[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： Mhf5bN|wQ  
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图片:2.jpg

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关键点说几个： )E@.!Ut4o  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） z] PS
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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 A) %/[GD2  
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 xU>WEm2  

以下是几个重要的函数： i,E{f  
1.判断点在区域中函数 NI}yVV  
2.计算夹角函数 K>r,(zgVc  
3.转置函数 5k3b3&  
4.得到区域中心点，及区域半径函数 l7259Ro~  
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） zH4D8@[7O  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 *1 ]uH e  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single 3yY}04[9<  
   cax = x2 - x1 D},>mfzF  
   cay = y2 - y1 D>@I+4{p  
   cbx = x2 - x3 ?WUA`/[z  
   cby = y2 - y3 tl4V7!U@^z  
   mo_jj = cax * cbx + cay * cby 1onM j  
   mo_ca = Sqr(cax * cax + cay * cay) ^f &XQQY  
   mo_cb = Sqr(cbx * cbx + cby * cby) :O?MSS;~  
   cos_acb = mo_jj / (mo_ca * mo_cb) dh*ZKI^@(  
   'ff_cos = cos_acb yw[g!W  
   If cos_acb >= 1 Then t#/YN.@r  
   nn = 0 a %'the  
   ElseIf cos_acb <= -1 Then u\x}8pn  
   nn = 3.14159265258979 ?)?Ng}  
   Else Ic:(Gi- %  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 2c,9e`  
   End If /y#f3r+*2  
   'ff_angle = nn gJXq^~-hd  
   ff_angle = nn * 180 / 3.14159265258979 y$F'(b|)  
End Function

'判断点在区域内函数 ksqQM
 
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 p* (JjH  
Dim aob, boc, cod, doa, sum As Single Nk 8B_{  
  If ppx = p1x And ppy = p1y Then B+VubUPMS  
     point_in = True Mj?`j_X  
     Exit Function g i-$ZFzB  
  End If ]G=L=D^cK  
  If ppx = p2x And ppy = p2y Then ufZDF=$
7  
     point_in = True '$IKtM`L  
     Exit Function F>6|3bOR  
  End If x0D*U?A  
   If ppx = p3x And ppy = p3y Then VUGmi]qd  
     point_in = True _|\~q[ep  
     Exit Function \?ZB]*Fu  
  End If |A9F\A->4  
     T_ <@..C  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) @#>rYAb8,  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) ~i{(<.he  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) -1_)LO&H  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 7~%?
#  
    sum = aob + boc + cod + doa f=Gg9bnm3  
    If 360.01 > sum And sum > 359.99 Then ")5":V~fN  
       point_in = True T#Z^s~7&I  
    Else ,vawzq[oSy  
       point_in = False 1..+F0U  
    End If 9Cp-qA%t  
End Function

'得到点半径,得到交点坐标函数 mb3"U"ohs  
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() |O+H[;TB6  
    '求得中心点坐标 'n]w"]|  
Dim tt As String >J?fl8  
Dim rt(3) As Single @)M9IOR  
    '判断是否平行 [Ek7b*  
   acx = p3x - p1x >dD@j:Qc  
   acy = p3y - p1y FUb\e-Q=  
   bdx = p4x - p2x ~P,lz!he_  
   bdy = p4y - p2y n\D&!y[]F  
   If acx * bdy = acy * bdx Then e}7lBLK]*  
      rt(0) = 0 <w9JRpFY  
      Exit Function xn(kKB.  
   Else @ioJ]$o7  
      '判断斜率存在否 g%I"U>!2  
      If p1x = p3x And p2x <> p4x Then $6 9&O  
         tt = "ac_n_bd_y" lU\[aNs  
      ElseIf p1x <> p3x And p2x = p4x Then 50wulGJud  
         tt = "ac_y_bd_n"
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      ElseIf p1x <> p3x And p2x <> p4x Then !hy-L_wL]  
         tt = "ac_y_bd_y" MrFQ5:=  
      End If }C?'
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    Select Case tt Tv=mgH=b  
         Case "ac_n_bd_y" P>D)7V9Hh  
            'bd线段方程 [yQt^!;  
            k_bd = bdy / bdx 783,s_  
            b_bd = p2y - k_bd * p2x TDjm2R~9FS  
            p_x = p1x ]p GL`ge5  
            p_y = k_bd * p_x + b_bd aFm_;\  
         Case "ac_y_bd_n" $( kF#  
            'ac线段方程 q3N jky1w  
            k_ac = acy / acx P|E| $)m  
            b_ac = p1y - k_ac * p1x "Gzz4D  
            p_x = p2x v{N`.~,^  
            p_y = k_ac * p_x + b_ac *OsQ}onv  
        Case "ac_y_bd_y" Y\P8v  
           'ac，bd线段都要求 M FMs[+2_o  
           k_ac = acy / acx 3(N$nsi  
           b_ac = p1y - k_ac * p1x cwlRQzQ(  
           k_bd = bdy / bdx &PHTpkaam  
           b_bd = p2y - k_bd * p2x \?-<4Bc@  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) _J#zY-j  
           p_y = k_ac * p_x + b_ac o5PO=AN  
        End Select Q&tG4f<  
      rt(1) = p_x lrE5^;/s1  
      rt(2) = p_y GL}]y -f  
     3;9^  
'计算最大半径 +TL%-On  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) JPHL#sKyz  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) ~G&dqw/.-U  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) Dml;#'IF3  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) u c)eil  
Dim bb(5) As Single EME|k{W  
  bb(1) = rr1 _N cR)2  
  bb(2) = rr2 RbnVL$c  
  bb(3) = rr3 YkSl^j[DHs  
  bb(4) = rr4 t{9GVLZ  
  nb = rr1 v{4$D~I  
For i = 1 To 4 T?
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    If nb <= bb(i) Then |wMN}bq|T  
       nb = bb(i) %wy.TN  
    End If Nai2W<,  
Next i qe#tj/aZ  
    rt(0) = Sqr(nb) ,&.!?0+  
    rr = rt() ;$|nrwhy  
  End If 'IQ0{&EI  
         /{_:{G!Q0  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  G 3ptx! D  

+M/%+l  
有热压工艺方面的人才或者资料分享下； @q)d  
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 YT,{E,U;  

高手真多！

楼主威武霸气.