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%
clc;clear;close all;
rand('state',0);
set(gcf,'DoubleBuffer','on');
N=256; % Éú³É״̬¾ØÕó´óСµÄ¿ØÖƲÎÊý
S=ones(N); % Éú³É״̬¾ØÕóS
% S(N/2,N/4:N*3/4)=0; % ÉèÖÃ״̬¾ØÕóµÄ³õʼֵ
S(N/2:N*3/4,N/2)=0; % ÉèÖÃ״̬¾ØÕóµÄ³õʼֵ
Ii=imshow(S); % ÏÔʾ״̬¾ØÕó
ti=title(['time = 0',', N=0'],'Fontsize',14,'Fontname','Times New Roman'); % ÏÔʾʱ¼ä
T=0; % ¼Ç¼ʱ¼äµÄ²ÎÊý
for k=1:30000; % Ñ­»·¼ÆËã
    xt=4; % ²úÉúÁ£×ÓµÄλÖÃ
    yt=N/2; % ²úÉúÁ£×ÓµÄλÖÃ
    Ss=0; % ¿ØÖÆÏÂÃæÑ­»·ÊÇ·ñÖÕÖ¹µÄ²ÎÊý
    while Ss<1; % ¼ÆË㵱ǰÁ£×ÓµÄÎü¸½¹ý³Ì
        [dx,dy]=choose_D(0.25,0.25,0.25,0.25); % ¼ÆËãÁ£×ÓÎ»ÒÆÁ¿
        xt=xt+dx; % ¼ÆËãÏÂһʱ¿ÌÁ£×ÓµÄλÖÃ
        yt=yt+dy; % ¼ÆËãÏÂһʱ¿ÌÁ£×ÓµÄλÖÃ
        if xt<2.5|xt>N-1.5||yt<2.5|yt>N-1.5; % ÅжÏÁ£×ÓÊÇ·ñÒݳö±ß½ç           
            Ss=2; % °ÑSs¸³ÖµÎª2,´Ó¶ø¿ÉÒÔÍ˳öÑ­»·
        end
        if [S(xt+1,yt)+S(xt-1,yt)+S(xt,yt+1)+S(xt,yt-1)]<3.5; % ÅжϽüÁÚÊÇ·ñÓÐÁ£×Ó
            S(xt,yt)=0; % ¹Ì¶¨µ±Ç°Ô˶¯µÄÁ£×Ó
            Ss=2; % °ÑSs¸³ÖµÎª2,´Ó¶ø¿ÉÒÔÍ˳öÑ­»·
        end               
    end
    set(Ii,'CData',S); % ÏÔʾµ±Ç°×´Ì¬¾ØÕó
    T=T+1; % ÀÛ¼Óʱ¼ä²ÎÊý
    set(ti,'String',['time = ',num2str(T),', N=',num2str(sum(sum(1-S))-[N/4+1])]); % ¸üÐÂʱ¼ä²ÎÊý
    pause(0.01); % ÔÝͣһϣ¬ÏÔʾ¶¯»­Ð§¹û
end
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