[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： pUQ/03dp  
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图片:2.jpg

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关键点说几个： AQ,' 6F9  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） >_-s8t=|  
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 l3Q(TH~I  
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 %,}A@H,  

以下是几个重要的函数： cdl&9-}  
1.判断点在区域中函数 a!7A_q8M  
2.计算夹角函数 ~J wb`g.  
3.转置函数 v&Yi  
4.得到区域中心点，及区域半径函数 .w=/+TA  
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） 
aQ?/%\>  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 ]'!f28Ng-  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single nBjqTud  
   cax = x2 - x1 vM*-D{  
   cay = y2 - y1 p Dx1z|@z  
   cbx = x2 - x3 c}Ft^Il  
   cby = y2 - y3 w28o}$b`  
   mo_jj = cax * cbx + cay * cby z1PBM
SG  
   mo_ca = Sqr(cax * cax + cay * cay) bf ]f=;.+  
   mo_cb = Sqr(cbx * cbx + cby * cby) 2,$8icM  
   cos_acb = mo_jj / (mo_ca * mo_cb) R]}}$R`j  
   'ff_cos = cos_acb ,&]S(|2%>t  
   If cos_acb >= 1 Then +%zAQeb  
   nn = 0 =x%dNf$e{W  
   ElseIf cos_acb <= -1 Then _E&A{HkJ  
   nn = 3.14159265258979 lGPUIoUo  
   Else c]x1HvPE  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) nt 81Bk=  
   End If 1n >X[! 8x  
   'ff_angle = nn 3GaQk-  
   ff_angle = nn * 180 / 3.14159265258979 a,@]8r-"  
End Function

'判断点在区域内函数 =e/9&993  
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 9oyE$S h]  
Dim aob, boc, cod, doa, sum As Single V, Z|tB^  
  If ppx = p1x And ppy = p1y Then 7]U"Z*  
     point_in = True Ye"o6_U"  
     Exit Function Ttu2skcv  
  End If 1Ce@*XBU  
  If ppx = p2x And ppy = p2y Then (7mAt3n k  
     point_in = True &vo--V1|  
     Exit Function 09X01X[  
  End If _7Rr=_1}  
   If ppx = p3x And ppy = p3y Then Jv>gwV{  
     point_in = True :By?O"LQ  
     Exit Function 6_J$UBT
 
  End If j-4VB_
N@  
     *"+=K,#D  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 0ZT5bg_M  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) G! ]k#.^A,  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) Nh8Q b/::  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) X@$f$=  
    sum = aob + boc + cod + doa Upc+Ukw  
    If 360.01 > sum And sum > 359.99 Then |8&,b`Gfo  
       point_in = True X}=n:Ql'YY  
    Else "W=AB&  
       point_in = False (X $=Q6  
    End If -MW_|MG  
End Function

'得到点半径,得到交点坐标函数 cQ/5
qg  
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() &Lt}=3G  
    '求得中心点坐标 C\3y
{s  
Dim tt As String '{a/2
l  
Dim rt(3) As Single vX{J' H]u  
    '判断是否平行 w:%o?pKet1  
   acx = p3x - p1x A'j;\ `1  
   acy = p3y - p1y $LKIT0  
   bdx = p4x - p2x ~?D4[D|sB  
   bdy = p4y - p2y Te.Y#lCT$  
   If acx * bdy = acy * bdx Then m`v2: S}  
      rt(0) = 0 NhfJ30~  
      Exit Function 5\N(PL  
   Else 3 *d"B tg  
      '判断斜率存在否 O}tZ - 'T  
      If p1x = p3x And p2x <> p4x Then SHvq.lYJ  
         tt = "ac_n_bd_y" ZW-yP2  
      ElseIf p1x <> p3x And p2x = p4x Then D!Q">6_"z  
         tt = "ac_y_bd_n" *v;!-F&8>  
      ElseIf p1x <> p3x And p2x <> p4x Then ST2.:v;lb  
         tt = "ac_y_bd_y" C+?Hm1  
      End If ,`wXg  
    Select Case tt  +EFgE1w  
         Case "ac_n_bd_y" m#8m] Y  
            'bd线段方程 :}yi-/_8!  
            k_bd = bdy / bdx *meZ8DV2DH  
            b_bd = p2y - k_bd * p2x `k=bL"T>\  
            p_x = p1x K\>tA)IPSV  
            p_y = k_bd * p_x + b_bd N/]o4o  
         Case "ac_y_bd_n" q`|LRz&al  
            'ac线段方程 *YW/_  
            k_ac = acy / acx r>dwDBE  
            b_ac = p1y - k_ac * p1x &J55P]7w  
            p_x = p2x ZtV9&rd7  
            p_y = k_ac * p_x + b_ac YsG%6&zEq  
        Case "ac_y_bd_y" 3b*cU}go  
           'ac，bd线段都要求 6,"IDH|ND  
           k_ac = acy / acx \qR7mI/*  
           b_ac = p1y - k_ac * p1x d{rQzia"mV  
           k_bd = bdy / bdx guX 9}  
           b_bd = p2y - k_bd * p2x @xQgY*f#  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) LG-y]4a}  
           p_y = k_ac * p_x + b_ac 0n@rLF  
        End Select DamCF  
      rt(1) = p_x 3j,Q`+l/6d  
      rt(2) = p_y 'Hc-~l>D  
     2]I4M[|&z  
'计算最大半径 Cnnh7`  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 5 elw~u  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) i#7DR>XF/  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y)  gG uZ8:f  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) qgE 73.!`6  
Dim bb(5) As Single ^w(p8G_-w  
  bb(1) = rr1 W [Of|?  
  bb(2) = rr2 [!!o-9b  
  bb(3) = rr3 ;E@G`=0St  
  bb(4) = rr4 e.]KL('  
  nb = rr1 t/ +=|*  
For i = 1 To 4 tDSJpW'd  
    If nb <= bb(i) Then '=[?~0(B  
       nb = bb(i) M54j@_81pX  
    End If Ks=>K(V6  
Next i .9R [*<  
    rt(0) = Sqr(nb) S7=Bd[4  
    rr = rt() i\1TOP|h  
  End If #rxVd 7f  
         umD!
2 w  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  G2t;DN(  

'rMN=1:iu"  
有热压工艺方面的人才或者资料分享下； L,mQ   
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 *.\  

高手真多！

楼主威武霸气.