[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： f$dIPt(  
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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： f3>DmH#  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） :B7U),T  
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 2hryY  
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 oQo5y_o~  

以下是几个重要的函数： F=#V/ #ia  
1.判断点在区域中函数 \W= qqE]  
2.计算夹角函数 :IfwhI)  
3.转置函数 L$kB(Brw  
4.得到区域中心点，及区域半径函数 rQU6*f  
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） qn |~YXn  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 >V]9<*c  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single S3E5^n\\  
   cax = x2 - x1 n5IQKYrg  
   cay = y2 - y1 %k )H7nj  
   cbx = x2 - x3 D&~%w!  
   cby = y2 - y3 $z 5kA9  
   mo_jj = cax * cbx + cay * cby M:iH7K  
   mo_ca = Sqr(cax * cax + cay * cay) wp> z04  
   mo_cb = Sqr(cbx * cbx + cby * cby) ~vM99hW  
   cos_acb = mo_jj / (mo_ca * mo_cb) 1)zXv  
   'ff_cos = cos_acb jF/S2Ty2  
   If cos_acb >= 1 Then f:J-X~T_f  
   nn = 0 W}MN-0  
   ElseIf cos_acb <= -1 Then v=cQ`nou  
   nn = 3.14159265258979 `r~3Pf).4  
   Else "dvo@n|  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) +"=yd
F.9  
   End If S9r+Nsn  
   'ff_angle = nn .q[}e);)  
   ff_angle = nn * 180 / 3.14159265258979 ylQj2B,CB  
End Function

'判断点在区域内函数 ]t`SCsoo  
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 h0g?=hJq  
Dim aob, boc, cod, doa, sum As Single YhS_ ,3E  
  If ppx = p1x And ppy = p1y Then JPng !tvR  
     point_in = True p:W]  
     Exit Function h&}iH  
  End If TO"Md["GI  
  If ppx = p2x And ppy = p2y Then y)CvlI  
     point_in = True _*Z3,*~"X  
     Exit Function TB+k[UxB  
  End If N~l*//Ep  
   If ppx = p3x And ppy = p3y Then IOdxMzF`m  
     point_in = True }f?[m&<  
     Exit Function QKlsBq  
  End If NX.5u8Pf  
     BK6 X)1R  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) q^Oj/ws  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 9!W$S[ABRB  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) |('o g*
$  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) IM/xBP  
    sum = aob + boc + cod + doa PoPR34]^J  
    If 360.01 > sum And sum > 359.99 Then vgD
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       point_in = True =|ODa/2p  
    Else .SER,],P  
       point_in = False )Se$N6u-  
    End If 6L$KMYHE  
End Function

'得到点半径,得到交点坐标函数 vszm9Qf
  
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() 7H< IO`  
    '求得中心点坐标 .O5V;&,
  
Dim tt As String 'o#oRK{#  
Dim rt(3) As Single p'2IlQ\  
    '判断是否平行 f'@ L|&w  
   acx = p3x - p1x P@vUQ
 
   acy = p3y - p1y ".(vR7u'  
   bdx = p4x - p2x Wtcib-  
   bdy = p4y - p2y d-+jb<C&  
   If acx * bdy = acy * bdx Then &s vg<UZ  
      rt(0) = 0 DR}I+<*%aD  
      Exit Function b&&l  
   Else B#jnM~fJz  
      '判断斜率存在否 uMZ~[Sz  
      If p1x = p3x And p2x <> p4x Then n>j2$m1[  
         tt = "ac_n_bd_y" ; /K6U  
      ElseIf p1x <> p3x And p2x = p4x Then *S:~U  
         tt = "ac_y_bd_n" <a @7's  
      ElseIf p1x <> p3x And p2x <> p4x Then Z6i~Dy3  
         tt = "ac_y_bd_y" J*$%d1  
      End If iKJqMES  
    Select Case tt ~at@3j}W  
         Case "ac_n_bd_y" aPEI_P+Ls  
            'bd线段方程 $a*7Q~4  
            k_bd = bdy / bdx n2B%}LLa  
            b_bd = p2y - k_bd * p2x I\k<PglRA  
            p_x = p1x X%IqZ{{  
            p_y = k_bd * p_x + b_bd 5buW\_G)  
         Case "ac_y_bd_n" bkDVW  
            'ac线段方程 C:t>u..  
            k_ac = acy / acx ^py=]7[I  
            b_ac = p1y - k_ac * p1x 0HoHu*+FX  
            p_x = p2x /)Cfm1$ic  
            p_y = k_ac * p_x + b_ac [_(J8~va  
        Case "ac_y_bd_y" S=!WFKcJR  
           'ac，bd线段都要求 }]o8}$&(  
           k_ac = acy / acx ]wU/yc)e  
           b_ac = p1y - k_ac * p1x lTMY|{9  
           k_bd = bdy / bdx HdqB B
  
           b_bd = p2y - k_bd * p2x .s*N1 U?h  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) ?o;ip  
           p_y = k_ac * p_x + b_ac [:cD  
        End Select bt)C+|i  
      rt(1) = p_x : "|/  
      rt(2) = p_y *O~y6|U?  
     <.n,:ir  
'计算最大半径 EyA ny\"  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) M0fN[!*z  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) qS/}aDk&  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) iF^qbh%%E  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) nD BWm`kN  
Dim bb(5) As Single N<rq}^qo  
  bb(1) = rr1 -K=.A*}  
  bb(2) = rr2 9Q4{ cB  
  bb(3) = rr3 K'Ywv@  
  bb(4) = rr4 0>BxS9?w  
  nb = rr1 A r]*?:4y[  
For i = 1 To 4 FE!jN-#  
    If nb <= bb(i) Then MrHJ)x"hy  
       nb = bb(i) :6nD"5(  
    End If gvuv>A}vJ  
Next i LVB wWlJ  
    rt(0) = Sqr(nb) q8d](MaX  
    rr = rt() kJ5z['4?  
  End If .8|wc  
         p6<JpW5@_  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  d/9YtG%q  

#sc!H4  
有热压工艺方面的人才或者资料分享下； 1M&Lb.J6  
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 {ze69 h  

高手真多！

楼主威武霸气.