[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： bXk(wXX  
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关键点说几个： Bk[C=<
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1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 6ZfL-E{  
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 HI7w@V
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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 LGK@taw^  

以下是几个重要的函数： %SuELm  
1.判断点在区域中函数  1D_&n@  
2.计算夹角函数 `x_}mdR  
3.转置函数 Ft38)T"2R\  
4.得到区域中心点，及区域半径函数 [:uHe#L  
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） e;g7Ek3n  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 @T:J<,  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single @yo6w}3+-  
   cax = x2 - x1 iI`
vu  
   cay = y2 - y1 U!NuiKaQ26  
   cbx = x2 - x3 e9HL)=YP  
   cby = y2 - y3 Q6D>(H#"0  
   mo_jj = cax * cbx + cay * cby R:$E'PSx  
   mo_ca = Sqr(cax * cax + cay * cay) +3J<vM}dy  
   mo_cb = Sqr(cbx * cbx + cby * cby) tDRo)z  
   cos_acb = mo_jj / (mo_ca * mo_cb) 9!FU,4 X
 
   'ff_cos = cos_acb drc-5{M  
   If cos_acb >= 1 Then (Gw*xsn1  
   nn = 0 YC')vv3o(  
   ElseIf cos_acb <= -1 Then $v #  
   nn = 3.14159265258979 ~_Fx2T:X  
   Else JsNj!aeU%  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) } C:i0Q  
   End If Il Qk W<  
   'ff_angle = nn zjh:jrv~  
   ff_angle = nn * 180 / 3.14159265258979 [NAfy~X*  
End Function

'判断点在区域内函数 G;flj}z  
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 }8" |q3k  
Dim aob, boc, cod, doa, sum As Single l _%<U  
  If ppx = p1x And ppy = p1y Then ?&-1(&  
     point_in = True Jx~H4y=z  
     Exit Function 8toOdh  
  End If &3Yj2
Fw  
  If ppx = p2x And ppy = p2y Then l cHf\~  
     point_in = True C\;l)h_{  
     Exit Function h x&"fe  
  End If 8QK8q:|  
   If ppx = p3x And ppy = p3y Then nq HpYb6I0  
     point_in = True YI ?P@y  
     Exit Function |Z94@uB  
  End If "gJ.mhHX  
     8-NycG&)  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) hPSMPbI  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) IHdA2d?.]  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) n
AWb9Yk  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) (;;ji!i  
    sum = aob + boc + cod + doa i
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    If 360.01 > sum And sum > 359.99 Then {'tfU  
       point_in = True [U/h'A.j  
    Else P%lD9<jED  
       point_in = False E`I(x&_  
    End If aqN{@|  
End Function

'得到点半径,得到交点坐标函数 cJaA*sg  
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() H" `'d  
    '求得中心点坐标 U
%s@np  
Dim tt As String )
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Dim rt(3) As Single A6]X aF  
    '判断是否平行 G|KA!q
 
   acx = p3x - p1x i,r:R g~  
   acy = p3y - p1y ` = O  
   bdx = p4x - p2x =yZq]g6Q  
   bdy = p4y - p2y Bh2l3J4X  
   If acx * bdy = acy * bdx Then rhbz|Uq  
      rt(0) = 0 iW(LD1~7  
      Exit Function ah:["< z<  
   Else kEnGr6e  
      '判断斜率存在否 dEtjcId  
      If p1x = p3x And p2x <> p4x Then H?];8wq$G  
         tt = "ac_n_bd_y" jeWv~JA%L|  
      ElseIf p1x <> p3x And p2x = p4x Then (T#$0
RFq  
         tt = "ac_y_bd_n" 63Zu5b"O/  
      ElseIf p1x <> p3x And p2x <> p4x Then 0fXMY-$I  
         tt = "ac_y_bd_y" iVn4eLK^v  
      End If *
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    Select Case tt XqmB%g(  
         Case "ac_n_bd_y" 'JMW.;Lh?X  
            'bd线段方程 g=$U&Hgs  
            k_bd = bdy / bdx g77M5(ME  
            b_bd = p2y - k_bd * p2x 6/S.sj~  
            p_x = p1x N9_* {HOy  
            p_y = k_bd * p_x + b_bd j+gx
n_E  
         Case "ac_y_bd_n" oL@-<;zKO  
            'ac线段方程 vd[7Pxe  
            k_ac = acy / acx 9KU&M"Yq&i  
            b_ac = p1y - k_ac * p1x !6'N-b1  
            p_x = p2x tJ6@Ot  
            p_y = k_ac * p_x + b_ac H

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        Case "ac_y_bd_y"
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           'ac，bd线段都要求 /%& d:  
           k_ac = acy / acx !l0]IX` F  
           b_ac = p1y - k_ac * p1x Y 3ApW vS  
           k_bd = bdy / bdx *yRsFC{,  
           b_bd = p2y - k_bd * p2x [ @eA o>  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) g4h{dFb|_  
           p_y = k_ac * p_x + b_ac i7.8H*z'  
        End Select ":udoVS!  
      rt(1) = p_x :>fT=$i@  
      rt(2) = p_y ;bB#Pg  
     9O3#d  
'计算最大半径 o4kLgY !Q  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) =Pl@+RgK+  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) tr<fii3<  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) k)n b<JW|r  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) v]V N'Hs?  
Dim bb(5) As Single BI`)P+K2  
  bb(1) = rr1 $CEdJ+0z  
  bb(2) = rr2 bXnUz?1!d  
  bb(3) = rr3 \s*M5oN]]  
  bb(4) = rr4 /9R0}4i7  
  nb = rr1 fIoc)T  
For i = 1 To 4 $K^l=X  
    If nb <= bb(i) Then }pMVl  
       nb = bb(i) Dds-;9  
    End If ^y/Es2A#t  
Next i %1Q:{m  
    rt(0) = Sqr(nb) h~k<"  
    rr = rt() ,>-D xS  
  End If AabQ)23R2  
         4?+K `  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  '[WL8,.Q  

vxmX5.  
有热压工艺方面的人才或者资料分享下； MZV$YD^S  
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 e\V -L_  

高手真多！

楼主威武霸气.