[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： PJwEA  
=tq7z =k  
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关键点说几个： {"}+V`O{  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） CH#kvR2  
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 / (.'*biQ  
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 gm}C\q9  

以下是几个重要的函数： e$x4Ux7*"  
1.判断点在区域中函数 |#!eMJ&0  
2.计算夹角函数 \(wn@/yP'  
3.转置函数 C!`>cUhE{  
4.得到区域中心点，及区域半径函数 EGr|BLl  
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） v5P*<U Ax  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 Ks9FnDm8  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single wE-Ji<1HJ  
   cax = x2 - x1 ?r^ hmu"a  
   cay = y2 - y1 u4`mQ6  
   cbx = x2 - x3 \Ac}R'  
   cby = y2 - y3 e4[-rkn{hl  
   mo_jj = cax * cbx + cay * cby )er?*^9Z  
   mo_ca = Sqr(cax * cax + cay * cay) Q$/V)0  
   mo_cb = Sqr(cbx * cbx + cby * cby) s
ZlJ/_g  
   cos_acb = mo_jj / (mo_ca * mo_cb) }wa}hIqx  
   'ff_cos = cos_acb tjBh$)  
   If cos_acb >= 1 Then !C9ps]6
 
   nn = 0 ^.ZSpc}<  
   ElseIf cos_acb <= -1 Then :w?:WH?2L  
   nn = 3.14159265258979 !D.= 'V  
   Else $.suu^>^w  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) lGD%R'}  
   End If e;&{50VY  
   'ff_angle = nn 3I(dC|d  
   ff_angle = nn * 180 / 3.14159265258979 -6hu31W  
End Function

'判断点在区域内函数 s/W!6JX4  
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 *783xEF>f  
Dim aob, boc, cod, doa, sum As Single +[X.-,yW  
  If ppx = p1x And ppy = p1y Then Y1yvI  
     point_in = True .dg 4gr\D  
     Exit Function yP<:iCY  
  End If (d5vH)+A  
  If ppx = p2x And ppy = p2y Then )$lSG}WD  
     point_in = True ~q'w),bE"Q  
     Exit Function ]sm0E@1  
  End If @> +^<  
   If ppx = p3x And ppy = p3y Then X,iuz/Q  
     point_in = True ^t^<KL;  
     Exit Function :) Fp B"  
  End If b Q9"GO<X  
     6/V{>MTZg  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) $&n240(  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) =A6u=  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) _>_y@-b  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) KOAz-h@6   
    sum = aob + boc + cod + doa S7#^u`'Q_^  
    If 360.01 > sum And sum > 359.99 Then J7
*G/F  
       point_in = True x#}j3" PP  
    Else go%X%Os]  
       point_in = False <'4!G"_EP  
    End If u%gm+NneK  
End Function

'得到点半径,得到交点坐标函数 b09#+CH?  
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() loqS?bC]  
    '求得中心点坐标 \<MTY:  
Dim tt As String ;KjMZ(Iil1  
Dim rt(3) As Single /wCxf5q0  
    '判断是否平行 :EldP,s#x%  
   acx = p3x - p1x ;xkf?|  
   acy = p3y - p1y fY+ .#V  
   bdx = p4x - p2x 0\y
tBxL  
   bdy = p4y - p2y 0,D9\ Ebd  
   If acx * bdy = acy * bdx Then 1 FIiX  
      rt(0) = 0 xzf)_ <  
      Exit Function |sZ9/G7  
   Else c,s<q j  
      '判断斜率存在否 GPhwq n{  
      If p1x = p3x And p2x <> p4x Then \?mU$,voI  
         tt = "ac_n_bd_y" r'JK$9  
      ElseIf p1x <> p3x And p2x = p4x Then XuAc3~HAd  
         tt = "ac_y_bd_n" [?r\b  
      ElseIf p1x <> p3x And p2x <> p4x Then eEds-&_  
         tt = "ac_y_bd_y" apWrcaj  
      End If j~j V`>A  
    Select Case tt By"ul:.D  
         Case "ac_n_bd_y" HvfTC<+H  
            'bd线段方程 [~r$US  
            k_bd = bdy / bdx 6nk|*HPz  
            b_bd = p2y - k_bd * p2x i~PZvxt  
            p_x = p1x BOcEL%+  
            p_y = k_bd * p_x + b_bd vH:+  
         Case "ac_y_bd_n" cngPc]?N  
            'ac线段方程 Fl(ZKpSZU  
            k_ac = acy / acx hdDI%3vk3  
            b_ac = p1y - k_ac * p1x ]$k m  
            p_x = p2x nLLHggNAV  
            p_y = k_ac * p_x + b_ac ?=o]Wx0(9  
        Case "ac_y_bd_y" f2K3*}P  
           'ac，bd线段都要求 "Q!{8 9Y  
           k_ac = acy / acx K?<Odw'k  
           b_ac = p1y - k_ac * p1x ^\t">NJ^  
           k_bd = bdy / bdx 97 X60<  
           b_bd = p2y - k_bd * p2x O*"wQ50Ou  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) 7`n8 OR4  
           p_y = k_ac * p_x + b_ac Z s!q#qM  
        End Select H0Xda.Y(  
      rt(1) = p_x g}`CdVQ2M<  
      rt(2) = p_y xg!\C@$  
     Wl"fh_  
'计算最大半径 6h"?3w  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) Z.f<6<gF  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) ({62GWnn_  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) _C\ d^a(  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) c=mFYsSv  
Dim bb(5) As Single BU .G~0  
  bb(1) = rr1 1Ee>pbd  
  bb(2) = rr2 l1j   
  bb(3) = rr3 J8[Xl.  
  bb(4) = rr4 #rC+13  
  nb = rr1 :~(^b;yhZ  
For i = 1 To 4 3Q6
#m3AWY  
    If nb <= bb(i) Then pfIvBU?  
       nb = bb(i) 0;`PHNBq  
    End If +1A<kJ  
Next i z(a:fL{/XG  
    rt(0) = Sqr(nb) $a]dxRkz  
    rr = rt() r F-yD1  
  End If ~~ w4854  
         nP /$uj  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  wSGUNP9  

1x]G/I*  
有热压工艺方面的人才或者资料分享下； 6aL
`^^  
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 !#QD;,SE+  

高手真多！

楼主威武霸气.