Matlab 实现GUI界面相应鼠标事件 |
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Matlab 实现GUI界面相应鼠标事件
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和C++平台一样，MATLAB也能在GUI设计中写入鼠标事件 **功能：**拖动鼠标左键时，在Axes区域画线，松开时不画，再次点击时画线… 少数几个需要用到的函数和属性 ·WindowButtonDownFcn回调函数 ·Selectiontype属性（判断单击/双击，左键/右键） ·Normal左键单击 ·Alt右键单击（Ctrl+左键） ·Open双击 ·Extend中键（Shift+左键） 由于Line对象的父对象为Axes，故而在GUI界面中添加一个Axes对象。 首先需要判断： 1：我们是否按下了鼠标左键 :2：然后在WindowsButtonMotionFcn回调函数中来选择是否绘制曲线。 打开WindowButtonFcn的回调函数，判断是否按下了鼠标左键，通过窗口的SelectionType属性判断鼠标左键的行为，以全局变量global将（是否按下了鼠标左键）的信息传递出去。 按下鼠标左键，SelectionType值为normal 为了下一次在移动鼠标时可以绘制坐标曲线，因此需要将当前鼠标左键移动的位置记录下来，可以使用Axes的CurrentPoint属性，并将该句柄pos1保存到全局变量（后续也会用到） pos1 = get(handles.axes1,'CurrentPoint');该回调函数的代码为： function figure1_WindowButtonDownFcn(hObject, eventdata, handles) % hObject handle to figure1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) global ButtonDown ; if strcmp(get(gcf,'SelectionType'),'normal') ButtonDown = 1; pos1 = get(handles.axes1,'CurrentPoint'); end然后添加界面的鼠标移动响应函数 然后绘制一一条线宽为4的曲线 如下为绘图的第一个点： linr([pos1(1,1) pos(1,1)],[pos1(1,2) pos(1,2)],'LineWidth',4);在下一次响应鼠标的移动函数时，上次响应时鼠标所处的位置为绘画位置的初始点 pos1 = pos ;然后在OpeningFcn中定义全局变量并且初始化为空 function Mouse_line_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 Mouse_line (see VARARGIN) global ButtonDown ps1 ButtonDown=[]; ps1=[]; % Choose default command line output for Mouse_line handles.output = hObject; % Update handles structure guidata(hObject, handles);运行结果： 原因： 没有设置松开鼠标时的回调函数 解决方法： 设置松开鼠标左键WindowButtonUpFcn的操作的回调函数 运行结果： 附上全代码： function varargout = Mouse_line(varargin) % MOUSE_LINE MATLAB code for Mouse_line.fig % MOUSE_LINE, by itself, creates a new MOUSE_LINE or raises the existing % singleton*. % % H = MOUSE_LINE returns the handle to a new MOUSE_LINE or the handle to % the existing singleton*. % % MOUSE_LINE('CALLBACK',hObject,eventData,handles,...) calls the local % function named CALLBACK in MOUSE_LINE.M with the given input arguments. % % MOUSE_LINE('Property','Value',...) creates a new MOUSE_LINE or raises the % existing singleton*. Starting from the left, property value pairs are % applied to the GUI before Mouse_line_OpeningFcn gets called. An % unrecognized property name or invalid value makes property application % stop. All inputs are passed to Mouse_line_OpeningFcn via varargin. % % *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one % instance to run (singleton)". % % See also: GUIDE, GUIDATA, GUIHANDLES % Edit the above text to modify the response to help Mouse_line % Last Modified by GUIDE v2.5 22-Oct-2020 15:06:51 % Begin initialization code - DO NOT EDIT gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @Mouse_line_OpeningFcn, ... 'gui_OutputFcn', @Mouse_line_OutputFcn, ... 'gui_LayoutFcn', [] , ... 'gui_Callback', []); if nargin && ischar(varargin{1}) gui_State.gui_Callback = str2func(varargin{1}); end if nargout [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:}); else gui_mainfcn(gui_State, varargin{:}); end % End initialization code - DO NOT EDIT % --- Executes just before Mouse_line is made visible. function Mouse_line_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 Mouse_line (see VARARGIN) global ButtonDown ps1 ButtonDown=[]; ps1=[]; % Choose default command line output for Mouse_line handles.output = hObject; % Update handles structure guidata(hObject, handles); % UIWAIT makes Mouse_line wait for user response (see UIRESUME) % uiwait(handles.figure1); % --- Outputs from this function are returned to the command line. function varargout = Mouse_line_OutputFcn(hObject, eventdata, handles) % varargout cell array for returning output args (see VARARGOUT); % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % Get default command line output from handles structure varargout{1} = handles.output; % --- Executes on mouse press over figure background, over a disabled or % --- inactive control, or over an axes background. function figure1_WindowButtonDownFcn(hObject, eventdata, handles) % hObject handle to figure1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) global ButtonDown pos1; if strcmp(get(gcf,'SelectionType'),'normal') ButtonDown = 1; pos1 = get(handles.axes1,'CurrentPoint'); end % --- Executes on mouse motion over figure - except title and menu. function figure1_WindowButtonMotionFcn(hObject, eventdata, handles) % hObject handle to figure1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) global ButtonDown pos1; if ButtonDown==1 pos=get(handles.axes1,'CurrentPoint'); line([pos1(1,1) pos(1,1)],[pos1(1,2) pos(1,2)],'LineWidth',4); pos1 =pos; end % --- Executes on mouse press over figure background, over a disabled or % --- inactive control, or over an axes background. function figure1_WindowButtonUpFcn(hObject, eventdata, handles) % hObject handle to figure1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) global ButtonDown ButtonDown = 0;===OVER |
由于WindowButtonFcn和WindowButtonMotionFcn是两个不同的回调函数，它们之间的信息需要共享（如判断鼠标是否按下），可以使用全局变量global …
通过全局变量ButtonDown判断是否按下了鼠标左键，按下了为1，并记录当前鼠标的位置。
能绘图，但是无法停下，鼠标移动，曲线跟着到处跑
松开鼠标的回调函数：
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