[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： Mc8|4/<Z  
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关键点说几个： sb1Zm*m6  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） Lj]I7ICNh  
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 +SM&_b  
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 Z|78>0SAt  

以下是几个重要的函数： S7|6dwQ&  
1.判断点在区域中函数 tx$i(  
2.计算夹角函数 l7{]jKJue  
3.转置函数 w@K4u{|  
4.得到区域中心点，及区域半径函数 w)Rtt 9  
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） ,s=jtK  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 t^8ii  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single "-y2En  
   cax = x2 - x1 73n|G/9n[  
   cay = y2 - y1 "PFczoRZ  
   cbx = x2 - x3 dwH8Zg$B  
   cby = y2 - y3 ;8|D4+  
   mo_jj = cax * cbx + cay * cby k!&G;6O-  
   mo_ca = Sqr(cax * cax + cay * cay) I "8:IF  
   mo_cb = Sqr(cbx * cbx + cby * cby) fX:)mLnO/  
   cos_acb = mo_jj / (mo_ca * mo_cb) RFsd/K;Zp  
   'ff_cos = cos_acb n;Nr[hI  
   If cos_acb >= 1 Then 4t C-msTf  
   nn = 0 $ 8"we  
   ElseIf cos_acb <= -1 Then t)#dR._q  
   nn = 3.14159265258979 i8h(b2odQ  
   Else c `[,>  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 7o+JQ&fF;  
   End If @ij8AGE:  
   'ff_angle = nn yN'<iTh  
   ff_angle = nn * 180 / 3.14159265258979 fbl8:c)I  
End Function

'判断点在区域内函数 /Zzb7bHLK  
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 nnzfKn:J  
Dim aob, boc, cod, doa, sum As Single z: ;ZPSn  
  If ppx = p1x And ppy = p1y Then YK=o[nPmK  
     point_in = True Mk3~%`  
     Exit Function sI/]pgt2  
  End If _v[yY3=3  
  If ppx = p2x And ppy = p2y Then fGwRv%$^  
     point_in = True /
LH# 3  
     Exit Function /k$H"'`j4  
  End If a>05Yxw  
   If ppx = p3x And ppy = p3y Then =do*(  
     point_in = True :jKiHeBQu?  
     Exit Function 7Gos-_s  
  End If E43Gk!/|(  
     5qe6/E@  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) A"Prgf eT  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) u|.c?fW'3  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) o+wG69  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) X\=m  
    sum = aob + boc + cod + doa \68x]q[  
    If 360.01 > sum And sum > 359.99 Then qe/|u3I<lF  
       point_in = True MV(Sb:RZ  
    Else FX->_}kL=  
       point_in = False Ej[
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    End If  9Kpzj43  
End Function

'得到点半径,得到交点坐标函数 ].!^BYNht  
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() yF _@^V  
    '求得中心点坐标 fr19C%{  
Dim tt As String sOf;I]E|  
Dim rt(3) As Single h1A/:/_M6  
    '判断是否平行 qH8d3?1XO  
   acx = p3x - p1x Ir,3' G  
   acy = p3y - p1y Jc3Z1Tt  
   bdx = p4x - p2x 4
PcsU HR  
   bdy = p4y - p2y {9,!XiF.:  
   If acx * bdy = acy * bdx Then liuw!
  
      rt(0) = 0 )' hOW
*v  
      Exit Function <'N(`.&3C  
   Else J% b`*?A  
      '判断斜率存在否 T, z80m}  
      If p1x = p3x And p2x <> p4x Then S>6f0\F/Y%  
         tt = "ac_n_bd_y" 82>90e(CH]  
      ElseIf p1x <> p3x And p2x = p4x Then rgK:ujzW!  
         tt = "ac_y_bd_n" wuV*!oefo  
      ElseIf p1x <> p3x And p2x <> p4x Then Ofm?`SE*|  
         tt = "ac_y_bd_y" SKUri  
      End If
fDzG5}i  
    Select Case tt Uc[@]  
         Case "ac_n_bd_y" 1FPt%{s3  
            'bd线段方程 c@&`!e  
            k_bd = bdy / bdx f~rq)2V:  
            b_bd = p2y - k_bd * p2x Jfe<$-$$7  
            p_x = p1x c97?+Y^  
            p_y = k_bd * p_x + b_bd CD"D^\z  
         Case "ac_y_bd_n" U?[_ d  
            'ac线段方程 rZi\  
            k_ac = acy / acx )*CDufRFz  
            b_ac = p1y - k_ac * p1x Rt6(y #dF  
            p_x = p2x 6!;eJYj,  
            p_y = k_ac * p_x + b_ac N}/|B}  
        Case "ac_y_bd_y" d'okX
CG  
           'ac，bd线段都要求 JHvawFBN<u  
           k_ac = acy / acx :ot^bAyt|  
           b_ac = p1y - k_ac * p1x K!cLEG!G  
           k_bd = bdy / bdx uexm|5|  
           b_bd = p2y - k_bd * p2x ]}za
 
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) m8:9Uv  
           p_y = k_ac * p_x + b_ac kgZiyPcw  
        End Select zF([{5r[!)  
      rt(1) = p_x iLIv<VK/d  
      rt(2) = p_y 2|re4  
     V:Lq>rs#  
'计算最大半径 ~rl,Hr3Zo  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) -V_iv/fmM  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) |ler\"Eu  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) ~TvKMW6/#  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) v"I#.{LiH=  
Dim bb(5) As Single {pR4+g  
  bb(1) = rr1 7+Z%#G~T  
  bb(2) = rr2 <5t2+D]]}  
  bb(3) = rr3 -
H+<81"B#  
  bb(4) = rr4 5Kw$QJ/  
  nb = rr1 NE1n9  
For i = 1 To 4 q[ -YXO  
    If nb <= bb(i) Then oj'a%mx  
       nb = bb(i) <} BuU!  
    End If KccIYn~  
Next i 7/>#yR  
    rt(0) = Sqr(nb) :5DL&,,Q3  
    rr = rt() = 9K5f#;e  
  End If 7J6D wh{  
         oz[
Mt i*  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  CBKLct>  

<.knM  
有热压工艺方面的人才或者资料分享下； Y2d(HD@  
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 5i1E 5@
~  

高手真多！

楼主威武霸气.