[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： w}7`Vas9  
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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： SkN^ytKE  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） +)ro EJ_  
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 Ik~5j(^E-  
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 LgB}!OLQ  

以下是几个重要的函数： JQI`9$asuC  
1.判断点在区域中函数 {9Y@?  
2.计算夹角函数 ca$D|3  
3.转置函数 Jg: Uv6eN+  
4.得到区域中心点，及区域半径函数 u!;kBs  
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） &a1ag
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6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 <@e6zQG  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single D3BX[  
   cax = x2 - x1 :|P"`j  
   cay = y2 - y1 hnH:G`[F  
   cbx = x2 - x3 o"TEmZUP  
   cby = y2 - y3 "RZ)pav?  
   mo_jj = cax * cbx + cay * cby l&
5| =  
   mo_ca = Sqr(cax * cax + cay * cay) Mm|HA
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   mo_cb = Sqr(cbx * cbx + cby * cby) oa47TqFt  
   cos_acb = mo_jj / (mo_ca * mo_cb) >0B[  
   'ff_cos = cos_acb dzggl(  
   If cos_acb >= 1 Then @v@'8E Q  
   nn = 0 $ 'HiNP {c  
   ElseIf cos_acb <= -1 Then &)<]AG.vd!  
   nn = 3.14159265258979 S ^2'O7uj  
   Else PDM>6U
 
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) ;/>~|@  
   End If x&8fmUS:@;  
   'ff_angle = nn @
^#y23R U  
   ff_angle = nn * 180 / 3.14159265258979 EtN"K-X  
End Function

'判断点在区域内函数 tE<L4;t  
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 CK'Cf{S  
Dim aob, boc, cod, doa, sum As Single hq(3%- 7&  
  If ppx = p1x And ppy = p1y Then li,kW`j+t  
     point_in = True >/ HC{.k  
     Exit Function L.ndLd  
  End If !(l,+@j  
  If ppx = p2x And ppy = p2y Then 7u o4F=%  
     point_in = True &A=d7ASN=  
     Exit Function _17c}o#`5w  
  End If SJIJV6}H  
   If ppx = p3x And ppy = p3y Then =:o)+N
E  
     point_in = True Qt]nlui~  
     Exit Function ~F uD6f  
  End If # |w,^tV  
     /.7x[Yc  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) [Z~>7ayF+)  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) //K]zu  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) 7A3e-51>  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) =]U[   
    sum = aob + boc + cod + doa +- c#UO
>  
    If 360.01 > sum And sum > 359.99 Then [sACPn$f  
       point_in = True ~'v^__8  
    Else Xqf"Wx(X  
       point_in = False &hjrJ/'^  
    End If 5orA#B  
End Function

'得到点半径,得到交点坐标函数 b>Vs5nY!  
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() %C'!L]#  
    '求得中心点坐标 /rKrnxw  
Dim tt As String tv\P$|LV`8  
Dim rt(3) As Single D#^v=U  
    '判断是否平行 2R:['QT  
   acx = p3x - p1x `'+[Y;s_  
   acy = p3y - p1y f^m8 4o'  
   bdx = p4x - p2x ;l}TUo  
   bdy = p4y - p2y P0}uTee  
   If acx * bdy = acy * bdx Then mbJ#-^}V  
      rt(0) = 0 z}u  
      Exit Function tUz!]P2BUO  
   Else wjKW 3  
      '判断斜率存在否 ?%*Zgk!l7  
      If p1x = p3x And p2x <> p4x Then J=zh+oLCV  
         tt = "ac_n_bd_y" 7&|fD{:4U  
      ElseIf p1x <> p3x And p2x = p4x Then @qg=lt|(F  
         tt = "ac_y_bd_n" &[23DrI8  
      ElseIf p1x <> p3x And p2x <> p4x Then L{<E'#@F  
         tt = "ac_y_bd_y" Ms^,]Q1{  
      End If VGq2ITg9eE  
    Select Case tt vTP'\^;  
         Case "ac_n_bd_y" RHVMlMX  
            'bd线段方程 ]5uCs[  
            k_bd = bdy / bdx \T<?=A  
            b_bd = p2y - k_bd * p2x Wa,[#H  
            p_x = p1x 19;\:tN  
            p_y = k_bd * p_x + b_bd B>|@XfPM  
         Case "ac_y_bd_n" |w:7).P  
            'ac线段方程 `Z/"Dd;F^3  
            k_ac = acy / acx A3M)yWq  
            b_ac = p1y - k_ac * p1x 6ZCt xs!  
            p_x = p2x
HQv#\Xi1  
            p_y = k_ac * p_x + b_ac 2Hy$SSH  
        Case "ac_y_bd_y" H }</a%y  
           'ac，bd线段都要求 -DU[dU*~  
           k_ac = acy / acx j YO#  
           b_ac = p1y - k_ac * p1x M0"xDvQ  
           k_bd = bdy / bdx $p}7CP  
           b_bd = p2y - k_bd * p2x S(9fGh  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) /v=MGX@r  
           p_y = k_ac * p_x + b_ac V4ayewVX  
        End Select } Tp!Ub\Cc  
      rt(1) = p_x (Cqhk:F  
      rt(2) = p_y Q6"r^wWx  
     )P\ec  
'计算最大半径 UT]LF#.(  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) ^EM##Ss_  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) DkQy.  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) sh E>gTe  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) e9N"{kDs6  
Dim bb(5) As Single \BUr2]  
  bb(1) = rr1 vY}/CBmg  
  bb(2) = rr2 ~hYG%  
  bb(3) = rr3 %'k^aqFL  
  bb(4) = rr4 <Cn-MOoM  
  nb = rr1 om;jXf}A  
For i = 1 To 4 hPD2/M  
    If nb <= bb(i) Then RzFv``g  
       nb = bb(i) co@Q   
    End If 'd0]`2tVg4  
Next i mqw&SxU9  
    rt(0) = Sqr(nb) K`PF|=z  
    rr = rt() ?5jkb  
  End If n\wO[l)  
         k+&LOb7  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  CC;T[b&  

t$m268m~  
有热压工艺方面的人才或者资料分享下； t5\~Z}G8  
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 XkDjA#nx`  

高手真多！

楼主威武霸气.