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希望任何人都可以帮助我。

我尝试在我的 GUI 中加载和显示图像。之后我激活datacursormode。现在我想从我的数据游标对象中提取位置并将信息保存到全局变量中以处理这些数据。

这是我的代码:

function varargout = myGui(varargin)

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
               'gui_Singleton',  gui_Singleton, ...
               'gui_OpeningFcn', @myGui_OpeningFcn, ...
               'gui_OutputFcn',  @myGui_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 myGui is made visible.

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

path = uigetimagefile;
img = imread(path);

axes(handles.axes1);

imshow(img);

dcm_obj = datacursormode(handles.figure1);
datacursormode on;
set(dcm_obj,'UpdateFcn', @myupdatefcn );


handles.pos = hObject;
handles.pos = get(0,'userdata');
set(handles.txt1,'String',num2str(handles.pos));
guidata(hObject, handles);


% --- Outputs from this function are returned to the command line.
function varargout = myGui_OutputFcn(hObject, eventdata, handles) 

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

在一个额外的 .m 文件中,我有像这样的“myupdatefcn”

function txt = myupdatefcn(~, event_obj)
posi = event_obj.Position;
disp(['You clicked X:',num2str(posi(1)),', Y:',num2str(posi(2))]);
txt = {'Point to Compute'};
set(0,'userdata',posi(1));
end

谁能解释我如何做到这一点?

谢谢

4

1 回答 1

0

你的GUI组织似乎有点混乱。您必须小心在.mGUIDE 生成的文件中放置额外代码的位置。

我建议你通过调用你自己的初始化函数来替换你放在函数中间的所有代码:

myGuiInitialization(handles) ;

然后,在同一个文件(在底部)中,添加以下代码:

function myGuiInitialization(handles)
% path = uigetimagefile;       %// uncomment that to retrieve your intital functionality
% img = imread(path);          %// uncomment that to retrieve your intital functionality
img = imread('peppers.png') ;  %// Delete that to retrieve your intital functionality

himg = imshow(img, 'Parent',handles.axes1) ;    %// get the handle of the image graphic object (needed to attach the datatip to it)

dcm_obj  = datacursormode(handles.figure1);     %// get the handle of the datacursor object
set(dcm_obj,'UpdateFcn', @myDatatipUpdateFcn ); %// assign it a callback
dcm_obj.createDatatip(himg) ;                   %// create a new DATATIP and attach it to the image object

这将加载图像,创建数据提示并将回调关联到它。

您管理数据提示更新的单独功能变为:

function txt = myDatatipUpdateFcn(hobj, event_obj)

   handles = guidata( event_obj.Target ) ;  %// retrieve the collection of GUI graphic object handles
   pointPosition = event_obj.Position;      %// get the position of the datatip

   %// Store the position in the figure "appdata", named "pointPosition"
   setappdata( handles.figure1 , 'pointPosition' , pointPosition )  

   %// now we've saved the position in the appdata, you can also display it
   %// on the datatip itself
   txt = {'Point to Compute: ';...
         ['X:',num2str(pointPosition(1))]; ...
         ['Y:',num2str(pointPosition(2))] } ;

现在每次移动数据提示时,最后一个点的位置都会保存在图AppData中。我建议您使用该功能setappdatagetappdata而不是旧的userdata(这是过去的事情,如果可以的话,请避免使用它)。

特别是,您不推荐分配userdata对象0的方式,因为它将存储在主根对象中。如果您关闭您的 gui,这些数据可能仍然存在。将setappdata存储附加到您的 GUI的数据,这是一种更清洁的方式(当您的 gui 关闭时,数据会随着您的 gui 消失)。

现在,当您想对保存在 AppData 中的点位置进行操作时,只需使用getappdata.

出于本示例的目的,我在图中创建了一个按钮。按下时,它将检索点位置并将其显示在文本框中。

创建按钮时,GUIDE 将在 gui 主函数中为其创建一个空回调。将以下代码放入其中:

% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)

%// retrieve the point position saved in the figure appdata named "pointPosition"
pointPosition = getappdata( handles.figure1 , 'pointPosition' ) ;
%// that's it, you have your point position, now do whatever you need with it

%// prepare a test string with the position and display it in the label
txtstr = sprintf('Point to compute: X=%d , Y=%d',pointPosition) ;
set(handles.txt1,'String',txtstr);

这段代码将产生类似的东西: 样本gui

数据提示标签将在每次移动时更新位置,但底部的文本标签仅在您按下按钮时才会更新。

于 2015-01-17T19:58:22.780 回答