function varargout = tripleangle(varargin)
% TRIPLEANGLE Visualize triple angle rotations
%
% TRIPLEANGLE, by itself, displays a simple GUI with three angle sliders
% and a set of axes showing three coordinate frames.  The frames correspond
% to rotation after the first angle (red), the first and second angles (green)
% and all three angles (blue).
%
% TRIPLEANGLE(OPTIONS) as above but with options to select the rotation axes.
%
% Options::
% 'rpy'     Rotation about axes x, y, z (default)
% 'euler'   Rotation about axes z, y, z
% 'ABC'     Rotation about axes A, B, C where A,B,C are each one of x,y or z.
%
% Other options relevant to TRPLOT can be appended.
%
% Notes::
% - All angles are displayed in units of degrees.
%
% See also trplot.



% Last Modified by GUIDE v2.5 26-Jan-2013 15:28:14


% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @tripleangle_OpeningFcn, ...
                   'gui_OutputFcn',  @tripleangle_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(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 tripleang is made visible.
function tripleangle_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 tripleang (see VARARGIN)

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

figure(handles.figure1);

opt.wait = false;
opt.which = {'rpy', 'euler'};

[opt,args] = tb_optparse(opt, varargin);

if length(args) > 0 && ischar(args{1})
    s = args{1};
    try
        set(handles.popupmenu1, 'Value', strfind('xyz', s(1)));
        set(handles.popupmenu2, 'Value', strfind('xyz', s(2)));
        set(handles.popupmenu3, 'Value', strfind('xyz', s(3)));
        if length(args) > 1
            args = args{2:end};
        else
            args = {};
        end
        opt.which = 'none';
    catch me
        % doesnt match a rotation string, go with 'rpy'
        opt.which = 'rpy';
        
    end
end
switch opt.which
    case 'rpy'
        set(handles.popupmenu1, 'Value', 1);
        set(handles.popupmenu2, 'Value', 2);
        set(handles.popupmenu3, 'Value', 3);
    case 'euler'
        set(handles.popupmenu1, 'Value', 3);
        set(handles.popupmenu2, 'Value', 2);
        set(handles.popupmenu3, 'Value', 3);
end
                
% draw the axes
handles.h1 = trplot(eye(3,3), 'color', 'r', args{:});
hold on
handles.h2 = trplot(eye(3,3), 'color', 'g', args{:});
handles.h3 = trplot(eye(3,3), 'color', 'b', 'thick', 2, args{:});

% Update handles structure
guidata(hObject, handles);

% set the initial value of text fields
set(handles.text1, 'String', sprintf('%.1f', get(handles.slider1, 'Value')));
set(handles.text2, 'String', sprintf('%.1f', get(handles.slider2, 'Value')));
set(handles.text3, 'String', sprintf('%.1f', get(handles.slider3, 'Value')));

% UIWAIT makes tripleang wait for user response (see UIRESUME)
if opt.wait
    uiwait(handles.figure1);
end


% --- Outputs from this function are returned to the command line.
function varargout = tripleangle_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 on selection change in popupmenu1.
function popupmenu1_Callback(hObject, eventdata, handles)
% hObject    handle to popupmenu1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = cellstr(get(hObject,'String')) returns popupmenu1 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from popupmenu1


% --- Executes during object creation, after setting all properties.
function popupmenu1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to popupmenu1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

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



% --- Executes on slider movement.
function slider1_Callback(hObject, eventdata, handles)
% hObject    handle to slider1 (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,'Value') returns position of slider
%        get(hObject,'Min') and get(hObject,'Max') to determine range of slider

set(handles.text1, 'String', sprintf('%.1f', get(hObject, 'Value')));
update(handles);

% --- Executes during object creation, after setting all properties.
function slider1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to slider1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background.
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor',[.9 .9 .9]);
end



% --- Executes on slider movement.
function slider2_Callback(hObject, eventdata, handles)
% hObject    handle to slider2 (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,'Value') returns position of slider
%        get(hObject,'Min') and get(hObject,'Max') to determine range of slider

set(handles.text2, 'String', sprintf('%.1f', get(hObject, 'Value')));

update(handles);

% --- Executes during object creation, after setting all properties.
function slider2_CreateFcn(hObject, eventdata, handles)
% hObject    handle to slider2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background.
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor',[.9 .9 .9]);
end


% --- Executes on slider movement.
function slider3_Callback(hObject, eventdata, handles)
% hObject    handle to slider3 (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,'Value') returns position of slider
%        get(hObject,'Min') and get(hObject,'Max') to determine range of slider

set(handles.text3, 'String', sprintf('%.1f', get(hObject, 'Value')));

update(handles);

% --- Executes during object creation, after setting all properties.
function slider3_CreateFcn(hObject, eventdata, handles)
% hObject    handle to slider3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background.
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor',[.9 .9 .9]);
end


% --- Executes on selection change in popupmenu2.
function popupmenu2_Callback(hObject, eventdata, handles)
% hObject    handle to popupmenu2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = cellstr(get(hObject,'String')) returns popupmenu2 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from popupmenu2


% --- Executes during object creation, after setting all properties.
function popupmenu2_CreateFcn(hObject, eventdata, handles)
% hObject    handle to popupmenu2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

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


% --- Executes on selection change in popupmenu3.
function popupmenu3_Callback(hObject, eventdata, handles)
% hObject    handle to popupmenu3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = cellstr(get(hObject,'String')) returns popupmenu3 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from popupmenu3


% --- Executes during object creation, after setting all properties.
function popupmenu3_CreateFcn(hObject, eventdata, handles)
% hObject    handle to popupmenu3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

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

function update(handles)
    
    % compute the three rotation matrices
    
    R1 = Rx( get(handles.slider1, 'Value'), get(handles.popupmenu1, 'Value'));
    R2 = Rx( get(handles.slider2, 'Value'), get(handles.popupmenu2, 'Value'));
    R3 = Rx( get(handles.slider3, 'Value'), get(handles.popupmenu3, 'Value'));


    % display the three frames
    trplot(handles.h1, R1);
    trplot(handles.h2, R1*R2);
    trplot(handles.h3, R1*R2*R3);

    
function R = Rx(theta, which)
        theta = theta * pi/180;

        switch which
            case 1
                R = rotx(theta);
            case 2
                R = roty(theta);
            case 3
                R = rotz(theta);
        end