[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： @D
o=
k  
S|+o-[e8O  

描述:请输入描述

图片:2.jpg

l1Fc>:o{  

关键点说几个： N87B8rDl  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） C;urBsC  
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 *;*r8[U}q  
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 \)|hogI|f  

以下是几个重要的函数： ixD)VcD-f  
1.判断点在区域中函数 n6a`;0f[R  
2.计算夹角函数 W6/yn
 
3.转置函数 B`J~^+`[*  
4.得到区域中心点，及区域半径函数 ?(i{y~  
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） LSr]S79N1  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 NHZz _a=  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single JnM["Q=`  
   cax = x2 - x1 V33T+P~j  
   cay = y2 - y1 j#q-^
h3H  
   cbx = x2 - x3 0Z{ZO*rK  
   cby = y2 - y3 E09:E  
   mo_jj = cax * cbx + cay * cby fmDCPkj  
   mo_ca = Sqr(cax * cax + cay * cay) }S<2A7)el  
   mo_cb = Sqr(cbx * cbx + cby * cby) 7E~;xn;  
   cos_acb = mo_jj / (mo_ca * mo_cb) N5b!.B x-w  
   'ff_cos = cos_acb HCC#j9UN6  
   If cos_acb >= 1 Then VS8Rx.?  
   nn = 0 Fy-t T]Q9  
   ElseIf cos_acb <= -1 Then ckE-",G  
   nn = 3.14159265258979 u5f9Jw}  
   Else b!5~7Ub.No  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) xYpd: Sm  
   End If J{fH['tzO  
   'ff_angle = nn 9m~p0ILh  
   ff_angle = nn * 180 / 3.14159265258979 o]I\6,T/|  
End Function

'判断点在区域内函数 |imM#wF  
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 #fn)k1  
Dim aob, boc, cod, doa, sum As Single ?QdWrE_  
  If ppx = p1x And ppy = p1y Then .;`AAH'k  
     point_in = True a'yK~;+_9  
     Exit Function S
k\K4  
  End If t)$:0  
  If ppx = p2x And ppy = p2y Then h^(*Tv-!  
     point_in = True 5(Q%XQV*P  
     Exit Function ,uhb~N<  
  End If '$]97b7G  
   If ppx = p3x And ppy = p3y Then 6) [H?Q  
     point_in = True N]=q|D  
     Exit Function y(yHt=r  
  End If 84zSK)=Y  
     XW)lDiJl  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) O23k:=Av  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) YHygo#4=8  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) SP_75BJ
  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 6HWE~`ok6  
    sum = aob + boc + cod + doa lE(HFal0-(  
    If 360.01 > sum And sum > 359.99 Then xHLlMn4M  
       point_in = True ShP^A"Do  
    Else TpwkD_fg  
       point_in = False +.b,AqJ/  
    End If 9`X\6s  
End Function

'得到点半径,得到交点坐标函数 cO+qs[ BQ  
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() +`3)oPV)  
    '求得中心点坐标 BLf>_bUk  
Dim tt As String V]e8a"/[{  
Dim rt(3) As Single Vl=l?A8  
    '判断是否平行 m6\E$;`  
   acx = p3x - p1x B:S>wFE(.  
   acy = p3y - p1y SaAFz&WRl  
   bdx = p4x - p2x .*S#aq4S  
   bdy = p4y - p2y ^Hnb}L  
   If acx * bdy = acy * bdx Then P90yI  
      rt(0) = 0 'ud{m[|  
      Exit Function li'YDtMKCY  
   Else ^]0Pfna+N  
      '判断斜率存在否 o!Ieb  
      If p1x = p3x And p2x <> p4x Then {14fA)`%  
         tt = "ac_n_bd_y" p\tm:QWD;  
      ElseIf p1x <> p3x And p2x = p4x Then *-=(Q`3  
         tt = "ac_y_bd_n" Y^;ovH~ ve  
      ElseIf p1x <> p3x And p2x <> p4x Then N06OvU2>xU  
         tt = "ac_y_bd_y" S.94edQ  
      End If }mYx_=+VX  
    Select Case tt FQ7T'G![  
         Case "ac_n_bd_y" s_OF(o  
            'bd线段方程 BB!THj69a6  
            k_bd = bdy / bdx ,,&*:<Q  
            b_bd = p2y - k_bd * p2x HIR~"It$  
            p_x = p1x vkx7paY_  
            p_y = k_bd * p_x + b_bd 7cT~oV !G_  
         Case "ac_y_bd_n" Xq]w<$  
            'ac线段方程 qYjce]c  
            k_ac = acy / acx "fCu=@i  
            b_ac = p1y - k_ac * p1x ll<Xz((o  
            p_x = p2x 8:c-k|CX  
            p_y = k_ac * p_x + b_ac +\c5]`  
        Case "ac_y_bd_y" F|o:W75  
           'ac，bd线段都要求 fF$<7O)+]  
           k_ac = acy / acx 0w\
zLU  
           b_ac = p1y - k_ac * p1x U9:zVy  
           k_bd = bdy / bdx ,]ma+(|  
           b_bd = p2y - k_bd * p2x D3Ig>gKo?m  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) 0d"[l@UU0  
           p_y = k_ac * p_x + b_ac nwB_8mN|  
        End Select 4n!aW?%  
      rt(1) = p_x 4$iz4U:P  
      rt(2) = p_y LqoB 10Kc\  
     F3v!AvA|  
'计算最大半径 B:;pvW]  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) U0 Yll4E  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) b8`)y<7  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) M=.n7RY-  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 7a=gH2]&  
Dim bb(5) As Single VgG0VM  
  bb(1) = rr1 W#4 7h7M  
  bb(2) = rr2 +eWQa`g  
  bb(3) = rr3 =)H.cuc  
  bb(4) = rr4 @Q ]
=\N:  
  nb = rr1 7 S#J>*  
For i = 1 To 4 *v jmy/3  
    If nb <= bb(i) Then 55nlg>j  
       nb = bb(i) JgKO|VO  
    End If -LoZs ru  
Next i RE7?KR>  
    rt(0) = Sqr(nb) uB]7G0g:  
    rr = rt() ~:rl=o}  
  End If Z58X5"  
         {3>$[bT  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  F#3Q_G^/  

SpIv#?  
有热压工艺方面的人才或者资料分享下； |QF7 uV  
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 &pxg. 3  

高手真多！

楼主威武霸气.