[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： H{vKk  
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图片:2.jpg

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关键点说几个： fx5S2%f^  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） heCM+=#~  
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 A~bSB n: '  
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 LJGpa)(  

以下是几个重要的函数： J[ Gpd  
1.判断点在区域中函数 4d@yAr}  
2.计算夹角函数 5wx_ol}2  
3.转置函数 @(sz"  
4.得到区域中心点，及区域半径函数 lPR=C0h}@  
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\XNOJH  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 dw"Es;^  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single oRWje#4O  
   cax = x2 - x1 k<<x}=  
   cay = y2 - y1 !cyrt<  
   cbx = x2 - x3 9Y:I)^ek  
   cby = y2 - y3 !/XNpQP  
   mo_jj = cax * cbx + cay * cby @
Lnv  
   mo_ca = Sqr(cax * cax + cay * cay) bw P=f.  
   mo_cb = Sqr(cbx * cbx + cby * cby) PlkZ)S7C  
   cos_acb = mo_jj / (mo_ca * mo_cb) p3=Py7iz  
   'ff_cos = cos_acb
'Cc~|gOgD  
   If cos_acb >= 1 Then 0~qc,-)3  
   nn = 0 |H?t+Dyn)q  
   ElseIf cos_acb <= -1 Then 7S a9  
   nn = 3.14159265258979 zEI+)|4?r  
   Else .Fo#Dmq3  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) kW/G=_6  
   End If 'Lrn<  
   'ff_angle = nn l)%PvLbL  
   ff_angle = nn * 180 / 3.14159265258979 <L-F3Buu  
End Function

'判断点在区域内函数 >yC=@Uq+  
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 Jl{ 0q7b  
Dim aob, boc, cod, doa, sum As Single 5#DMizv6  
  If ppx = p1x And ppy = p1y Then k*$WAOJEW  
     point_in = True Cyg2o<O@  
     Exit Function 2l<2srEK  
  End If TR DQ+Z  
  If ppx = p2x And ppy = p2y Then BHY8G06  
     point_in = True I1<WHq  
     Exit Function dQ`Tt- n  
  End If ;st0Ekni)  
   If ppx = p3x And ppy = p3y Then 7:jLZ!mgi  
     point_in = True {kpF etXt?  
     Exit Function d0(zB5'}  
  End If @2>UR9j  
     ~lj[> |\Oj  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) ?:"ABkL|+Y  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) ;U* /\+*h  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) sA2-3V<t8  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 2HeX( rB  
    sum = aob + boc + cod + doa o2!738  
    If 360.01 > sum And sum > 359.99 Then N"70P/  
       point_in = True !.vyzCJTzB  
    Else HRf;bKZ  
       point_in = False  mwAN9<o  
    End If bU=Utniq  
End Function

'得到点半径,得到交点坐标函数 0m_yW$w  
Function rr(p1x As Single, p1y As Single, p2x As Single, p2y As Single, p3x As Single, p3y As Single, p4x As Single, p4y As Single) As Single() w!f2~j~  
    '求得中心点坐标 AQ,lLn+  
Dim tt As String {-Y;!  
Dim rt(3) As Single cH5i420;aO  
    '判断是否平行 I6.rN\%b  
   acx = p3x - p1x N>I6f  
   acy = p3y - p1y QH'*MY  
   bdx = p4x - p2x <`nShP>vl  
   bdy = p4y - p2y &L8RLSfX  
   If acx * bdy = acy * bdx Then xw#CwMbbi  
      rt(0) = 0 v) n-  
      Exit Function i'ap8Dr  
   Else /!5Wd(:  
      '判断斜率存在否 6 U.Jaai:  
      If p1x = p3x And p2x <> p4x Then h^3gYL7O6  
         tt = "ac_n_bd_y" 5u$.!l8Nl  
      ElseIf p1x <> p3x And p2x = p4x Then n>
'(d*[e&  
         tt = "ac_y_bd_n"
7]VR)VAM  
      ElseIf p1x <> p3x And p2x <> p4x Then @A,8>0+  
         tt = "ac_y_bd_y" :kgh~mx5LF  
      End If iH(7.?.r  
    Select Case tt {++EX2  
         Case "ac_n_bd_y"
OUBGbld  
            'bd线段方程 &=@{`2&  
            k_bd = bdy / bdx io#}z4"'qY  
            b_bd = p2y - k_bd * p2x Ln>!4i+-B)  
            p_x = p1x D$ds[if$U,  
            p_y = k_bd * p_x + b_bd C$w%! jE  
         Case "ac_y_bd_n" *6}M.`.-  
            'ac线段方程 MLDzWZ~}ef  
            k_ac = acy / acx `O\>vn  
            b_ac = p1y - k_ac * p1x jq~`rE h9  
            p_x = p2x @|Pm%K`1  
            p_y = k_ac * p_x + b_ac 3%POTAw%  
        Case "ac_y_bd_y" p(F@lL-  
           'ac，bd线段都要求 j,YrM?Xdo  
           k_ac = acy / acx Wdd}y`lS  
           b_ac = p1y - k_ac * p1x f{9+,z   
           k_bd = bdy / bdx ^to*ET{0  
           b_bd = p2y - k_bd * p2x o
5Oig  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) Rpn<"LIoB:  
           p_y = k_ac * p_x + b_ac x1gS^9MqCB  
        End Select J9T2 p\5  
      rt(1) = p_x $?GggP d  
      rt(2) = p_y tc~gn!"  
     SAm%$vz%M  
'计算最大半径 Y'/6T]a  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) c9/w{
}F  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) E1QJ^]MG.  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) mb*Yw6q  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) s
<k[<  
Dim bb(5) As Single R_EU|a
  
  bb(1) = rr1 H!;N0",]N  
  bb(2) = rr2 8qe[x\,"8  
  bb(3) = rr3 lelmX  
  bb(4) = rr4 kQ+y9@=/g  
  nb = rr1 dk&F?B{6T  
For i = 1 To 4 .tRm1&Qi  
    If nb <= bb(i) Then m H:Un{,  
       nb = bb(i) -zK>{)Z=q  
    End If _T)y5/[  
Next i `EKf1U\FI  
    rt(0) = Sqr(nb) e:G~P u`  
    rr = rt() uda++^y:  
  End If pm O9mWq   
         k^7!iOK2  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  '$,yV f  

tHzgZoBz  
有热压工艺方面的人才或者资料分享下； v,n 8$,  
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 [ as,AX  

高手真多！

楼主威武霸气.