How do I draw circles in App Designer with user inputting the x, y and radii values?

Question

Dev Chhatbar 2022-12-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1880157-how-do-i-draw-circles-in-app-designer-with-user-inputting-the-x-y-and-radii-values

评论： Image Analyst 2022-12-18

Hi,

So i am creating a project where I need to be able to draw multiple circles with different x, y and radii values. I was able to make one circle but it had a fixed radius and I would like it to be such that the user can input the different values and that is then used to plot the circle. This is what I have written down so far. I would appreciate any help I can get!

            clear;
            r    = 4;
            caca = 2*pi;
            ang  = linspace(0,caca);
            xp   = r*cos(ang);
            yp   = r*sin(ang);
            circ = [xp;yp];
            figure(1)
            plot(xp,yp)

I tried writing:

r = inputdlg;

but it just wouldn't work. I mean it would allow the user to input the value but wouldn't plot a circle.

Any ideas on how I can get the user to enter the x, y and radii values and have it plot perfectly on a graph. I also want it to plot multiple circles.

Thank you!

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Answer 1

VBBV 2022-12-17

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在 MATLAB Online 中打开

In the app designer, you can invoke the follwing code,

% in the app designer 
prompt = {'Enter radius of circle:', 'Enter centre:'}
T_L = 'Circle'
dims = [1 40]
out = inputdlg(prompt,T_L,dims)
caca = 2*pi;
ang  = linspace(0,caca);
r = str2num(out{1});
C = str2num(out{2});
xp = C(1)*cos(ang);
yp = C(2)*sin(ang);             
plot(xp,yp,'r-')

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Image Analyst 2022-12-17

在 MATLAB Online 中打开

If you don't want the user to click to define a center point with drawpoint you can use getinput(). If you won't want the user to click and drag out a circle interactively, you can ask them on your GUI, or you can call inputdlg Adapt this snippet as needed, but I think it's not convenient for your user as compared to clicking on the image.

% Ask user for two floating point numbers.
defaultValue = {'45.67', '78.91'};
titleBar = 'Enter values';
userPrompt = {'Enter floating point number 1 : ', 'Enter floating point number 2: '};
caUserInput = inputdlg(userPrompt, titleBar, 1, defaultValue);
if isempty(caUserInput),return,end % Bail out if they clicked Cancel.
% Convert to floating point from string.
usersValue1 = str2double(caUserInput{1})
usersValue2 = str2double(caUserInput{2})
% Check usersValue1 for validity.
if isnan(usersValue1)
    % They didn't enter a number.
    % They clicked Cancel, or entered a character, symbols, or something else not allowed.
    % Convert the default from a string and stick that into usersValue1.
    usersValue1 = str2double(defaultValue{1});
    message = sprintf('I said it had to be a number.\nTry replacing the user.\nI will use %.2f and continue.', usersValue1);
    uiwait(warndlg(message));
end
% Do the same for usersValue2
% Check usersValue2 for validity.
if isnan(usersValue2)
    % They didn't enter a number.
    % They clicked Cancel, or entered a character, symbols, or something else not allowed.
    % Convert the default from a string and stick that into usersValue2.
    usersValue2 = str2double(defaultValue{2});
    message = sprintf('I said it had to be a number.\nTry replacing the user.\nI will use %.2f and continue.', usersValue2);
    uiwait(warndlg(message));
end

Dev Chhatbar 2022-12-17

在 MATLAB Online 中打开

@VBBV, @Image Analyst This is what my code looks like right now. Have to say, it's not functioning.

% Ask user for two floating point numbers.
                defaultValue = {'45.67', '78.91'};
                titleBar = 'Enter values';
                userPrompt = {'Enter floating point number 1 : ', 'Enter floating point number 2: '};
                caUserInput = inputdlg(userPrompt, titleBar, 1, defaultValue);
                if isempty(caUserInput),return,end % Bail out if they clicked Cancel.
                % Convert to floating point from string.
                usersValue1 = str2double(caUserInput{1})
                usersValue2 = str2double(caUserInput{2})
                % Check usersValue1 for validity.
                if isnan(usersValue1)
                    % They didn't enter a number.
                    % They clicked Cancel, or entered a character, symbols, or something else not allowed.
                    % Convert the default from a string and stick that into usersValue1.
                    usersValue1 = str2double(defaultValue{1});
                    message = sprintf('I said it had to be a number.\nTry replacing the user.\nI will use %.2f and continue.', usersValue1);
                    uiwait(warndlg(message));
                end
                % Do the same for usersValue2
                % Check usersValue2 for validity.
                if isnan(usersValue2)
                    % They didn't enter a number.
                    % They clicked Cancel, or entered a character, symbols, or something else not allowed.
                    % Convert the default from a string and stick that into usersValue2.
                    usersValue2 = str2double(defaultValue{2});
                    message = sprintf('I said it had to be a number.\nTry replacing the user.\nI will use %.2f and continue.', usersValue2);
                    uiwait(warndlg(message));
                end
                T_L = 'Circle'
                dims = [1 40]
                caca = 2*pi;
                ang  = linspace(0,caca);
                r = str2double(caUserInput{1});
                C = str2double(caUserInput{2});
                xp = C(1)*cos(ang);
                yp = C(2)*sin(ang);             
                plot(xp,yp,'r-')
                

Dev Chhatbar 2022-12-17

编辑：Dev Chhatbar 2022-12-17

@Image Analyst- Yes! That's a good point. I wonder why I didn't change that. You're right. Those are three things my user would need to enter. And based off of that, I'm meant to apply those inputs and plot the circles and then find the intersection point and draw tangential lines!