[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： i15uHl  
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图片:2.jpg

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关键点说几个： )~T)$TS  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） d47b&.v8e  
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 &kHp}\  
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 '49&qO5B  

以下是几个重要的函数： *j?tcxq
 
1.判断点在区域中函数 ,@tkL!"9q  
2.计算夹角函数 fB:9:NX  
3.转置函数
8E&}+DR?  
4.得到区域中心点，及区域半径函数 $/Gvz)M  
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） @J
Z I  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 b4Br!PL@G  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single O%H_._#N`  
   cax = x2 - x1 `utv@9 _z  
   cay = y2 - y1 rIH/<@+  
   cbx = x2 - x3 upg?  
   cby = y2 - y3 }&I\a  
   mo_jj = cax * cbx + cay * cby WjW+EF8(  
   mo_ca = Sqr(cax * cax + cay * cay) '3 w=D )  
   mo_cb = Sqr(cbx * cbx + cby * cby) P9p:x6  
   cos_acb = mo_jj / (mo_ca * mo_cb) +D[|L1{xb  
   'ff_cos = cos_acb B]L5K~d  
   If cos_acb >= 1 Then <`i"5`J  
   nn = 0 Ve*NM|jg  
   ElseIf cos_acb <= -1 Then t.$3?"60~  
   nn = 3.14159265258979 n1m[7s.[&  
   Else z}.y ?#  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 7Ab&
C&3  
   End If ']Gqa$(YC  
   'ff_angle = nn 'MRvH lCM  
   ff_angle = nn * 180 / 3.14159265258979 &PVos|G  
End Function

'判断点在区域内函数 gF-<%<RV  
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 XTEC0s"F  
Dim aob, boc, cod, doa, sum As Single .) uUpY%K^  
  If ppx = p1x And ppy = p1y Then "X0"
=1R~  
     point_in = True lffp\v{w  
     Exit Function 7[h_"@_A7  
  End If T6m#sVq  
  If ppx = p2x And ppy = p2y Then L9Sd4L_e  
     point_in = True [ -
"o5!0<  
     Exit Function d0Xb?- }3M  
  End If %a=K:" oU[  
   If ppx = p3x And ppy = p3y Then Ec IgX_\  
     point_in = True *vt5dxB  
     Exit Function aSdh5?  
  End If %E#OUo[y/  
     M4 SJnE  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) LOQoi8j  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) @ODwO;_R5  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) s3qWTdM  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) Mx{VN P  
    sum = aob + boc + cod + doa q9
fCoz  
    If 360.01 > sum And sum > 359.99 Then 2w\$}'  
       point_in = True 56gpAc  
    Else ?PVJeFH  
       point_in = False y6NOHPp@  
    End If BC*vG=a  
End Function

'得到点半径,得到交点坐标函数 t`NZ_w /  
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() {Hncm  
    '求得中心点坐标 SY\ UuZ  
Dim tt As String r_C|gfIP  
Dim rt(3) As Single - s[=$pDU  
    '判断是否平行 1=BDqSZ@9  
   acx = p3x - p1x ! |SPOk  
   acy = p3y - p1y T=r-6eN  
   bdx = p4x - p2x ~^d. zIN!  
   bdy = p4y - p2y
iEx
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+  
   If acx * bdy = acy * bdx Then r~cmrLQa  
      rt(0) = 0 P^m+SAAB  
      Exit Function u8ofgcFYE  
   Else Y `4AML  
      '判断斜率存在否 3t<XbHF9  
      If p1x = p3x And p2x <> p4x Then *Q2;bmIc  
         tt = "ac_n_bd_y" tHNvb\MR$  
      ElseIf p1x <> p3x And p2x = p4x Then <$\vL  
         tt = "ac_y_bd_n" v*Tliw`-U  
      ElseIf p1x <> p3x And p2x <> p4x Then z_%G{H+:l  
         tt = "ac_y_bd_y" KrOoxrDcp  
      End If nQ|4.e;  
    Select Case tt ' JHCf  
         Case "ac_n_bd_y" <p@c%e,_  
            'bd线段方程 .d< +-w2Mu  
            k_bd = bdy / bdx gcYx-gA}  
            b_bd = p2y - k_bd * p2x hUirvDvX  
            p_x = p1x ;>^oe:@  
            p_y = k_bd * p_x + b_bd wMy$T<:   
         Case "ac_y_bd_n" _;
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            'ac线段方程 blxAy  
            k_ac = acy / acx e$F]t*)Xa  
            b_ac = p1y - k_ac * p1x n8(B%KF  
            p_x = p2x y*2R#jTA  
            p_y = k_ac * p_x + b_ac z0J$9hEg89  
        Case "ac_y_bd_y" p.K
X[I  
           'ac，bd线段都要求 'Cy^G;  
           k_ac = acy / acx >Gbj1>C}  
           b_ac = p1y - k_ac * p1x F#=XJYG1  
           k_bd = bdy / bdx gfQ&U@N  
           b_bd = p2y - k_bd * p2x TR!^wB<F  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) 9k
\`3SE  
           p_y = k_ac * p_x + b_ac }.Eq_wP<  
        End Select Zu(eYH=Q  
      rt(1) = p_x 3/IQ]8g"  
      rt(2) = p_y 8r[ZGUV  
     :V2"<]  
'计算最大半径 [vki^M5i|Z  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) u#5/s8  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) v-6"*EP  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) /UeLf$%ZW  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) -1Y9-nn[m  
Dim bb(5) As Single Ke-Q>sm2Q  
  bb(1) = rr1 YArNJ5z=  
  bb(2) = rr2 #!p=P<4M  
  bb(3) = rr3 x_1JQDE  
  bb(4) = rr4 L'{;V\d  
  nb = rr1 4GJ1
P2  
For i = 1 To 4 ={' "ATX(U  
    If nb <= bb(i) Then E_&Hje|J_[  
       nb = bb(i) ZK5(_qW&i  
    End If CG'NC\x5  
Next i "cjZ6^Hum  
    rt(0) = Sqr(nb) 1?)iCe  
    rr = rt()
) Kf
k\  
  End If #QJ  mAA  
          {ZFa +  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  CkoPno  

~p;<H  
有热压工艺方面的人才或者资料分享下； w%S<N  
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 .u7
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高手真多！

楼主威武霸气.