让我们考虑使用图形用户界面的程序
function varargout = quadratic(varargin)
% QUADRATIC MATLAB code for quadratic.fig
% QUADRATIC, by itself, creates a new QUADRATIC or raises the existing
% singleton*.
%
% H = QUADRATIC returns the handle to a new QUADRATIC or the handle to
% the existing singleton*.
%
% QUADRATIC('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in QUADRATIC.M with the given input arguments.
%
% QUADRATIC('Property','Value',...) creates a new QUADRATIC or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before quadratic_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to quadratic_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 quadratic
% Last Modified by GUIDE v2.5 23-Jul-2014 18:00:48
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @quadratic_OpeningFcn, ...
'gui_OutputFcn', @quadratic_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 quadratic is made visible.
function quadratic_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 quadratic (see VARARGIN)
% Choose default command line output for quadratic
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes quadratic wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = quadratic_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 button press in edit1.
function edit1_Callback(hObject, eventdata, handles)
% hObject handle to edit1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% --- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
% hObject handle to edit1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
function b_Callback(hObject, eventdata, handles)
% hObject handle to b (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 b as text
% str2double(get(hObject,'String')) returns contents of b as a double
% --- Executes during object creation, after setting all properties.
function b_CreateFcn(hObject, eventdata, handles)
% hObject handle to b (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 && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function c_Callback(hObject, eventdata, handles)
% hObject handle to c (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 c as text
% str2double(get(hObject,'String')) returns contents of c as a double
% --- Executes during object creation, after setting all properties.
function c_CreateFcn(hObject, eventdata, handles)
% hObject handle to c (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 && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
a=str2num(get(handles.a,'String'));
b=str2num(get(handles.b,'String'));
c=str2num(get(handles.c,'String'));
d=b^2-4*a*c;
if (d>0)
X1=(-b+sqrt(d))/(2*a);
X2=(-b-sqrt(d))/(2*a);
set(handles.x1,'String',X1)
set(handles.x2,'String',X2)
elseif (d==0)
X1=(-b+sqrt(d))/(2*a);
set(handles.x1,'String',X1)
set(handles.x2,'String',X1)
else
set(handles.x1,'String','roots are complex')
set(handles.x2,'String','roots are complex')
end
function x1_Callback(hObject, eventdata, handles)
% hObject handle to x1 (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 x1 as text
% str2double(get(hObject,'String')) returns contents of x1 as a double
% --- Executes during object creation, after setting all properties.
function x1_CreateFcn(hObject, eventdata, handles)
% hObject handle to x1 (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 && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function x2_Callback(hObject, eventdata, handles)
% hObject handle to x2 (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 x2 as text
% str2double(get(hObject,'String')) returns contents of x2 as a double
% --- Executes during object creation, after setting all properties.
function x2_CreateFcn(hObject, eventdata, handles)
% hObject handle to x2 (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 && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function a_Callback(hObject, eventdata, handles)
% hObject handle to a (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 a as text
% str2double(get(hObject,'String')) returns contents of a as a double
% --- Executes during object creation, after setting all properties.
function a_CreateFcn(hObject, eventdata, handles)
% hObject handle to a (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 && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
这个程序简单将允许输入二次方程的系数然后求解方程并尝试找到根，如何在此程序之后截取GUI界面的截图？请帮助我，我想保存运行后出现的数字这个节目，提前谢谢
答案 0 :(得分：3)
快速而肮脏的方法之一
myGUI = quadratic;
% ......
% do something or wait until it's done...
% ......
print(myGUI, '-dpng', 'GUIOUT.png'); % save as .png
print(myGUI, '-djpeg', 'GUIOUT.jpg'); % save as .jpg
如果您只截取屏幕截图，它会正常工作。
但是，如果您遇到输出图片与屏幕上的图形大小不同的问题（特别是在保存为 pdf 时），您可能必须实施描述的解决方案在 this article
甚至更好地使用fig2file可能对您有用。