[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： PC*m% ?+  
?n!lUr$:y  
]]>nbgGn#  

关键点说几个： - $%jb2  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） kEO1TS  
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 zVdKYs i^  
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 g;8M<`qvf  

以下是几个重要的函数： V"O9n[|  
1.判断点在区域中函数 yr5NRs  
2.计算夹角函数 cv= \g Z  
3.转置函数 ?9p$XG  
4.得到区域中心点，及区域半径函数 Mq@}snp"S  
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） _ \l HI  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 zrrz<dW  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single 7%4.b7Q  
   cax = x2 - x1 `y2ljIWJ  
   cay = y2 - y1 eES'}[W>  
   cbx = x2 - x3 wlrIgn%  
   cby = y2 - y3 RJx{e
ck%  
   mo_jj = cax * cbx + cay * cby G,
]z(%  
   mo_ca = Sqr(cax * cax + cay * cay) Wab.|\c  
   mo_cb = Sqr(cbx * cbx + cby * cby) t@)my[!  
   cos_acb = mo_jj / (mo_ca * mo_cb) .a,(pq Jg  
   'ff_cos = cos_acb 9<l-NU9 _  
   If cos_acb >= 1 Then =UNT.]  
   nn = 0 @bT3'K-4  
   ElseIf cos_acb <= -1 Then  iS  
   nn = 3.14159265258979 KaW~ERx5  
   Else T`?n,'!(  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) .fEwk  
   End If 'irGvex  
   'ff_angle = nn 4[1k\  
   ff_angle = nn * 180 / 3.14159265258979 >$uUuiyL4  
End Function

'判断点在区域内函数 uoCGSXsi  
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 >rw"Rd'  
Dim aob, boc, cod, doa, sum As Single T
V=c,*TV  
  If ppx = p1x And ppy = p1y Then rz.IoQo  
     point_in = True u s`}  
     Exit Function \f"1}f  
  End If -NzTqLBn
 
  If ppx = p2x And ppy = p2y Then fK_~lGY(  
     point_in = True RdI};K  
     Exit Function _CE9B e\  
  End If lR@& Z6lw  
   If ppx = p3x And ppy = p3y Then h$Tr sO  
     point_in = True 2.f|2:I  
     Exit Function ,QvYTJ{  
  End If Q]#Z9H  
     OQFi.8  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) H&bh<KPMh  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) J`<f  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) a#y{pT2 b  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) g$w6kz_[  
    sum = aob + boc + cod + doa X NE+(Bt  
    If 360.01 > sum And sum > 359.99 Then 8l23%iWxe  
       point_in = True QNArZ6UQ  
    Else 1lcnRHO  
       point_in = False kA^A mfba  
    End If *1bzg/T<  
End Function

'得到点半径,得到交点坐标函数 Rla4L`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() C9jbv/c  
    '求得中心点坐标 >a=d;  
Dim tt As String \r;F2C0*i  
Dim rt(3) As Single ?9e]   
    '判断是否平行 T//S,  
   acx = p3x - p1x LgHJo-+>  
   acy = p3y - p1y TyOH`5D  
   bdx = p4x - p2x 2Va4i7"X\  
   bdy = p4y - p2y g.a| c\WH  
   If acx * bdy = acy * bdx Then 4#:\?HAu!  
      rt(0) = 0 D{C:d\ e)$  
      Exit Function JJ5C}`(  
   Else (q~0XE/ a  
      '判断斜率存在否 lIh[|]  
      If p1x = p3x And p2x <> p4x Then wL2XNdo}<  
         tt = "ac_n_bd_y" 0=;YnsY  
      ElseIf p1x <> p3x And p2x = p4x Then kG^dqqn6  
         tt = "ac_y_bd_n" xvDI 4x&  
      ElseIf p1x <> p3x And p2x <> p4x Then &&PgOFD  
         tt = "ac_y_bd_y" #C\4/g?=,  
      End If :3?|VE F  
    Select Case tt p4wr`"Zz  
         Case "ac_n_bd_y" /2@["*^$  
            'bd线段方程 ]MAT2$"le  
            k_bd = bdy / bdx C4NRDwU|.  
            b_bd = p2y - k_bd * p2x CgnXr/!L  
            p_x = p1x Ror2qDF  
            p_y = k_bd * p_x + b_bd ]US[5)EL-  
         Case "ac_y_bd_n" 1V%'.l9  
            'ac线段方程 A1A3~9HuK  
            k_ac = acy / acx H06Bj(Y!  
            b_ac = p1y - k_ac * p1x CLN+I'uX0  
            p_x = p2x Nn#u%xvJt  
            p_y = k_ac * p_x + b_ac 6vp0*ww  
        Case "ac_y_bd_y" Vk7=7%xW  
           'ac，bd线段都要求 Uix{"  
           k_ac = acy / acx PayV,8   
           b_ac = p1y - k_ac * p1x 6fwY$K\X  
           k_bd = bdy / bdx 9;KJr[FQV  
           b_bd = p2y - k_bd * p2x EXpSh}  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) dWR1cvB(wY  
           p_y = k_ac * p_x + b_ac f=I:DkR  
        End Select Pp_V5,i\  
      rt(1) = p_x ]}LGbv"`A  
      rt(2) = p_y Ze ? g  
     ~FUa:KYD  
'计算最大半径 {4rQ7J4Ux  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) CV^c",b_  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) aqr!oxn?t  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) zk=\lp2  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 3s(Ia^  
Dim bb(5) As Single }*kJ-q&0  
  bb(1) = rr1 X~RH^VYv  
  bb(2) = rr2 ]k+m=OR{/  
  bb(3) = rr3 T9)wj][ .  
  bb(4) = rr4 RP` `mI  
  nb = rr1 +LzovC@^  
For i = 1 To 4 (@&I_>2Q  
    If nb <= bb(i) Then JBcY!dy-d  
       nb = bb(i) -G b-^G  
    End If -(;LQDG |  
Next i )U(u>SV(\  
    rt(0) = Sqr(nb) 7+XM3  
    rr = rt() Dip*}8$o(w  
  End If `WlE| G[  
         4}yE+dRUK:  
End Function

高手啊.人才啊.

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

,!>fmU`E4  
有热压工艺方面的人才或者资料分享下； !6E:5=L^  
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 @^CG[:|  

高手真多！

楼主威武霸气.