EGR 115 Introduction to Computing for Engineers Graphical User Interface Design in MATLAB - Part 2 Monday 24 Nov 2014 EGR 115 Introduction to Computing for Engineers

Lecture Outline Monday 24 Nov 2014 EGR 115 Introduction to Computing for Engineers Graphical User Interface Design in MATLAB  A 3D animation inside a GUI Slide 2 of 13

Graphical User Interface Design in MATLAB Monday 24 Nov 2014 EGR 115 Introduction to Computing for Engineers Lets create a more sophisticated GUI  Create a GUI that animates the rotation of a coordinate frame o Allow multiple rotations in sequence  Each could be about either about the x, y, or z axes o User should enter the angle for each rotation using sliders  Angle in degrees o Extra: Add a few standard UI controls  Zoom, … Slide 3 of 13

Graphical User Interface Design in MATLAB Monday 24 Nov 2014 EGR 115 Introduction to Computing for Engineers Upon startup draw initial x, y, and z axes  Use code from lecture: Complex Numbers & 3D Plots3 o Mon, Nov 10  Start with a new empty GUI o Add the code from plot 3D to the beginning of the Opening function % --- Executes just before Rot_3D is made visible. function Rot_3D_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 Rot_3D (see VARARGIN) -- Add your code here!!! Slide 4 of 13

Graphical User Interface Design in MATLAB Monday 24 Nov 2014 EGR 115 Introduction to Computing for Engineers Test your initialization code before proceeding Next add sliders to control x, y, and z-axis rotation Slide 5 of 13

Graphical User Interface Design in MATLAB Monday 24 Nov 2014 EGR 115 Introduction to Computing for Engineers Create the three sliders  Set slider property: o Tag: slider_thetaX o Min: 0.0 and Max: o Value: 0.0  Set slider property: o Tag: slider_thetaY o Min: 0.0 and Max: o Value: 0.0  Set slider property: o Tag: slider_thetaZ o Min: 0.0 and Max: o Value: 0.0 Slide 6 of 13

Graphical User Interface Design in MATLAB Monday 24 Nov 2014 EGR 115 Introduction to Computing for Engineers How can we update the lines and text using the slider angles?  Set the XData, Ydata, and Zdata properties of the lines and ‘Position’ of the text o Need handles to the objects!!  They must all be unique!!  Also store the current location of the x, y, and z-axes o Store in a matrix “R_mat” hlx = line([0 1], [0 0], [0 0],'Color','r', 'LineWidth', 3); htx = text(1.2, 0, 0, 'X','Color','r','FontSize',14); hly = line([0 0], [0 1], [0 0],'Color','g', 'LineWidth', 3); hty = text( 0, 1.2, 0,'Y','Color','g','FontSize',14); hlz = line([0 0], [0 0], [0 1],'Color','b', 'LineWidth', 3); htz = text(0, 0, 1.2,'Z','Color','b','FontSize',14); R_mat = eye(3,3);% The current x, y, and z axis vectors (cols) Slide 7 of 13

Graphical User Interface Design in MATLAB Monday 24 Nov 2014 EGR 115 Introduction to Computing for Engineers  We need to share those handles with the three callback functions  Add to the variable names “handles” structure in the Opening Function!! o Lets place all of those handles (and R_mat) into a single structure  Now add this structure to the “handles” data structure % Create a structure to contain all of our handles and R_mat my_plot = struct('lineX', hlx, 'lineY', hly, 'lineZ', hlz,... 'textX', htx, 'textY', hty, 'textZ', htz,... 'XYZ', R_mat); % Choose default command line output for Rot_3D handles.output = hObject; handles.my_3Dframe = my_plot; The “handles” data structure is available to all of the functions!!! Slide 8 of 13

Graphical User Interface Design in MATLAB Monday 24 Nov 2014 EGR 115 Introduction to Computing for Engineers Now add code to each of the slider callback functions  For example the slider ThetaX o Use the rotate_x function from past homework assignment o “Pull-out” the x, y, and z axes for more readable code % Get the rotational angle and convert to rad theta = get(hObject, 'Value') * pi/180; % Update R_mat based on the requested rotation handles.my_3Dframe.XYZ = handles.my_3Dframe.XYZ*rotate_x(theta); % For ease of use define the current x, y, and z axes x = handles.my_3Dframe.XYZ(:,1); % Col 1 y = handles.my_3Dframe.XYZ(:,2); % Col 2 z = handles.my_3Dframe.XYZ(:,3); % Col 3 Use the debugger to test along the way!! Slide 9 of 13

Graphical User Interface Design in MATLAB Monday 24 Nov 2014 EGR 115 Introduction to Computing for Engineers  For example, for the slider ThetaX o Only need to rotate the y and z axes!! % Update the location of lines and text % Update y-axis (second col of R matrix) set(handles.my_3Dframe.lineY,'XData',... [0 y(1)], 'YData', [0 y(2)], 'ZData', [0 y(3)]); set(handles.my_3Dframe.textY,'Position', [1.2*y(1), 1.2*y(2), 1.2*y(3)]); % Update z-axis (third col of R matrix) set(handles.my_3Dframe.lineZ,'XData',... [0 z(1)], 'YData', [0 z(2)], 'ZData', [0 z(3)]); set(handles.my_3Dframe.textZ,'Position', [1.2*z(1), 1.2*z(2), 1.2*z(3)]); Test along the way!! Slide 10 of 13

Graphical User Interface Design in MATLAB Monday 24 Nov 2014 EGR 115 Introduction to Computing for Engineers Finally, we must update the “handles” to store our updated R_matrix Do the same for slider ThetaY and slider ThetaZ % Update handles structure guidata(hObject, handles); Test along the way!! Slide 11 of 13

Monday 24 Nov 2014 EGR 115 Introduction to Computing for Engineers Want to apply change in  and not the absolute value of  for each slider!! persistent theta_k_1 if isempty(theta_k_1) theta_k_1 = 0.0; end % Get the rotational angle and convert to rad theta_k = get(hObject, 'Value') * pi/180; theta = theta_k - theta_k_1; theta_k_1 = theta_k; Slide 12 of 13 MATLAB code of our GUI

Next Lecture Monday 24 Nov 2014 EGR 115 Introduction to Computing for Engineers An open review  Work on our Battleship GUI? Slide 13 of 13