[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： :,6dW?mun6  
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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： l&^9<th  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） wnN@aO6g*  
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 <j-Bj$3  
3.网点区域密度可调；把区域分成若干小块，每块的密度不同即可 ')}$v+9h  

以下是几个重要的函数： KSc&6UVz^  
1.判断点在区域中函数 (S=::ODU  
2.计算夹角函数 TJ ;4QL  
3.转置函数 )|q,RAn  
4.得到区域中心点，及区域半径函数 qL,QsRwN  
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） 2u~0B +)K/  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 mdoy1a  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single acRPKTs H  
   cax = x2 - x1 ~i=/@;wRp  
   cay = y2 - y1 f]0kG  
   cbx = x2 - x3 fc+P`r  
   cby = y2 - y3 Q4Hf!v]r  
   mo_jj = cax * cbx + cay * cby K/, B  
   mo_ca = Sqr(cax * cax + cay * cay) fu?>O/Gn/  
   mo_cb = Sqr(cbx * cbx + cby * cby) ^>72<1U%  
   cos_acb = mo_jj / (mo_ca * mo_cb) [64K?l0&  
   'ff_cos = cos_acb wGBQ.Ve[  
   If cos_acb >= 1 Then M+ ^]j  
   nn = 0 d9R0P2  
   ElseIf cos_acb <= -1 Then T=ox;r  
   nn = 3.14159265258979 ;^=eiurv  
   Else {t;Q#Ou.  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) %Jq(,u  
   End If KJ.ra\F  
   'ff_angle = nn U-Fr[1I6p  
   ff_angle = nn * 180 / 3.14159265258979 K}1>n2P  
End Function

'判断点在区域内函数 b!PN6<SI  
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 VS%8f.7ep  
Dim aob, boc, cod, doa, sum As Single D4c}z#}*0  
  If ppx = p1x And ppy = p1y Then MP w@O0QS  
     point_in = True q~;P^i<Y  
     Exit Function 8T&m{s  
  End If ~*LH[l>K  
  If ppx = p2x And ppy = p2y Then r&o%n5B  
     point_in = True S;Lqx5Cd  
     Exit Function 1&i!92:E  
  End If tCI8\~  
   If ppx = p3x And ppy = p3y Then 1k-^LdDj  
     point_in = True AZI%KM[  
     Exit Function ~.VWrHC  
  End If 6
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     f|m.v +7k  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) rQ30)5^V|  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) zblh_6  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) RgRyo  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) n`vqCO7@'  
    sum = aob + boc + cod + doa ~ Y4H)r  
    If 360.01 > sum And sum > 359.99 Then [B+o4+K3  
       point_in = True E{wV
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    Else IN ,@  
       point_in = False QbV)+7II=  
    End If Nr:%oD_G*  
End Function

'得到点半径,得到交点坐标函数 gS4K](KH |  
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() ` *$^rQS  
    '求得中心点坐标 yc_(L-'n  
Dim tt As String vkc(-n  
Dim rt(3) As Single l"CHI*  
    '判断是否平行 z*zLK[t+  
   acx = p3x - p1x MCz+l0  
   acy = p3y - p1y va~:oA  
   bdx = p4x - p2x \@MGOaR]  
   bdy = p4y - p2y M}(4>W  
   If acx * bdy = acy * bdx Then h*_r=' E  
      rt(0) = 0 Y49kq}  
      Exit Function ""d3ownKhw  
   Else ]A<\d  
      '判断斜率存在否 I".d>]16|  
      If p1x = p3x And p2x <> p4x Then dAym)  
         tt = "ac_n_bd_y" *v8Cj(69  
      ElseIf p1x <> p3x And p2x = p4x Then v*FCE 1HI  
         tt = "ac_y_bd_n" CSt6}_c!  
      ElseIf p1x <> p3x And p2x <> p4x Then G5TdAW  
         tt = "ac_y_bd_y" {;f`t3D  
      End If '9{H(DA  
    Select Case tt IBES$[  
         Case "ac_n_bd_y" ]2h~Db=  
            'bd线段方程 d<`Z{"g NS  
            k_bd = bdy / bdx r[EN`AxDb  
            b_bd = p2y - k_bd * p2x m[ifcDZ(e  
            p_x = p1x U~Uxs\0:  
            p_y = k_bd * p_x + b_bd B7?784{x,  
         Case "ac_y_bd_n" @ mtv2P`  
            'ac线段方程 (a&.Ad0{  
            k_ac = acy / acx tnRq?  
            b_ac = p1y - k_ac * p1x ;2#7"a^  
            p_x = p2x i+21tG$  
            p_y = k_ac * p_x + b_ac #V4_.t#  
        Case "ac_y_bd_y" 8Ln:y'K  
           'ac，bd线段都要求 vlEd=H,LT  
           k_ac = acy / acx li/IKS)e$  
           b_ac = p1y - k_ac * p1x Zt[ PkBi  
           k_bd = bdy / bdx .'__ [|-{;  
           b_bd = p2y - k_bd * p2x Yw?%>L  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) >"z
SW?  
           p_y = k_ac * p_x + b_ac )JeiTh^  
        End Select xQWZk`6~L  
      rt(1) = p_x f{*G%  
      rt(2) = p_y # ?}WQP!  
     .$99/2[90  
'计算最大半径 &S''fxGL  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) DX4 95<6*  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) \iu2rat^  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) ,((5|MbM/  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) h7gH4L!'u  
Dim bb(5) As Single 5:^dyF&sm{  
  bb(1) = rr1 ?%oPWmj}  
  bb(2) = rr2 hb`bQ  
  bb(3) = rr3 N-_2d*l3  
  bb(4) = rr4 )ae/+Q8  
  nb = rr1 HbZ3QWP  
For i = 1 To 4 }1X,~y]  
    If nb <= bb(i) Then &*/X*!_HK  
       nb = bb(i) 6`X#<#_&  
    End If $Iqt c)DA  
Next i /+02BP  
    rt(0) = Sqr(nb) k"GW3E;  
    rr = rt() 2&Wc4,O!i  
  End If H^'*F->BA  
         A/BL{ U}  
End Function

高手啊.人才啊.

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

-aKL 78  
有热压工艺方面的人才或者资料分享下； *%uv7G@%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 .yg"!X  

高手真多！

楼主威武霸气.