[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： vi[#?;pkF  
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图片:2.jpg

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关键点说几个： tyc8{t#Z  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 2x-'>i_|g  
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 QRsqPh&-  
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 g8%MOhg  

以下是几个重要的函数： ' oBo|  
1.判断点在区域中函数 wY' "ab  
2.计算夹角函数 [yO=S0 e  
3.转置函数 f&6w;T=  
4.得到区域中心点，及区域半径函数 CkRyzF  
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） Xy:Gj,@  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 9X!ET!  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single [.{^"<Z<  
   cax = x2 - x1 DLU[<!C  
   cay = y2 - y1 3voW  
   cbx = x2 - x3 g4Y) Bz
 
   cby = y2 - y3 ]
)eOa%  
   mo_jj = cax * cbx + cay * cby <'W=]IAV  
   mo_ca = Sqr(cax * cax + cay * cay) YdK_.t0Mu  
   mo_cb = Sqr(cbx * cbx + cby * cby) +-U@0&Y3M  
   cos_acb = mo_jj / (mo_ca * mo_cb) w-r_H!-  
   'ff_cos = cos_acb =D{B}=D\IM  
   If cos_acb >= 1 Then ]y.Rg{iv  
   nn = 0 nHnk#SAAu  
   ElseIf cos_acb <= -1 Then w nWgy4:  
   nn = 3.14159265258979 yDzdE;  
   Else ZOp^`c9~  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) Jms=YLIAA  
   End If ;{Xy`{Cg!  
   'ff_angle = nn `Uv)Sf{  
   ff_angle = nn * 180 / 3.14159265258979 Og=[4?Kpk  
End Function

'判断点在区域内函数 4\\.n  
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 ~> PgJ^G  
Dim aob, boc, cod, doa, sum As Single MO-!TZ+6  
  If ppx = p1x And ppy = p1y Then te)n{K",  
     point_in = True #9i6+.Z
 
     Exit Function 0potz]}  
  End If  +tIz[+u  
  If ppx = p2x And ppy = p2y Then 3|zgDA  
     point_in = True Qo.Uqz.C  
     Exit Function o*-9J2V=J  
  End If N};t<Xev  
   If ppx = p3x And ppy = p3y Then +>4^mE" \  
     point_in = True D;jK/2  
     Exit Function sXiv,  
  End If l0Y?v 4  
     f|#8qiUS  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) tfA}`
*$s  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) q4
k.f_{  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) J,(7.+`~#  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) }a^|L"  
    sum = aob + boc + cod + doa 5KJ%]B(H2  
    If 360.01 > sum And sum > 359.99 Then BRa{\R^I  
       point_in = True h8jB=e, H  
    Else ` 5#hjLe  
       point_in = False =e
{.yggE  
    End If iV!@bC,  
End Function

'得到点半径,得到交点坐标函数 
I+" lrU  
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() W Y:s gG  
    '求得中心点坐标 @1bH}QS  
Dim tt As String 8
_a3'o%5  
Dim rt(3) As Single JDA]t&D!v  
    '判断是否平行 2m"_
z  
   acx = p3x - p1x {cR=N~_EO  
   acy = p3y - p1y B |&F%P0:  
   bdx = p4x - p2x ,{8v4b-  
   bdy = p4y - p2y Kam]Mn'  
   If acx * bdy = acy * bdx Then mxp Y&Y  
      rt(0) = 0 '$[Di'*;  
      Exit Function jct./arK  
   Else H^ BYd%-  
      '判断斜率存在否 ){ gAj  
      If p1x = p3x And p2x <> p4x Then PsbG|~  
         tt = "ac_n_bd_y" vq>l>as9O  
      ElseIf p1x <> p3x And p2x = p4x Then .S7:;%qL6  
         tt = "ac_y_bd_n" 8+&JQ"UaB  
      ElseIf p1x <> p3x And p2x <> p4x Then opD-vDa h  
         tt = "ac_y_bd_y" 5)M2r!\  
      End If >1ZJ{se  
    Select Case tt  D:JS)+]  
         Case "ac_n_bd_y" J(s;$PG  
            'bd线段方程 e_rzA  
            k_bd = bdy / bdx bfdVED  
            b_bd = p2y - k_bd * p2x 7
&+Ys  
            p_x = p1x Jhy(x1%  
            p_y = k_bd * p_x + b_bd pbLGe'  
         Case "ac_y_bd_n" "U8S81'  
            'ac线段方程 ; )llt G  
            k_ac = acy / acx &{z<kmc$6  
            b_ac = p1y - k_ac * p1x  zF: j  
            p_x = p2x H;S%Y`V  
            p_y = k_ac * p_x + b_ac *7RvHHf  
        Case "ac_y_bd_y" l r~gG3  
           'ac，bd线段都要求 @;Y~frT  
           k_ac = acy / acx o`6|ba  
           b_ac = p1y - k_ac * p1x cj g.lzYH  
           k_bd = bdy / bdx Vz"u>BP3~  
           b_bd = p2y - k_bd * p2x /;oqf4MF  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) kg>>D  
           p_y = k_ac * p_x + b_ac .:9s}%Zr  
        End Select O3qM1-k}S  
      rt(1) = p_x 4l @)K9F  
      rt(2) = p_y |/T43ADW  
     fdv`7u+}a  
'计算最大半径 ROdK8*jL  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) A-uB\ L  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) n7l%gA*  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) aE/D*.0NI  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) =k{`oO~:9+  
Dim bb(5) As Single `.v(fC  
  bb(1) = rr1 AGq>=avv  
  bb(2) = rr2 G
oE 'L  
  bb(3) = rr3 ir[jCea,  
  bb(4) = rr4 RU&_j*U  
  nb = rr1 T):SGW  
For i = 1 To 4 `ifiL   
    If nb <= bb(i) Then |d}MxS`^  
       nb = bb(i) \40YGFO  
    End If #YK5WTn5  
Next i 0X9Y~TM%  
    rt(0) = Sqr(nb) UVEz;<5@\  
    rr = rt() ~cqryr9  
  End If M1!pQC_9  
         8;"*6vHZ  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  40P) 4
w  

6`H.%zM  
有热压工艺方面的人才或者资料分享下； 8<#U9]  
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 /2uQCw&x-  

高手真多！

楼主威武霸气.