[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： /BQB7v
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关键点说几个： 8$~^-_>n/  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） FnWN]9  
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 r>_40+|&  
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 m'PU0x  

以下是几个重要的函数： ?^gq  
1.判断点在区域中函数 :um]a70  
2.计算夹角函数 l>*L Am5  
3.转置函数 C0gO^A.d  
4.得到区域中心点，及区域半径函数 K:q|M?_  
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） 3,yzRb  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 e]*@|e
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Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single S0w:R:q}L  
   cax = x2 - x1 XsGc!o  
   cay = y2 - y1 \rM5@ Vf  
   cbx = x2 - x3 $ww0$  
   cby = y2 - y3 y`\rb<AZ*t  
   mo_jj = cax * cbx + cay * cby H(tT8Q5i  
   mo_ca = Sqr(cax * cax + cay * cay) i\dd  
   mo_cb = Sqr(cbx * cbx + cby * cby) r!;wKO  
   cos_acb = mo_jj / (mo_ca * mo_cb) ^l{q{O7U$  
   'ff_cos = cos_acb x5R|,bY  
   If cos_acb >= 1 Then KsQn%mxS  
   nn = 0 I~Q G  
   ElseIf cos_acb <= -1 Then 2= zw!  
   nn = 3.14159265258979 uc Ph*M  
   Else "sYZ3  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 3
c+ps;nh  
   End If gMsB1|  
   'ff_angle = nn TjS
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   ff_angle = nn * 180 / 3.14159265258979 >';UF;\5]Q  
End Function

'判断点在区域内函数 Zp/$:ny  
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 LZDJ\"a-  
Dim aob, boc, cod, doa, sum As Single 0i(c XB  
  If ppx = p1x And ppy = p1y Then yof8LWXx  
     point_in = True 2  Z
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     Exit Function *uoO#4g~  
  End If rV}&G!V_t  
  If ppx = p2x And ppy = p2y Then *t
fD^nctO  
     point_in = True D2I|Z  
     Exit Function dOVu D(  
  End If OMAvJzK .  
   If ppx = p3x And ppy = p3y Then Jwpc8MQ  
     point_in = True 1E=E ?$9sg  
     Exit Function o37D~V;  
  End If BS3{TGn  
     5zz">-Q !  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 1Gy [^  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) U|Uc|6  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) w+$~ds  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 9.BgsV .  
    sum = aob + boc + cod + doa xdh%mG:?  
    If 360.01 > sum And sum > 359.99 Then +F*h\4ry#  
       point_in = True u.Tknw-X  
    Else zUq(bD  
       point_in = False -vv_6ZL[  
    End If {E0\mZ2  
End Function

'得到点半径,得到交点坐标函数 GT\yjrCd  
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() A0OA7m:~4  
    '求得中心点坐标 }<zbx*!  
Dim tt As String [^D>xD3B2  
Dim rt(3) As Single Bg}l$?S  
    '判断是否平行 33&l.[A"!}  
   acx = p3x - p1x +X`&VO6~  
   acy = p3y - p1y Ze <)B *  
   bdx = p4x - p2x >!Xj%RW  
   bdy = p4y - p2y o]]sm}3N  
   If acx * bdy = acy * bdx Then *Q
#oV}D_  
      rt(0) = 0 @$iZ9x6t  
      Exit Function m&s>Sn+  
   Else P-<1vfThH  
      '判断斜率存在否 U8-OQ:2.  
      If p1x = p3x And p2x <> p4x Then u%lUi2P2E  
         tt = "ac_n_bd_y" @v3)N[|d  
      ElseIf p1x <> p3x And p2x = p4x Then ydA@@C\&  
         tt = "ac_y_bd_n" O3mw5<%15  
      ElseIf p1x <> p3x And p2x <> p4x Then )5n:UD{f[#  
         tt = "ac_y_bd_y" (UCCEQq5  
      End If I9m9`4BK  
    Select Case tt [$td:N *  
         Case "ac_n_bd_y" mn\A)RQ  
            'bd线段方程 I@\D tQZ
 
            k_bd = bdy / bdx R+_!FnOJ  
            b_bd = p2y - k_bd * p2x bZr,jLEf  
            p_x = p1x n_:EWm$\  
            p_y = k_bd * p_x + b_bd v+}${h9  
         Case "ac_y_bd_n" e=aU9v L  
            'ac线段方程 wS+!>Q_]w  
            k_ac = acy / acx /DP0K @%  
            b_ac = p1y - k_ac * p1x g*`xEb='  
            p_x = p2x hn\d{HP  
            p_y = k_ac * p_x + b_ac .Z#/%y3S  
        Case "ac_y_bd_y" qHtIjtt[q  
           'ac，bd线段都要求 R$66F>Jz^  
           k_ac = acy / acx wX_~H*m?  
           b_ac = p1y - k_ac * p1x t&NpC;>v  
           k_bd = bdy / bdx B?yjU[/R  
           b_bd = p2y - k_bd * p2x M< .1U?_#  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) NqGSoOjIO2  
           p_y = k_ac * p_x + b_ac I>##iiKN  
        End Select Od^Sr4C  
      rt(1) = p_x Z`86YYGK  
      rt(2) = p_y [S8*b^t4  
     S4?WR+:h  
'计算最大半径 U=7nz|  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) @rAV;D%  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) aC%Q.+-t  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) aEh9za  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 8e^uKYR<  
Dim bb(5) As Single .gzfaxi  
  bb(1) = rr1 ekU%^R<  
  bb(2) = rr2 SH#*Lc   
  bb(3) = rr3 M] +.xo+A  
  bb(4) = rr4 vU5}E\Ny  
  nb = rr1 VumM`SH  
For i = 1 To 4 iK+Vla`}  
    If nb <= bb(i) Then
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)b$H_  
       nb = bb(i) RgL>0s  
    End If MB $aN':  
Next i :>r W`= e'  
    rt(0) = Sqr(nb) RjTGm=1w  
    rr = rt() f8aY6o"i  
  End If mF|KjX~s  
         :=TIq  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  2M'dTXz  

*wj5(B<y  
有热压工艺方面的人才或者资料分享下；  e
]1Zey  
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 lV%1I@[M  

高手真多！

楼主威武霸气.