[分享]绝对随机网点分布（excel之vba） [复制链接]

想学习的请研究下，直接给程序就没意思了，由于公司想做一套导光板的模具，没有现成的软件可用，就自己做了较简单的程序，虽然简单，但基本功能已经满足了导光板网点设计的要求；具备功能：任意多边形区域；含有光轴，且可以根据光源调整；网点密度可沿光轴方向调整，效果图如下：  {hzU  
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关键点说几个： bjQp6!TsZ  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） B}PT-S1l  
2.需要定义光轴的方向；简便的方法就是指定光源坐标，及网点区域坐标，这样光轴就确定了 i'w8Li  
3.网点区域密度可调；把区域分成若干小块，每块的密度不同即可 ,f4VV\  

以下是几个重要的函数： ;_o1{?~  
1.判断点在区域中函数 -C]k
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2.计算夹角函数 aC\O'KcH  
3.转置函数 R&>G6jZ?8  
4.得到区域中心点，及区域半径函数 Lro[ |A  
5.再有就是若干个点抽取其中一部分；或者采用随机分布（该方法会有重合点，所以没采用） ))/NGa  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 L}~"R/iWCT  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single  Re=()M  
   cax = x2 - x1 Vu0d\l^$  
   cay = y2 - y1 [@VM'@
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   cbx = x2 - x3 / [s TN.MG  
   cby = y2 - y3 q,i&%  
   mo_jj = cax * cbx + cay * cby .wU0F  
   mo_ca = Sqr(cax * cax + cay * cay) j*.K|77WHj  
   mo_cb = Sqr(cbx * cbx + cby * cby) YiO3.
+H  
   cos_acb = mo_jj / (mo_ca * mo_cb) 6'{/Ote  
   'ff_cos = cos_acb _>8rTk`/h  
   If cos_acb >= 1 Then ww}4  
   nn = 0 `D%U5
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   ElseIf cos_acb <= -1 Then lm;Dy*|<  
   nn = 3.14159265258979 y*G3dWb  
   Else LD=eMk: ~  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) h
SeXxSb:  
   End If o>6c?Xi&  
   'ff_angle = nn ->^Ex`  
   ff_angle = nn * 180 / 3.14159265258979 z#[PTqD-_  
End Function

'判断点在区域内函数 (GW"iL#.  
Function point_in(p1x As Single, p1y As Single, p2x As Single, p2y As Single, p3x As Single, p3y As Single, p4x As Single, p4y As Single, ppx As Single, ppy As Single) As Boolean `SH14
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Dim aob, boc, cod, doa, sum As Single :`>$B?x+  
  If ppx = p1x And ppy = p1y Then YYN'LF#j  
     point_in = True mo?*nO|-  
     Exit Function b9xvLR8  
  End If kR+7JUq]  
  If ppx = p2x And ppy = p2y Then QZm7 Q4  
     point_in = True 9Q.@RO$%C  
     Exit Function r) u@,P  
  End If '8yCwk  
   If ppx = p3x And ppy = p3y Then k-N}tk/5  
     point_in = True 7BS5Eq B=  
     Exit Function -d.i4X3j  
  End If d=p=eUd2  
     N>H#Ew@2U  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) |@1M'  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) ~n~j2OE  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) Dr)jB*yK  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) j8G$,~v  
    sum = aob + boc + cod + doa iG ,z3/~v  
    If 360.01 > sum And sum > 359.99 Then ]$,3vYBf  
       point_in = True *Fg)`M3g  
    Else -q]5@s/  
       point_in = False Xw#"?B(M]  
    End If 
#Dea$  
End Function

'得到点半径,得到交点坐标函数 @6 a'p  
Function rr(p1x As Single, p1y As Single, p2x As Single, p2y As Single, p3x As Single, p3y As Single, p4x As Single, p4y As Single) As Single() vGnFX0?h  
    '求得中心点坐标 gN2oUbf8  
Dim tt As String .Y0O.  
Dim rt(3) As Single kTcW=AXu  
    '判断是否平行  )$GCur~  
   acx = p3x - p1x ^?2zoS#iw  
   acy = p3y - p1y XtQwLH+F  
   bdx = p4x - p2x GkIhPn(d  
   bdy = p4y - p2y Lq62  
   If acx * bdy = acy * bdx Then ~Zn|(  
      rt(0) = 0 g=KvCqJN  
      Exit Function lGt:.p{NG  
   Else B]NcY&A
 
      '判断斜率存在否 UpPl-jeT  
      If p1x = p3x And p2x <> p4x Then jz~#K;3=,  
         tt = "ac_n_bd_y" Ai"MJ6)  
      ElseIf p1x <> p3x And p2x = p4x Then 5UJ ?1"J  
         tt = "ac_y_bd_n" }Q*J!OH  
      ElseIf p1x <> p3x And p2x <> p4x Then nLOK1@,4  
         tt = "ac_y_bd_y" 5NC77}^.  
      End If }.pqV X{d  
    Select Case tt Vc;g$Xr[  
         Case "ac_n_bd_y" NJSbS<O  
            'bd线段方程 Fe %Vp/  
            k_bd = bdy / bdx Ke:WlDf  
            b_bd = p2y - k_bd * p2x 3d]~e  
            p_x = p1x d&AO4^  
            p_y = k_bd * p_x + b_bd c&P/v
#U_  
         Case "ac_y_bd_n" k&uh  
            'ac线段方程 5rfDm  
            k_ac = acy / acx Hj(K*z  
            b_ac = p1y - k_ac * p1x g\?v 5  
            p_x = p2x }30Sb&"  
            p_y = k_ac * p_x + b_ac T*gG <8  
        Case "ac_y_bd_y" o>nw~_ H\  
           'ac，bd线段都要求 ,(-V<>/*.|  
           k_ac = acy / acx  4Y}Nu  
           b_ac = p1y - k_ac * p1x G'u[0>  
           k_bd = bdy / bdx nW*cqM%+  
           b_bd = p2y - k_bd * p2x "dGN0i  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) '&hd^9]Lo  
           p_y = k_ac * p_x + b_ac oc]:Ty  
        End Select ll1N`ke  
      rt(1) = p_x `d^Q!QxE  
      rt(2) = p_y M>|ZBEK  
     
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'计算最大半径 `"}).{N]C  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) ^>&#F[aT  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) hJ]Oa7r  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) .>#O'Z&q9  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) X(eW+,H  
Dim bb(5) As Single |OAM;@jH  
  bb(1) = rr1 \b%c_e  
  bb(2) = rr2 |pv$],&&:  
  bb(3) = rr3 SD:D8"8  
  bb(4) = rr4 k7Qs#L  
  nb = rr1 ^"
p. 3Hy  
For i = 1 To 4 zwU[!i)  
    If nb <= bb(i) Then ~c<8;,cjYR  
       nb = bb(i) )XavhS~Ff  
    End If 99`w'Nlk  
Next i U]gUGD!5x  
    rt(0) = Sqr(nb) OJ"./*H  
    rr = rt() +v 3:\#  
  End If ^+CWo@.  
         >qOG^{&x  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  `e =IXkt  

j8&NscK)  
有热压工艺方面的人才或者资料分享下； zZCRej  
我公司主要做透镜类产品，现在有客户要审核我公司的导光膜工艺，头疼 N5=BjXSAg  

高手真多！

楼主威武霸气.