在matlab创建写字板并能保存用鼠标所画的图片

以下是一个基本的Matlab写字板程序，可以创建一个GUI界面，允许用户在画板上绘制，使用鼠标保存所画的图片。

function myPaint
% Create a GUI with drawing canvas and save button

% Create a new figure window
hFig = figure('Toolbar','none',...
              'Menubar', 'none',...
              'NumberTitle','off',...
              'Name','Paint',...
              'Units','normalized',...
              'Position',[0.2 0.2 0.6 0.6]);

% Create a new drawing canvas
hAx = axes('Parent',hFig,...
           'Units','normalized',...
           'Position',[0.05 0.05 0.9 0.85],...
           'XLim',[0 1],'YLim',[0 1],...
           'XTick',[],'YTick',[],...
           'Color',[1 1 1]);

% Create a save button
hButton = uicontrol('Parent',hFig,...
                    'Style','pushbutton',...
                    'String','Save',...
                    'Units','normalized',...
                    'Position',[0.4 0.92 0.2 0.05],...
                    'Callback',@saveButton_Callback);

% Initialize the drawing state
drawing = false;
lastPoint = [];

% Define the callback function for mouse button down
set(hAx,'ButtonDownFcn',@startDrawing);

% Define the callback function for mouse movement
set(hFig,'WindowButtonMotionFcn',@drawLine);

% Define the callback function for mouse button up
set(hFig,'WindowButtonUpFcn',@stopDrawing);

% Callback function for mouse button down
function startDrawing(hObject, eventdata)
    drawing = true;
    lastPoint = get(hAx,'CurrentPoint');
    lastPoint = lastPoint(1,1:2);
end

% Callback function for mouse movement
function drawLine(hObject, eventdata)
    if drawing
        currentPoint = get(hAx,'CurrentPoint');
        currentPoint = currentPoint(1,1:2);
        line([lastPoint(1) currentPoint(1)], [lastPoint(2) currentPoint(2)],...
             'Color','k','LineWidth',2);
        lastPoint = currentPoint;
    end
end

% Callback function for mouse button up
function stopDrawing(hObject, eventdata)
    drawing = false;
end

% Callback function for save button
function saveButton_Callback(hObject, eventdata)
    [filename, pathname] = uiputfile({'*.png';'*.jpg';'*.bmp';'*.tif'},'Save As');
    if isequal(filename,0) || isequal(pathname,0)
        return;
    end
    print(hFig, fullfile(pathname, filename), '-dpng', '-r300');
end

end

运行此程序后，您可以使用鼠标在画板上绘制任何图形。点击保存按钮将弹出文件对话框，允许您选择要保存的文件类型和位置。程序将绘图保存为PNG，JPG，BMP或TIF格式中的一个。