[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： 'i|YlMFIg  
5146kp|1  
XfIJ4ZM5  

关键点说几个： [0("Q;Ec[j  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） j3ls3H&  
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 +:/%3}
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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 \cM2k-  

以下是几个重要的函数： *lJxH8\  
1.判断点在区域中函数 :
.`2^  
2.计算夹角函数 uCB=u[]y4  
3.转置函数 'dc#F3  
4.得到区域中心点，及区域半径函数 u_Z+;{]Pj  
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） >+T)#.wo&  
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.4m|f0;  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single {Y1Ck5  
   cax = x2 - x1 0PCGDLk8  
   cay = y2 - y1 ]eV8b*d6  
   cbx = x2 - x3 r: :b  
   cby = y2 - y3 MnHNjsO#  
   mo_jj = cax * cbx + cay * cby X5w$4Kj&4l  
   mo_ca = Sqr(cax * cax + cay * cay) A]3k4DLYS  
   mo_cb = Sqr(cbx * cbx + cby * cby) cidP|ie^  
   cos_acb = mo_jj / (mo_ca * mo_cb) iN.n8MN=I  
   'ff_cos = cos_acb \ B%+fw  
   If cos_acb >= 1 Then TkF[x%o  
   nn = 0 Pc]HP  
   ElseIf cos_acb <= -1 Then 1x
x}~|F?|  
   nn = 3.14159265258979 5~S5F3  
   Else Zb#u0Tq  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) @PIp*[7oC  
   End If NX&_p!_V  
   'ff_angle = nn {2gwk8  
   ff_angle = nn * 180 / 3.14159265258979 -I%5$`z  
End Function

'判断点在区域内函数 7mfS*aCb  
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 ,iwp,=h=  
Dim aob, boc, cod, doa, sum As Single /<BI46B\  
  If ppx = p1x And ppy = p1y Then OB}Ib]  
     point_in = True EEL,^3KR  
     Exit Function m)D|l1AtF  
  End If wS3'?PRX  
  If ppx = p2x And ppy = p2y Then ,wPr"U+7  
     point_in = True <\S:'g"(  
     Exit Function HLi%%"'  
  End If q75
s#[<ap  
   If ppx = p3x And ppy = p3y Then {fp[BF  
     point_in = True )=-szJjXZ  
     Exit Function 7>*vI7O0l  
  End If ,"0:3+(8;  
     [a<SDMR  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) -D~%|).
'  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) Z$? #  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) {(?4!rh  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) -H-~;EzU  
    sum = aob + boc + cod + doa 7cMv/g^h@  
    If 360.01 > sum And sum > 359.99 Then 3T0"" !Q  
       point_in = True 28u_!f[  
    Else UR5`ue ;  
       point_in = False {+b7sA3
 
    End If mXs; b 2r^  
End Function

'得到点半径,得到交点坐标函数 h2J x]FJ  
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() ZqO^f*F>h  
    '求得中心点坐标 R0-j5&^jju  
Dim tt As String y1L,0 ]  
Dim rt(3) As Single ,5<Cd,`*  
    '判断是否平行 |]*/R^1>2  
   acx = p3x - p1x ,~W|]/b<q  
   acy = p3y - p1y VJll  
   bdx = p4x - p2x lks!w/yCF  
   bdy = p4y - p2y D^;Uq8NDKq  
   If acx * bdy = acy * bdx Then E8&TO~"a]e  
      rt(0) = 0 @7n"yp*"  
      Exit Function h@@=M  
   Else "C`Ub  
      '判断斜率存在否 Pk)1WK7E  
      If p1x = p3x And p2x <> p4x Then R*r#E{!V;  
         tt = "ac_n_bd_y" 8}| (0mC  
      ElseIf p1x <> p3x And p2x = p4x Then Thit  
         tt = "ac_y_bd_n" )53y AyP  
      ElseIf p1x <> p3x And p2x <> p4x Then 8)I^ t81
 
         tt = "ac_y_bd_y" @f_+=}|dc  
      End If L*JjG
sTH  
    Select Case tt  ;4~hB  
         Case "ac_n_bd_y" Y:a]00&)#Y  
            'bd线段方程 N]sAji*  
            k_bd = bdy / bdx B^9j@3Ux  
            b_bd = p2y - k_bd * p2x ?6Y?a2 |  
            p_x = p1x 3m)y|$R  
            p_y = k_bd * p_x + b_bd -3Vx76Y  
         Case "ac_y_bd_n" |
$b}L7_  
            'ac线段方程
s->^=dy  
            k_ac = acy / acx V "h +L7T  
            b_ac = p1y - k_ac * p1x J/*`7Pd  
            p_x = p2x c0u^zH<  
            p_y = k_ac * p_x + b_ac [ibu/W$  
        Case "ac_y_bd_y" | %Vh`HT  
           'ac，bd线段都要求 n.(FQx.F  
           k_ac = acy / acx 'b{]:Y  
           b_ac = p1y - k_ac * p1x D d</`iUq  
           k_bd = bdy / bdx C~iL3Cb  
           b_bd = p2y - k_bd * p2x CzEd8jeh7  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) @s2y~0}#  
           p_y = k_ac * p_x + b_ac E~oOKQ5W  
        End Select p.?rey<%  
      rt(1) = p_x s-T\r"d=j  
      rt(2) = p_y 9-*uPK]m9  
     L/G6Fjg^  
'计算最大半径 ^.NU|NQi'  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) t{vJM!kdlQ  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) ZExlGC  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) B_m8{44zM  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) OpYY{f  
Dim bb(5) As Single W9GVt$T7  
  bb(1) = rr1 hZ  
  bb(2) = rr2 I&W
=Q[m  
  bb(3) = rr3 _"rgET`vW  
  bb(4) = rr4 @2 fg~2M1  
  nb = rr1 f=K]XTw~  
For i = 1 To 4 ut7zVp<"  
    If nb <= bb(i) Then ^3L0w
}#  
       nb = bb(i) SKsKPqz  
    End If N5b!.B x-w  
Next i OYTkV}tG  
    rt(0) = Sqr(nb) )|=j`jCC  
    rr = rt() &FN.:_E  
  End If @i IRmQ  
         L0WN\|D  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  sfugY(m  

o&)8o5  
有热压工艺方面的人才或者资料分享下； MK
D
1V8i  
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 +`3)oPV)  

高手真多！

楼主威武霸气.