互动情节——情节变化

Question

我正在尝试使用带有滑块的 uicontrol 创建一个 GUI，它将继续根据用户在数据上设置滑块的位置来分割我的数据集，我该如何做到这一点并使用用户设置的值到 trim 下我的数据集并为我的其余函数使用较小的数据集？这是我到目前为止创建的

function myui

 MM = load('DATA.txt');
 X = MM(:,4);
  % Create a figure and axes
 f = figure('Visible','off');

 sldplot=plot(X)

  n = length(X);     


slider1 = uicontrol('Style', 'slider','Min',1,'Max',n,'Value',n,'Position', [100 20 120 20],'Callback', @slider1_Callback);

slider2 = uicontrol('Style', 'slider','Min',1,'Max',n,'Value',1,'Position', [400 20 120 20],'Callback', @slider2_Callback);
txt = uicontrol('Style','text','Position',[400 45 120 20],'String','Second cut');
txt2 = uicontrol('Style','text','Position',[100 45 120 20],'String','First cut');
addlistener(slider1, 'ContinuousValueChange', @myCallbackFcn1)
addlistener(slider2, 'ContinuousValueChange', @myCallbackFcn2)

    function myCallbackFcn1(source,callbackdata)

n2 = get(slider1,'Value');
n3 = get(slider2, 'Value');

plot(X(n2:n3))
set(sldplot,'xdata',X(n2:n3));

drawnow;
    end
    f.Visible = 'on';

    function slider1_Callback(source,callbackdata)
        val = get(slider1,'Value');

        Xnew = X(val:n);

    end

    function slider2_Callback(source,callbackdata)
        val2 = get(slider2,'Value');


        Xnew2 = X(1:val2);
    end


 end

然而，这似乎不是我想要的。我得到了数据的静态图，滑块似乎没有移动或放大数据

Answer 1

你快搞定了。在回调中，您实际上不需要再次调用 plot，因为您在函数的开头就获得了绘图的句柄。您需要做的只是更新显示的 x 和 y 数据。

我做了一些小改动，现在可以正常使用了。我重命名了侦听器回调以给它们提供更多信息的名称，并使用虚拟数据进行绘图。您将需要根据自己的数据进行调整，但这并不难。我还交换了两个滑块的初始值。

这是代码。我在 added/modified 东西的地方添加了 %// === NEW ===。

function myui
clear
clc
close all

%// Uncomment this and adjust the rest to fit with your data
%MM = load('DATA.txt');
%X = MM(:,4);

X = rand(1,100);

% Create a figure and axes
f = figure('Visible','off');

%// == NEW ==
%// Create an axes
hAxes = axes('Position',[.1 .15 .8 .8]);
sldplot=plot(X);

%// == NEW ==
%// Get axis limits to make sure the limits always stay the same
x_limit = get(gca,'XLim');
y_limit = get(gca,'YLim');

n = numel(X);

%// == NEW ==  I changed the values of the sliders
slider1 = uicontrol('Style', 'slider','Min',1,'Max',n,'Value',1,'Position', [100 5 120 20],'Callback', @slider1_Callback);

slider2 = uicontrol('Style', 'slider','Min',1,'Max',n,'Value',n,'Position', [400 5 120 20],'Callback', @slider2_Callback);
txt = uicontrol('Style','text','Position',[400 30 120 15],'String','Second cut');
txt2 = uicontrol('Style','text','Position',[100 30 120 15],'String','First cut');

%// ======== NEW ========

button1 = uicontrol('Style','push','position',[260 20 60 20],'String','Get Xnew','Callback',@ButtonCallback)

%// =====================

addlistener(slider1, 'ContinuousValueChange', @Slider1ListenerCallback);
addlistener(slider2, 'ContinuousValueChange', @Slider2ListenerCallback);
set(f,'Visible','on');

    function Slider1ListenerCallback(source,callbackdata)

        n2 = round(get(slider1,'Value'));
        n3 = round(get(slider2, 'Value'));

        %// == NEW ==
        %// Updata xdata only. DO NOT plot again
        set(sldplot,'xdata',(n2:n3),'ydata',X(n2:n3));

        %// == NEW ==
        set(gca,'XLim',x_limit,'YLim',y_limit)
        drawnow;
    end


    function slider1_Callback(source,callbackdata)
        n2 = round(get(slider1,'Value'));
        n3 = round(get(slider2, 'Value'));

        %// Updata xdata and ydata only. DO NOT plot again
        set(sldplot,'xdata',(n2:n3),'ydata',X(n2:n3));

        set(gca,'XLim',x_limit,'YLim',y_limit)
        drawnow;

    end


    function Slider2ListenerCallback(source,callbackdata)

        n2 = round(get(slider1,'Value'));
        n3 = round(get(slider2, 'Value'));

        %// Updata xdata and ydata only. DO NOT plot again
        set(sldplot,'xdata',(n2:n3),'ydata',X(n2:n3));

        set(gca,'XLim',x_limit,'YLim',y_limit)
        drawnow;
    end


    function slider2_Callback(source,callbackdata)
        n2 = round(get(slider1,'Value'));
        n3 = round(get(slider2, 'Value'));

        %// Updata xdata and ydata  only. DO NOT plot again
        set(sldplot,'xdata',(n2:n3),'ydata',X(n2:n3));

        set(gca,'XLim',x_limit,'YLim',y_limit)
        drawnow;

    end

%// ======== NEW ========
    function ButtonCallback(source,callbackdata)
        n2 = round(get(slider1,'Value'));
        n3 = round(get(slider2, 'Value'));

        Xnew = X(n2:n3)
    end
%// =====================
end

以及移动两个滑块后的屏幕截图：

为了得到XNew我添加了一个按钮。将 Xnew = X(n2:n3) 放在函数的最后一个 end 之前会导致错误，因为启动函数时既没有定义 n2 也没有定义 n3，因为 Matlab 从头到尾读取所有代码底部。因此按一个按钮获取值更安全。

互动情节——情节变化

Interactive plot - plot changing

matlab

user-interface

matlab-figure