Communication between MATLAB code and GUI

Question

Miroslav Jiránek 2020-3-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513959-communication-between-matlab-code-and-gui

评论： Geoff Hayes 2020-3-31

Hello all,

Maybe I have very simple question, but I can't find out how to start communicate my programme in MATLAB with GUI. GUI looks like this. I placed the background image of the crossroad in GUI, where the whole simulation should run

function background_CreateFcn(hObject, eventdata, handles)
bg = imread('C:\Users\Miroslav\Desktop\Crossroad\cross_matl.png'); imagesc(bg);
uistack(bg, 'bottom');       

At the beginning of the matlab program, I initialize the images of cars which has to be moved on the crossroad in GUI.

openfig('C:\Users\Miroslav\Desktop\Crossroad\GUI_final.fig'); %opening GUI
hold on 
%----------------------DOWN -> UP --------------------------------------
car_9=imread('C:\Users\Miroslav\Desktop\Crossroad\blue_car.png'); 
car_10=imread('C:\Users\Miroslav\Desktop\Crossroad\red_car.png');
car_11=imread('C:\Users\Miroslav\Desktop\Crossroad\white_car.png');
car_12=imread('C:\Users\Miroslav\Desktop\Crossroad\yellow_car.png');
CAR_9 = Move_DU(); %deklaration objects to the class
CAR_10 = Move_DU();
CAR_11 = Move_DU();
CAR_12 = Move_DU();
DU = [CAR_9,CAR_10,CAR_11,CAR_12]; 
car_9_img = imagesc('CData',car_9,'XData',DU(1).getCurrentX(),'YData',DU(1).getCurrentY());  %loading images GUI
car_10_img = imagesc('CData',car_10,'XData',DU(2).getCurrentX(),'YData',DU(2).getCurrentY()); 
car_11_img = imagesc('CData',car_11,'XData',DU(3).getCurrentX(),'YData',DU(3).getCurrentY()); 
car_12_img = imagesc('CData',car_12,'XData',DU(4).getCurrentX(),'YData',DU(4).getCurrentY()); 
du = [car_9_img,car_10_img,car_11_img,car_12_img];  

But when I start the program, images of cars makes their own figure, where they start moving

So.. My question is. How to plot images of cars on the background in the GUI?

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Answer 1

Geoff Hayes 2020-3-30

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513959-communication-between-matlab-code-and-gui#answer_422851

Miroslav - is the "only" difference between https://www.mathworks.com/matlabcentral/answers/511717-image-rendering-in-gui and this question is that your crossroads is now a background image? If so, why not create an axes in your GUI where you place the crossroads image and then use that same axes to add the cars? (In a similar fashion as to what you did in the other question.)

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Geoff Hayes 2020-3-30

编辑：Geoff Hayes 2020-3-30

在 MATLAB Online 中打开

Well you would have to create it in GUIDE. Unless background your axes? If that is the case, then you would use handles.background to make use of the axes. As for the code you have in the background_CreateFcn, I would put that in your GUI OpeningFcn instead. And I would put the remainder of that code there too

car_9=imread('C:\Users\Miroslav\Desktop\Crossroad\blue_car.png'); 
car_10=imread('C:\Users\Miroslav\Desktop\Crossroad\red_car.png');
car_11=imread('C:\Users\Miroslav\Desktop\Crossroad\white_car.png');
car_12=imread('C:\Users\Miroslav\Desktop\Crossroad\yellow_car.png');
CAR_9 = Move_DU(); %deklaration objects to the class
CAR_10 = Move_DU();
CAR_11 = Move_DU();
CAR_12 = Move_DU();
DU = [CAR_9,CAR_10,CAR_11,CAR_12]; 
car_9_img = imagesc('CData',car_9,'XData',DU(1).getCurrentX(),'YData',DU(1).getCurrentY());  %loading images GUI
car_10_img = imagesc('CData',car_10,'XData',DU(2).getCurrentX(),'YData',DU(2).getCurrentY()); 
car_11_img = imagesc('CData',car_11,'XData',DU(3).getCurrentX(),'YData',DU(3).getCurrentY()); 
car_12_img = imagesc('CData',car_12,'XData',DU(4).getCurrentX(),'YData',DU(4).getCurrentY()); 
du = [car_9_img,car_10_img,car_11_img,car_12_img];  

Looking more closely at what you have done, you have a script that opens the GUI but then does all this other work outside of the GUI. You don't need a separate script and you should be able to add all of your code to the GUI OpeningFcn or callbacks as needed.

Geoff Hayes 2020-3-31

在 MATLAB Online 中打开

I'm not sure what you mean by matlab even writes that it doesn't have a handle by itself when I generate Create_Fcn. What error message are you seeing? What code generates the error? If background is your axes object, then just move this code to populate it to your OpeningFcn (which the hint is telling you to do) where the handle to this object will exist. This function should look something like

% --- Executes just before GUI_final is made visible.
function GUI_final_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 GUI_final (see VARARGIN)
% Choose default command line output for GUI_final
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes untitled1 wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% <---------- add this code ----------->
bg = imread('C:\Users\Miroslav\Desktop\Crossroad\cross_matl.png'); 
imagesc(handles.background, bg);

Note that how you use the axes handle in imagesc depends upon the version of MATLAB that you are using. And if background is the handle to the axes, then your script will need to know about it so that it can add and move the cars on this background OR move your logic from the script into the GUI OR change your script into a function which takes inputs (current car positions, velocities, etc.) and then returns the updated car positions, velocities, etc.

Miroslav Jiránek 2020-3-31

FINALLY its working. Thank you so much for your advices and patience

Geoff Hayes 2020-3-31

No problem! :)

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Communication between MATLAB code and GUI

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