[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： ~~,rp) )  
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关键点说几个： Wt9Q;hK  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 7 +@qB]Bi<  
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 *8tI*Pus  
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 ([VV%ovZ  

以下是几个重要的函数： gxGrspqg  
1.判断点在区域中函数 CCGV~e+  
2.计算夹角函数 F("#^$  
3.转置函数 _ZAchzV  
4.得到区域中心点，及区域半径函数 rqlc2m,<-p  
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） @i3bgx>_o  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 *}):<nB$^  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single [&qA\  
   cax = x2 - x1 +/+P\O  
   cay = y2 - y1 ^5t  
   cbx = x2 - x3 {hO`6mr&t  
   cby = y2 - y3 VIR.yh  
   mo_jj = cax * cbx + cay * cby e|r0zw S  
   mo_ca = Sqr(cax * cax + cay * cay) (,xZGa  
   mo_cb = Sqr(cbx * cbx + cby * cby) jRpdft  
   cos_acb = mo_jj / (mo_ca * mo_cb) cxYfZ4++m  
   'ff_cos = cos_acb L{ymI)Y^  
   If cos_acb >= 1 Then mEuHl>  
   nn = 0 Yp4c'Zk  
   ElseIf cos_acb <= -1 Then })IO#,  
   nn = 3.14159265258979 7> Pgc
 
   Else RX2{g^V7  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) /MOnNnV  
   End If %E27.$E_  
   'ff_angle = nn Ld|V^9h1;  
   ff_angle = nn * 180 / 3.14159265258979 ~tGCLf]c\  
End Function

'判断点在区域内函数 |[cdri^?D  
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 <2P7utdZ   
Dim aob, boc, cod, doa, sum As Single |&hU=J o  
  If ppx = p1x And ppy = p1y Then 1=Ilej1  
     point_in = True 3,.% s  
     Exit Function ]i8c\UV\  
  End If I*1S/o_xI  
  If ppx = p2x And ppy = p2y Then ".2A9]
_s  
     point_in = True LI:T
c7t  
     Exit Function 
&(&  
  End If ;
>2#@QP  
   If ppx = p3x And ppy = p3y Then En9R>A;`  
     point_in = True amB@N6*  
     Exit Function }BN\/;<A  
  End If "'eWn6O(  
     @PcCiGZ  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) Qp!Y.YnPd_  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) sS,#0Qt.  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) GzdgL"M[  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) {:Vf0Mhb  
    sum = aob + boc + cod + doa $+:(f{Va*  
    If 360.01 > sum And sum > 359.99 Then D&[Z;,CHMA  
       point_in = True 4S *,\q]q  
    Else ^&:'NR  
       point_in = False }#b %"I0  
    End If %N~;{!![p  
End Function

'得到点半径,得到交点坐标函数 9oq)X[  
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() BQ#jwu0e  
    '求得中心点坐标 g
lor+  
Dim tt As String DM2Q1Dh3  
Dim rt(3) As Single [~?M
/QI9  
    '判断是否平行
"3t\em!  
   acx = p3x - p1x Gj`f--2GE  
   acy = p3y - p1y h3h8lt_|  
   bdx = p4x - p2x 3zb)"\(R  
   bdy = p4y - p2y MxN]7  
   If acx * bdy = acy * bdx Then d8.ajeN]o  
      rt(0) = 0 p}8ratmN  
      Exit Function ]hUKuef  
   Else x<Se>+  
      '判断斜率存在否 )_O.{$ to  
      If p1x = p3x And p2x <> p4x Then
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         tt = "ac_n_bd_y" 0Uaem  
      ElseIf p1x <> p3x And p2x = p4x Then 6 ">oo-
 
         tt = "ac_y_bd_n" +UaO<L  
      ElseIf p1x <> p3x And p2x <> p4x Then &enlAV'#)O  
         tt = "ac_y_bd_y" U]j&cFbn5_  
      End If 8OBF^r44R  
    Select Case tt 
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         Case "ac_n_bd_y" Ty}R^cy{d  
            'bd线段方程 u-M] Az-  
            k_bd = bdy / bdx sWW\bK0B4  
            b_bd = p2y - k_bd * p2x auA.6DQ  
            p_x = p1x DJJZJ}7  
            p_y = k_bd * p_x + b_bd XbXgU#%  
         Case "ac_y_bd_n" n8?KSQy$  
            'ac线段方程 >%i9oI<)  
            k_ac = acy / acx ZE ^u.>5  
            b_ac = p1y - k_ac * p1x />!!ch  
            p_x = p2x n%U9iwJ.  
            p_y = k_ac * p_x + b_ac !pV<n  
        Case "ac_y_bd_y" iDR6?fP  
           'ac，bd线段都要求 RhyegD  
           k_ac = acy / acx |3|wdzV  
           b_ac = p1y - k_ac * p1x \y,;Cfl<  
           k_bd = bdy / bdx bN4d:0Y  
           b_bd = p2y - k_bd * p2x mN7&%Z  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) m^c%]5$  
           p_y = k_ac * p_x + b_ac }*ODM6  
        End Select &{hc   
      rt(1) = p_x Bx%=EN5.  
      rt(2) = p_y Cd9t{pQD4  
     _AAx )  
'计算最大半径 Q+/R JM?3@  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 5GUH;o1m  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) PgqECd)f  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) Q{`@ G"'  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y)  TVj1C  
Dim bb(5) As Single hX %s]"  
  bb(1) = rr1 78^Y;2 P]W  
  bb(2) = rr2 3lyQn"  
  bb(3) = rr3 )e#fj+>x)  
  bb(4) = rr4 Fv;u1Atiw  
  nb = rr1 _4~k3%w\`l  
For i = 1 To 4 I_K[!4~Kn  
    If nb <= bb(i) Then 9c:5t'Qt5.  
       nb = bb(i) 2;O  c^  
    End If `2sdZ/fO  
Next i .M}06,-  
    rt(0) = Sqr(nb) `$f\ 
%  
    rr = rt() enWF7`  
  End If kaV%0Of]  
         .!!79 6hS  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  PX+"" #  

NZC<m$')  
有热压工艺方面的人才或者资料分享下； w*]_FqE  
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 roK4RYJ7)  

高手真多！

楼主威武霸气.