[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： {b"V7vn,  
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图片:2.jpg

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关键点说几个： 6FiI\  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） ?V4?r2$c  
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 b\Y<1EV^
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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 2)Grl;T]s  

以下是几个重要的函数： Wl/oun~o  
1.判断点在区域中函数 {Xb 6wQ"  
2.计算夹角函数 y4PR&^l?g  
3.转置函数 D>|m8-@]  
4.得到区域中心点，及区域半径函数 $l@nk@  
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） epI&R)]   
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 
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Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single V
W:WB.K$  
   cax = x2 - x1 y.(Yh1  
   cay = y2 - y1 xl8=y  
   cbx = x2 - x3 e&sZ]{uD  
   cby = y2 - y3 vikA  
   mo_jj = cax * cbx + cay * cby : 8dQ8p;  
   mo_ca = Sqr(cax * cax + cay * cay) XHs>Q>`  
   mo_cb = Sqr(cbx * cbx + cby * cby) wCw-EGLR  
   cos_acb = mo_jj / (mo_ca * mo_cb) }%Mj`Bh  
   'ff_cos = cos_acb -< D7  
   If cos_acb >= 1 Then 7iMBDkb7  
   nn = 0 m}ZkNWH  
   ElseIf cos_acb <= -1 Then o81RD#>E)  
   nn = 3.14159265258979 ,' V
T75  
   Else eB%hP9=:x  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) ~Cc%!4f'  
   End If ko<u0SjF)u  
   'ff_angle = nn
uq?((  
   ff_angle = nn * 180 / 3.14159265258979 #gn{X!;-;  
End Function

'判断点在区域内函数 vge4&H3a&  
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 [0c7fH`8V  
Dim aob, boc, cod, doa, sum As Single QFekj@  
  If ppx = p1x And ppy = p1y Then
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     point_in = True g Va;!  
     Exit Function 3DjlX*  
  End If ByyvRc,v  
  If ppx = p2x And ppy = p2y Then efzS]1Jpz  
     point_in = True )M3}6^s]  
     Exit Function
hA=.${uIO  
  End If ;ctPe[5  
   If ppx = p3x And ppy = p3y Then 7`xeuK  
     point_in = True WAq)1gwN  
     Exit Function Nm{|  
  End If B:mtl?69g  
     F:$*0!  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) !
O)je>A  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) <TN+-)H6  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) EBQ,Ypv  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) \B/!}Tn;  
    sum = aob + boc + cod + doa 0G; b+  
    If 360.01 > sum And sum > 359.99 Then !2=m |,  
       point_in = True OQnb^fabY  
    Else =;L44.,g  
       point_in = False B`<a~V  
    End If 
ATRB9  
End Function

'得到点半径,得到交点坐标函数 z(!K8 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() Mq~g+` '  
    '求得中心点坐标 `8 Ann~Z|k  
Dim tt As String tD^$
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Dim rt(3) As Single \+Nn>wW.  
    '判断是否平行 Kcu*Z  
   acx = p3x - p1x )U|0vr8:  
   acy = p3y - p1y U{,:-R  
   bdx = p4x - p2x 1[] 9EJ  
   bdy = p4y - p2y W?H-Ng3E  
   If acx * bdy = acy * bdx Then 9P1!<6mN\  
      rt(0) = 0 `G'Z,P-a  
      Exit Function Mni@@W  
   Else >PS`;S!(  
      '判断斜率存在否 2F&VG|"  
      If p1x = p3x And p2x <> p4x Then <dWms`QcO  
         tt = "ac_n_bd_y" -|DBO0q  
      ElseIf p1x <> p3x And p2x = p4x Then [gaB}aLn  
         tt = "ac_y_bd_n" P=<>H9p:o  
      ElseIf p1x <> p3x And p2x <> p4x Then ()MUyW"S#`  
         tt = "ac_y_bd_y" 0/5{v6_rG  
      End If b3.}m[]  
    Select Case tt xL
ShMv}  
         Case "ac_n_bd_y" `E2RW{$A  
            'bd线段方程 7`J= PG$A  
            k_bd = bdy / bdx ){<qp  
            b_bd = p2y - k_bd * p2x aY8QYK ;?^  
            p_x = p1x
b"JX6efnN  
            p_y = k_bd * p_x + b_bd \o}=ob  
         Case "ac_y_bd_n" ,p' ;Xg6ez  
            'ac线段方程 _T.T[%-&=  
            k_ac = acy / acx "1wjh=@z  
            b_ac = p1y - k_ac * p1x ?
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            p_x = p2x 3f-J%!aH  
            p_y = k_ac * p_x + b_ac i%GNmD  
        Case "ac_y_bd_y" 6f*Q
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           'ac，bd线段都要求 nV/;yl4e{  
           k_ac = acy / acx *v#Z/RrrA  
           b_ac = p1y - k_ac * p1x +JejnG0  
           k_bd = bdy / bdx BHf7\+Ul  
           b_bd = p2y - k_bd * p2x \R[f< K%  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) "Z]z9(  
           p_y = k_ac * p_x + b_ac bLSUF`-z  
        End Select ~.$ca.Gf  
      rt(1) = p_x G-[.BWQ   
      rt(2) = p_y ja&S^B^@  
     z3p TdUt  
'计算最大半径 lo
bC G  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) MLvd6tIv,  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) [_-[S  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) $O^"OQ_@  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 5 \iX%w@  
Dim bb(5) As Single ,lFhLj7  
  bb(1) = rr1 "ph[)/u;  
  bb(2) = rr2 FT6~\9m(  
  bb(3) = rr3 L2IY$+=M  
  bb(4) = rr4 x31Jl{x8\?  
  nb = rr1 }u.I%{4  
For i = 1 To 4 aL|a2+P[`q  
    If nb <= bb(i) Then m](q,65 2  
       nb = bb(i) | Zj=E$  
    End If =`g@6S  
Next i Zvkb=  
    rt(0) = Sqr(nb) =gAn;~  
    rr = rt() 4W<8u(  
  End If ,In}be$:  
         Ey&gZ$|&  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  A;
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8m  

:NXM.@jJ="  
有热压工艺方面的人才或者资料分享下； uolEX+  
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 fu{.Ir  

高手真多！

楼主威武霸气.