[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： qx 3.oU  
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图片:2.jpg

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关键点说几个： )xQxc.  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） ,2JqX>On>Y  
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 ;0E"4(S.q1  
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 qh$D;t1=  

以下是几个重要的函数： {\|? {8f  
1.判断点在区域中函数 L:Wy- Z  
2.计算夹角函数 1@)]+* F*z  
3.转置函数 SJU93n"G/  
4.得到区域中心点，及区域半径函数 CcY.8|HT  
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） #a#~YSnG  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 w2{k0MW  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single 7/Lbs  
   cax = x2 - x1 83R"!w18  
   cay = y2 - y1 ls*^3^O  
   cbx = x2 - x3 d,<ctd  
   cby = y2 - y3 KD,b.s  
   mo_jj = cax * cbx + cay * cby oPa2GW8  
   mo_ca = Sqr(cax * cax + cay * cay) S\0"G*  
   mo_cb = Sqr(cbx * cbx + cby * cby) U^pe/11)H  
   cos_acb = mo_jj / (mo_ca * mo_cb) IR/0gP  
   'ff_cos = cos_acb nWXI*%m5  
   If cos_acb >= 1 Then K:'pK1zy  
   nn = 0 &)s A(  
   ElseIf cos_acb <= -1 Then ?'T>/<(  
   nn = 3.14159265258979 Kjz,p^Y\  
   Else ?-@hNrx  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1)  g<,v2A  
   End If ;/oMH/,U8  
   'ff_angle = nn ZLL0 6p   
   ff_angle = nn * 180 / 3.14159265258979 AO']Kmm  
End Function

'判断点在区域内函数 |;D[Al5AMc  
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 i}wu+<Mk  
Dim aob, boc, cod, doa, sum As Single PFPfLxna  
  If ppx = p1x And ppy = p1y Then H[>_LYZ8  
     point_in = True }1_gemlf  
     Exit Function .mok.f<G_m  
  End If MH !CzV&  
  If ppx = p2x And ppy = p2y Then 5lU`o  
     point_in = True @F,HyCSN  
     Exit Function tY[y?DJ  
  End If m2_&rjGz  
   If ppx = p3x And ppy = p3y Then q>Q|:g&:  
     point_in = True pM#:OlqC  
     Exit Function }*R"yp  
  End If K/%aoTO}  
     |_w*:NCV5  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) w:um
r#  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) " g_\W  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) "\>3mVOb  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) *K+*0_  
    sum = aob + boc + cod + doa o1n c.2/0J  
    If 360.01 > sum And sum > 359.99 Then 5mFi)0={y  
       point_in = True ZnJnjW PQ  
    Else =r_ SMTu  
       point_in = False l|&|+u#  
    End If ^)fB "!s  
End Function

'得到点半径,得到交点坐标函数 >K &b,o,[  
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() {K|{a  
    '求得中心点坐标 #JW1JCT  
Dim tt As String zc2,Mn2  
Dim rt(3) As Single Zv-6H*zM6  
    '判断是否平行 nB:Bw8U"Q  
   acx = p3x - p1x tjTF?>^6|  
   acy = p3y - p1y RV($G8U  
   bdx = p4x - p2x }>OE"#si  
   bdy = p4y - p2y >)5vsqGZaK  
   If acx * bdy = acy * bdx Then ~z'0~3  
      rt(0) = 0 H~$|y9>qI  
      Exit Function =k8
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   Else P,%|(qB
  
      '判断斜率存在否 R1wdQ8q  
      If p1x = p3x And p2x <> p4x Then "Km`B1f`  
         tt = "ac_n_bd_y" h5Z\9`f[  
      ElseIf p1x <> p3x And p2x = p4x Then S\X_!|  
         tt = "ac_y_bd_n" 3{c&%F~!  
      ElseIf p1x <> p3x And p2x <> p4x Then ~j4=PT  
         tt = "ac_y_bd_y" .K93VTzy  
      End If s e1ipn_A  
    Select Case tt au7BqV!uL  
         Case "ac_n_bd_y" y7w>/7
q  
            'bd线段方程 Q3KBG8  
            k_bd = bdy / bdx DBv5Og  
            b_bd = p2y - k_bd * p2x "*T)L<G  
            p_x = p1x },"g*  
            p_y = k_bd * p_x + b_bd `C()H@;  
         Case "ac_y_bd_n" L{Th>]X  
            'ac线段方程 y~dW=zO  
            k_ac = acy / acx *PI3
L/*  
            b_ac = p1y - k_ac * p1x D H.ljGb  
            p_x = p2x [Ytia#Vv  
            p_y = k_ac * p_x + b_ac %*/[aq,#  
        Case "ac_y_bd_y" ._R82gy  
           'ac，bd线段都要求 3a5H<3w_  
           k_ac = acy / acx :{AN@zC0\  
           b_ac = p1y - k_ac * p1x ]MHQ"E?
  
           k_bd = bdy / bdx $wN.~"T  
           b_bd = p2y - k_bd * p2x 7]^Cg;EtM:  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) eGE%c1H9a  
           p_y = k_ac * p_x + b_ac |'J3"am'  
        End Select hh?'tb{  
      rt(1) = p_x =?2y <B  
      rt(2) = p_y lfKknp#B/O  
     p<+]+,|\~:  
'计算最大半径 /qCYNwWH9  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) H{V-C_  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) m0edkt-x  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) hw7_8pAbh  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) lAGxE-B^a"  
Dim bb(5) As Single {NFeX'5bP  
  bb(1) = rr1 22
6s:\d  
  bb(2) = rr2 G'epsD,.bX  
  bb(3) = rr3 lt*k(JD  
  bb(4) = rr4 7q?YdAUz  
  nb = rr1 *K)v&}uw  
For i = 1 To 4 c`>\R<Z ]  
    If nb <= bb(i) Then :X!(^a;]  
       nb = bb(i) Q?>#sN,  
    End If Y!`?q8z$G  
Next i }/LYI  
    rt(0) = Sqr(nb) XXF9oy8  
    rr = rt() zZxP= c  
  End If Za} |Ee  
         ke%zp-2c
 
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  WS/+Yl  

ewG21 q$  
有热压工艺方面的人才或者资料分享下； fB96Q  
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 uq%3;#[0  

高手真多！

楼主威武霸气.