[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： =P^wh  
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关键点说几个： LSd*|3E}n  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） O/OiQ^T  
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 yA7)Y})>  
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 <GIwRVCU  

以下是几个重要的函数： d*]Ew=^L  
1.判断点在区域中函数 mLwY]2T"  
2.计算夹角函数 d'HOpJE  
3.转置函数 $k2)8#\  
4.得到区域中心点，及区域半径函数 ps1@d[
n  
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） ,4@|1z{bfm  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 }GZbo kWg.  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single :pC;`iQ  
   cax = x2 - x1 kDsIp=  
   cay = y2 - y1 h/ep`-YaH  
   cbx = x2 - x3 .YcN S%  
   cby = y2 - y3 M'5'O;kn  
   mo_jj = cax * cbx + cay * cby l},NcPL`  
   mo_ca = Sqr(cax * cax + cay * cay) <$Yi]ty  
   mo_cb = Sqr(cbx * cbx + cby * cby) 9y]J/1#  
   cos_acb = mo_jj / (mo_ca * mo_cb) %
%}A|,  
   'ff_cos = cos_acb ,E*R,'w   
   If cos_acb >= 1 Then IB$7`7  
   nn = 0 (Wj2?k/]  
   ElseIf cos_acb <= -1 Then 9K"JYJ q2  
   nn = 3.14159265258979 n9UKcN-  
   Else u?
0d[mC  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 80hme+e  
   End If <@#PF$!  
   'ff_angle = nn z'MS#6|}  
   ff_angle = nn * 180 / 3.14159265258979 Oh!(@  
End Function

'判断点在区域内函数 46XN3r  
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 $kz!zjC'  
Dim aob, boc, cod, doa, sum As Single <
y=ovkM3  
  If ppx = p1x And ppy = p1y Then tYe:z:7l?<  
     point_in = True U}AX0*S  
     Exit Function 0i@:KYP  
  End If RQ' H!(K  
  If ppx = p2x And ppy = p2y Then ?pwE
0N^  
     point_in = True `E>vG-9  
     Exit Function <^><3U`  
  End If .[j%sGdKl  
   If ppx = p3x And ppy = p3y Then bhg}-dto  
     point_in = True b1^cD6sT+  
     Exit Function |4>:M\h  
  End If 8T5k-HwE  
     e!0OW7kV  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) w~@[r4W  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) &8?`<   
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) G$=-,6kZO  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) i0Pn Z J  
    sum = aob + boc + cod + doa Mg? L-C  
    If 360.01 > sum And sum > 359.99 Then aiux^V  
       point_in = True Sb"2Im>  
    Else L.)yXuo4  
       point_in = False x)viY5vjH  
    End If =ApY9`  
End Function

'得到点半径,得到交点坐标函数 9g@NcJ]  
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() )f*Iomp]@  
    '求得中心点坐标 uiMIz?+  
Dim tt As String WU\m^!`w=F  
Dim rt(3) As Single #7W.s!#}Dd  
    '判断是否平行 -9&g[  
   acx = p3x - p1x pVG>A&4  
   acy = p3y - p1y p24.bLr  
   bdx = p4x - p2x H1T~u{8j}  
   bdy = p4y - p2y Pj!%ym3A  
   If acx * bdy = acy * bdx Then hyu}}0:  
      rt(0) = 0 n;OHH{E{  
      Exit Function fPz=KoN  
   Else |- OHve4A  
      '判断斜率存在否 !: |nI77|  
      If p1x = p3x And p2x <> p4x Then AbY;H  
         tt = "ac_n_bd_y" !-(J-45  
      ElseIf p1x <> p3x And p2x = p4x Then ^5x4q  
         tt = "ac_y_bd_n" JQT4N[rEE  
      ElseIf p1x <> p3x And p2x <> p4x Then l1RlYl5  
         tt = "ac_y_bd_y" 0/Q5d,'Y[2  
      End If wAz,vq=x  
    Select Case tt `A{'s %$?!  
         Case "ac_n_bd_y" Z;J`5=TS  
            'bd线段方程 viV-e$s`.  
            k_bd = bdy / bdx 3- )kwy6L  
            b_bd = p2y - k_bd * p2x { _X#f
q0}  
            p_x = p1x sT1jF3  
            p_y = k_bd * p_x + b_bd <2)v9c  
         Case "ac_y_bd_n" e7|d=W  
            'ac线段方程 5f3!NeI  
            k_ac = acy / acx ?h&l tD  
            b_ac = p1y - k_ac * p1x ~UW{)]_jox  
            p_x = p2x Tw}z7U"  
            p_y = k_ac * p_x + b_ac .~,^u  
        Case "ac_y_bd_y" g& >mP?  
           'ac，bd线段都要求 Gf
NWP  
           k_ac = acy / acx )$F6  
           b_ac = p1y - k_ac * p1x SyB-iQ
n  
           k_bd = bdy / bdx n}5x-SxS0  
           b_bd = p2y - k_bd * p2x buc*rtHfA  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) 9/H^t*
5t  
           p_y = k_ac * p_x + b_ac dw99FA6  
        End Select LOt#1Qv  
      rt(1) = p_x 6\mC$:F  
      rt(2) = p_y f>4+,@G  
     %Fm`Y.l
 
'计算最大半径 hhj ,rcsi  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) )SD_}BY%k  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) 8fEAY
RGd  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) W7]mfy^  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) dcR6KG8  
Dim bb(5) As Single bY&YSlO  
  bb(1) = rr1 Qv=Bq{N  
  bb(2) = rr2 b@F_7P%  
  bb(3) = rr3 $"(3MnR  
  bb(4) = rr4 o"f%\N0_8  
  nb = rr1 EK.c+Or,  
For i = 1 To 4 a6 *Y%?  
    If nb <= bb(i) Then 5I_hh?N4Z  
       nb = bb(i)  nFVbQa~  
    End If .Btv}b  
Next i ^ M8k  
    rt(0) = Sqr(nb) @Zh8 QI+  
    rr = rt() Q.uR<C6)v  
  End If Ic_tc  
         Q!Msy<v  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  bdNY7|j`  

znGZULa#  
有热压工艺方面的人才或者资料分享下； z+5u/t  
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 ,3g]=f  

高手真多！

楼主威武霸气.