這是畫一個開口水箱，顯示水位變化的動態圖像。麻煩大神能一步步詳細解釋下case2這部分代碼。謝謝！function [sys,x0]=animtank(t,x,u,flag,ts) global tankdemoif flag==2,if any(get(0,'Children')==tankdemo),if strcmp(get(tankdemo,'Name'),'Tank Demo'),% Update tank one leveltankHndlList=get(tankdemo,'UserData');yData=get(tankHndlList(1),'YData');yOffset=yData(1);yData(3:4)=[1 1]*u(2)+yOffset;set(tankHndlList(1),'YData',yData);yData=get(tankHndlList(2),'YData');yData([3 4])=[1 1]*u(2)+yOffset;set(tankHndlList(2),'YData',yData);yData=[1 1]*u(1)+1;set(tankHndlList(3),'YData',yData);drawnow;endendsys=[];x0=[];elseif flag==0;% Initialize the figure for use with this simulationfuzzy_animinit('Tank Demo');tankdemo=findobj(0,'Name','Tank Demo');tank1Wid=1;tank1Ht=2;tank1Init=0;setPt=0.5;tankX=[0 0 1 1]-0.5;tankY=[1 0 0 1];% Draw the tankline(1.1*tankX*tank1Wid+1,tankY*tank1Ht+0.95,'LineWidth',2,'Color','black');tankX=[0 1 1 0 0]-0.5;tankY=[0 0 1 1 0];% Draw the waterwaterX=tankX*tank1Wid+1;waterY=tankY*tank1Init+1;tank1Hndl=patch(waterX,waterY,'blue','EdgeColor','none');% Draw the gray wallwaterY([1 2 5])=tank1Ht*[1 1 1]+1;waterY([3 4])=tank1Init*[1 1]+1;tank2Hndl=patch(waterX,waterY,[.9 .9 .9],'EdgeColor','none');% Draw the set pointlineHndl=line([0 0.4],setPt*[1 1]+1,'Color','red','LineWidth',4);set(gcf, ...'Color',[.9 .9 .9], ...'UserData',[tank1Hndl tank2Hndl lineHndl]);set(gca, ...'XLim',[0 2],'YLim',[0 3.5], ...'XColor','black','YColor','black', ...'Box','on');axis equalxlabel('Water Level Control','Color','black','FontSize',10);set(get(gca,'XLabel'),'Visible','on')sys=[0 0 0 2 0 0];x0=[];end;