[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： 5 +9Ze9  
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关键点说几个： w&&2H8  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） P%pp )BS  
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 )8gGv  
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 lEL78l.  

以下是几个重要的函数： }|)R   
1.判断点在区域中函数 M s9E@E  
2.计算夹角函数 k4J8O3E  
3.转置函数 USJ
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4.得到区域中心点，及区域半径函数 pfuW  
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） gv15t'y9  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 `D7C?M#j]  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single "tit\a6\(  
   cax = x2 - x1 dth&?/MERL  
   cay = y2 - y1 Rn%N&1 Ef  
   cbx = x2 - x3 ',7??Q7j&v  
   cby = y2 - y3 f},oj4P\  
   mo_jj = cax * cbx + cay * cby 0X2@CPIFf  
   mo_ca = Sqr(cax * cax + cay * cay) 2g{)AtK$#  
   mo_cb = Sqr(cbx * cbx + cby * cby) |iFVh$N  
   cos_acb = mo_jj / (mo_ca * mo_cb) t
L SN`6[:  
   'ff_cos = cos_acb 9ch#}/7B  
   If cos_acb >= 1 Then YKZrEP4^  
   nn = 0 TOF '2&H  
   ElseIf cos_acb <= -1 Then k#TYKft  
   nn = 3.14159265258979 >Y 1{rSk  
   Else `[#x_<\t  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) $$Vt7"F  
   End If X#a`K]!B  
   'ff_angle = nn Wm'QP4`  
   ff_angle = nn * 180 / 3.14159265258979 9&%fq)gS  
End Function

'判断点在区域内函数 nm$Dd~mxW1  
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 BIaDY<j90  
Dim aob, boc, cod, doa, sum As Single QlFZO4 P3|  
  If ppx = p1x And ppy = p1y Then <BWkUZz\P|  
     point_in = True /5AW?2)  
     Exit Function ub0zJTFJ#  
  End If Mkp/0|Q*  
  If ppx = p2x And ppy = p2y Then 1RLY $M  
     point_in = True <O?y-$~  
     Exit Function sH,kW|D  
  End If MJ<Jb,D1  
   If ppx = p3x And ppy = p3y Then $!vxVs9n  
     point_in = True Sydh2d  
     Exit Function (%CZ*L[9Z  
  End If E9j+o y  
     J`M&{UP  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 1:C:?ZC#c  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) _s,ao'/  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) %sh>;^58P  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) _eSdnHWx  
    sum = aob + boc + cod + doa ,?UM;^  
    If 360.01 > sum And sum > 359.99 Then i[C~5}%  
       point_in = True 4:3rc
7_ 1  
    Else F+UG'4%  
       point_in = False e
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    End If >!e<}84b  
End Function

'得到点半径,得到交点坐标函数 t9gfU5?  
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() lLq<xf  
    '求得中心点坐标 ->z54 T  
Dim tt As String ))D:8l@  
Dim rt(3) As Single i=a-<A5x  
    '判断是否平行 =rA~7+}  
   acx = p3x - p1x \b V6@#,  
   acy = p3y - p1y Bm$"WbOq*R  
   bdx = p4x - p2x KAA-G2%M  
   bdy = p4y - p2y /StTb,  
   If acx * bdy = acy * bdx Then c'6g*%2k  
      rt(0) = 0 MvLs%GE%  
      Exit Function ] H~4  
   Else vgt]:$  
      '判断斜率存在否 c:S] R"  
      If p1x = p3x And p2x <> p4x Then ]G.%Ty  
         tt = "ac_n_bd_y" 'k;4j|<  
      ElseIf p1x <> p3x And p2x = p4x Then .JX EK  
         tt = "ac_y_bd_n" +[@z(N-h  
      ElseIf p1x <> p3x And p2x <> p4x Then
e"]8T},  
         tt = "ac_y_bd_y" MfO:m[s  
      End If f|A riM  
    Select Case tt U/ V  
         Case "ac_n_bd_y" gXT9 r' k  
            'bd线段方程 +:=(#Y  
            k_bd = bdy / bdx m`#Od^vk  
            b_bd = p2y - k_bd * p2x yw[#  
            p_x = p1x 7 J^rv9i4  
            p_y = k_bd * p_x + b_bd 7qOa ;^T  
         Case "ac_y_bd_n" rt3qdk5U  
            'ac线段方程 .LVQx  
            k_ac = acy / acx 3P~o"a>  
            b_ac = p1y - k_ac * p1x o56`  
            p_x = p2x n8=5-7UT  
            p_y = k_ac * p_x + b_ac TlAR.cV  
        Case "ac_y_bd_y" Xdi:1wW@p  
           'ac，bd线段都要求 c0c|z Ym  
           k_ac = acy / acx d\MLOXnLq;  
           b_ac = p1y - k_ac * p1x 76tdJ!4Z  
           k_bd = bdy / bdx Vt^3iX{!  
           b_bd = p2y - k_bd * p2x Sw^X2$h  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) !f>d_RG  
           p_y = k_ac * p_x + b_ac f-6vLX\Vu  
        End Select Rtb :nJ8  
      rt(1) = p_x ^ PI
5L  
      rt(2) = p_y ELrsx{p:  
     nKR{ug>I)  
'计算最大半径 J{[n?/A{  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) HS'Vi9  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) I`[i;U{CK  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) 5tJ,7
Y'  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) hPq%Lc  
Dim bb(5) As Single }nt* [:%  
  bb(1) = rr1 d@w~[b  
  bb(2) = rr2 Vc^HVyAx@n  
  bb(3) = rr3 Yw _+`,W   
  bb(4) = rr4 ]v[|B  
  nb = rr1 u4z&!MT}  
For i = 1 To 4 a`Gx=8  
    If nb <= bb(i) Then ,F&g5'  
       nb = bb(i) 5<
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    End If wB'zuPAK6  
Next i *5tO0_L  
    rt(0) = Sqr(nb) xI,2LGO  
    rr = rt() '65LKD  
  End If YV=QF J'  
         pEECHk  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  H#ClIh?'b  

T0]MuIJ).  
有热压工艺方面的人才或者资料分享下； v+99 -.  
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 Uix6GT;  

高手真多！

楼主威武霸气.