[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： vl"w,@V7  
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~wvt:E,fC  

关键点说几个： %go2tv:|W  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） Y"Cf84E  
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 ke4E1T-1n  
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 #NS|9jW  

以下是几个重要的函数： 5cSiV7#Y:  
1.判断点在区域中函数 LC%ococ  
2.计算夹角函数 c4JV~VS+  
3.转置函数 <2$vo  
4.得到区域中心点，及区域半径函数 '-iEbE  
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） vygzL U^  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 z@*E=B1L  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single f|[7LIdh-  
   cax = x2 - x1 bI):-2&s}  
   cay = y2 - y1 {u'szO}k  
   cbx = x2 - x3 [xS7ae  
   cby = y2 - y3 qu=~\t1[6  
   mo_jj = cax * cbx + cay * cby ?N#I2jxaD  
   mo_ca = Sqr(cax * cax + cay * cay) ]so/AdT9hA  
   mo_cb = Sqr(cbx * cbx + cby * cby) %~rEJB@{  
   cos_acb = mo_jj / (mo_ca * mo_cb) oD)x\ )t8  
   'ff_cos = cos_acb n,N->t$i  
   If cos_acb >= 1 Then v{u3[c   
   nn = 0 fSo8O  
   ElseIf cos_acb <= -1 Then ]OAU&t{  
   nn = 3.14159265258979 Cbbdq%ySI  
   Else 1p&.\^  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) ,Py\Cp=Dw  
   End If H2X_WSwm  
   'ff_angle = nn \GFqRRn  
   ff_angle = nn * 180 / 3.14159265258979 :1'  
End Function

'判断点在区域内函数 I|X`9  
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 &3vm @  
Dim aob, boc, cod, doa, sum As Single Kz'GAm\  
  If ppx = p1x And ppy = p1y Then ak7%  
     point_in = True D#GuF~-F!R  
     Exit Function v
o/x`F'ib  
  End If LkbD='\=  
  If ppx = p2x And ppy = p2y Then >+O0W)g{o  
     point_in = True ~Wrp
JjI[  
     Exit Function oodA&0{)d  
  End If ~d*Q{v~3  
   If ppx = p3x And ppy = p3y Then [^"}jbn/  
     point_in = True {_7hX`p  
     Exit Function lMv6QL\>'  
  End If FSuC)Xg  
     175e:\Tw  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) z~{08M7  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) HT7,B(.}  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) (Mv~0ShakO  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) Dj/Hz\  
    sum = aob + boc + cod + doa L15)+^4n  
    If 360.01 > sum And sum > 359.99 Then ZayJllaq^  
       point_in = True .ATpwFal  
    Else 0fc;H}B*  
       point_in = False m"L^tSD~  
    End If 7mt
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End Function

'得到点半径,得到交点坐标函数 :ok.[q  
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() G[}v?RLI  
    '求得中心点坐标 % jDH{xSMb  
Dim tt As String 8Hq4
ppC  
Dim rt(3) As Single KKwM\  
    '判断是否平行 RIkIE=+6  
   acx = p3x - p1x 8kKL=  
   acy = p3y - p1y NG3?OAQTw  
   bdx = p4x - p2x 8{Wl  
   bdy = p4y - p2y {?
Slo5X|  
   If acx * bdy = acy * bdx Then SY95s  
      rt(0) = 0 _J*l,]}S  
      Exit Function A}"|_&E  
   Else nLL2/!'n  
      '判断斜率存在否 u.E>d9  
      If p1x = p3x And p2x <> p4x Then ^
aqQw u  
         tt = "ac_n_bd_y" ;9~YQW@|  
      ElseIf p1x <> p3x And p2x = p4x Then qFVZhBC  
         tt = "ac_y_bd_n" 27}:f?2hbJ  
      ElseIf p1x <> p3x And p2x <> p4x Then >QDyG8*  
         tt = "ac_y_bd_y" V 2Xv)  
      End If f0eQq;D$K  
    Select Case tt f (C:J[;Z  
         Case "ac_n_bd_y" 5]mH.{$x$?  
            'bd线段方程 1GA.c:  
            k_bd = bdy / bdx  /$93#$  
            b_bd = p2y - k_bd * p2x 7(5d$W  
            p_x = p1x uj;iE 9  
            p_y = k_bd * p_x + b_bd HFB>0<$  
         Case "ac_y_bd_n" y%|Ez  
            'ac线段方程 w#2apaz  
            k_ac = acy / acx xlcCL?qQj  
            b_ac = p1y - k_ac * p1x !UT!PX)  
            p_x = p2x 46M=R-7=  
            p_y = k_ac * p_x + b_ac Ri"rT] '  
        Case "ac_y_bd_y" `D3q!e  
           'ac，bd线段都要求 ys!O"=OJ  
           k_ac = acy / acx ?taC !{  
           b_ac = p1y - k_ac * p1x 9t`yv@.>N  
           k_bd = bdy / bdx NXLb'm
H~  
           b_bd = p2y - k_bd * p2x xqdkc^b  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) A46dtFD{  
           p_y = k_ac * p_x + b_ac g3s5ra[
 
        End Select Q?hf2iw  
      rt(1) = p_x bv41et+Kb  
      rt(2) = p_y TlO=dLR7d  
     ZYY`f/qi  
'计算最大半径 ;7[DFlS\P  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) nUs=PD3)  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) 8\nka5  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) "#36-  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) f7zB_hVDmE  
Dim bb(5) As Single Ww~C[8q  
  bb(1) = rr1 W rT_7  
  bb(2) = rr2 @@a#DjE%/  
  bb(3) = rr3 ?gu!P:lZS  
  bb(4) = rr4 UQhD8Z'I.  
  nb = rr1 Y8}y
0]V  
For i = 1 To 4 zgS)j9q}  
    If nb <= bb(i) Then RK*tZ  
       nb = bb(i) XiV*d06{  
    End If 3f>9tUWhTy  
Next i Q?.9BM1V  
    rt(0) = Sqr(nb) E690'\)31  
    rr = rt() {OQ)Np!  
  End If F" G+/c/L  
         cEXd#TlY~X  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  Z%{`j!!p  

2"
Ki5  
有热压工艺方面的人才或者资料分享下； |kHzp^S  
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 m.yt?`  

高手真多！

楼主威武霸气.