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% --- Executes just before mmmove is made visible.
function mmmove_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 mmmove (see VARARGIN)

% Choose default command line output for mmmove
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes mmmove wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = mmmove_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;

% --------------------------------------------------------------------
function Debug_Callback(hObject, eventdata, handles)
% hObject    handle to Debug (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% --------------------------------------------------------------------
function run_Callback(h, eventdata, handles)
% hObject    handle to run (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
prompt={'請輸入速度v:','請輸入長度L:','請輸入半徑r:'};
defans={'5','10','2'};
v=5;L=10;r=2;
p=inputdlg(prompt,'Input',1,defans);
v=str2double(p(1));
L=str2double(p(2));
r=str2double(p(3));
%guidata(h,handles)
if v<=0|L<=0|r<=0
    warndlg('非法輸入','警告')
else
ox1=r;oy1=r;ox2=r+L;oy2=r;
x1=r:0.015*v:r+L;
y1=2*r*ones(size(x1));
thita=0:0.015*v/r:pi;
x2=sin(thita)*r+ox2;
y2=cos(thita)*r+oy2;
x3=r+L:-0.015*v:r;
y3=zeros(size(x3));
x4=-sin(thita)*r+ox1;
y4=-cos(thita)*r+oy1;
x=[x1 x2 x3 x4 x1(1)];
y=[y1 y2 y3 y4 y1(1)];
plot(x,y);
axis([0,2*r+L,-1,2*r+1]);
h_text=text(0,-2,['L = ' num2str(L) ' , ' 'r = ' num2str(r) ' , ' 'v = ' num2str(v)]);
set(h_text,'fontSize',13);
axis equal
set(gca,'Visible','off')
hm=line(r,2*r,'color','red','marker','.','markersize',37,'erasemode','xor');
while 1
    for i=1:length(x)
        set(hm,'xdata',x(i),'ydata',y(i));
        pause(0.0003)
        drawnow
    end
end
end

為了能讓小球不停的循環(huán)運動，我加了while 1的語句。
這樣在關(guān)閉窗口的時候，matlab的命令窗里就會跳出一堆錯誤，大概是因為for循環(huán)里涉及到的hm隨著figure的關(guān)閉刪除了，但是程序仍然在運行，所以跳出東西說hm是invalid的。是不是可以放個停止程序的函數(shù)放figure或者axis的deleteFcn里頭，不過沒找到那樣的函數(shù)。
期待好心大牛指教。。。
還有就是速度控制問題，用計算的的速度控制，運行明顯偏慢，大概是程序自己運行也耗時吧，這個也不知道怎么辦。不過后來看到篇文章說用timer對象來產(chǎn)生動畫的，很不錯的樣子。
先引用下來：

MATLAB GUI中利用定時器制作動畫