[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： z$YOV"N  
c2F`S1Nu<  
sY#K=5R  

关键点说几个： nC*/?y*9  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） {Rz`)qqE  
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 -51L!x}1c  
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 IM@Qe|5  

以下是几个重要的函数： Ri3m438  
1.判断点在区域中函数 Nyo6
R9^  
2.计算夹角函数 h*KhH>\  
3.转置函数 Uexb>|  
4.得到区域中心点，及区域半径函数 {C6Yr9  
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） +HcH]D;  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 5eU/ [F9  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single XNl!(2x'pb  
   cax = x2 - x1 Kfr?sX  
   cay = y2 - y1 kP6r=HH@  
   cbx = x2 - x3 V]8fn MH  
   cby = y2 - y3 4 I~,B[|  
   mo_jj = cax * cbx + cay * cby ULJI`I|m  
   mo_ca = Sqr(cax * cax + cay * cay) S%4hv*_c  
   mo_cb = Sqr(cbx * cbx + cby * cby)
FStfGN  
   cos_acb = mo_jj / (mo_ca * mo_cb) ox*Ka]  
   'ff_cos = cos_acb W=b5{ 6  
   If cos_acb >= 1 Then zz9.OnZ~  
   nn = 0 ?L $KlF Y  
   ElseIf cos_acb <= -1 Then ,yT4(cMBk?  
   nn = 3.14159265258979 y>o#Hq&qM  
   Else [J];  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) *kIJv?%_}  
   End If &sKYO<6K}  
   'ff_angle = nn Ry(!<w,  
   ff_angle = nn * 180 / 3.14159265258979 PM|K*,3J  
End Function

'判断点在区域内函数 g7H;d  
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 ^NCH)zK]v  
Dim aob, boc, cod, doa, sum As Single AV'>  
  If ppx = p1x And ppy = p1y Then tQ/w\6{  
     point_in = True
wS5hXTb"  
     Exit Function dfrq8n]  
  End If -py.YZ  
  If ppx = p2x And ppy = p2y Then
kSJWQ  
     point_in = True $""[( d?0  
     Exit Function z(m*]kpL"  
  End If "au"\}   
   If ppx = p3x And ppy = p3y Then 87HVD Di  
     point_in = True "<&F=gV  
     Exit Function o+nU{  
  End If OVd"'|&6_  
     hsl8@=_ B  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) ;?y?s'>t&  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) @NVq .z  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) vxwctJ&  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) S)~h|&A(  
    sum = aob + boc + cod + doa ~E!"YkIr  
    If 360.01 > sum And sum > 359.99 Then p7k0pS
t  
       point_in = True e88JT_zrO  
    Else hcBfau;r  
       point_in = False p5bH-km6  
    End If s<5t}{x  
End Function

'得到点半径,得到交点坐标函数 KctD=6  
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() ,og@}gOMB  
    '求得中心点坐标 "_(o% \"7  
Dim tt As String u54+oh|,M  
Dim rt(3) As Single 5!5P\o  
    '判断是否平行 k_^d7yH  
   acx = p3x - p1x C[pAa8  
   acy = p3y - p1y pa+y(!G  
   bdx = p4x - p2x g<,|Q5bK  
   bdy = p4y - p2y dJ|]W|q<  
   If acx * bdy = acy * bdx Then }FFW,x  
      rt(0) = 0 f2d"b+H#  
      Exit Function X&McNO6"  
   Else `R; ct4-  
      '判断斜率存在否 [pOU!9v4  
      If p1x = p3x And p2x <> p4x Then eLt6Hg)s`9  
         tt = "ac_n_bd_y" MVTU$
65  
      ElseIf p1x <> p3x And p2x = p4x Then *mBEF"  
         tt = "ac_y_bd_n" <:ZN  
      ElseIf p1x <> p3x And p2x <> p4x Then VE GUhI/d  
         tt = "ac_y_bd_y" 
r67 3+  
      End If N),Zb^~nw  
    Select Case tt r` 3)sc  
         Case "ac_n_bd_y" ?5->F/f&  
            'bd线段方程 :Z/ig%  
            k_bd = bdy / bdx PvA%c<z  
            b_bd = p2y - k_bd * p2x +)V6"XY-(  
            p_x = p1x
O4
}cv  
            p_y = k_bd * p_x + b_bd 8Mp
  
         Case "ac_y_bd_n" FUHjY  
            'ac线段方程 (C. 1'<]  
            k_ac = acy / acx q_W NN/w  
            b_ac = p1y - k_ac * p1x Gud!(5'  
            p_x = p2x !867DX3*  
            p_y = k_ac * p_x + b_ac Ak1f*HGl|  
        Case "ac_y_bd_y" |g7E*1Ie  
           'ac，bd线段都要求 ZkK +?:9  
           k_ac = acy / acx HL_MuyE  
           b_ac = p1y - k_ac * p1x L ~  
           k_bd = bdy / bdx *EDzj&  
           b_bd = p2y - k_bd * p2x PS6G 7  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) zL>nDnL 4  
           p_y = k_ac * p_x + b_ac MLp5Y\8*  
        End Select 6b)1B\p  
      rt(1) = p_x kDm=Cjxv  
      rt(2) = p_y D9Q%*DLd$_  
     @4&sL](q  
'计算最大半径 #_H=pNWe  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) d2 d^XMe!  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) AU >d1S.  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) "cti(0F-d  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 3nG(z>  
Dim bb(5) As Single
EGV@L#  
  bb(1) = rr1 :1AOund  
  bb(2) = rr2 zZA I"\;W  
  bb(3) = rr3 [OMKk#vW  
  bb(4) = rr4 A]>0lB  
  nb = rr1 7$w:~VZ  
For i = 1 To 4 2Yyc`o0R;h  
    If nb <= bb(i) Then %5uuB4P&|$  
       nb = bb(i) mDo]5 i<  
    End If 6)H70VPJ  
Next i txliZ|.O  
    rt(0) = Sqr(nb) )ll}hGS  
    rr = rt() @jjp\~  
  End If 6C  
         n2TvPt\  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  A2F+$N  

CJ KFNa  
有热压工艺方面的人才或者资料分享下； !*EHr09N7  
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 e,8C} 2  

高手真多！

楼主威武霸气.