[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： e+j)~RBnu3  
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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： RiTa \  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） <N`J`J-[  
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 Ht-t1q  
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 :mS# h@l  

以下是几个重要的函数： UDc$"a}ds{  
1.判断点在区域中函数 Hi yc#-4  
2.计算夹角函数 "&/]@)TPz  
3.转置函数 )m&U#S _;  
4.得到区域中心点，及区域半径函数 eVR5Xar  
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） X<MO7I  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 ]u-02g  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single
/q@s  
   cax = x2 - x1 97,rE$bC  
   cay = y2 - y1 Xwa_3Xm*Le  
   cbx = x2 - x3 ZO7&vF}  
   cby = y2 - y3 ]=EM@  
   mo_jj = cax * cbx + cay * cby X]y)ZF26  
   mo_ca = Sqr(cax * cax + cay * cay) 9ktEm|F3  
   mo_cb = Sqr(cbx * cbx + cby * cby) gUR]{dq^'  
   cos_acb = mo_jj / (mo_ca * mo_cb) jhGlG-^  
   'ff_cos = cos_acb

Gs*G<P"  
   If cos_acb >= 1 Then E"|4Y(G  
   nn = 0 id?#TqD  
   ElseIf cos_acb <= -1 Then FkqQf8HB  
   nn = 3.14159265258979 vMs;>lhtg  
   Else phYDs9-K  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) #u5~0,F  
   End If F=)&98^v$_  
   'ff_angle = nn f7hXQ
|$  
   ff_angle = nn * 180 / 3.14159265258979 3SBZ>  
End Function

'判断点在区域内函数 tVqmn  
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 tJ=di5&  
Dim aob, boc, cod, doa, sum As Single 6<5Jq\-h  
  If ppx = p1x And ppy = p1y Then E4D (,s  
     point_in = True {6d b{ ay_  
     Exit Function 7W9~1 .SC  
  End If ~~8rI[/  
  If ppx = p2x And ppy = p2y Then np WEop>  
     point_in = True eeUp 1g  
     Exit Function s(&;q4|  
  End If )~rB}>^Z  
   If ppx = p3x And ppy = p3y Then `BnP[jF  
     point_in = True cX At:m  
     Exit Function GI
v){[i  
  End If z]Acs  
     &!y]:CC{  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) ^ft]b
2i  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) m
YNEz @  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) -)<mS  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) ,fnsE^}.U  
    sum = aob + boc + cod + doa LQ-6vrbs  
    If 360.01 > sum And sum > 359.99 Then cCxi{a1uo  
       point_in = True
u{bL-a8}  
    Else .dI)R40L/\  
       point_in = False nd+?O7~}(  
    End If Y5-kj,CB  
End Function

'得到点半径,得到交点坐标函数 ;IC'Gq  
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() W3LP ~  
    '求得中心点坐标 bZ#X9fT  
Dim tt As String >IR$e=5$  
Dim rt(3) As Single 
B4O6>'  
    '判断是否平行
2q%K)h  
   acx = p3x - p1x }f}IA\8]  
   acy = p3y - p1y 3#Y3Dz`  
   bdx = p4x - p2x y3yvZD  
   bdy = p4y - p2y 0Ry
Fv+  
   If acx * bdy = acy * bdx Then 
M^ 5e~y  
      rt(0) = 0 ?mOg@) wx  
      Exit Function a{`"68  
   Else +p?hGoF=  
      '判断斜率存在否 S!7g)  
      If p1x = p3x And p2x <> p4x Then w &vhWq  
         tt = "ac_n_bd_y" O|UxFnB}  
      ElseIf p1x <> p3x And p2x = p4x Then IT1PPm  
         tt = "ac_y_bd_n" [A_r1g&_  
      ElseIf p1x <> p3x And p2x <> p4x Then Lht[g9  
         tt = "ac_y_bd_y" 9bEM#Hj  
      End If ,QS'$n  
    Select Case tt \Hs|$   
         Case "ac_n_bd_y" 0 
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            'bd线段方程 \/,g VT  
            k_bd = bdy / bdx Z}[xQ5  
            b_bd = p2y - k_bd * p2x N?+eWY  
            p_x = p1x l
<2oklo5  
            p_y = k_bd * p_x + b_bd g9qC{xd  
         Case "ac_y_bd_n" 8ath45G@  
            'ac线段方程 .&chdVcxyS  
            k_ac = acy / acx 9-G b"hr  
            b_ac = p1y - k_ac * p1x lf8xL9v  
            p_x = p2x hb!
ln7  
            p_y = k_ac * p_x + b_ac Yzd2G,kZ=  
        Case "ac_y_bd_y" ou;qO 5CT  
           'ac，bd线段都要求 cDO:'-  
           k_ac = acy / acx ~@YQ,\Y  
           b_ac = p1y - k_ac * p1x K_##-6>  
           k_bd = bdy / bdx \ 522,n`  
           b_bd = p2y - k_bd * p2x -,/3"}<^78  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) L *{Qj
H  
           p_y = k_ac * p_x + b_ac `r]TA]DR  
        End Select eKJ:?Lxv;  
      rt(1) = p_x fM{1Os  
      rt(2) = p_y _vIO!*h0  
     3"vRK5Bf  
'计算最大半径 ^5>du~d  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) <Cr8V'c  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) j=Q$K#sBt  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) 9ET/I$n  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) fD(7FN8  
Dim bb(5) As Single #|ddyCg2  
  bb(1) = rr1 -? Tz.y&  
  bb(2) = rr2 C1D ! V:  
  bb(3) = rr3 Oh-Fp-v87  
  bb(4) = rr4 e2Ww0IK!E  
  nb = rr1 j Ii[  
For i = 1 To 4 0T1ko,C!,e  
    If nb <= bb(i) Then 0`Gai2\1@  
       nb = bb(i) KJ pj  
    End If &PSTwZd  
Next i [88{@
)  
    rt(0) = Sqr(nb) enPLaiJ'|q  
    rr = rt() ,,}sK  
  End If K{N%kk%F  
         Tr$i= M  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  $Z,i|K;  

'`9%'f)  
有热压工艺方面的人才或者资料分享下； IO^:FnJJv  
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 &t~zD4u B  

高手真多！

楼主威武霸气.