[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： |v+z*}fKw  
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关键点说几个： NX\AQVy9  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 8#!g;`~ D  
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 ?j&hG|W9<z  
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 tR51Pw  

以下是几个重要的函数： 4dixHpq'  
1.判断点在区域中函数 ]x)!Kd2>  
2.计算夹角函数 Hn >VPz+I  
3.转置函数 aV5M}:D  
4.得到区域中心点，及区域半径函数 FS}b9sQ)  
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） Oj-\  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 M|c_P)7ym  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single $'KQP8M+  
   cax = x2 - x1 7;+G
)44  
   cay = y2 - y1 }E ]l4N2  
   cbx = x2 - x3 .@fA_8  
   cby = y2 - y3 (Yz[SK=U}  
   mo_jj = cax * cbx + cay * cby xc*a(v0  
   mo_ca = Sqr(cax * cax + cay * cay) *rTg>)  
   mo_cb = Sqr(cbx * cbx + cby * cby) MWme3u)D  
   cos_acb = mo_jj / (mo_ca * mo_cb) WowT!0$  
   'ff_cos = cos_acb #czTX%+9(e  
   If cos_acb >= 1 Then t Cb34Wpf  
   nn = 0 (s&:D`e  
   ElseIf cos_acb <= -1 Then %|e)s_%XE  
   nn = 3.14159265258979 /e"iYF  
   Else ~1;M4K  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) f I=G>[  
   End If S?CT6moXA  
   'ff_angle = nn *EGzFXa  
   ff_angle = nn * 180 / 3.14159265258979 (o*YGYC  
End Function

'判断点在区域内函数 W:
8MqVm34  
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 8Azh&c  
Dim aob, boc, cod, doa, sum As Single .mfLHN%:  
  If ppx = p1x And ppy = p1y Then IDn<5#  
     point_in = True fD@d
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     Exit Function h&K$(}X  
  End If B!pz0K*uG  
  If ppx = p2x And ppy = p2y Then \t)va:y  
     point_in = True 7)QZ<fme  
     Exit Function 3N$@K"qM#  
  End If 3"m]A/6C}  
   If ppx = p3x And ppy = p3y Then -XXsob}/8  
     point_in = True i=\)[;U  
     Exit Function C]2-V1,ZX  
  End If RAl/p9\A+  
     #WZat ?-N  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) %W9R08
`  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) )qb'tZz/g_  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) UstUPO  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) (Ff}Y.4  
    sum = aob + boc + cod + doa ~2\Sn-`  
    If 360.01 > sum And sum > 359.99 Then EA(4xj&:U  
       point_in = True ["f6Ern  
    Else MoN0w.V  
       point_in = False Wz.iDRFl  
    End If }O7sP^  
End Function

'得到点半径,得到交点坐标函数 VA[EY`8  
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() 2|^@=.4\  
    '求得中心点坐标 :.ZWYze  
Dim tt As String ,B'=$PO%  
Dim rt(3) As Single nfF$h}<o+  
    '判断是否平行 BJwuN  
   acx = p3x - p1x %Zk6K!MY#  
   acy = p3y - p1y <~
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   bdx = p4x - p2x I+H~ 5zq.  
   bdy = p4y - p2y iOg4(SPci  
   If acx * bdy = acy * bdx Then "W"^0To  
      rt(0) = 0 UgAp9$=z  
      Exit Function E;CM"Y*  
   Else uQ-GJI^t  
      '判断斜率存在否 "jyo'r  
      If p1x = p3x And p2x <> p4x Then ]TT >3"Dw7  
         tt = "ac_n_bd_y" {Ev
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W  
      ElseIf p1x <> p3x And p2x = p4x Then y@7fR9hp<  
         tt = "ac_y_bd_n" q  
      ElseIf p1x <> p3x And p2x <> p4x Then |&8XmexLb  
         tt = "ac_y_bd_y" zEFS\nP}E  
      End If nQmHYOF%  
    Select Case tt #4mRMsW5"  
         Case "ac_n_bd_y"
?)-6~p 4N  
            'bd线段方程 L0"|4=  
            k_bd = bdy / bdx r{v3XD/  
            b_bd = p2y - k_bd * p2x **%&|9He  
            p_x = p1x .4\I?  
            p_y = k_bd * p_x + b_bd b_RO%L:"yL  
         Case "ac_y_bd_n" BS fmS(.  
            'ac线段方程 %]}JWXof  
            k_ac = acy / acx  q6F1Rt  
            b_ac = p1y - k_ac * p1x D/Ki^E  
            p_x = p2x  Kg';[G\  
            p_y = k_ac * p_x + b_ac buX(mj:
&  
        Case "ac_y_bd_y" |K1S(m<F  
           'ac，bd线段都要求 Oq~{HJ{  
           k_ac = acy / acx m@XX2l9:9  
           b_ac = p1y - k_ac * p1x 1"Oe*@`pV  
           k_bd = bdy / bdx 6:G&x<{  
           b_bd = p2y - k_bd * p2x `.J)Z=o  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) g7]S  
           p_y = k_ac * p_x + b_ac ru 6`Z+p  
        End Select IrL7%?  
      rt(1) = p_x +@?Q"B5u}  
      rt(2) = p_y 8%CznAO"?W  
     *fc8M(]&d  
'计算最大半径 aeUgr!  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) QD,m`7(  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) 6ioj!w<N  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) ^slIR!L  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) b
\ED<'  
Dim bb(5) As Single _MC',p&  
  bb(1) = rr1 y[$UeE"0  
  bb(2) = rr2 }&=l)\e  
  bb(3) = rr3 `3\U9ZH23  
  bb(4) = rr4 qY8; k #  
  nb = rr1 }PK4 KRn  
For i = 1 To 4 {mD0ug  
    If nb <= bb(i) Then A^,ul>!  
       nb = bb(i) 3g!Z[SZ  
    End If )8oyo~4?  
Next i 0bh 6ay4  
    rt(0) = Sqr(nb) C&Q[[k"kb  
    rr = rt() kEq~M10  
  End If T3oFgzoO  
         []@@  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  n\Lsm  

k {{eyC  
有热压工艺方面的人才或者资料分享下； N:64Gko"K  
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 < (9 BO&  

高手真多！

楼主威武霸气.