findldnode.m

来自「哈密顿马步图回路问题」· M 代码 · 共 74 行

function [ tmpNode ] = findldNode( mask )
%UNTITLED1 Summary of this function goes here
%  Detailed explanation goes here
leastN=inf;
ii=0;
jj=0;

for i=1:size(mask,1)
    for j=1:size(mask,2)
            if(mask(i,j)==0)
                n=0;
                if ((i-2)>0 & (j-1)>0)
                    n=n+1;                    
                end
                if ((i-2)>0 & (j+1)<=size(mask,2))
                    n=n+1;                    
                end
                if ((i-1)>0 & (j+2)<=size(mask,2))
                    n=n+1;                    
                end
                if ((i+1)<=size(mask,1) & (j+2)<=size(mask,2))
                    n=n+1;                    
                end
                if ((i+2)<=size(mask,1) & (j+1)<=size(mask,2))
                    n=n+1;                    
                end
                if ((i+2)<=size(mask,1) & (j-1)>0)
                    n=n+1;                    
                end
                if ((i+1)<=size(mask,1) & (j-2)>0)
                    n=n+1;                    
                end
                if ((i-1)>0 & (j-2)>0)
                    n=n+1;                    
                end
                
                if n<leastN
                    leastN=n;
                    ii=i;
                    jj=j;
                end
            end
    end    
end

if leastN==inf
    tmpNode=[];
else
    tmpNode(1,1)=(ii-1)*size(mask,2)+jj;
    if ((ii-2)>0 & (jj-1)>0)
        tmpNode(1,end+1)=(ii-3)*size(mask,2)+jj-1;                   
	end
	if ((ii-2)>0 & (jj+1)<=size(mask,2))
        tmpNode(1,end+1)=(ii-3)*size(mask,2)+jj+1;                 
	end
	if ((ii-1)>0 & (jj+2)<=size(mask,2))
        tmpNode(1,end+1)=(ii-2)*size(mask,2)+jj+2;                    
	end
	if ((ii+1)<=size(mask,1) & (jj+2)<=size(mask,2))
        tmpNode(1,end+1)=ii*size(mask,2)+jj+2;                   
	end
	if ((ii+2)<=size(mask,1) & (jj+1)<=size(mask,2))
        tmpNode(1,end+1)=(ii+1)*size(mask,2)+jj+1;                     
	end
	if ((ii+2)<=size(mask,1) & (jj-1)>0)
        tmpNode(1,end+1)=(ii+1)*size(mask,2)+jj-1;                    
	end
	if ((ii+1)<=size(mask,1) & (jj-2)>0)
        tmpNode(1,end+1)=ii*size(mask,2)+jj-2;                   
	end
	if ((ii-1)>0 & (jj-2)>0)
        tmpNode(1,end+1)=(ii-2)*size(mask,2)+jj-2;                     
	end
end