如何在 MATLAB GUI 中获取分段线性函数

发布于 2024-10-26 19:57:45 字数 607 浏览 6 评论 0原文

我想在 MATLAB 2010a 中实现一个 GUI，用户能够以交互方式输入分段线性函数（通过单击添加/删除点并通过拖放移动点）。这里是 C# 中的实现。

我希望 MATLAB 中有类似的实现，它使用轴或任何其他对象来捕获鼠标事件并更新分段函数。以下是分段线性函数形式的用户输入的一些示例：

在此处输入图像描述

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热鲨 2024-11-02 19:57:45

将下面的函数保存到路径上名为 addPoint.m 的 m 文件中，并在命令行中输入以下内容：

>> hFigure = figure;
>> hAxes = axes('Parent', hFigure);
>> set(hAxes, 'ButtonDownFcn', @addPoint);

这将创建一个轴，每次单击轴。 addPoint 创建一条线（如果尚不存在线），获取单击点的坐标，并将这些坐标添加到线的 XData 和 YData 属性中线。

function addPoint(hObject, eventdata)

% Get the clicked point.
currentPoint = get(hObject, 'CurrentPoint');

% Get the handle to the plotted line. Create a line if one doesn't exist
% yet.
hLine = get(hObject, 'Children');
if isempty(hLine)
    hLine = line(0, 0, ...
        'Parent', hObject, ...
        'Marker', 's', ...
        'MarkerEdgeColor', 'r');
end

% Temporarily set the axes units to normalized.
axesUnits = get(hObject, 'Units');
set(hObject, 'Units', 'normalized');

% Get the clicked point and add it to the plotted line.
data(:,1) = get(hLine, 'XData');
data(:,2) = get(hLine, 'YData');
data(end+1,:) = [currentPoint(1,1) currentPoint(1,2)];
data = sortrows(data, 1);
set(hLine, 'XData', data(:,1), 'YData', data(:,2));

% Reset the axes units.
set(hObject, 'Units', axesUnits);

您可以通过防止第一次单击后自动更新轴限制来改进这一点。

Save the function below to an m-file on your path called addPoint.m and enter the following at the command line:

>> hFigure = figure;
>> hAxes = axes('Parent', hFigure);
>> set(hAxes, 'ButtonDownFcn', @addPoint);

This creates an axes that will execute addPoint every time the axes is clicked. addPoint creates a line if no line exists already, gets the coordinates of the clicked point and adds these coordinates to the XData and YData properties of the line.

function addPoint(hObject, eventdata)

% Get the clicked point.
currentPoint = get(hObject, 'CurrentPoint');

% Get the handle to the plotted line. Create a line if one doesn't exist
% yet.
hLine = get(hObject, 'Children');
if isempty(hLine)
    hLine = line(0, 0, ...
        'Parent', hObject, ...
        'Marker', 's', ...
        'MarkerEdgeColor', 'r');
end

% Temporarily set the axes units to normalized.
axesUnits = get(hObject, 'Units');
set(hObject, 'Units', 'normalized');

% Get the clicked point and add it to the plotted line.
data(:,1) = get(hLine, 'XData');
data(:,2) = get(hLine, 'YData');
data(end+1,:) = [currentPoint(1,1) currentPoint(1,2)];
data = sortrows(data, 1);
set(hLine, 'XData', data(:,1), 'YData', data(:,2));

% Reset the axes units.
set(hObject, 'Units', axesUnits);

You could improve this by preventing the axes limits from being automatically updated after the first click.

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