function varargout = Phasors(varargin)
   % PHASORS M-file for Phasors.fig
   %      PHASORS, by itself, creates a new PHASORS or raises the existing
   %      singleton*.
   %
   %      H = PHASORS returns the handle to a new PHASORS or the handle to
   %      the existing singleton*.
   %
   %      PHASORS('CALLBACK',hObject,eventData,handles,...) calls the local
   %      function named CALLBACK in PHASORS.M with the given input arguments.
   %
   %      PHASORS('Property','Value',...) creates a new PHASORS or raises the
   %      existing singleton*.  Starting from the left, property value pairs are
   %      applied to the GUI before Phasors_OpeningFunction gets called.  An
   %      unrecognized property name or invalid value makes property application
   %      stop.  All inputs are passed to Phasors_OpeningFcn via varargin.
   %
   %      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
   %      instance to run (singleton)".
   %
   % See also: GUIDE, GUIDATA, GUIHANDLES

   % Edit the above text to modify the response to help Phasors

   % Last Modified by GUIDE v2.5 07-Nov-2006 12:27:16

   % Begin initialization code - DO NOT EDIT
   gui_Singleton = 1;
   gui_State = struct('gui_Name',       mfilename, ...
      'gui_Singleton',  gui_Singleton, ...
      'gui_OpeningFcn', @Phasors_OpeningFcn, ...
      'gui_OutputFcn',  @Phasors_OutputFcn, ...
      'gui_LayoutFcn',  [] , ...
      'gui_Callback',   []);
   if nargin & isstr(varargin{1})
      gui_State.gui_Callback = str2func(varargin{1});
   end

   if nargout
      [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
   else
      gui_mainfcn(gui_State, varargin{:});
   end
   % End initialization code - DO NOT EDIT


   % --- Executes just before Phasors is made visible.
function Phasors_OpeningFcn(hObject, eventdata, handles, varargin)
   % This function has no output args, see OutputFcn.
   % hObject    handle to figure
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)
   % varargin   command line arguments to Phasors (see VARARGIN)

   % Choose default command line output for Phasors
   handles.output = hObject;

   % Update handles structure
   guidata(hObject, handles);
   DrawStatic(handles);
   set(handles.PauseToggle,'Value',get(handles.PauseToggle,'Min'));
   set(handles.PauseToggle,'String','Pause');
   set(handles.HaltToggle,'Value',get(handles.HaltToggle,'Min'));
   axes(handles.RotatingPhasor);
   cla;
   axes(handles.TimePhasor);
   cla;



   % UIWAIT makes Phasors wait for user response (see UIRESUME)
   % uiwait(handles.PhasorView);


   % --- Outputs from this function are returned to the command line.
function varargout = Phasors_OutputFcn(hObject, eventdata, handles)
   % varargout  cell array for returning output args (see VARARGOUT);
   % hObject    handle to figure
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)

   % Get default command line output from handles structure
   varargout{1} = handles.output;


   % --- Executes during object creation, after setting all properties.
function Frequency_CreateFcn(hObject, eventdata, handles)
   % hObject    handle to Frequency (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    empty - handles not created until after all CreateFcns called

   % Hint: edit controls usually have a white background on Windows.
   %       See ISPC and COMPUTER.
   if ispc
      set(hObject,'BackgroundColor','white');
   else
      set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
   end


function Frequency_Callback(hObject, eventdata, handles)
   % hObject    handle to Frequency (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)

   % Hints: get(hObject,'String') returns contents of Frequency as text
   %        str2double(get(hObject,'String')) returns contents of Frequency as a double
   x= str2double(get(hObject,'String'));
   if ((x<0.1) | (x>1)),
      warndlg('Frequency of phasor must be between 0.1 and 1.  Frequency set to 0.5','Input Error')
      set(hObject,'String','0.5');
   end


   % --- Executes on button press in halt.
function halt_Callback(hObject, eventdata, handles)
   % hObject    handle to halt (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)


   % --- Executes on button press in Halt.
function Halt_Callback(hObject, eventdata, handles)
   % hObject    handle to Halt (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)
   handles.DoHalt=1;
   guidata(handles.PhasorView, handles);  %save changes to handles.


   % --- Executes on button press in WebButton.
function WebButton_Callback(hObject, eventdata, handles)
   % hObject    handle to WebButton (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)
   web('http://www.swarthmore.edu/NatSci/echeeve1/Ref/phasors/phasors.html','-browser')


   % --- Executes during object creation, after setting all properties.
function ZPhase_CreateFcn(hObject, eventdata, handles)
   % hObject    handle to ZPhase (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    empty - handles not created until after all CreateFcns called

   % Hint: edit controls usually have a white background on Windows.
   %       See ISPC and COMPUTER.
   if ispc
      set(hObject,'BackgroundColor','white');
   else
      set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
   end



function ZPhase_Callback(hObject, eventdata, handles)
   % hObject    handle to ZPhase (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)

   % Hints: get(hObject,'String') returns contents of ZPhase as text
   %        str2double(get(hObject,'String')) returns contents of ZPhase as a double



   % --- Executes during object creation, after setting all properties.
function IPhase_CreateFcn(hObject, eventdata, handles)
   % hObject    handle to IPhase (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    empty - handles not created until after all CreateFcns called

   % Hint: edit controls usually have a white background on Windows.
   %       See ISPC and COMPUTER.
   if ispc
      set(hObject,'BackgroundColor','white');
   else
      set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
   end



function IPhase_Callback(hObject, eventdata, handles)
   % hObject    handle to IPhase (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)

   % Hints: get(hObject,'String') returns contents of IPhase as text
   %        str2double(get(hObject,'String')) returns contents of IPhase as a double

   % --- Executes during object creation, after setting all properties.
function VPhase_CreateFcn(hObject, eventdata, handles)
   % hObject    handle to VPhase (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    empty - handles not created until after all CreateFcns called

   % Hint: edit controls usually have a white background on Windows.
   %       See ISPC and COMPUTER.
   if ispc
      set(hObject,'BackgroundColor','white');
   else
      set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
   end



function VPhase_Callback(hObject, eventdata, handles)
   % hObject    handle to VPhase (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)

   % Hints: get(hObject,'String') returns contents of VPhase as text
   %        str2double(get(hObject,'String')) returns contents of VPhase as a double


   % --- Executes during object creation, after setting all properties.
function VMag_CreateFcn(hObject, eventdata, handles)
   % hObject    handle to VMag (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    empty - handles not created until after all CreateFcns called

   % Hint: edit controls usually have a white background on Windows.
   %       See ISPC and COMPUTER.
   if ispc
      set(hObject,'BackgroundColor','white');
   else
      set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
   end



function VMag_Callback(hObject, eventdata, handles)
   % hObject    handle to VMag (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)

   % Hints: get(hObject,'String') returns contents of VMag as text
   %        str2double(get(hObject,'String')) returns contents of VMag as a double
   x= str2double(get(hObject,'String'));
   if (x==0),
      warndlg('Amplitude of phasor may not be zero.  Amplitude set to 1.0','Input Error')
      set(hObject,'String','1.0');
   end



   % --- Executes during object creation, after setting all properties.
function IMag_CreateFcn(hObject, eventdata, handles)
   % hObject    handle to IMag (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    empty - handles not created until after all CreateFcns called

   % Hint: edit controls usually have a white background on Windows.
   %       See ISPC and COMPUTER.
   if ispc
      set(hObject,'BackgroundColor','white');
   else
      set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
   end



function IMag_Callback(hObject, eventdata, handles)
   % hObject    handle to IMag (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)

   % Hints: get(hObject,'String') returns contents of IMag as text
   %        str2double(get(hObject,'String')) returns contents of IMag as a double
   x= str2double(get(hObject,'String'));
   if (x==0),
      warndlg('Amplitude of phasor may not be zero.  Amplitude set to 1.0','Input Error')
      set(hObject,'String','1.0');
   end


   % --- Executes during object creation, after setting all properties.
function ZMag_CreateFcn(hObject, eventdata, handles)
   % hObject    handle to ZMag (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    empty - handles not created until after all CreateFcns called

   % Hint: edit controls usually have a white background on Windows.
   %       See ISPC and COMPUTER.
   if ispc
      set(hObject,'BackgroundColor','white');
   else
      set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
   end
   x= str2double(get(hObject,'String'));
   if (x==0),
      warndlg('Amplitude of phasor may not be zero.  Amplitude set to 1.0','Input Error')
      set(hObject,'String','1.0');
   end



function ZMag_Callback(hObject, eventdata, handles)
   % hObject    handle to ZMag (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)

   % Hints: get(hObject,'String') returns contents of ZMag as text
   %        str2double(get(hObject,'String')) returns contents of ZMag as a double


   % --- Executes on button press in CalcI.
function CalcI_Callback(hObject, eventdata, handles)
   % hObject    handle to CalcI (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)
   VMag=str2double(get(handles.VMag,'String'));
   VPhase=str2double(get(handles.VPhase,'String'));
   ZMag=str2double(get(handles.ZMag,'String'));
   ZPhase=str2double(get(handles.ZPhase,'String'));
   IMag=VMag/ZMag;
   IPhase=VPhase-ZPhase;
   set(handles.IMag,'String',num2str(IMag));
   set(handles.IPhase,'String',num2str(IPhase));
   DrawStatic(handles);


   % --- Executes on button press in CalcZ.
function CalcZ_Callback(hObject, eventdata, handles)
   % hObject    handle to CalcZ (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)
   IMag=str2double(get(handles.IMag,'String'));
   IPhase=str2double(get(handles.IPhase,'String'));
   VMag=str2double(get(handles.VMag,'String'));
   VPhase=str2double(get(handles.VPhase,'String'));
   ZMag=VMag/IMag;
   ZPhase=VPhase-IPhase;
   set(handles.ZMag,'String',num2str(ZMag));
   set(handles.ZPhase,'String',num2str(ZPhase));
   DrawStatic(handles);

   % --- Executes on button press in CalcV.
function CalcV_Callback(hObject, eventdata, handles)
   % hObject    handle to CalcV (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)
   IMag=str2double(get(handles.IMag,'String'));
   IPhase=str2double(get(handles.IPhase,'String'));
   ZMag=str2double(get(handles.ZMag,'String'));
   ZPhase=str2double(get(handles.ZPhase,'String'));
   VMag=IMag*ZMag;
   VPhase=IPhase+ZPhase;
   set(handles.VMag,'String',num2str(VMag));
   set(handles.VPhase,'String',num2str(VPhase));
   DrawStatic(handles);

function DrawStatic(handles);
   IMag=str2double(get(handles.IMag,'String'));
   IPhase=str2double(get(handles.IPhase,'String'))*pi/180;
   ZMag=str2double(get(handles.ZMag,'String'));
   ZPhase=str2double(get(handles.ZPhase,'String'))*pi/180;
   VMag=str2double(get(handles.VMag,'String'));
   VPhase=str2double(get(handles.VPhase,'String'))*pi/180;
   axes(handles.StaticPhasor);
   cla;
   Gmax=max(max(VMag,ZMag),IMag);
   axis(Gmax*[-1 1 -1 1]);
   plotArrow(IMag,IPhase,'b');
   plotArrow(ZMag,ZPhase,'m');
   plotArrow(VMag,VPhase,'r');
   axes(handles.RotatingPhasor);
   cla;
   axes(handles.TimePhasor);
   cla;

   %Draw an Arrowhead and a small circle to show the x-axis intercept).
function plotArrow(A,phi,c)
   hold on
   %Define Arrow.
   x=[0 A A-0.2 A A-0.2]';
   y=[0 0 0.2 0 -0.2]';
   %Rotate Arrow.
   x1=x*cos(phi)-y*sin(phi);
   y1=x*sin(phi)+y*cos(phi);
   %Plot Arrow.
   plot(x1,y1,c,'LineWidth',2)

   if c~='m',  %Don't draw circle for impedance (magenta)
      %Define small circle and plot it on x axis.
      theta=0:pi/4:2*pi;
      xp=A*cos(phi)+0.1*cos(theta);
      yp=0.1*sin(theta);
      fill(xp,yp,c,'EdgeColor',c);
   end
   %Draw dotted circle to show magnitude of error.
   theta=0:0.1:2*pi;
   plot(A*cos(theta),A*sin(theta),strvcat(c,':'));


function DrawRotating(handles)
   IMag=str2double(get(handles.IMag,'String'));
   IPhase=str2double(get(handles.IPhase,'String'))*pi/180;
   VMag=str2double(get(handles.VMag,'String'));
   VPhase=str2double(get(handles.VPhase,'String'))*pi/180;
   ZMag=str2double(get(handles.ZMag,'String'));        %ZMag is needed below for scaling figure.

   f=str2double(get(handles.Frequency,'String'));
   omega=2*pi*f;

   t=0:0.1:10;
   %t=0:1:10;

   set(handles.PauseToggle,'Value',get(handles.PauseToggle,'Min'));
   set(handles.PauseToggle,'String','Pause');

   theta=0:pi/4:2*pi;
   for i=1:length(t),
      axes(handles.RotatingPhasor);
      cla;
      grid on;
      Gmax=max(max(VMag,ZMag),IMag);
      axis(Gmax*[-1 1 -1 1]);

      plotArrow(IMag,IPhase+omega*t(i),'b');
      plotArrow(VMag,VPhase+omega*t(i),'r');
      TimeHandle=text(-0.8*Gmax, 0.8*Gmax, sprintf('t=%g  ',t(i)));
      set(TimeHandle,'BackGroundColor','White')

      axes(handles.TimePhasor);
      cla;
      grid on;
      hold on;
      axis([0 10 -Gmax Gmax]);
      x=t(1:i);
      y=IMag*cos(IPhase+omega*x);
      plot(x,y,'b');
      xp=x(end)+0.03*Gmax*cos(theta);
      yp=y(end)+0.04*Gmax*sin(theta);
      fill(xp,yp,'b','EdgeColor','b');
      y=VMag*cos(VPhase+omega*x);
      plot(x,y,'r');
      xp=x(end)+0.03*Gmax*cos(theta);
      yp=y(end)+0.04*Gmax*sin(theta);
      fill(xp,yp,'r','EdgeColor','r');
      xlabel('Time');
      ylabel('Function value');
      handles=guidata(handles.PhasorView);  %Reload handles (may change on halt or pause button).
      while (get(handles.PauseToggle,'Value')==get(handles.PauseToggle,'Max')),
         pause(0.2);
         if (get(handles.HaltToggle,'Value')==get(handles.HaltToggle,'Max')),
            break
         end
      end
      if (get(handles.HaltToggle,'Value')==get(handles.HaltToggle,'Max')),
         break
      end

      %M(i)=getframe(gcf);
      pause(0.05);
   end

   set(handles.HaltToggle,'Value',get(handles.HaltToggle,'Min'));
   set(handles.PauseToggle,'Value',get(handles.PauseToggle,'Min'));
   set(handles.PauseToggle,'String','Pause');

   %movie(gcf,M)
   %save M
   %movie2avi(M,'x.avi','compression','indeo5','quality',100,'fps',5)


   % --- Executes on button press in PauseToggle.
function PauseToggle_Callback(hObject, eventdata, handles)
   % hObject    handle to PauseToggle (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)

   % Hint: get(hObject,'Value') returns toggle state of PauseToggle
   % --- Executes on button press in PauseButton.
   beep
   if (get(handles.PauseToggle,'Value')==get(handles.PauseToggle,'Max')),
      set(handles.PauseToggle,'String','Continue');
   else
      set(handles.PauseToggle,'String','Pause');
   end


   % --- Executes on button press in HaltToggle.
function HaltToggle_Callback(hObject, eventdata, handles)
   % hObject    handle to HaltToggle (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)

   % Hint: get(hObject,'Value') returns toggle state of HaltToggle


   % --- Executes on button press in GoButton.
function GoButton_Callback(hObject, eventdata, handles)
   % hObject    handle to GoButton (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)
   DrawRotating(handles);