[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： lqJ92vi6Q  
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关键点说几个： 6Z J-oT!.  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） .IdbaH _a  
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 Y)pop:y t  
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 ,h'Q  

以下是几个重要的函数： pInEB6L.P  
1.判断点在区域中函数 s=jYQ5nv  
2.计算夹角函数 hB.8\-}QMq  
3.转置函数 pY )x&uM!  
4.得到区域中心点，及区域半径函数 md'wre3  
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） ,iP YsW]5  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 IA.7If&k  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single ;iKtv+"  
   cax = x2 - x1 ^#Q-?O  
   cay = y2 - y1 ?VE'!DW  
   cbx = x2 - x3 A~a 3bCX+"  
   cby = y2 - y3 P* 0kz@  
   mo_jj = cax * cbx + cay * cby O]=jI  
   mo_ca = Sqr(cax * cax + cay * cay) CV"}(1T  
   mo_cb = Sqr(cbx * cbx + cby * cby) z!bT^_Cc0  
   cos_acb = mo_jj / (mo_ca * mo_cb) -sJD:G,%  
   'ff_cos = cos_acb +39uKOrZ  
   If cos_acb >= 1 Then B?8*-0a'[  
   nn = 0 IMqe(  
   ElseIf cos_acb <= -1 Then /}U)|6-B  
   nn = 3.14159265258979 k"DZ"JC  
   Else #9]2Uixq[  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) =&UE67eK,  
   End If &>+T*-'  
   'ff_angle = nn [=jZP,b&),  
   ff_angle = nn * 180 / 3.14159265258979 ~//9Nz~;3  
End Function

'判断点在区域内函数 @~ke=w6&pe  
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 GZrN,M  
Dim aob, boc, cod, doa, sum As Single q`2dL)E  
  If ppx = p1x And ppy = p1y Then X(BxC<!D.  
     point_in = True "M iJM+,  
     Exit Function w@,p`  
  End If \D z? h  
  If ppx = p2x And ppy = p2y Then aanS^t0  
     point_in = True QlMLWi  
     Exit Function us|Hb  
  End If sd%)g<t  
   If ppx = p3x And ppy = p3y Then COHBjufmR  
     point_in = True A8mc+ Bf(  
     Exit Function ]m 3cm  
  End If de W1>yh^_  
     u,8)M'UU  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) ;AOLbmb)H4  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) jnJ*e-AW  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) >fP;H}S6  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) +fboTsp% H  
    sum = aob + boc + cod + doa |-S!)iG1V  
    If 360.01 > sum And sum > 359.99 Then _w?!Mu  
       point_in = True )HE{`yiLL  
    Else qtAt=` s  
       point_in = False GBB
r[}y-  
    End If i,;eW&  
End Function

'得到点半径,得到交点坐标函数 7$%G3Q|)L  
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() IowXVdm@6  
    '求得中心点坐标 d*Mqs}8  
Dim tt As String 8~Zw"  
Dim rt(3) As Single o

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    '判断是否平行 *)w+xWmM3w  
   acx = p3x - p1x y(g]:#  
   acy = p3y - p1y ?'f  
   bdx = p4x - p2x R$l- 7YSt  
   bdy = p4y - p2y ZHZxr  
   If acx * bdy = acy * bdx Then Hm>cKPZ)  
      rt(0) = 0 )N- '~<N  
      Exit Function @R`6jS_gK  
   Else `!N}u  
      '判断斜率存在否 SN{A@dyt  
      If p1x = p3x And p2x <> p4x Then cOdRb=?9  
         tt = "ac_n_bd_y" baG_7>Q9H  
      ElseIf p1x <> p3x And p2x = p4x Then a"YVr'|  
         tt = "ac_y_bd_n" zOSUYn  
      ElseIf p1x <> p3x And p2x <> p4x Then ?q4`&";{3  
         tt = "ac_y_bd_y" I^f|U
 
      End If [N~7PNdS  
    Select Case tt Xux[  
         Case "ac_n_bd_y"
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            'bd线段方程 xV+\R/)x  
            k_bd = bdy / bdx Mx,5  
            b_bd = p2y - k_bd * p2x ?,riwDI 2  
            p_x = p1x Ww8U{f  
            p_y = k_bd * p_x + b_bd U1/I(w  
         Case "ac_y_bd_n" 6P>Y2xV:  
            'ac线段方程 W^^0Rh_  
            k_ac = acy / acx S[9b I&C  
            b_ac = p1y - k_ac * p1x v7@"9Uw}  
            p_x = p2x l]&A5tz3  
            p_y = k_ac * p_x + b_ac z6M5'$\y  
        Case "ac_y_bd_y" m[y~-n  
           'ac，bd线段都要求 rMJ@oc  
           k_ac = acy / acx gh[q*%#  
           b_ac = p1y - k_ac * p1x Jgr;'U$  
           k_bd = bdy / bdx }*9F`=%F  
           b_bd = p2y - k_bd * p2x jbe:"Stw  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) Wx3DWY;  
           p_y = k_ac * p_x + b_ac N)H+Ng[  
        End Select }OcrA/  
      rt(1) = p_x `UzH *w@e  
      rt(2) = p_y <!G /&T  
     mB0`>?#i  
'计算最大半径 rN#9p+t$  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 9=iMP~?xF  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) 7^rT-f07  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) & ;5f/  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) Oz\J+  
Dim bb(5) As Single Y'P^]Q=}_#  
  bb(1) = rr1 L=Aj+  
  bb(2) = rr2 ]g9SUFM  
  bb(3) = rr3 "&D0Sd@[?  
  bb(4) = rr4 @(=?x:j  
  nb = rr1 tq}sedYhee  
For i = 1 To 4 >clVV6B  
    If nb <= bb(i) Then W^[QEmyn  
       nb = bb(i) !X"nN9k  
    End If R=Lkf  
Next i ?$A)lWk(  
    rt(0) = Sqr(nb) M-Vz$D/aed  
    rr = rt() ;6 d-+(@  
  End If x%$6l  
         ^=-25%&^  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  QWAtF@qTV  

![aa@nOSa  
有热压工艺方面的人才或者资料分享下； -h,?_d>  
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 3|1v)E  

高手真多！

楼主威武霸气.