提高App Designer UI元素的刷新率

Question

我目前正在尝试显示我在Matlab应用程序设计器应用程序中通过串口接收的数据.我正在遭受线性仪表的极差刷新率(~1 Hz).

仪表的值由固定速率定时器更新,定时器设置为30Hz.计时器回调中的时间戳打印显示我以正确的频率调用它.我的计算机非常强大,任务管理器没有显示任何高负载的迹象 - 实际上,MATLAB应用程序几乎不消耗任何CPU时间.它实际上不仅仅是仪表而是所有UI元素.

所以我的猜测 - 或更好:我的希望 - 是刷新率必须有一些硬性上限.但是,官方文档没有提供有关如何更改此内容的任何提示.

我的MATLAB版本是R2016b.

所以我的问题:

• 这是用R2017a修复的吗？

• 如果没有:我可以做些什么,即摆弄MATLAB内置文件？

这是一个MCV示例,演示了这个问题:

classdef testapp < matlab.apps.AppBase

% Properties that correspond to app components
properties (Access = public)
    UIFigure                  matlab.ui.Figure
    andwatchhowthisstartstospinsmoothlyGaugeLabel  matlab.ui.control.Label
    andwatchhowthisstartstospinsmoothlyGauge  matlab.ui.control.SemicircularGauge
    KeepturninghereKnobLabel  matlab.ui.control.Label
    KeepturninghereKnob       matlab.ui.control.Knob
end


properties (Access = private)
    tim_the_timer
    i = 0;
end

methods (Access = private)
    function app = refreshMeter(app, ~,~)
        % display timestamp
        datestr(now,'HH:MM:SS.FFF')

        % update the gauge
        app.andwatchhowthisstartstospinsmoothlyGauge.Value = app.i;
        app.i = app.i + 1;
        if app.i > 100
           app.i = 0;
        end
    end
end


methods (Access = private)

    % Code that executes after component creation
    function startupFcn(app)
       t = timer;
       t.TimerFcn = @app.refreshMeter;
       t.Period = 0.02;
       t.BusyMode = 'drop';
       t.ExecutionMode = 'fixedRate';
       start(t);
       app.tim_the_timer = t;
    end

    % Close request function: UIFigure
    function UIFigureCloseRequest(app, event)
        stop(app.tim_the_timer);
        delete(app.tim_the_timer);
        delete(app);
    end
end

% App initialization and construction
methods (Access = private)

    % Create UIFigure and components
    function createComponents(app)

        % Create UIFigure
        app.UIFigure = uifigure;
        app.UIFigure.Position = [100 100 640 480];
        app.UIFigure.Name = 'UI Figure';
        app.UIFigure.CloseRequestFcn = createCallbackFcn(app, @UIFigureCloseRequest, true);
        setAutoResize(app, app.UIFigure, true)

        % Create andwatchhowthisstartstospinsmoothlyGaugeLabel
        app.andwatchhowthisstartstospinsmoothlyGaugeLabel = uilabel(app.UIFigure);
        app.andwatchhowthisstartstospinsmoothlyGaugeLabel.HorizontalAlignment = 'center';
        app.andwatchhowthisstartstospinsmoothlyGaugeLabel.Position = [275 138 246 15];
        app.andwatchhowthisstartstospinsmoothlyGaugeLabel.Text = '... and watch how this starts to spin smoothly';

        % Create andwatchhowthisstartstospinsmoothlyGauge
        app.andwatchhowthisstartstospinsmoothlyGauge = uigauge(app.UIFigure, 'semicircular');
        app.andwatchhowthisstartstospinsmoothlyGauge.Position = [338 168 120 65];

        % Create KeepturninghereKnobLabel
        app.KeepturninghereKnobLabel = uilabel(app.UIFigure);
        app.KeepturninghereKnobLabel.HorizontalAlignment = 'center';
        app.KeepturninghereKnobLabel.Position = [119 265 112 15];
        app.KeepturninghereKnobLabel.Text = 'Keep turning here...';

        % Create KeepturninghereKnob
        app.KeepturninghereKnob = uiknob(app.UIFigure, 'continuous');
        app.KeepturninghereKnob.Position = [145 314 60 60];
    end
end

methods (Access = public)

    % Construct app
    function app = testapp()

        % 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

编辑:当我转动旋钮,滑块等时,我注意到仪表会立即更新.所以不知何故,更高的刷新率的能力肯定存在......但如何启用它而不必触摸控件？相应更新了MCV.

Answer 1

您应该能够通过调用回调drawnow中的函数来强制刷新refreshMeter。