[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： 9#O"^.Z !  
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图片:2.jpg

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关键点说几个： +]5JXt^  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） h=d&@k\g  
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 (Pvch!  
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 xCoQ>.4p  

以下是几个重要的函数： Q'$aFl'NR  
1.判断点在区域中函数
q;>'jHh  
2.计算夹角函数 z'fGHiX7.0  
3.转置函数 W9a H]9b  
4.得到区域中心点，及区域半径函数 _W]3_1Lu  
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） 3<'SnP3mY  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 gt}/C4|  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single rpDH>Hzq  
   cax = x2 - x1 mP3:Fc_G  
   cay = y2 - y1 u)
fbR  
   cbx = x2 - x3 w;>]L.n  
   cby = y2 - y3 YBHmd  
   mo_jj = cax * cbx + cay * cby ?A,gDk/#  
   mo_ca = Sqr(cax * cax + cay * cay) y5+-_x,  
   mo_cb = Sqr(cbx * cbx + cby * cby) 7&m*: J  
   cos_acb = mo_jj / (mo_ca * mo_cb) |l7e*$j  
   'ff_cos = cos_acb SGjaH8z  
   If cos_acb >= 1 Then $~zqt%}  
   nn = 0 ed>_=i  
   ElseIf cos_acb <= -1 Then %"+FN2nbm  
   nn = 3.14159265258979 s)xfTr_$  
   Else 63-`3R?;  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) {7B$%G'  
   End If 4.CLTy3W  
   'ff_angle = nn 3lA<{m;V  
   ff_angle = nn * 180 / 3.14159265258979 tEBf2|<  
End Function

'判断点在区域内函数 7d'4"c;*;  
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 w#XE!8`  
Dim aob, boc, cod, doa, sum As Single 9I30ULm  
  If ppx = p1x And ppy = p1y Then 8>Ervi`  
     point_in = True LNk 3=v2M  
     Exit Function fs>0{  
  End If 0#sk]Qz  
  If ppx = p2x And ppy = p2y Then cnCUvD]'  
     point_in = True HmRwh  
     Exit Function ] p'+F  
  End If w&:h^u  
   If ppx = p3x And ppy = p3y Then iT9cw`A^%  
     point_in = True z9;vE7n!  
     Exit Function pB?a5jpA  
  End If k=nfo-h  
     >D<nfG<s Z  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) OdwSNG  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) /i DS#l\0  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) >i@gR  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) `d3S0N6@  
    sum = aob + boc + cod + doa v`x~
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    If 360.01 > sum And sum > 359.99 Then ][wS}~):  
       point_in = True 6sB!m|zm]:  
    Else l]3g6c  
       point_in = False G9Azd^3  
    End If a,&Kvh  
End Function

'得到点半径,得到交点坐标函数 CAcnH  
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() V~e1CZ(2X  
    '求得中心点坐标 ']+H P9i$  
Dim tt As String ?:n{GK  
Dim rt(3) As Single K=`*cSU>  
    '判断是否平行 Qyd3e O_  
   acx = p3x - p1x l*%voKZG  
   acy = p3y - p1y \4zvknk<  
   bdx = p4x - p2x =7Tbu'O;  
   bdy = p4y - p2y '[\%P2c)Q  
   If acx * bdy = acy * bdx Then L)B?p!cdLT  
      rt(0) = 0 X<-]./  
      Exit Function )2rI/=R  
   Else z{!wQ~ j  
      '判断斜率存在否 F<IqKgGz
H  
      If p1x = p3x And p2x <> p4x Then vkbB~gr@*  
         tt = "ac_n_bd_y" .=^h@C*   
      ElseIf p1x <> p3x And p2x = p4x Then 1Rp|*>  
         tt = "ac_y_bd_n" mjs*Z{_F^  
      ElseIf p1x <> p3x And p2x <> p4x Then `4;<\VYCr  
         tt = "ac_y_bd_y" bIWcL$}4Q  
      End If #/1A:ig  
    Select Case tt to:hMd1T  
         Case "ac_n_bd_y" $I1p"6  
            'bd线段方程 kAy.o  
            k_bd = bdy / bdx *'exvY~  
            b_bd = p2y - k_bd * p2x X]y3~|K  
            p_x = p1x m^]/ /j  
            p_y = k_bd * p_x + b_bd tQ2*kE  
         Case "ac_y_bd_n" Z$WT ~V  
            'ac线段方程 _MMz x2}  
            k_ac = acy / acx $T3/*xN  
            b_ac = p1y - k_ac * p1x JanLJe)  
            p_x = p2x +[~\\X  
            p_y = k_ac * p_x + b_ac /I6?t=?<  
        Case "ac_y_bd_y"
D4
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           'ac，bd线段都要求 3)dT+lZ  
           k_ac = acy / acx !4oYQB  
           b_ac = p1y - k_ac * p1x Eda sGCo  
           k_bd = bdy / bdx \19XDqf8  
           b_bd = p2y - k_bd * p2x )(DV~1r=  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) Th,2gX9  
           p_y = k_ac * p_x + b_ac @ZX{q~g!  
        End Select GSpS8wWD }  
      rt(1) = p_x ?hDEFW9&^x  
      rt(2) = p_y sV[|op  
     c+4SGWmO  
'计算最大半径 7g&_`(  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) $L`7(0U-  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) % )|/s%W  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) *FG@Dts^&  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) F7"Ihb^l  
Dim bb(5) As Single }^LcKV  
  bb(1) = rr1 88G[XkL$2  
  bb(2) = rr2 F ^E(AE  
  bb(3) = rr3 RKBjrSZg8  
  bb(4) = rr4 Q g"{F},4  
  nb = rr1 3:=XU9p)x  
For i = 1 To 4 sDbALAp +  
    If nb <= bb(i) Then v3]q2*`G#  
       nb = bb(i) C2Y&qX,  
    End If =20Q!wcu  
Next i '`3-X];p  
    rt(0) = Sqr(nb) %FF S&vd  
    rr = rt() XUSfOf(  
  End If I[e7Up  
         {[Yv@CpN  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  0dgR;Dl(  

->j9(76"  
有热压工艺方面的人才或者资料分享下； lv\2vRYw-  
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 |]I?^:I
 

高手真多！

楼主威武霸气.