[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： dtJ?J<m}  
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关键点说几个： ibha`  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 8
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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"GOc,  
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 ^i:%0"[*^i  

以下是几个重要的函数： dD ?ZF6  
1.判断点在区域中函数 J#ujIe  
2.计算夹角函数 U4M}E h8  
3.转置函数 HHzAmHt  
4.得到区域中心点，及区域半径函数 `)?N7g[\u  
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） it77x3Mm F  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 x,L<{A`z  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single 4 ))ZBq?  
   cax = x2 - x1 9lqH  
   cay = y2 - y1 x18(}4  
   cbx = x2 - x3 \:y oS>G  
   cby = y2 - y3 %>Q[j`9y  
   mo_jj = cax * cbx + cay * cby Opavno%&  
   mo_ca = Sqr(cax * cax + cay * cay) < #FxI  
   mo_cb = Sqr(cbx * cbx + cby * cby) N(s5YX7<hd  
   cos_acb = mo_jj / (mo_ca * mo_cb) Q-<h)WTA  
   'ff_cos = cos_acb lV".-:u_  
   If cos_acb >= 1 Then tzJ7wXRr  
   nn = 0 'Y2ImSWj  
   ElseIf cos_acb <= -1 Then z>]P_E~`}  
   nn = 3.14159265258979 n,D&pl9f  
   Else 3LRBH+Tt  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) :_k5[KT.]9  
   End If L0.F}~S  
   'ff_angle = nn qf T71o(  
   ff_angle = nn * 180 / 3.14159265258979 FRhHp(0}5  
End Function

'判断点在区域内函数 #(7^V y&  
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 T].Xx`  
Dim aob, boc, cod, doa, sum As Single dk/f_m  
  If ppx = p1x And ppy = p1y Then >=1Aa,_tc  
     point_in = True m`BE{%  
     Exit Function uA4xxY  
  End If qr4.s$VGs*  
  If ppx = p2x And ppy = p2y Then (
T!#7  
     point_in = True !LM9  
     Exit Function p(>D5uN_}5  
  End If w?V;ItcL  
   If ppx = p3x And ppy = p3y Then TXT!Ae  
     point_in = True I= 2jQ>$Q  
     Exit Function .;F%k,!v  
  End If ZZM;%i-B  
     IY hwFw 5O  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) _1G;!eO  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) tH=jaFJ   
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) \NZ@>on  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) a$K6b5`>Rs  
    sum = aob + boc + cod + doa MzMVs3w|  
    If 360.01 > sum And sum > 359.99 Then +,]_TxL|C  
       point_in = True 8.HJoos  
    Else k%R(Qga  
       point_in = False ?f= ~Pn+  
    End If _MWW  
End Function

'得到点半径,得到交点坐标函数 YpgO]\/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() *B)10R  
    '求得中心点坐标 8
=)9ZjfD  
Dim tt As String >}B53.;.k  
Dim rt(3) As Single jx'hxC'3  
    '判断是否平行 ^HU>fkSk  
   acx = p3x - p1x FqZD'Uu7  
   acy = p3y - p1y >>c%Ic  
   bdx = p4x - p2x Pv|sPIIB7  
   bdy = p4y - p2y Yyw9IYB;  
   If acx * bdy = acy * bdx Then 1:RK~_E  
      rt(0) = 0 b/_u\R ]-'  
      Exit Function \*M;W|8aB  
   Else ]E.\ |I(  
      '判断斜率存在否 .l,]yWwfK  
      If p1x = p3x And p2x <> p4x Then XqGa]/;}  
         tt = "ac_n_bd_y" *^KEb")$  
      ElseIf p1x <> p3x And p2x = p4x Then "pO**z$Z  
         tt = "ac_y_bd_n" }zIWagC6  
      ElseIf p1x <> p3x And p2x <> p4x Then LVy`U07CV  
         tt = "ac_y_bd_y" .e4upTGU  
      End If ;Fd1:"1pP  
    Select Case tt %XQJ!sC`  
         Case "ac_n_bd_y" "EVf1iQ  
            'bd线段方程 !C(PfsrR/  
            k_bd = bdy / bdx %jJIR88  
            b_bd = p2y - k_bd * p2x _C=01 %/  
            p_x = p1x Nxt`5kSx=  
            p_y = k_bd * p_x + b_bd fymmAfaR  
         Case "ac_y_bd_n" ps^["3e  
            'ac线段方程 x_9#:_S'  
            k_ac = acy / acx ]f5vk  
            b_ac = p1y - k_ac * p1x ,&g-DCag  
            p_x = p2x 9I}Uh#]k<  
            p_y = k_ac * p_x + b_ac {L \TO,  
        Case "ac_y_bd_y" ol~ tfS  
           'ac，bd线段都要求 ,kUg"\_k  
           k_ac = acy / acx
 hOYX  
           b_ac = p1y - k_ac * p1x 0d$LUQ't  
           k_bd = bdy / bdx #=72/[  
           b_bd = p2y - k_bd * p2x 3v&Shb?xb;  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) xVrLoAw  
           p_y = k_ac * p_x + b_ac Esm=sPW  
        End Select );?tGX  
      rt(1) = p_x ^)o]hE|  
      rt(2) = p_y 7%&e4'SZO  
     [+ : zlA  
'计算最大半径 ;Aheeq746  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y)
qW /&.  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) w4R~0jXy  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) b>9?gmR{  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) UGvUU<N|N  
Dim bb(5) As Single =>JA; ft  
  bb(1) = rr1 p}JGx^X~  
  bb(2) = rr2 [x- 9m\h  
  bb(3) = rr3 k8i0`VY5Y  
  bb(4) = rr4 [;l;kom  
  nb = rr1 rCb$^(w{7  
For i = 1 To 4 JxKd  
    If nb <= bb(i) Then ~fs} J  
       nb = bb(i) PP/#Z~.M  
    End If qxcTY|&  
Next i 9?^0pR p  
    rt(0) = Sqr(nb) |,({$TrF  
    rr = rt() 1/syzHjbY  
  End If (4IP&^j:\  
         fF2]7:  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  [Kb)Q{=)  

d6zq,x!
cI  
有热压工艺方面的人才或者资料分享下； gQeoCBCE  
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 C?<[oQb#  

高手真多！

楼主威武霸气.