文章目錄

• 1. 設置背景顏色
• • 1.1 通過GUI按鈕設置背景顏色
  • 1.2 通過GUI運行設置背景顏色
• 2. 錯誤對話框
• • 2.1 “截屏失敗”舉例
• 3. 計算器
• • 按鈕callback
  • +-*/ callback
  • = callback
  • √ callback
  • ← callback
  • C callback
• 4. 退出
• 5. 選擇列表框繪圖
• 6. 取彈出式菜單里的值

1. 設置背景顏色

1.1 通過GUI按鈕設置背景顏色

function backswitch_Callback(hObject, eventdata, handles) % hObject handle to backswitch (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) ha = axes('units','normalized','position',[0 0 1 1]); uistack(ha, 'down') [fname, pname, index] = uigetfile({'*.jpg; *.bmp'},'選擇背景圖片'); if indexII = imread([pname,fname]);image(II)colormap grayset(ha,'handlevisibility','off','visible','off'); elseerrordlg('選擇背景失敗'); %提示錯誤對話框hDialog = findall(0,'tag','Msgbox_Error Dialog');btn_ok = findall(hDialog,'style','pushbutton');set(btn_ok,'String','確定'); end

1.2 通過GUI運行設置背景顏色

% --- Executes just before computesumprice is made visible. function computesumprice_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 computesumprice (see VARARGIN)% Choose default command line output for computesumprice ha = axes('units','normalized','position',[0 0 1 1]); uistack(ha, 'down') % up，down,可選 II = imread('1.jpg'); image(II) colormap gray set(ha,'handlevisibility','off','visible','off');handles.output = hObject; % Update handles structure guidata(hObject, handles);

2. 錯誤對話框

2.1 “截屏失敗”舉例

% --- Executes on button press in screencapture. function screencapture_Callback(hObject, eventdata, handles) % hObject handle to screencapture (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) [fname, ~, index] = uiputfile({'*.jpg'}); if indexa = getframe(computesumprice);%注意不是gcfimwrite(a.cdata,fname); elseerrordlg('導出失敗'); %提示錯誤對話框hDialog = findall(0,'tag','Msgbox_Error Dialog');btn_ok = findall(hDialog,'style','pushbutton');set(btn_ok,'String','確定'); end

3. 計算器

按鈕callback

str_cur = get(handles.display, 'string'); str_cur_val = str2double(get(handles.display, 'string')); current(1) = get(hObject, 'string'); % 判斷初始化是否為0 if str_cur_val == 0set(handles.display,'string',current(1)); elseset(handles.display,'string',[str_cur,current(1)]); end

±*/ callback

str_before = get(handles.display, 'string'); add_str = get(handles.add, 'string'); set(handles.display,'string',[str_before,add_str]);

= callback

equal_sign = get(hObject,'string');%獲取= str_before = get(handles.display, 'string'); %獲取display的字符 answer = eval(str_before);%MATLAB提供的eval函數，可根據字符直接計算，無需格外編寫算法 set(handles.display,'string',strcat(str_before,equal_sign,num2str(answer)));

√ callback

str_before = get(handles.display, 'string'); square_root_str = 'sqrt'; leftk ='('; rightk =')'; set(handles.display,'string',[square_root_str,leftk ,str_before,rightk]);

← callback

textString = get(handles.display,'String'); n=length(textString); t=char(textString); textString=t(1:n-1); set(handles.display,'String',textString)

C callback

set(handles.display , 'string', num2str(0));

4. 退出

h = gcf; close(h);

5. 選擇列表框繪圖

seldata = get(handles.seldata, 'value'); %seldata為列表框tag axes(handles.axes2)switch seldatacase 1plot(t,data1)title('傳聲器1時域數據')case 2plot(t,data2)title('傳聲器2時域數據') otherwisereturn end

6. 取彈出式菜單里的值

winType = get(handles.winType, 'value'); switch winTypecase 1w = hanning(NFFT);case 2w = boxcar(NFFT); case 3w = hamming(NFFT);otherwisereturn end

總結

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