[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： jg~_'4f#  
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关键点说几个： Oz:D.V 3~  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） BRe{1i 6  
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 F vj{@B!  
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 O'fk&&l  

以下是几个重要的函数： Te+^J8  
1.判断点在区域中函数 K${}r0   
2.计算夹角函数 JfkTw~'R  
3.转置函数 =:4?>2)  
4.得到区域中心点，及区域半径函数 Khj=llo,  
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） 3)y{n%
3L  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 +lKrj\Xj  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single X($6IL6m  
   cax = x2 - x1 ;,dkJ7M  
   cay = y2 - y1 M\dO({o  
   cbx = x2 - x3 b~j~  
   cby = y2 - y3 l&3ki!  
   mo_jj = cax * cbx + cay * cby dhW<p5  
   mo_ca = Sqr(cax * cax + cay * cay) -1CEr_(P^  
   mo_cb = Sqr(cbx * cbx + cby * cby) *="m3:c'J  
   cos_acb = mo_jj / (mo_ca * mo_cb) @89I#t6A.  
   'ff_cos = cos_acb {
S*!B  
   If cos_acb >= 1 Then izf~w^/  
   nn = 0 -AC`q/bCD  
   ElseIf cos_acb <= -1 Then a1|c2kT  
   nn = 3.14159265258979 UQ~4c,  
   Else 7b46t2W<  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) b_l3+'#ofM  
   End If ]H+{eJB7O  
   'ff_angle = nn 5z~\5x  
   ff_angle = nn * 180 / 3.14159265258979 Px#$uU  
End Function

'判断点在区域内函数 Qci$YTwl>  
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 13a(FG  
Dim aob, boc, cod, doa, sum As Single VgMP^&/gZ  
  If ppx = p1x And ppy = p1y Then q{E"pyt36R  
     point_in = True PrSkHxm  
     Exit Function 4P%m>[  
  End If xnbsg!`;7W  
  If ppx = p2x And ppy = p2y Then @rwU 1T33  
     point_in = True DjwQ`MA  
     Exit Function {6O0.}q]&  
  End If !)c=1EX]"  
   If ppx = p3x And ppy = p3y Then }lP5GT2  
     point_in = True Obo_YE  
     Exit Function ErDL^M-`  
  End If XV=S)  
     O R #7"  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) (ua q<Cvg  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) hH`Jb77L  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) k|FSz#Y  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 62kb2C  
    sum = aob + boc + cod + doa {155b0  
    If 360.01 > sum And sum > 359.99 Then eg3L:rk_  
       point_in = True WeC(w+}p  
    Else \zu}\{  
       point_in = False iYKU[UP?  
    End If p)3nyN=|_  
End Function

'得到点半径,得到交点坐标函数 %0XvJF)s  
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() /IR#A%U  
    '求得中心点坐标 6GINmkA  
Dim tt As String `,Orf ZMb  
Dim rt(3) As Single .Yx_:h=u  
    '判断是否平行 kNPDm6m  
   acx = p3x - p1x S~3\3qt$  
   acy = p3y - p1y ]sj0~DI*m  
   bdx = p4x - p2x V1<`%=%
_W  
   bdy = p4y - p2y X:=c5*0e  
   If acx * bdy = acy * bdx Then BQjGv?p0s  
      rt(0) = 0 9.&mz}q
 
      Exit Function 6G_<2bO  
   Else 2z\;Q8g){r  
      '判断斜率存在否 G
7-!`-Nk  
      If p1x = p3x And p2x <> p4x Then ?)i1b\4Go  
         tt = "ac_n_bd_y" iiNSDc  
      ElseIf p1x <> p3x And p2x = p4x Then Eg8i _s~:  
         tt = "ac_y_bd_n" \##5O7/1  
      ElseIf p1x <> p3x And p2x <> p4x Then eVt1d2.O  
         tt = "ac_y_bd_y" !wh&>3~  
      End If 5=Lq=,K$  
    Select Case tt q;A;H)?g  
         Case "ac_n_bd_y" V'StvU  
            'bd线段方程 _x %1F  
            k_bd = bdy / bdx ]b}B2F'n  
            b_bd = p2y - k_bd * p2x 4|Ui?.4=  
            p_x = p1x 8;n_TMb  
            p_y = k_bd * p_x + b_bd 7SS07$B  
         Case "ac_y_bd_n" *H2]H@QHN  
            'ac线段方程 Q"VMNvKYB  
            k_ac = acy / acx 3M<!?%v\A  
            b_ac = p1y - k_ac * p1x W3JF5*  
            p_x = p2x h-mTj3p-K  
            p_y = k_ac * p_x + b_ac &Lt@} 7$8  
        Case "ac_y_bd_y" \:&@;!a  
           'ac，bd线段都要求 l\Xd.H" j,  
           k_ac = acy / acx J(iV0LAZb  
           b_ac = p1y - k_ac * p1x g7V_[R(6  
           k_bd = bdy / bdx p;%<mUI  
           b_bd = p2y - k_bd * p2x 6 hiC?2b{x  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) {a"RXa  
           p_y = k_ac * p_x + b_ac |_zO_Frtp  
        End Select ;BBpN`T  
      rt(1) = p_x @8gEH+r  
      rt(2) = p_y ^:cRp9l"7  
     }5bM1h#z  
'计算最大半径 |~e?,[-2`r  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) w~+aW(2  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) OJ,m1{9$}  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) t9u|iTY f!  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 8MF2K6  
Dim bb(5) As Single -s"0/)HD  
  bb(1) = rr1 ?<~WO?  
  bb(2) = rr2 b^Cfhy^RTq  
  bb(3) = rr3 n1J]p#nCa.  
  bb(4) = rr4 2`Gv5}LfyR  
  nb = rr1 NFyMY#\]  
For i = 1 To 4 !OE*z $\  
    If nb <= bb(i) Then 
V4K'R2t  
       nb = bb(i) $>w/
Cy  
    End If Y&f\VNlT  
Next i HL8eD^  
    rt(0) = Sqr(nb) >.DC!QV  
    rr = rt() .v])S}K  
  End If 4hAJ!7[A.  
         S; /. %
 
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  *dsX#Iz  

"&o,yd%  
有热压工艺方面的人才或者资料分享下； ~}ovuf=%  
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 uh3)0.nR  

高手真多！

楼主威武霸气.