[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： I~YV&12  
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图片:2.jpg

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关键点说几个： F;_o`h  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） fr04n
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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 K re*~ "  
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 SEg{Gso9b  

以下是几个重要的函数： a_[+id  
1.判断点在区域中函数 0LzS #J+  
2.计算夹角函数 ^qBm%R(  
3.转置函数 O0BDUpH  
4.得到区域中心点，及区域半径函数 4L`,G:J,;  
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） nTs\zikP  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 |pMP-  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single g}hNsU=$5~  
   cax = x2 - x1 qQo*:3/];  
   cay = y2 - y1 YbWz!.WPe  
   cbx = x2 - x3 Rw[!J
q  
   cby = y2 - y3 #_3-(H5u  
   mo_jj = cax * cbx + cay * cby JW2f 6!b  
   mo_ca = Sqr(cax * cax + cay * cay) .9g :-hv  
   mo_cb = Sqr(cbx * cbx + cby * cby) P$AHw;n[R  
   cos_acb = mo_jj / (mo_ca * mo_cb)  myOW^  
   'ff_cos = cos_acb A93(} V7I  
   If cos_acb >= 1 Then tId,Q>zH  
   nn = 0 |)O;+e\  
   ElseIf cos_acb <= -1 Then MDd2B9cy[  
   nn = 3.14159265258979 3qNuv];2  
   Else ?aTC+\=  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) g}9heR  
   End If Qch'C0u  
   'ff_angle = nn KlBT9"6"  
   ff_angle = nn * 180 / 3.14159265258979 =R9`to|  
End Function

'判断点在区域内函数 qCm%};yt  
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 `VglE?M  
Dim aob, boc, cod, doa, sum As Single 4Xn-L&0z  
  If ppx = p1x And ppy = p1y Then w>RwEU+w=@  
     point_in = True Gh%dVP9B@P  
     Exit Function :FS~T[C;  
  End If [,z>msEB.  
  If ppx = p2x And ppy = p2y Then {;JFoe+  
     point_in = True V`feUFw3  
     Exit Function Q b5vyV `  
  End If =}SC .E\  
   If ppx = p3x And ppy = p3y Then j(_6.zf  
     point_in = True
o O1Fw1Y  
     Exit Function %IUTi6P l  
  End If :+fW#:  
     Nb>C5TjR  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) a)/ }T  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) !T]bz+  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) jrYA5>=>#  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) {8~xFYc
:  
    sum = aob + boc + cod + doa 0INlo  
    If 360.01 > sum And sum > 359.99 Then DCSTp2  
       point_in = True P"+K'B7K3  
    Else l9NE
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       point_in = False `ItPTSOi  
    End If FK,YVY  
End Function

'得到点半径,得到交点坐标函数 Ap%tm)@1  
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() :*E#w"$,j  
    '求得中心点坐标 kQ $.g<  
Dim tt As String UE%~SVi.#  
Dim rt(3) As Single !XrnD#  
    '判断是否平行 L t.Vo  
   acx = p3x - p1x ZS?4<lXF  
   acy = p3y - p1y )?,X\/5  
   bdx = p4x - p2x 3Qoa?*  
   bdy = p4y - p2y tCP;IU$  
   If acx * bdy = acy * bdx Then p?4h2`P  
      rt(0) = 0 H7R6Ljd?&S  
      Exit Function p#fV|2'  
   Else Ni)/L( &  
      '判断斜率存在否 81/t)Cp  
      If p1x = p3x And p2x <> p4x Then a?X{k|;!7u  
         tt = "ac_n_bd_y" I'T@}{h  
      ElseIf p1x <> p3x And p2x = p4x Then "A%JT3  
         tt = "ac_y_bd_n" 9~C$C  
      ElseIf p1x <> p3x And p2x <> p4x Then 94xRKQ}  
         tt = "ac_y_bd_y" ~OQ/ |ws  
      End If QGQ}I  
    Select Case tt ~xP4}gs1  
         Case "ac_n_bd_y" S2EeC&-AR  
            'bd线段方程 h oL"
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            k_bd = bdy / bdx 2<' 1m{  
            b_bd = p2y - k_bd * p2x 3Zeh$DZ  
            p_x = p1x @{y[2M} %]  
            p_y = k_bd * p_x + b_bd f-/zR%s{  
         Case "ac_y_bd_n" WT9k85hqj  
            'ac线段方程 xxC2F:Q?U  
            k_ac = acy / acx exQU  
            b_ac = p1y - k_ac * p1x l^*'W(%  
            p_x = p2x  W.t`  
            p_y = k_ac * p_x + b_ac gu~F(Fb'  
        Case "ac_y_bd_y" h1`u-tc2x  
           'ac，bd线段都要求 G
h#$[5&`  
           k_ac = acy / acx %RF9R"t$  
           b_ac = p1y - k_ac * p1x P7`sJ("#  
           k_bd = bdy / bdx 2PrUI;J$  
           b_bd = p2y - k_bd * p2x &6
mXsx$  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) bF X0UE>  
           p_y = k_ac * p_x + b_ac +vh 4I  
        End Select bW9a_myE  
      rt(1) = p_x > R5<D'cEN  
      rt(2) = p_y Ckc4U. t|  
     4)XZ'~|  
'计算最大半径 sF`ELrR \  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) +7]]=e<[E  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) FnFJw;:
,{  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) o2C{V1nB  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) <$]=Vaq  
Dim bb(5) As Single utDjN"  
  bb(1) = rr1 wgb e7-{  
  bb(2) = rr2 sD[G?X  
  bb(3) = rr3 W"a%IO%'  
  bb(4) = rr4 :QV-!  
  nb = rr1 ta\CZp  
For i = 1 To 4 cU^Z=B  
    If nb <= bb(i) Then Pl}>  
       nb = bb(i) zFn-VEJ)  
    End If CPto?=*A  
Next i O_u2V'jy9  
    rt(0) = Sqr(nb) _4]GP3`  
    rr = rt() LR5X=&k  
  End If TNHkHR[&  
         X?'v FC  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  ,[64$=R8  

?B)jnBh|  
有热压工艺方面的人才或者资料分享下； duCso M/  
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 _K4Igq  

高手真多！

楼主威武霸气.