[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\~l!f'z  
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关键点说几个： CK Mv7  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） Mz}i[|U\  
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 *2#FRA#q  
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 ^y
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以下是几个重要的函数： @LHtt/&  
1.判断点在区域中函数 j aD!  
2.计算夹角函数 sM0c#YK?  
3.转置函数 h^v9|~ZJ'7  
4.得到区域中心点，及区域半径函数 -g<cinNSp  
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-v~o/r7  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 $xQ"PJ2  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single |O%:P}6c  
   cax = x2 - x1 "zXGp7Q'#  
   cay = y2 - y1 B6(h7~0(<  
   cbx = x2 - x3 nxD'r  
   cby = y2 - y3 w
d"TM  
   mo_jj = cax * cbx + cay * cby Mo~ki"9.  
   mo_ca = Sqr(cax * cax + cay * cay) BZ2nDW*%  
   mo_cb = Sqr(cbx * cbx + cby * cby) CN-4-  
   cos_acb = mo_jj / (mo_ca * mo_cb) $e>/?Ss  
   'ff_cos = cos_acb |}%(6<  
   If cos_acb >= 1 Then Euqjxz  
   nn = 0 #i@ACAgn;6  
   ElseIf cos_acb <= -1 Then yW[L,N7d  
   nn = 3.14159265258979 KxGKA  
   Else )K8P+zn~  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) P4i3y{
$V  
   End If TLXhE(o|o  
   'ff_angle = nn l&vm[3  
   ff_angle = nn * 180 / 3.14159265258979 (/('nY  
End Function

'判断点在区域内函数 !T)T_P[  
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 f<'n5}{RO0  
Dim aob, boc, cod, doa, sum As Single j l}!T[5  
  If ppx = p1x And ppy = p1y Then ?e"Wu+q~L  
     point_in = True B{[f}h.n  
     Exit Function >0kmRVd  
  End If (s5<  
  If ppx = p2x And ppy = p2y Then (zjz]@qJ  
     point_in = True F\o;t:  
     Exit Function XulaPq  
  End If @TdQZZ}G\x  
   If ppx = p3x And ppy = p3y Then BhOXXa{B  
     point_in = True R5m`;hF  
     Exit Function )>-77\  
  End If x-w`KFS  
     R.91v4J  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) JZWgr&O<  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) MFf05\aDu  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) hO5K
\QnRL  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) i7i|370  
    sum = aob + boc + cod + doa Uc_'3|
e  
    If 360.01 > sum And sum > 359.99 Then \Oi5=,  
       point_in = True XRClBTKF  
    Else UOn!Y@  
       point_in = False yjGGqz$  
    End If b*btkaVue  
End Function

'得到点半径,得到交点坐标函数
${jA+L<J  
Function rr(p1x As Single, p1y As Single, p2x As Single, p2y As Single, p3x As Single, p3y As Single, p4x As Single, p4y As Single) As Single() B, QC-Tn  
    '求得中心点坐标 v< 65(I>  
Dim tt As String LFk5rv'sM0  
Dim rt(3) As Single 4]Un=?)I  
    '判断是否平行 `ENlV9  
   acx = p3x - p1x 2(+RIu0d  
   acy = p3y - p1y _7-"VoX  
   bdx = p4x - p2x O\|C,Epm  
   bdy = p4y - p2y N+Q(V*:3v  
   If acx * bdy = acy * bdx Then \SYPu,ZT  
      rt(0) = 0 Q\&AlV  
      Exit Function r~S!<9f  
   Else b5iIV1g  
      '判断斜率存在否 4@/q_*3o  
      If p1x = p3x And p2x <> p4x Then [(D}%+2   
         tt = "ac_n_bd_y" ;']vY  
      ElseIf p1x <> p3x And p2x = p4x Then sf.E|]isW  
         tt = "ac_y_bd_n" H]%mP|  
      ElseIf p1x <> p3x And p2x <> p4x Then iFAoAw(  
         tt = "ac_y_bd_y" }vXA`)Ns  
      End If "'Q"(S  
    Select Case tt H$k![K6Uj  
         Case "ac_n_bd_y" C$N4  
            'bd线段方程 (&9DB  
            k_bd = bdy / bdx k#8S`W8^  
            b_bd = p2y - k_bd * p2x oiTMP`Y  
            p_x = p1x ?`vM#)  
            p_y = k_bd * p_x + b_bd Q9Y9{T  
         Case "ac_y_bd_n" `@u+u0  
            'ac线段方程 /{eih]`x(  
            k_ac = acy / acx Z-? Iip{  
            b_ac = p1y - k_ac * p1x "6`)vgI~  
            p_x = p2x .d#G]8suF  
            p_y = k_ac * p_x + b_ac C }h<ldlY  
        Case "ac_y_bd_y" [I+)Ak5  
           'ac，bd线段都要求 *sc0,'0  
           k_ac = acy / acx 4%',scn  
           b_ac = p1y - k_ac * p1x o+if%3  
           k_bd = bdy / bdx ,p[\fT($]  
           b_bd = p2y - k_bd * p2x !T#8N7J
>  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) 9sfB+]}h  
           p_y = k_ac * p_x + b_ac '-nuH;r  
        End Select giPhW>  
      rt(1) = p_x 4'}_qAT  
      rt(2) = p_y S5*~r@8h  
     Z?.p%*>`T=  
'计算最大半径 brYYuN|Vc  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) x8SM,2ud  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) wB1|r{  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) }C`}wS3i  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) v2Qc}o  
Dim bb(5) As Single ReHd~G9  
  bb(1) = rr1 v)C:E9!|  
  bb(2) = rr2 RF,=bOr19  
  bb(3) = rr3 RAv RNd  
  bb(4) = rr4 Ul$
X%  
  nb = rr1 lt2Nwt0bv  
For i = 1 To 4 G+ $)W u  
    If nb <= bb(i) Then !"Oj$c -  
       nb = bb(i) 5ykk11!p$  
    End If gT5Ji~xI  
Next i !5E%W[  
    rt(0) = Sqr(nb) SSL%$:l@  
    rr = rt() HYI1 o/}  
  End If Zs3]|bUR
 
         MoKXl?B<  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  milK3+N  

CIik@O*  
有热压工艺方面的人才或者资料分享下； tSXjp  
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 f s"V'E2a  

高手真多！

楼主威武霸气.