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pakchoi1987

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[求助] 保存成eps矢量图时出现问题

画的NURBS基函数,为什么输出eps格式时在分段区间边界处显示过于间断(理论上是间断的,但是输出到图片也太明显了,见下图)?如果输出位图而且取样点较多就不明显(如果x取点较少也会有间断,)程序代码如下,求大神帮忙


%!test
n = 6;
U = [0 0 0 1/8 5/8 6/8 1 1 1];
p = 2;
u = linspace (0, 1, 1000);  
s = findspan (n, p, u, U);  
Bref = [1.00000   0.00000   0.00000
         0.60494   0.37037   0.02469
         0.30864   0.59259   0.09877
         0.11111   0.66667   0.22222
         0.01235   0.59259   0.39506
         0.39506   0.59259   0.01235
         0.22222   0.66667   0.11111
         0.09877   0.59259   0.30864
         0.02469   0.37037   0.60494
         0.00000   0.00000   1.00000];
  B = basisfun (s, u, p, U);

  B1(:,1) = u';   
  B1(:,2) = B(:,1);
  B2(:,1) = u';
  B2(:,2) = B(:,2);
  B3(:,1) = u';   
  B3(:,2) = B(:,3);

  
  k11 = 1;
  k12 = 1;
  k13 = 1;
  k14 = 1;  
  k21 = 1;
  k22 = 1;
  k23 = 1;
  k24 = 1;
  k31 = 1;
  k32 = 1;
  k33 = 1;
  k34 = 1;

%分段画出,共4段(0~1/4;1/4~2/4;2/4~3/4;3/4~1)
  nmax = size(B,1);
for i = 1:nmax
  if (B1(i,1)>=0&&B1(i,1)<=1/8)
       B11(k11,:) = B1(i,:);
       k11=k11+1;
  elseif(B1(i,1)>=1/8&&B1(i,1)<=5/8)
       B12(k12,:) = B1(i,:);
       k12=k12+1;
  elseif(B1(i,1)>=5/8&&B1(i,1)<=6/8)
       B13(k13,:) = B1(i,:);
       k13=k13+1;
  elseif(B1(i,1)>=6/8&&B1(i,1)<=1)
       B14(k14,:) = B1(i,:);
       k14=k14+1;      
  end
  
  if (B2(i,1)>=0&&B2(i,1)<=1/8)
       B21(k21,:) = B2(i,:);
       k21=k21+1;
  elseif(B2(i,1)>=1/8&&B2(i,1)<=5/8)
       B22(k22,:) = B2(i,:);
       k22=k22+1;
  elseif(B2(i,1)>=5/8&&B2(i,1)<=6/8)
       B23(k23,:) = B2(i,:);
       k23=k23+1;
  elseif(B2(i,1)>=6/8&&B2(i,1)<=1)
       B24(k24,:) = B2(i,:);
       k24=k24+1;      
  end
  
  if (B3(i,1)>=0&&B3(i,1)<=1/8)
       B31(k31,:) = B3(i,:);
       k31=k31+1;
  elseif(B3(i,1)>=1/8&&B3(i,1)<=5/8)
       B32(k32,:) = B3(i,:);
       k32=k32+1;
  elseif(B3(i,1)>=5/8&&B3(i,1)<=6/8)
       B33(k33,:) = B3(i,:);
       k33=k33+1;
  elseif(B3(i,1)>=6/8&&B3(i,1)<=1)
       B34(k34,:) = B3(i,:);
       k34=k34+1;      
  end
end

plot(B11(:,1),B11(:,2),B12(:,1),B12(:,2),B13(:,1),B13(:,2),B14(:,1),B14(:,2),B21(:,1),B21(:,2),B22(:,1),B22(:,2),B23(:,1),B23(:,2),B24(:,1),B24(:,2),B31(:,1),B31(:,2),B32(:,1),B32(:,2),B33(:,1),B33(:,2),B34(:,1),B34(:,2))

保存成eps矢量图时出现问题
2014-3-28 10-59-55.jpg
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