[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： -_O jiQR  
P^<to(|  

描述:请输入描述

图片:2.jpg

~sq@^<M)s  

关键点说几个： :)&vf<JL  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） KCH`=lX  
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 ~03M
H'  
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 TZ!@IBu  

以下是几个重要的函数： *v?kp>O  
1.判断点在区域中函数 ["4Tn0g ;  
2.计算夹角函数 {Qn{w%!|  
3.转置函数 !]RSG^%s{  
4.得到区域中心点，及区域半径函数 )?c,&  
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） ;-;lM6zP  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 c"pOi&  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single het<#3Bo  
   cax = x2 - x1 ?:-:m'jdU  
   cay = y2 - y1 "Aw)0a[j1  
   cbx = x2 - x3 AQT_s9"0  
   cby = y2 - y3 L[,19;(  
   mo_jj = cax * cbx + cay * cby cDE5/!  
   mo_ca = Sqr(cax * cax + cay * cay) ^NRf  
   mo_cb = Sqr(cbx * cbx + cby * cby) 22U`1AD3U  
   cos_acb = mo_jj / (mo_ca * mo_cb) XoL DqN!  
   'ff_cos = cos_acb 
Pd(_  
   If cos_acb >= 1 Then FF!PmfF'  
   nn = 0 5b*kn
N>  
   ElseIf cos_acb <= -1 Then <JU3sXl  
   nn = 3.14159265258979 o)^
Wz  
   Else :."oWqb)  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) Q~VM.G  
   End If 2Q5@2jT  
   'ff_angle = nn nJ xO.wWE  
   ff_angle = nn * 180 / 3.14159265258979 & d2`{H  
End Function

'判断点在区域内函数 MGt>:&s(]  
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 O=(F46 M  
Dim aob, boc, cod, doa, sum As Single &ah%^Z4um  
  If ppx = p1x And ppy = p1y Then >7%T%2N  
     point_in = True Ve&_NVPrd  
     Exit Function ?4Rd4sIM$u  
  End If m m`#v g,  
  If ppx = p2x And ppy = p2y Then "QxULiw  
     point_in = True !$oa6*<1  
     Exit Function =\5WYC  
  End If >RAg63!`  
   If ppx = p3x And ppy = p3y Then tHZ"o!(S  
     point_in = True fx[&"$X  
     Exit Function tZz
%x?3G  
  End If >(S)aug$1  
     10*Tk 8  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) /pPHD]  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) h\w;SDwOk  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) RO,TNS~  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) H>%AK'

'  
    sum = aob + boc + cod + doa &{a!)I>  
    If 360.01 > sum And sum > 359.99 Then Y$A2{RjRq  
       point_in = True ['.])  
    Else MyllL@kP  
       point_in = False iBSg`"S^]C  
    End If c&',#.9  
End Function

'得到点半径,得到交点坐标函数 v7wyQx+Q  
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() 'kt6%d2  
    '求得中心点坐标 xsj,l@Ey  
Dim tt As String ]$r]GVeN}H  
Dim rt(3) As Single nLz;L r!  
    '判断是否平行 Qr$ 7 U6
p  
   acx = p3x - p1x `D~oY=  
   acy = p3y - p1y x-CjxU3  
   bdx = p4x - p2x ~^Cx->l  
   bdy = p4y - p2y bXF8V  
   If acx * bdy = acy * bdx Then Kgr<OL}VJ  
      rt(0) = 0 ZY`9  
      Exit Function q| 1%G Nb  
   Else -EP1Rl`\  
      '判断斜率存在否 Su6kpC!EW  
      If p1x = p3x And p2x <> p4x Then )2?]c  
         tt = "ac_n_bd_y" Yu_*P-Ja6  
      ElseIf p1x <> p3x And p2x = p4x Then qm!oJL  
         tt = "ac_y_bd_n" mB_?N $K  
      ElseIf p1x <> p3x And p2x <> p4x Then ~ O#\$u  
         tt = "ac_y_bd_y" Cy$~H  
      End If #C&';HB;y  
    Select Case tt FXJ0 G>F  
         Case "ac_n_bd_y" hHJvLs>^  
            'bd线段方程 9m$"B*&6G  
            k_bd = bdy / bdx ?5n
EmG|kO  
            b_bd = p2y - k_bd * p2x q=5aHH% |  
            p_x = p1x <|_>r`@%l  
            p_y = k_bd * p_x + b_bd ,W)DQwAg  
         Case "ac_y_bd_n" ~F'6k&A^q  
            'ac线段方程 k}fC58q  
            k_ac = acy / acx %"mI["{  
            b_ac = p1y - k_ac * p1x JHa1lj  
            p_x = p2x auK9wQ%\  
            p_y = k_ac * p_x + b_ac  YFm%W@  
        Case "ac_y_bd_y" giNXXjl  
           'ac，bd线段都要求 azv173XZ  
           k_ac = acy / acx _D{A`z  
           b_ac = p1y - k_ac * p1x Gkuqe3

 
           k_bd = bdy / bdx >o1dc*  
           b_bd = p2y - k_bd * p2x u.X]K:Yow  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) <?7qI85OT  
           p_y = k_ac * p_x + b_ac -z`FKej   
        End Select \[3~*eX6  
      rt(1) = p_x v3Vve:}+  
      rt(2) = p_y EO)JMV?6  
     "D.<~!  
'计算最大半径 +=E\sEe  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) D8L5t<^1R  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) yR>
P  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) R%RbC!P  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) Wf3BmkZzz  
Dim bb(5) As Single Y`j$7!j  
  bb(1) = rr1 H^n@9U;[K
 
  bb(2) = rr2 h^=;
\ng1l  
  bb(3) = rr3 .S54:vs  
  bb(4) = rr4 rt*x[5<  
  nb = rr1 2(DhKHrF  
For i = 1 To 4 #E!^oZm<Z  
    If nb <= bb(i) Then +S4>}2N33  
       nb = bb(i) YgcW1}  
    End If ,1mL=|na  
Next i r=n{3o+  
    rt(0) = Sqr(nb) 6o#/[Tz  
    rr = rt() 3Sfd|0^  
  End If 5]Rbzg2t  
         p}!i_P  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  
p[P#!  

7~P2q/2E>  
有热压工艺方面的人才或者资料分享下； ;j1 SSHZ  
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 -*mbalU,J  

高手真多！

楼主威武霸气.