[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： mcbvB5U  
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关键点说几个： l;F\s&^  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） CYkU-  
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 d'p]F~a
 
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 \mGx-g6  

以下是几个重要的函数： !]#@:Z  
1.判断点在区域中函数 ,$4f#)  
2.计算夹角函数 %X|fp{C  
3.转置函数 Hsdcv~Xr;l  
4.得到区域中心点，及区域半径函数 D5Z@6RVt  
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） E}qW'  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 LdH23\  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single R(t1Ei.-?  
   cax = x2 - x1 6x*$/1'M3;  
   cay = y2 - y1 jx=5E6(h  
   cbx = x2 - x3 a62'\wF>D
 
   cby = y2 - y3 yhPO$L  
   mo_jj = cax * cbx + cay * cby S' <X)  
   mo_ca = Sqr(cax * cax + cay * cay) @r130eLh  
   mo_cb = Sqr(cbx * cbx + cby * cby) #q
nK nxD  
   cos_acb = mo_jj / (mo_ca * mo_cb) 7=wPd4  
   'ff_cos = cos_acb p~A6:"8s`=  
   If cos_acb >= 1 Then vB?(|  
   nn = 0 7;8DKY q  
   ElseIf cos_acb <= -1 Then nSSj&q-O  
   nn = 3.14159265258979 S Boi|  
   Else {SRv=g  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) j9sLR  
   End If W Te1E,M  
   'ff_angle = nn O$*\JL  
   ff_angle = nn * 180 / 3.14159265258979 hy}n&h  
End Function

'判断点在区域内函数 95IR.Qfn!  
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 ?y|8bw<  
Dim aob, boc, cod, doa, sum As Single 3E$h W  
  If ppx = p1x And ppy = p1y Then FdE9k\E#/)  
     point_in = True +\GuZ5`  
     Exit Function gk^`-`P  
  End If s~b!3l`gu  
  If ppx = p2x And ppy = p2y Then j"4]iI+{"  
     point_in = True 1\LK[tvh  
     Exit Function XTKAy;'5  
  End If SrT=XX,  
   If ppx = p3x And ppy = p3y Then *USzzLq  
     point_in = True N 6t`45  
     Exit Function +9NI=s6  
  End If eFz!`a^dX  
     j\%m6\{n|  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y)  KrqO7  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) |QO)xEn~  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) feA(Rj  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) @sG5Do  
    sum = aob + boc + cod + doa IWNIk9T,u  
    If 360.01 > sum And sum > 359.99 Then pcO{%]?p  
       point_in = True mKZ^FgG  
    Else )#0Llx!  
       point_in = False :}+m[g  
    End If F m$;p6&j  
End Function

'得到点半径,得到交点坐标函数 nH(Hk%~  
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() od`:w[2\  
    '求得中心点坐标 O/{W:hJjd  
Dim tt As String 2@+MT z  
Dim rt(3) As Single I3D#wXW  
    '判断是否平行 m9li%p  
   acx = p3x - p1x ("rIz8b  
   acy = p3y - p1y Fwfe5`9'  
   bdx = p4x - p2x % ovk}}%;  
   bdy = p4y - p2y 7).zed^  
   If acx * bdy = acy * bdx Then  !#Hca  
      rt(0) = 0 <#5`%sa '  
      Exit Function n$YCIW)0  
   Else ?Ulc`-d  
      '判断斜率存在否 sAKQ.8$h*  
      If p1x = p3x And p2x <> p4x Then & wG3RR|  
         tt = "ac_n_bd_y" Q=cbHDB  
      ElseIf p1x <> p3x And p2x = p4x Then G##^xFx  
         tt = "ac_y_bd_n" xrky5[XoD  
      ElseIf p1x <> p3x And p2x <> p4x Then Gj(UA1~1  
         tt = "ac_y_bd_y" D[iIj_CKQ  
      End If hR3Pa'/i  
    Select Case tt $[-{Mm  
         Case "ac_n_bd_y" p!w}hB598  
            'bd线段方程 +6v;(] y  
            k_bd = bdy / bdx Y'S9   
            b_bd = p2y - k_bd * p2x l5d> YTK+5  
            p_x = p1x 2\1\Jn#q  
            p_y = k_bd * p_x + b_bd L~~Dj:%uq  
         Case "ac_y_bd_n" !WReThq  
            'ac线段方程 Ch9A6?=Hj8  
            k_ac = acy / acx `L
<)9*  
            b_ac = p1y - k_ac * p1x gDJ@s   
            p_x = p2x ,9;d"ce  
            p_y = k_ac * p_x + b_ac w_ po47S4  
        Case "ac_y_bd_y" ,*$/2nB^  
           'ac，bd线段都要求 hT<:)MG)+K  
           k_ac = acy / acx _*w}"\4_  
           b_ac = p1y - k_ac * p1x b1{XGK'  
           k_bd = bdy / bdx lt&30nf=  
           b_bd = p2y - k_bd * p2x f3]u-e'b  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) dLek4q `l  
           p_y = k_ac * p_x + b_ac "UY.; P  
        End Select 7F{=bL  
      rt(1) = p_x FE/2.!]&o  
      rt(2) = p_y iAlFgOk'  
     AH(O"v`  
'计算最大半径 xR,;^R|C  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 8@a|~\3-  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) WxS=Aip'  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) ~Zd n#z\  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) \T_?<t,UT  
Dim bb(5) As Single S hM}w/4  
  bb(1) = rr1 vAE?^*F  
  bb(2) = rr2 fV.43E  
  bb(3) = rr3 9h6
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  bb(4) = rr4 rHtT>UE=  
  nb = rr1 h;KI2k_^  
For i = 1 To 4 r_Rjjo  
    If nb <= bb(i) Then ab 1\nzpd  
       nb = bb(i) 'c<@SVF{Zz  
    End If /m;w~-N  
Next i EN%Xs578  
    rt(0) = Sqr(nb) []Z| *+=Q  
    rr = rt() [vaG{4m  
  End If *X;g Y  
         ;61m  
End Function

高手啊.人才啊.

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

bvu` =  
有热压工艺方面的人才或者资料分享下； aYj3a;EmU  
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 NM8F  

高手真多！

楼主威武霸气.