

		// Add 0.5 to unwarped so trunc -> round.
		m_pSlider_PercentChange->SetValue((int)(unwarped + 0.5)); 
	}
}


#endif // USE_SOUNDTOUCH

// Indentation settings for Vim and Emacs and unique identifier for Arch, a
// version control system. Please do not modify past this point.
//
// Local Variables:
// c-basic-offset: 3
// indent-tabs-mode: nil
// End:
//
// vim: et sts=3 sw=3
// arch-tag: 0b070f91-579c-4b57-bc29-82ceb6775355