MATLAB GUI:移动绘图点时更新文本框 [英] MATLAB GUI: Update textbox when moving drawpoint
问题描述
我有一个GUI，用户可以在其中单击按钮放置一个点(drawpoint).放置该点后，将计算出它与先前选择的静态点之间的欧几里得距离.
I have a GUI where the user clicks a button to place a point (drawpoint). After placing the point, the Euclidean distance is calculated between it and a static point chosen prior.
我希望能够移动按钮创建的点；这样，在移动该点之后，便重新计算了欧几里得距离并将其吐到文本框中.
I want to be able to move point created by the pushbutton; such that, after moving the point the Euclidean distance is recalculated and spit into a textbox.
我尝试对创建的点使用addlistener(在GUI_OpeningFcn位置)；但是，我无法弄清楚该怎么做，因为直到创建按钮后该手柄才存在.
I tried using addlistener (in the GUI_OpeningFcn postion) for the created point; however, I cannot figure out how to do this, as the handle doesn't exist until after the pushbutton is created.
因此，问题是:如何动态地执行计算并在移动点时吐出值?下面是按钮的代码(它可以完成我想要的).但是移动点后如何重新计算?
Thus the issue: How can I dynamically perform a calculation and spit out the value upon moving a point? Below is the code for the pushbutton (which does what I want). But how can I recalculate after moving the point?
也许，使用WindowbuttonDownFcn可以解决此问题吗?同样，只是不确定如何将其合并到GUI中.
Perhaps, could this be down using WindowbuttonDownFcn? Again, just not sure how to incorporate this into the GUI.
% --- 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)
h = findobj('Name', 'N');
Ndata = guidata(h);
axes(Ndata.axes1);
mypoint = drawpoint;
handles.distx = mypoint.Position(1);
handles.disty = mypoint.Position(2);
xp = Ndata.xpix;
yp = Ndata.ypix;
handles.poix = abs(double(handles.distx) - double(Ndata.ISOx))/str2double(xp.String);
handles.poiy = abs(double(handles.disty) - double(Ndata.ISOy))/str2double(yp.String);
handles.poi = sqrt(handles.poix^2 + handles.poiy^2)+1.3;
set(handles.edit1, 'Value', handles.poi);
set(handles.edit1, 'String', num2str(handles.poi));
% Update handles structure
guidata(hObject, handles);
推荐答案
您可以在创建点之后添加事件侦听器.
You can add the event listener after creating the point.
-
创建点:
Create the point:
mypoint = drawpoint;
仅在不存在事件侦听器时添加事件侦听器(将其添加到handles):
%Add event listenr only if not exist
if ~isfield(handles, 'el')
handles.el = addlistener(mypoint, 'ROIMoved', @mypointmoved_Callback);
end
更新回调函数中的编辑框:
Update the edit box in the callback function:
function mypointmoved_Callback(src, eventData)
handles = guidata(src.Parent); %Get the handles using the parent of the point (the axes).
handles.distx = src.Position(1);
handles.disty = src.Position(2);
set(handles.edit1, 'String', num2str(handles.distx)); %Simplified version of your code.
drawnow
这是代码的简化版本(我在注释中放了一些代码):
Here is a simplified version of the code (I put some of your code in comments):
% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
%h = findobj('Name', 'N');
%Ndata = guidata(h);
%axes(Ndata.axes1);
axes(handles.axes1);
mypoint = drawpoint;
%Add event listenr only if not exist
if ~isfield(handles, 'el')
handles.el = addlistener(mypoint, 'ROIMoved', @mypointmoved_Callback);
end
handles.distx = mypoint.Position(1);
handles.disty = mypoint.Position(2);
% xp = Ndata.xpix;
% yp = Ndata.ypix;
% handles.poix = abs(double(handles.distx) - double(Ndata.ISOx))/str2double(xp.String);
% handles.poiy = abs(double(handles.disty) - double(Ndata.ISOy))/str2double(yp.String);
% handles.poi = sqrt(handles.poix^2 + handles.poiy^2)+1.3;
% set(handles.edit1, 'Value', handles.poi);
%set(handles.edit1, 'String', num2str(handles.poi));
set(handles.edit1, 'String', num2str(handles.distx));
% Update handles structure
guidata(hObject, handles);
function mypointmoved_Callback(src, eventData)
handles = guidata(src.Parent); %Get the handles using the parent of the point (the axes).
handles.distx = src.Position(1);
handles.disty = src.Position(2);
set(handles.edit1, 'String', num2str(handles.distx));
drawnow
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