Matlab GUI轴从数据光标提取位置
希望有人能帮助我 我尝试在GUI中加载和显示图像。 之后,我激活datacursormode。现在,我想从datacursor对象中提取位置,并将信息保存到一个全局变量中,以处理该数据 这是我的密码:Matlab GUI轴从数据光标提取位置,matlab,user-interface,matlab-guide,axes,imshow,Matlab,User Interface,Matlab Guide,Axes,Imshow,希望有人能帮助我 我尝试在GUI中加载和显示图像。 之后,我激活datacursormode。现在,我想从datacursor对象中提取位置,并将信息保存到一个全局变量中,以处理该数据 这是我的密码: function varargout = myGui(varargin) % Begin initialization code - DO NOT EDIT gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ..
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,我有一个类似于
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
有人能解释一下我是怎么做到的吗
谢谢您的GUI组织似乎有点混乱。您必须小心在指南生成的
.m
文件中放置额外代码的位置
我建议您通过调用您自己的初始化函数来替换您在函数中间放置的所有代码:
myGuiInitialization(handles) ;
然后,在同一文件(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
这将加载一个图像,创建一个数据提示,并将回调与之关联
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,最后一个点位置都将保存在figure AppData中。我建议您使用该函数,而不是旧的userdata
(这已经成为过去,如果可以,请避免使用)
特别是,我们不建议您以这种方式分配对象0
的userdata
,因为这将存储在主根对象中。如果关闭gui,这些数据可能仍然存在。setappdata
将存储附加到GUI的数据,这是一种更干净的方式(当GUI关闭时,数据将随GUI一起消失)
现在,当您想对保存在AppData中的点位置执行某些操作时,您可以使用getappdata
检索它们
在本例中,我在图形上创建了一个按钮。按下按钮后,它将检索点位置并在文本框中显示
创建按钮时,指南将在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);
此代码将生成如下内容:
每次移动时,数据提示标签都会更新位置,但底部的文本标签只有在按下按钮时才会更新。我解释了如何在中以及中进行更新。如果您看到第二个答案,请直接转到“第2章:按程序导出”。谢谢您的帮助。我觉得有点不同。现在它工作了一半。我在发布之前编辑我的帖子,以显示我的新实现。我的实际问题是gui不更新。是否要“检测图像上的点击”,然后报告位置或创建数据光标,让用户定位,然后报告位置?第二个。创建一个datacursor,让用户定位它,然后报告该位置或将该位置保存在变量中以处理它