midterm(part2)

classdef mid38a < matlab.apps.AppBase

    % Properties that correspond to app components

    properties (Access = public)

        UIFigure           matlab.ui.Figure

        PlayButton         matlab.ui.control.Button

        StopButton         matlab.ui.control.Button

        UIAxes             matlab.ui.control.UIAxes

        VolumeSliderLabel  matlab.ui.control.Label

        VolumeSlider       matlab.ui.control.Slider

        FreqSliderLabel    matlab.ui.control.Label

        FreqSlider         matlab.ui.control.Slider

        ReverseButton      matlab.ui.control.Button

    end

    properties (Access = private)

        fs = 44100;    

        Freq;

        music; 

        signal;

        y;  

        y1;

        y2;

    end

    methods (Access = private)

        % Code that executes after component creation

        function startupFcn(app)

            [app.y1,app.fs] = audioread('Sick Boy.wav',[1 1411200]);

            app.signal = app.y1;

            title(app.UIAxes, 'Freq');

            xlabel(app.UIAxes, 'Time');

            ylabel(app.UIAxes, 'amplitude');

        end

        % Button pushed function: PlayButton

        function PlayButtonPushed(app, event)

            app.Freq = app.fs * app.FreqSlider.Value;

            app.signal = app.y1 *10*exp(app.VolumeSlider.Value);          

            app.music = audioplayer(app.signal,app.Freq);

            play(app.music,app.Freq); 

            time = (1:length(app.signal))/app.Freq;

            plot(app.UIAxes, time, app.signal);

        end

        % Button pushed function: StopButton

        function StopButtonPushed(app, event)

            stop(app.music);  

        end

        % Value changed function: VolumeSlider

        function VolumeSliderValueChanged(app, event)

            value = app.VolumeSlider.Value;

        end

        % Button pushed function: ReverseButton

        function ReverseButtonPushed(app, event)

            app.Freq = app.fs * app.FreqSlider.Value;

            app.y2 = app.y1 *10*exp(app.VolumeSlider.Value); 

            app.music=  audioplayer(flipud(app.y2), app.Freq);  % 播放前後顛倒的音訊波形

            play(app.music, app.Freq);

            time = (1:length( app.y2))/app.Freq;

            plot(app.UIAxes, time,  flipud(app.y2));

        end

    end

    % App initialization and construction

    methods (Access = private)

        % Create UIFigure and components

        function createComponents(app)

            % Create UIFigure

            app.UIFigure = uifigure;

            app.UIFigure.Position = [100 100 760 576];

            app.UIFigure.Name = 'UI Figure';

            % Create PlayButton

            app.PlayButton = uibutton(app.UIFigure, 'push');

            app.PlayButton.ButtonPushedFcn = createCallbackFcn(app, @PlayButtonPushed, true);

            app.PlayButton.BackgroundColor = [0.9608 0.9608 0.9608];

            app.PlayButton.FontSize = 36;

            app.PlayButton.Position = [40 338 123 83];

            app.PlayButton.Text = 'Play';

            % Create StopButton

            app.StopButton = uibutton(app.UIFigure, 'push');

            app.StopButton.ButtonPushedFcn = createCallbackFcn(app, @StopButtonPushed, true);

            app.StopButton.BackgroundColor = [0.9608 0.9608 0.9608];

            app.StopButton.FontSize = 36;

            app.StopButton.Position = [40 103 123 83];

            app.StopButton.Text = 'Stop';

            % Create UIAxes

            app.UIAxes = uiaxes(app.UIFigure);

            title(app.UIAxes, 'Title')

            xlabel(app.UIAxes, 'X')

            ylabel(app.UIAxes, 'Y')

            app.UIAxes.Position = [191 103 514 318];

            % Create VolumeSliderLabel

            app.VolumeSliderLabel = uilabel(app.UIFigure);

            app.VolumeSliderLabel.HorizontalAlignment = 'right';

            app.VolumeSliderLabel.Position = [62 477 46 22];

            app.VolumeSliderLabel.Text = 'Volume';

            % Create VolumeSlider

            app.VolumeSlider = uislider(app.UIFigure);

            app.VolumeSlider.Limits = [1 5];

            app.VolumeSlider.MajorTicks = [1 2 3 4 5 6 7 8 9 10];

            app.VolumeSlider.ValueChangedFcn = createCallbackFcn(app, @VolumeSliderValueChanged, true);

            app.VolumeSlider.Position = [129 486 225 3];

            app.VolumeSlider.Value = 1;

            % Create FreqSliderLabel

            app.FreqSliderLabel = uilabel(app.UIFigure);

            app.FreqSliderLabel.HorizontalAlignment = 'right';

            app.FreqSliderLabel.Position = [413 477 30 22];

            app.FreqSliderLabel.Text = 'Freq';

            % Create FreqSlider

            app.FreqSlider = uislider(app.UIFigure);

            app.FreqSlider.Limits = [0 3];

            app.FreqSlider.MajorTicks = [0 0.5 1 1.5 2 2.5 3];

            app.FreqSlider.Position = [464 486 235 3];

            app.FreqSlider.Value = 1;

            % Create ReverseButton

            app.ReverseButton = uibutton(app.UIFigure, 'push');

            app.ReverseButton.ButtonPushedFcn = createCallbackFcn(app, @ReverseButtonPushed, true);

            app.ReverseButton.FontSize = 28;

            app.ReverseButton.Position = [40 221 123 83];

            app.ReverseButton.Text = 'Reverse';

        end

    end

    methods (Access = public)

        % Construct app

        function app = mid38a

            % Create and configure components

            createComponents(app)

            % Register the app with App Designer

            registerApp(app, app.UIFigure)

            % Execute the startup function

            runStartupFcn(app, @startupFcn)

            if nargout == 0

                clear app

            end

        end

        % Code that executes before app deletion

        function delete(app)

            % Delete UIFigure when app is deleted

            delete(app.UIFigure)

        end

    end

end