[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： 1OJ*wI*  
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关键点说几个： \=!H2M  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） p jKt:R}  
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 y"^yYO  
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 G02ox5X  

以下是几个重要的函数： BhKO_wQ?:J  
1.判断点在区域中函数 pOm@b`S%  
2.计算夹角函数 &=6%
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3.转置函数 }A|))Ao
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4.得到区域中心点，及区域半径函数 McjS)4j&.  
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） %3M95UZ2  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 $A`xhh[  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single ^'vIOq-1v  
   cax = x2 - x1 o/cr{>"N  
   cay = y2 - y1 jYWw.g<  
   cbx = x2 - x3 H"+wsM^@  
   cby = y2 - y3 $jG4pPG  
   mo_jj = cax * cbx + cay * cby FI{AZb_'  
   mo_ca = Sqr(cax * cax + cay * cay) cZ|lCy^  
   mo_cb = Sqr(cbx * cbx + cby * cby) x=-0zV  
   cos_acb = mo_jj / (mo_ca * mo_cb)  %[`a  
   'ff_cos = cos_acb xuUx4,Z  
   If cos_acb >= 1 Then tMFsA`ng  
   nn = 0 ^av6HFQ  
   ElseIf cos_acb <= -1 Then 'wZ_4XjD  
   nn = 3.14159265258979 EMlIxpCn:  
   Else ?,07;>&  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) T C8`JU=wV  
   End If Vl<9=f7[  
   'ff_angle = nn 5Z{_m;I.  
   ff_angle = nn * 180 / 3.14159265258979 R"+wih  
End Function

'判断点在区域内函数 q8xd*--#  
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 GK?4@<fY  
Dim aob, boc, cod, doa, sum As Single ~Ky4+\6o>  
  If ppx = p1x And ppy = p1y Then )(m0cP{7  
     point_in = True m`6VKp{YD  
     Exit Function >A}0Ho  
  End If |QMA@Mx  
  If ppx = p2x And ppy = p2y Then dz%EM8  
     point_in = True 6~8F!b2  
     Exit Function cin2>3Z$  
  End If CzVmNy)kl  
   If ppx = p3x And ppy = p3y Then cp6WMHLj   
     point_in = True VWi2(@R^  
     Exit Function %=Tr^{i  
  End If i sW\MB]  
     i]o"_=C  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) s0C:m  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) p[v#EyoC  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) WeMAe w/d  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 3f
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    sum = aob + boc + cod + doa >w|*ei:@S  
    If 360.01 > sum And sum > 359.99 Then M#,Q ^rH#  
       point_in = True ".U^ifF  
    Else x83a!9  
       point_in = False A\QJLWBv^$  
    End If (\,BxvhG=  
End Function

'得到点半径,得到交点坐标函数 _yH`t[  
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() iL]'y\?lv  
    '求得中心点坐标 D'_Bz8H!p  
Dim tt As String e8P-k3a"5:  
Dim rt(3) As Single y\c"b-lQX  
    '判断是否平行 zsXpA0~3s  
   acx = p3x - p1x _\8qwDg"#e  
   acy = p3y - p1y _.V?A*  
   bdx = p4x - p2x c EnkU]  
   bdy = p4y - p2y [xZU!=  
   If acx * bdy = acy * bdx Then kkCZNQ~I  
      rt(0) = 0 x/fX`y|(}*  
      Exit Function +T{'V^  
   Else )2e#HBnH  
      '判断斜率存在否 Ao9R:|9  
      If p1x = p3x And p2x <> p4x Then C$yq\C+I  
         tt = "ac_n_bd_y" <skajQQ  
      ElseIf p1x <> p3x And p2x = p4x Then l$xxrb9P!  
         tt = "ac_y_bd_n" ,*svtw:2')  
      ElseIf p1x <> p3x And p2x <> p4x Then G"SBYU  
         tt = "ac_y_bd_y" Wp0 Dq(  
      End If 2 QTZwx  
    Select Case tt tt_o$D~kg  
         Case "ac_n_bd_y" s5&@Cxzl  
            'bd线段方程 *OjKcs  
            k_bd = bdy / bdx 'lz"2@4{  
            b_bd = p2y - k_bd * p2x m#!=3P7T  
            p_x = p1x f9u^R=Ff[  
            p_y = k_bd * p_x + b_bd U7@AC}.+  
         Case "ac_y_bd_n" H^%lDz  
            'ac线段方程 PmpNAVE'  
            k_ac = acy / acx zYER  
            b_ac = p1y - k_ac * p1x ?~e
3&ux  
            p_x = p2x u{<"NR h  
            p_y = k_ac * p_x + b_ac 3VO2,PCZ  
        Case "ac_y_bd_y" (!L5-8O  
           'ac，bd线段都要求 Kv&g5&N,  
           k_ac = acy / acx }T2xXbU  
           b_ac = p1y - k_ac * p1x 8IQtz2  
           k_bd = bdy / bdx (2ot5x}`j  
           b_bd = p2y - k_bd * p2x %r\n%$@_  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) =wWpP-J&  
           p_y = k_ac * p_x + b_ac :M3oUE{  
        End Select N2r/ho}8  
      rt(1) = p_x b}^S.;vNj  
      rt(2) = p_y BR`ygrfe  
     x
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'计算最大半径 1Na@|yY  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 1/+C5Bp*  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) =WbOwI)u  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) zET^T5>:  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) yF}OfK?0f  
Dim bb(5) As Single s9;#!7ms  
  bb(1) = rr1 7,qYV}  
  bb(2) = rr2 olB)p$aH#  
  bb(3) = rr3 >^Q&nkB"B  
  bb(4) = rr4 .~A*=  
  nb = rr1 B(a-
k?  
For i = 1 To 4 !3n)|~r;K  
    If nb <= bb(i) Then jd]s<C3o  
       nb = bb(i) b \KL;H/  
    End If }U~6^2 .,  
Next i ,_aM`%q?Fj  
    rt(0) = Sqr(nb) bK"SKV  
    rr = rt() E:sz$\Ht)  
  End If -C-?`R  
         (s<Dd2&.H  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  J_>w3uY  

?Ma~^0  
有热压工艺方面的人才或者资料分享下； `ptj?6N-  
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 .{;Y'Zc14S  

高手真多！

楼主威武霸气.