[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： 'UfeluMd  
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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： ]vo_gKZ  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） k4y}&?$B  
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 6 hiC?2b{x  
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 L`3n2DEBf  

以下是几个重要的函数： 2`Gv5}LfyR  
1.判断点在区域中函数 &<1`O  
2.计算夹角函数 l(:kfR~AC  
3.转置函数 N|dD
!  
4.得到区域中心点，及区域半径函数 ]gP5f@`  
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） "H+,E_&(  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 ;YH[G;aJ  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single Z4q~@|+%  
   cax = x2 - x1 ..qd,9H  
   cay = y2 - y1 1>pe&n/  
   cbx = x2 - x3 tP(h9|[
N  
   cby = y2 - y3 q``wt  
   mo_jj = cax * cbx + cay * cby pJ^NA2  
   mo_ca = Sqr(cax * cax + cay * cay) bB6[Xj{  
   mo_cb = Sqr(cbx * cbx + cby * cby) s~L</Xvo  
   cos_acb = mo_jj / (mo_ca * mo_cb) PkUd~c  
   'ff_cos = cos_acb S
~yR5cb  
   If cos_acb >= 1 Then 7"2b H  
   nn = 0 |a(fejO3  
   ElseIf cos_acb <= -1 Then s"~5']8  
   nn = 3.14159265258979 nCnjq=  
   Else ]r/^9XaqtA  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) [r-}bp'Gp  
   End If }DjYGMrTB  
   'ff_angle = nn
Gi?_ujZR  
   ff_angle = nn * 180 / 3.14159265258979 %J7UP4  
End Function

'判断点在区域内函数 Af-UScD%G  
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 xBM>u,0.F  
Dim aob, boc, cod, doa, sum As Single LJTo\^*  
  If ppx = p1x And ppy = p1y Then cDkV;$  
     point_in = True i'HQQWd  
     Exit Function pV\YG B+  
  End If Va<eusl  
  If ppx = p2x And ppy = p2y Then /bVZ::A&_  
     point_in = True L36Yx7gT<  
     Exit Function `dkV_ O0  
  End If ig#r4nQ=  
   If ppx = p3x And ppy = p3y Then 2&LQg=O  
     point_in = True ][@F  
     Exit Function `C72sA{M.  
  End If @w9{5D4  
     1%
~ZRmd e  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 9U_ks[Qa  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) "M H6fF  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) UE0$ o?  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) _ -..~K.|  
    sum = aob + boc + cod + doa 2.I^Xf2  
    If 360.01 > sum And sum > 359.99 Then t%VDRZo7  
       point_in = True a:rX9-**  
    Else &)9{HRP  
       point_in = False /BA{O&Ro^  
    End If oF:v JDSS  
End Function

'得到点半径,得到交点坐标函数 0"WDH)7hJ  
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() A$/\1282  
    '求得中心点坐标 w`HI]{hE~N  
Dim tt As String R=)55qu  
Dim rt(3) As Single K7TzF&  
    '判断是否平行 r|<DqTc6l  
   acx = p3x - p1x *s4\\Wb=  
   acy = p3y - p1y 6cS>bl  
   bdx = p4x - p2x BzJ;%ywS  
   bdy = p4y - p2y .i"W8~<e  
   If acx * bdy = acy * bdx Then MHj,<|8Q  
      rt(0) = 0 f{#j6wZM  
      Exit Function `8_z!)  
   Else 0Rn+`UnwB  
      '判断斜率存在否 <X7\z  
      If p1x = p3x And p2x <> p4x Then k\r(=cex6  
         tt = "ac_n_bd_y" aG`;OgrH  
      ElseIf p1x <> p3x And p2x = p4x Then E;Y;r"  
         tt = "ac_y_bd_n" 1=}qBR#scY  
      ElseIf p1x <> p3x And p2x <> p4x Then xG2+(f#C1  
         tt = "ac_y_bd_y" AvJ,SQt  
      End If hcCp,b  
    Select Case tt Vy<HA*  
         Case "ac_n_bd_y" kJ:F *34e=  
            'bd线段方程 eet Q}]  
            k_bd = bdy / bdx d4?d4;{  
            b_bd = p2y - k_bd * p2x :nY
2O  
            p_x = p1x Y4.Eq+$gh  
            p_y = k_bd * p_x + b_bd '])2k@o@  
         Case "ac_y_bd_n" $(pF;_W  
            'ac线段方程 SGc8^%-`  
            k_ac = acy / acx F/d7q%I  
            b_ac = p1y - k_ac * p1x una%[jTc  
            p_x = p2x y@V_g'  
            p_y = k_ac * p_x + b_ac }G<T:(a  
        Case "ac_y_bd_y" &;T
J~r#K  
           'ac，bd线段都要求 n.oUVr=nX  
           k_ac = acy / acx Q^Ql
\  
           b_ac = p1y - k_ac * p1x !5@_j,lW(  
           k_bd = bdy / bdx Sw&!y$ed  
           b_bd = p2y - k_bd * p2x ?L) !pP]  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) ;TiUpg</_3  
           p_y = k_ac * p_x + b_ac [%A4]QzWh  
        End Select `Hx
~UH)  
      rt(1) = p_x y&[y=0!  
      rt(2) = p_y ~I}9;XT  
     "[p@tc?5  
'计算最大半径 .9[45][FK  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 7IlOG~DC  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) kUx&
pYv  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) Q:C$&-$  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 9Mp$8-=>7  
Dim bb(5) As Single gd/H``x|Y  
  bb(1) = rr1 DHC+C4  
  bb(2) = rr2 d'6|:z9c  
  bb(3) = rr3 VQI(Vp|  
  bb(4) = rr4 {%v-(  
  nb = rr1 x3ERCqTR  
For i = 1 To 4 f ).1]~  
    If nb <= bb(i) Then vP@v.6gS,  
       nb = bb(i) Dq@2-Cv  
    End If l&YKD,H};  
Next i *1Z5+uVT[  
    rt(0) = Sqr(nb) dBV7Te4L  
    rr = rt() S\6[EQ65  
  End If mnk"Vr` L  
         8.=\GV  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  7z\m; 1  

d1!i(MaV!  
有热压工艺方面的人才或者资料分享下； .%'(9E  
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 ,=(Z00#(  

高手真多！

楼主威武霸气.