[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： a|}v?z\  
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描述:请输入描述

图片:2.jpg

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关键点说几个： Mo'6<"x  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） TmviYP gb  
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 cG)U01/"  
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 k'6x_ G  

以下是几个重要的函数： jjT)3 c:J[  
1.判断点在区域中函数 2 xE+"?0  
2.计算夹角函数 6N\f>c  
3.转置函数 F:~k4uTW\b  
4.得到区域中心点，及区域半径函数 1[] 9EJ  
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） q<XleC  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 @ JfQ}`  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single ugV/#v O  
   cax = x2 - x1 [QDM_n  
   cay = y2 - y1 `E2RW{$A  
   cbx = x2 - x3 7`J= PG$A  
   cby = y2 - y3 D KRF#*[=d  
   mo_jj = cax * cbx + cay * cby ;q33t%j  
   mo_ca = Sqr(cax * cax + cay * cay) WRqpQEY  
   mo_cb = Sqr(cbx * cbx + cby * cby) BHf7\+Ul  
   cos_acb = mo_jj / (mo_ca * mo_cb) p~yGp]yJ9  
   'ff_cos = cos_acb VmON}bb[zz  
   If cos_acb >= 1 Then ,5}")T["u  
   nn = 0 )}to7r7`  
   ElseIf cos_acb <= -1 Then )mu[ye"p
 
   nn = 3.14159265258979 |.?$:D&6  
   Else R*O<(  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) q0*d*j F0u  
   End If VXO.S)v2J  
   'ff_angle = nn 3Ct)5J  
   ff_angle = nn * 180 / 3.14159265258979 J+uz{  
End Function

'判断点在区域内函数 AvcN,  
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 R6`,}<A]@  
Dim aob, boc, cod, doa, sum As Single aa&\HDh*  
  If ppx = p1x And ppy = p1y Then @DuSii#.S  
     point_in = True YSr
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     Exit Function X< 4f7;]O  
  End If S\0?~l"}  
  If ppx = p2x And ppy = p2y Then ZjveXrx  
     point_in = True W[qQDn!r  
     Exit Function Xcb'qU!2-^  
  End If +jyWqld.K1  
   If ppx = p3x And ppy = p3y Then #@:GLmD%  
     point_in = True /TScYE:$HE  
     Exit Function -"5r-qq*  
  End If LLPbZ9
q  
     /-Y.A<ieN8  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) zXGi  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) ;v m$F251  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) I`q"  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) j7qGZ"8ak  
    sum = aob + boc + cod + doa Y))x'<T'Q  
    If 360.01 > sum And sum > 359.99 Then DS^`:^hv  
       point_in = True ~IQw?a.E  
    Else LfX[(FP  
       point_in = False Rv|X\Wm  
    End If 6
tN!]  
End Function

'得到点半径,得到交点坐标函数 kB=\a(  
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() Qn`Fq,uvL  
    '求得中心点坐标 Yl"l|2 :  
Dim tt As String "U*6?]f  
Dim rt(3) As Single F~x>\?iN  
    '判断是否平行 JQH>{OB  
   acx = p3x - p1x 1(jDBP!8  
   acy = p3y - p1y >=d%t6%(  
   bdx = p4x - p2x %Iv*u sXP  
   bdy = p4y - p2y ?K= X[  
   If acx * bdy = acy * bdx Then W6jdS;3  
      rt(0) = 0 N.?)s.D(  
      Exit Function =v7%IRP5  
   Else []hC*  
      '判断斜率存在否 u9D#5NvGs  
      If p1x = p3x And p2x <> p4x Then /7uAf{  
         tt = "ac_n_bd_y" fl o9iifZ  
      ElseIf p1x <> p3x And p2x = p4x Then oE&#Tl?Vt  
         tt = "ac_y_bd_n" ^'Qe.DW[  
      ElseIf p1x <> p3x And p2x <> p4x Then e<r}{=1w  
         tt = "ac_y_bd_y" %OAvhutS  
      End If eY8rm  
    Select Case tt 3pjK`"Nmz\  
         Case "ac_n_bd_y" y28 e=i  
            'bd线段方程 P:fcbfH+  
            k_bd = bdy / bdx yR[htD`  
            b_bd = p2y - k_bd * p2x =k:yBswi  
            p_x = p1x YOQ>A*@4  
            p_y = k_bd * p_x + b_bd v-!^a_3Ui  
         Case "ac_y_bd_n" WO{ET  
            'ac线段方程 s}bv o  
            k_ac = acy / acx TcOmBKps'  
            b_ac = p1y - k_ac * p1x [xHHm5$  
            p_x = p2x Mh8s@g  
            p_y = k_ac * p_x + b_ac 4Bk9d\z  
        Case "ac_y_bd_y" Yqb3g(0
 
           'ac，bd线段都要求 y-lBaTE9  
           k_ac = acy / acx F-PQ`@ZNW  
           b_ac = p1y - k_ac * p1x _7b' i6-  
           k_bd = bdy / bdx i2X%xYv ^  
           b_bd = p2y - k_bd * p2x Sq[LwJ  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) UB,:won  
           p_y = k_ac * p_x + b_ac pd}Cg'}X  
        End Select WnL7 A:sZ  
      rt(1) = p_x PAS0 D #  
      rt(2) = p_y `]j:''K  
     1`)e}
p&  
'计算最大半径 ][1 iKT  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) R_2T"  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) |:,i  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) &sg~owz  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) -^$`5Rk  
Dim bb(5) As Single P~M<OUg  
  bb(1) = rr1 Ft 6{g JBG  
  bb(2) = rr2 q.!<GqSgb  
  bb(3) = rr3 #}S<O_  
  bb(4) = rr4 Z
~v-@  
  nb = rr1 +jb<=ERV[  
For i = 1 To 4 T&+y~c[au  
    If nb <= bb(i) Then 4x|\xg( l  
       nb = bb(i) si#1sdR  
    End If =:_DXGW2H  
Next i UZx8ozv'  
    rt(0) = Sqr(nb) Qm>2,={h  
    rr = rt() 2`U+ !  
  End If x*!%o(G  
         GBYwS{4  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  vn
gn^2  

5%"sv+iO  
有热压工艺方面的人才或者资料分享下； dg#w!etB  
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 ]v#T9QQN  

高手真多！

楼主威武霸气.