%顯示初始界面
screen=get(0,'screensize');
winw=screen(3);winh=screen(4);

windface=figure('color',[0.9 0.9 0.9],'position',[0.2*winw,0.2*winh,0.6*winw,0.6*winh],...
       'name','《控制理論CAI》','numbertitle','off','menubar','none',...
        'resize','on');
    
%在面板上顯示歡迎字幕，并設置其底色，color為顏色，pos為位置,show(pos,color,'填要出現的字')，
%pos[x, y, width, height],當位小數點是，表示占整個面板的百分比，比如，0.2,即占總面板的百分之20
color=[.9,.9,.9];
pos=[0.35,0.85,0.3,0.05];
showtext(pos,color,'歡迎使用'); 
pos=[0.21,0.8,0.6,0.05];
showtext(pos,color,'《控制理論計算機輔助教學軟件包》');
pos=[0.35,0.75,0.3,0.05];
showtext(pos,color,'V1.0.1');
pos=[0.20,0.25,0.6,0.05];
showtext(pos,color,'設計者：侯曉棟');
pos=[0.20,0.20,0.6,0.05];
showtext(pos,color,'指導老師：李雅青');
pos=[0.20,0.04,0.6,0.05];
showtext(pos,color,'版權所有:中北大學分校機電工程系     (c)2005 ');


str=['close(windface);mymainmenu'];
uicontrol(windface,'style','push','string','Ok',...
       'position',[0.25,0.1,0.2,0.07],'units','normalized',...
      'callback',str,'fontsize',12);
uicontrol(windface,'style','push','string','About...',...
       'position',[0.55,0.1,0.2,0.07],'units','normalized',...
      'callback',' mycabout','fontsize',12);
%在面板上顯示一個圖形，是surf型的
[m,n]=meshgrid(-3:1/8:3);%meshigrid(產生"格點"矩陣),meshgrid(x,網格間距,y)
z=3*(1-m).^2.*exp(-(m.^2)-(n+1).^2)-10*(m/5-m.^3-n.^5).*exp(-m.^2-n.^2)-1/3*exp(-(m+1).^2-n.^2);
surf(m,n,z);
axis off; %將軸的顯示關掉