[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： $!(pF  
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图片:2.jpg

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关键点说几个： JJ'.((  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） /)(#{i*  
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 dJ""XaHqf  
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 rT5Ycm@  

以下是几个重要的函数： sWblFvHqrU  
1.判断点在区域中函数 $3uKw!z  
2.计算夹角函数 k]HEhY  
3.转置函数 p4i]7o@  
4.得到区域中心点，及区域半径函数 ez!C?  
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） Bw6
4  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 'X!?vK^]p  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single (%o2jroQ#  
   cax = x2 - x1 D"ehWLj  
   cay = y2 - y1 F]t(%{#W  
   cbx = x2 - x3 3LTcEd  
   cby = y2 - y3 0#*#a13  
   mo_jj = cax * cbx + cay * cby XNb ZNaAd  
   mo_ca = Sqr(cax * cax + cay * cay) 01. &>Duw  
   mo_cb = Sqr(cbx * cbx + cby * cby) g{9+O7q  
   cos_acb = mo_jj / (mo_ca * mo_cb) b-*3 2Y%  
   'ff_cos = cos_acb 4bEf  
   If cos_acb >= 1 Then x5WW--YR+  
   nn = 0 9{8GP  
   ElseIf cos_acb <= -1 Then >ap1"n9k  
   nn = 3.14159265258979 )){9&5,0:  
   Else U}l14  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) .rJiyED?!  
   End If ~ Yngkt  
   'ff_angle = nn gxMfu?zk"  
   ff_angle = nn * 180 / 3.14159265258979 NwR}yb6  
End Function

'判断点在区域内函数 }AvcoD/b  
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 b4""|P?L  
Dim aob, boc, cod, doa, sum As Single 1uk0d`JL  
  If ppx = p1x And ppy = p1y Then a`u S[r>  
     point_in = True rUjdq/I:Z  
     Exit Function ~b|`'kU  
  End If E|$Oha[  
  If ppx = p2x And ppy = p2y Then `O8b1-1q~  
     point_in = True :aIN9;  
     Exit Function ,*@AX>  
  End If ?P7]u>H  
   If ppx = p3x And ppy = p3y Then gxGrspqg  
     point_in = True U70]!EaT  
     Exit Function mG1IQ!  
  End If sW^a`VM  
     KYxBVgJ  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) >u(>aV|A  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) eb8w~  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) a%Jx `hx  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 9lo[&^<  
    sum = aob + boc + cod + doa ;!T{%-tP  
    If 360.01 > sum And sum > 359.99 Then f0LP?]  
       point_in = True HOp-P8z  
    Else 1Fi86  
       point_in = False g3%t8O/M  
    End If -gz0md|Y  
End Function

'得到点半径,得到交点坐标函数 I6L
D)?  
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() |k{-l!HI  
    '求得中心点坐标 Y#01o&f0n  
Dim tt As String jec:i-,  
Dim rt(3) As Single '7im  
    '判断是否平行 W:QwHZ2O  
   acx = p3x - p1x K$REZe  
   acy = p3y - p1y s-VSH  
   bdx = p4x - p2x mi2o1"Jd$`  
   bdy = p4y - p2y ".~{:=  
   If acx * bdy = acy * bdx Then 7nHTlI1b  
      rt(0) = 0 '?GQ~Bf<>  
      Exit Function y$tX-9U  
   Else p11G#.0  
      '判断斜率存在否 zSjgx_#U  
      If p1x = p3x And p2x <> p4x Then qU[O1bN  
         tt = "ac_n_bd_y" c~dM`2J,  
      ElseIf p1x <> p3x And p2x = p4x Then emA!Ew(g  
         tt = "ac_y_bd_n" 3An(jt$%Q  
      ElseIf p1x <> p3x And p2x <> p4x Then qA/bg  
         tt = "ac_y_bd_y" ?4)v`*  
      End If 1ZKzumF  
    Select Case tt q3'o|pp  
         Case "ac_n_bd_y" |&hU=J o  
            'bd线段方程 f e $Wu  
            k_bd = bdy / bdx c/u_KJFF-n  
            b_bd = p2y - k_bd * p2x i.rU&yT%  
            p_x = p1x /b.oEGqZX  
            p_y = k_bd * p_x + b_bd PtKTm\,JL0  
         Case "ac_y_bd_n" O=jN&<rb  
            'ac线段方程 ur2!#bU9  
            k_ac = acy / acx '
0+$ m=   
            b_ac = p1y - k_ac * p1x vg8O] YF  
            p_x = p2x LBX%HGH  
            p_y = k_ac * p_x + b_ac KC&`x|  
        Case "ac_y_bd_y" ^@}#me@  
           'ac，bd线段都要求 ~r`Wr`]_z  
           k_ac = acy / acx BGjb`U#%3  
           b_ac = p1y - k_ac * p1x FUaNiAr[  
           k_bd = bdy / bdx IF?xnu  
           b_bd = p2y - k_bd * p2x h}=M^SL  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) SQKt}kDbM  
           p_y = k_ac * p_x + b_ac ,sb1"^Wc  
        End Select ?TuI:dC  
      rt(1) = p_x {~GR8 U  
      rt(2) = p_y Ob(leL>ow  
     *e<_; Kr?  
'计算最大半径 \mXqak,y  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) _@ i>s,  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) !.+"4TF  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) 7>x;B  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) KZK,w#9.  
Dim bb(5) As Single )DZTB  
  bb(1) = rr1 56s*A*z$ ;  
  bb(2) = rr2 /Antb6E  
  bb(3) = rr3 /
{G/|a  
  bb(4) = rr4 4 10:%WGc  
  nb = rr1 dB`b9)Tk0z  
For i = 1 To 4 Mj~
${vj  
    If nb <= bb(i) Then 8t9aHla  
       nb = bb(i) <"I
?jgo  
    End If 2xmT#m  
Next i UpeQOC  
    rt(0) = Sqr(nb) YZ[%uArm  
    rr = rt() 0QR.   
  End If ;?8Iys#  
         Ve14rn  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  n=r=u'oi  

dgm+U%E  
有热压工艺方面的人才或者资料分享下； ZG!x$yi$  
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 j@_nI~7f}  

高手真多！

楼主威武霸气.