matlab简易画板

function varargout = example6_3_3(varargin)gui_Singleton = 1;gui_State = struct('gui_Name',       mfilename, ...                   'gui_Singleton',  gui_Singleton, ...                   'gui_OpeningFcn', @example6_3_3_OpeningFcn, ...                   'gui_OutputFcn',  @example6_3_3_OutputFcn, ...                   'gui_LayoutFcn',  [] , ...                   'gui_Callback',   []);if nargin && ischar(varargin{1})    gui_State.gui_Callback = str2func(varargin{1});endif nargout    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});else    gui_mainfcn(gui_State, varargin{:});endfunction example6_3_3_OpeningFcn(hObject, eventdata, handles, varargin)handles.output = hObject;setappdata(hObject, 'isPressed', false);cData = imread('loading.jpg');image(cData);set(handles.axes1, 'colororder', [0 0 1], 'units', 'normalized', 'position', [0 0 1 1])guidata(hObject, handles);function varargout = example6_3_3_OutputFcn(hObject, eventdata, handles) varargout{1} = handles.output;function figure1_WindowButtonDownFcn(hObject, eventdata, handles)if strcmp(get(gcf,'selectiontype'),'alt')    delete(findobj('type', 'line', 'parent', handles.axes1));elseif strcmp(get(gcf,'selectiontype'),'open')    col=uisetcolor(get(handles.axes1,'colororder'),'选择画笔颜色');    set(handles.axes1,'colororder',col)else    pos=get(handles.axes1,'currentpoint');    setappdata(hObject, 'isPressed', true);    set(hObject, 'UserData', pos(1,[1,2]));endfunction figure1_WindowButtonMotionFcn(hObject, eventdata, handles)isPressed = getappdata(hObject, 'isPressed');pos = get(handles.axes1, 'currentpoint');if isPressed     pos1 = get(hObject, 'UserData');    line([pos1(1); pos(1, 1)],[pos1(2); pos(1, 2)], 'linewidth', 4);    set(hObject, 'UserData', pos(1,[1,2]));endfunction figure1_WindowButtonUpFcn(hObject, eventdata, handles)setappdata(hObject, 'isPressed', false);

书上的代码，贴出来学习下。(画上的话是豪仔刚跟我说的，广东人常这么说咩？哈哈)