[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： sHP-@  
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关键点说几个： 5,RUPaE  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 4`IM[DIG~  
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 _]Hna<Ly  
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 lq/2Y4LE)  

以下是几个重要的函数： |D3u"Y!:^  
1.判断点在区域中函数 &J[a.:..  
2.计算夹角函数 weitDr6  
3.转置函数 Nd_fjB  
4.得到区域中心点，及区域半径函数 4JSPD#%f  
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） +Q*`kg'  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 wN2+3LY{  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single ]' mbHkn68  
   cax = x2 - x1 }fpya2Xt  
   cay = y2 - y1 E$d3+``  
   cbx = x2 - x3 R{hX--|j  
   cby = y2 - y3 L\yVE J9x  
   mo_jj = cax * cbx + cay * cby `S&a.k  
   mo_ca = Sqr(cax * cax + cay * cay) l/$GF|`U  
   mo_cb = Sqr(cbx * cbx + cby * cby) z*Sm5i&)_q  
   cos_acb = mo_jj / (mo_ca * mo_cb) gjF5~ `  
   'ff_cos = cos_acb Er~17$b  
   If cos_acb >= 1 Then XGlt^<`  
   nn = 0 eh#37*-  
   ElseIf cos_acb <= -1 Then C3AWXO ^  
   nn = 3.14159265258979 ~PQ.l\C  
   Else |J`EM7qMK  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 
J=V  
   End If lwnO  
   'ff_angle = nn iP/v"g"g  
   ff_angle = nn * 180 / 3.14159265258979 !`ol&QQ#  
End Function

'判断点在区域内函数 vwR_2u  
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 2:+8]b3i  
Dim aob, boc, cod, doa, sum As Single |@ mz@  
  If ppx = p1x And ppy = p1y Then dQut8>0&  
     point_in = True *0WVrM06?  
     Exit Function Z:b?^u4.  
  End If OhF55,[  
  If ppx = p2x And ppy = p2y Then 3CUQQ_  
     point_in = True Z[vx0[av&  
     Exit Function M,G
y.ivz  
  End If gv!8' DKn  
   If ppx = p3x And ppy = p3y Then !}*N';  
     point_in = True 6fwNlC/9  
     Exit Function +a#&W}K  
  End If J?4{#p  
     C|{Sj`,XG  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) Y#U.9>h  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) Q G)s  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) N
#w5}It  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) "tCI_ Zi;  
    sum = aob + boc + cod + doa tZxx#v`  
    If 360.01 > sum And sum > 359.99 Then 5C w( 4.  
       point_in = True U}2@  
    Else RK# 6JfC3X  
       point_in = False !_glZ*t
L  
    End If o$_0Qs$  
End Function

'得到点半径,得到交点坐标函数 UlXm4\@  
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() /E>;O47a  
    '求得中心点坐标 VPN 9 Ql=  
Dim tt As String >}k*!J|  
Dim rt(3) As Single goM;Pf "<  
    '判断是否平行 g&RpE41x  
   acx = p3x - p1x 3j#VKj+Uc  
   acy = p3y - p1y L K&c~ Uy  
   bdx = p4x - p2x b1xE;0uR  
   bdy = p4y - p2y *oO%+6nL  
   If acx * bdy = acy * bdx Then 0'&C5v'  
      rt(0) = 0 ^&3vGu9  
      Exit Function *0U#Z]t  
   Else gx\V)8Zr  
      '判断斜率存在否 }OkzP)(  
      If p1x = p3x And p2x <> p4x Then YznL+TD  
         tt = "ac_n_bd_y" Q`CuZkP(  
      ElseIf p1x <> p3x And p2x = p4x Then Vjs2Yenx  
         tt = "ac_y_bd_n" d`\SX(C  
      ElseIf p1x <> p3x And p2x <> p4x Then u5CSx'h]  
         tt = "ac_y_bd_y" F6{g{ B  
      End If ;NP-tA)  
    Select Case tt <I,4Kc!  
         Case "ac_n_bd_y" f,YORJ  
            'bd线段方程 LP3#f{U  
            k_bd = bdy / bdx
W3i<Unq  
            b_bd = p2y - k_bd * p2x 288mP]a(v_  
            p_x = p1x &Vj@){  
            p_y = k_bd * p_x + b_bd CKw-HgXG  
         Case "ac_y_bd_n" 97c0bgI!+  
            'ac线段方程 qw+7.h#V  
            k_ac = acy / acx l@Lk+-[D  
            b_ac = p1y - k_ac * p1x l,n_G/\  
            p_x = p2x /cS8@)e4  
            p_y = k_ac * p_x + b_ac ]H`wE_2tu  
        Case "ac_y_bd_y" t/i*.>7  
           'ac，bd线段都要求 St;9&A  
           k_ac = acy / acx /
X8a3Eqp9  
           b_ac = p1y - k_ac * p1x 1I;q@g0  
           k_bd = bdy / bdx GzEw~JAs  
           b_bd = p2y - k_bd * p2x AA-$;s  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) 4'faE="1)S  
           p_y = k_ac * p_x + b_ac % :G78.  
        End Select h(WlJCln  
      rt(1) = p_x e`Yj}i*bx]  
      rt(2) = p_y 8YSvBy  
     ^;II@n i  
'计算最大半径 ,|f=2t+5X  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 5a |R  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) k(f),_  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) i7RK*{  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) CI+)0=`<1B  
Dim bb(5) As Single lG6&uMvo  
  bb(1) = rr1 dX\OP>  
  bb(2) = rr2 CXUF=IE  
  bb(3) = rr3 mmQC9nZ  
  bb(4) = rr4 uVYn,DB`  
  nb = rr1 &4E|c[HN
  
For i = 1 To 4 %<~EwnoT  
    If nb <= bb(i) Then u`EK^\R  
       nb = bb(i) a,rXG

 
    End If /@"mQx~[q  
Next i <mX5VGY9^  
    rt(0) = Sqr(nb) hLfWDf*T|  
    rr = rt() r6j[C"@  
  End If >MJ%6A>  
         =Vh]{y~$  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  ?`*`A9@  

/|Gz<nSc  
有热压工艺方面的人才或者资料分享下； Q<osYO{l  
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 }k1[Fc|  

高手真多！

楼主威武霸气.