[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： Zy>iaG9}  
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描述:请输入描述

图片:2.jpg

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关键点说几个： wz,T7L  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） AX Y.80+  
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 FAS+*GFz  
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 <O5r|  

以下是几个重要的函数： Y7vTs
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1.判断点在区域中函数 %~V+wqu  
2.计算夹角函数 1N`1~y  
3.转置函数 eb])=  
4.得到区域中心点，及区域半径函数 SNV[KdvP*  
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） ,ZpcvK/S  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 @} nI$x.  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single @R5jUPUVV  
   cax = x2 - x1 Bf72 .gx{0  
   cay = y2 - y1 n21Pfig  
   cbx = x2 - x3 4(VVEe  
   cby = y2 - y3 F{:ZHCm  
   mo_jj = cax * cbx + cay * cby *V\
z]Dy-[  
   mo_ca = Sqr(cax * cax + cay * cay) W+A-<Rh\  
   mo_cb = Sqr(cbx * cbx + cby * cby) |H:JwxH  
   cos_acb = mo_jj / (mo_ca * mo_cb) SIJ:[=5!7  
   'ff_cos = cos_acb =!axQ[)A  
   If cos_acb >= 1 Then 0WasE1t|  
   nn = 0 l7 +#gPA  
   ElseIf cos_acb <= -1 Then Q9(J$_:  
   nn = 3.14159265258979 1'skCR|!<  
   Else 7eQE[C  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1)
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   End If yIab3/#`  
   'ff_angle = nn xW$F-n  
   ff_angle = nn * 180 / 3.14159265258979 R^}}-Dvr  
End Function

'判断点在区域内函数 [x{S ,?6  
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 V#j|_N1hm  
Dim aob, boc, cod, doa, sum As Single ~c e?xr|  
  If ppx = p1x And ppy = p1y Then R&z)  
     point_in = True /UJ@e  
     Exit Function <OKzb3e  
  End If PGT*4r21  
  If ppx = p2x And ppy = p2y Then E$$pO.\  
     point_in = True h[5<S&  
     Exit Function
S(7_\8h  
  End If Hx}K wS  
   If ppx = p3x And ppy = p3y Then  b>N)H  
     point_in = True 0nkon3H  
     Exit Function |!r.p_Zt  
  End If *.
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     ^*;{Uj+O~Y  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 5K1WfdBX7)  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 4dDDi,)U  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) {x{/{{wzv  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) Z[.+Wd\)-9  
    sum = aob + boc + cod + doa &&iZ?JteZ  
    If 360.01 > sum And sum > 359.99 Then A#s`!SNv  
       point_in = True
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    Else Sz\"*W;>  
       point_in = False eqt+EiH   
    End If Jjb(lW  
End Function

'得到点半径,得到交点坐标函数 ;T0Y=yC  
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() x4SI TY  
    '求得中心点坐标 =*q|568  
Dim tt As String 2 }QD>  
Dim rt(3) As Single {}?;|&_  
    '判断是否平行 o0-7#2  
   acx = p3x - p1x  \Vis  
   acy = p3y - p1y )z0qKb\  
   bdx = p4x - p2x myTz  
   bdy = p4y - p2y W)"PYC4  
   If acx * bdy = acy * bdx Then X\SZ Q[gN  
      rt(0) = 0 m`<Mzk.u<  
      Exit Function RU!j"T 5  
   Else iSTr;>A  
      '判断斜率存在否 I)~&6@Jn  
      If p1x = p3x And p2x <> p4x Then Jtj_R
l !  
         tt = "ac_n_bd_y" }i1p&EN^  
      ElseIf p1x <> p3x And p2x = p4x Then %K^l]tWa@  
         tt = "ac_y_bd_n" i2{xW`AcUh  
      ElseIf p1x <> p3x And p2x <> p4x Then wj>mk  
         tt = "ac_y_bd_y" $|v_ pjUu]  
      End If R9SJ;TsE  
    Select Case tt Ti/t\'6  
         Case "ac_n_bd_y" )u7*YlU\I  
            'bd线段方程 DXlP(={*  
            k_bd = bdy / bdx z`-?5-a]I  
            b_bd = p2y - k_bd * p2x .I{b]
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            p_x = p1x _//)|.6c3  
            p_y = k_bd * p_x + b_bd iw<#V&([J  
         Case "ac_y_bd_n" v}hmI']yf  
            'ac线段方程 :+ef|,:`/  
            k_ac = acy / acx aG7
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            b_ac = p1y - k_ac * p1x &
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            p_x = p2x 'iO?M'0gE#  
            p_y = k_ac * p_x + b_ac y@[}FgVOh  
        Case "ac_y_bd_y" @NGK2J  
           'ac，bd线段都要求 E6
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           k_ac = acy / acx '~i}2e.  
           b_ac = p1y - k_ac * p1x A87JPX#R?  
           k_bd = bdy / bdx mH>oF|  
           b_bd = p2y - k_bd * p2x SU;PmG4  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) FL!W oTB  
           p_y = k_ac * p_x + b_ac {S(d5o8  
        End Select *vFVXJ
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      rt(1) = p_x Tl=cniy]  
      rt(2) = p_y ~vnG^y>%  
     Ed9ynJ~)X  
'计算最大半径 T9]|*~ ,T  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) DGr{x}Kq  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) 1g6AzUXg  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) 9ctvy?53H  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) ~U`oew  
Dim bb(5) As Single +8 5]]}I  
  bb(1) = rr1 L+Yn}"gIs  
  bb(2) = rr2 Zws[}G"7h  
  bb(3) = rr3 %)T>Wn%b]v  
  bb(4) = rr4 emOd<C1A  
  nb = rr1 aO('X3?  
For i = 1 To 4 4k_&Q?1  
    If nb <= bb(i) Then IRNL(9H  
       nb = bb(i) gO%#'Eb2  
    End If &Yi)|TU3'R  
Next i Htn=h~
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    rt(0) = Sqr(nb) 9Y!N\-x`  
    rr = rt() !"/]<OQ   
  End If 'HTr02riY  
         v.:aICB5  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  Vb{5-v ;a  

K:!){a[  
有热压工艺方面的人才或者资料分享下； Xjb 4dip  
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 BR&T,x/d  

高手真多！

楼主威武霸气.