I'm using GUIDE to create a GUI with a slider. I want to be able to move the slider and it to update the plot on the GUI. I think I need to use a callback function but I am not sure how to do this. My code is below. In the code I want the variable 'theta' to update with the value of the slider and I then want the new theta value to be put in the next coding section where it will run a rotation matrix. To work sucessfully I want the plot to be continuously updated each time I click on the slider.
function varargout = testing123(varargin)% TESTING123 MATLAB code for testing123.fig
% TESTING123, by itself, creates a new TESTING123 or raises the existing
% singleton*.
%
% H = TESTING123 returns the handle to a new TESTING123 or the handle to
% the existing singleton*.
%% TESTING123('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in TESTING123.M with the given input arguments.
%% TESTING123('Property','Value',...) creates a new TESTING123 or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before testing123_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to testing123_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 testing123
% Last Modified by GUIDE v2.5 16-Sep-2013 13:03:42
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @testing123_OpeningFcn, ... 'gui_OutputFcn', @testing123_OutputFcn, ... 'gui_LayoutFcn', [] , ... 'gui_Callback', []);if nargin && ischar(varargin{1}) gui_State.gui_Callback = str2func(varargin{1});endif 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 testing123 is made visible.
function testing123_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 testing123 (see VARARGIN)
% Choose default command line output for testing123
handles.output = hObject;% Update handles structure
guidata(hObject, handles);% UIWAIT makes testing123 wait for user response (see UIRESUME)
%uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = testing123_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)global thetaglobal xglobal y global x_rotated global y_rotatedglobal x_centerglobal y_centertheta= guidata(handles.slider1)x=[1; 2; 3; 4];c=[4; 5; 67; 6];y = c;%close all
% create a matrix of these points, which will be useful in future calculations
v = [x y];% choose a point which will be the center of rotation
x_center = x(1);y_center = y(1);% create a matrix which will be used later in calculations
center = repmat([x_center; y_center], 1, length(x));% define a 60 degree counter-clockwise rotation matrix
R = [cosd(theta) -sind(theta); sind(theta) cosd(theta)];% do the rotation...
%s = v - center; % shift points in the plane so that the center of rotation is at the origin
%so = R*s; % apply the rotation about the origin
%vo = so + center; % shift again so the origin goes back to the desired center of rotation
% this can be done in one line as:
vo = R*((v - center')') + center;% pick out the vectors of rotated x- and y-data
x_rotated = vo(1,:);y_rotated = vo(2,:);% Get default command line output from handles structure
varargout{1} = handles.output;% --- Executes on slider movement.
function slider1_Callback(hObject, eventdata, handles)%global theta
%theta = get(handles.slider1,'Value')
% 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
% --- Executes during object creation, after setting all properties.
function axes1_CreateFcn(hObject, eventdata, handles)% hObject handle to axes1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB% handles empty - handles not created until after all CreateFcns called
% Hint: place code in OpeningFcn to populate axes1
global xglobal y global x_rotated global y_rotatedglobal x_centerglobal y_center% make a plot
subplot(2,1,1)plot(x, y, 'k-', x_rotated, y_rotated, 'r-', x_center, y_center, 'bo');axis equalsubplot(2,1,2)plot(x_rotated,y_rotated)% --- 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
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