[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： (rkg0  
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图片:2.jpg

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关键点说几个： d*0RBgn  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） MK=oGzK  
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 .qO4ceW2-~  
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 cR/Nl pX  

以下是几个重要的函数： <\~v$
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1.判断点在区域中函数 o$sD9x
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2.计算夹角函数 [-])$~WfW  
3.转置函数 6]?mjG6  
4.得到区域中心点，及区域半径函数 ]?tRO  
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） 6dRhK+|  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 V`^*Z}d9  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single e= IdqkJ%  
   cax = x2 - x1 {EoYU\x  
   cay = y2 - y1 /iU<\+ H  
   cbx = x2 - x3 MA`nFkVK  
   cby = y2 - y3 .\R9tt}  
   mo_jj = cax * cbx + cay * cby !p&<.H_  
   mo_ca = Sqr(cax * cax + cay * cay) |nefg0`rk  
   mo_cb = Sqr(cbx * cbx + cby * cby) i1vz{Tc  
   cos_acb = mo_jj / (mo_ca * mo_cb) WHdMP  
   'ff_cos = cos_acb EZ)b E9  
   If cos_acb >= 1 Then ,|A^ <R`  
   nn = 0 Z<nNk.G  
   ElseIf cos_acb <= -1 Then J:@gmo`M;V  
   nn = 3.14159265258979 ^wIB;!W  
   Else <=M5)#  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 8;@y\0  
   End If =!'9TS  
   'ff_angle = nn 3ZXAAV  
   ff_angle = nn * 180 / 3.14159265258979 $hhXsu=  
End Function

'判断点在区域内函数 xMjhC;i{  
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 TKB8%/_p  
Dim aob, boc, cod, doa, sum As Single D$}hoM1  
  If ppx = p1x And ppy = p1y Then vB7Gx>BQd  
     point_in = True /vSGmW-*  
     Exit Function #X-C~*|>j  
  End If I3Vu/&8f|  
  If ppx = p2x And ppy = p2y Then !Cr3>tA  
     point_in = True :uCwWv  
     Exit Function N~!, S;w  
  End If W.j^L;  
   If ppx = p3x And ppy = p3y Then h4`8C]  
     point_in = True vbid>$%  
     Exit Function cW%)C.M  
  End If HMd?`  
     )\1>)BJq  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) Y_%:%J  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) L`nW&;w'  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) !n-Sh<8  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) |vs5N2_  
    sum = aob + boc + cod + doa _.s,gX  
    If 360.01 > sum And sum > 359.99 Then
AG,><UP  
       point_in = True o +$v0vg%T  
    Else ,JwX*L<:  
       point_in = False BN9e S   
    End If T?1BcY  
End Function

'得到点半径,得到交点坐标函数 rUKg<]&@  
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() .n7@$kq  
    '求得中心点坐标 T1Py6Q,-  
Dim tt As String 9nAP%MA`  
Dim rt(3) As Single X_78;T)uA  
    '判断是否平行 IHEbT   
   acx = p3x - p1x EXSJ@k6=8s  
   acy = p3y - p1y ]aPf-O*  
   bdx = p4x - p2x 0qN`-0Yk  
   bdy = p4y - p2y O\<zQ2m  
   If acx * bdy = acy * bdx Then y(|#!m?@  
      rt(0) = 0 l= {Y[T&  
      Exit Function 9QU\J0c/  
   Else Au2?f~#Fv  
      '判断斜率存在否 m7k }k)  
      If p1x = p3x And p2x <> p4x Then DdR0u0JH0  
         tt = "ac_n_bd_y" `4K|L6  
      ElseIf p1x <> p3x And p2x = p4x Then ,V1"Typ#<  
         tt = "ac_y_bd_n" kZ5#a)U<  
      ElseIf p1x <> p3x And p2x <> p4x Then $#rkvG_w  
         tt = "ac_y_bd_y" w+6P x#  
      End If )WoH>D  
    Select Case tt 
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         Case "ac_n_bd_y" UNDl&C2vz  
            'bd线段方程 rO#w(]   
            k_bd = bdy / bdx {Zc8,jm  
            b_bd = p2y - k_bd * p2x y]Nk^ga:U6  
            p_x = p1x JMB#KzvN[  
            p_y = k_bd * p_x + b_bd y`oj\  
         Case "ac_y_bd_n"  bUcp8
 
            'ac线段方程 T`e`nQ0nn  
            k_ac = acy / acx RI*n]HNgy+  
            b_ac = p1y - k_ac * p1x 6/<Hx@r (  
            p_x = p2x LzL)qdL  
            p_y = k_ac * p_x + b_ac ChK-L6  
        Case "ac_y_bd_y"
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           'ac，bd线段都要求 i bzY&f  
           k_ac = acy / acx qWH
^/o  
           b_ac = p1y - k_ac * p1x :E-$:\V0}k  
           k_bd = bdy / bdx M0$MK>  
           b_bd = p2y - k_bd * p2x a]p9[Nk  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) BWxfY^,'&6  
           p_y = k_ac * p_x + b_ac ~u%$ 9IhM  
        End Select azZtuDfv  
      rt(1) = p_x 6:(s8e  
      rt(2) = p_y 1Le8W)J  
     kl]
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'计算最大半径 e%e.|+  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) c!E{fSP  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) ~Eg]Auk7  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) bse`Xfg  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) T^4 dHG-(  
Dim bb(5) As Single dU9;sx  
  bb(1) = rr1 S$
{%T$>  
  bb(2) = rr2 ;i[JCNiS\  
  bb(3) = rr3 f"Iui  
  bb(4) = rr4 ^`!+7!  
  nb = rr1 XncX2E4E  
For i = 1 To 4 AO8 #l YP?  
    If nb <= bb(i) Then :;_}Gxx  
       nb = bb(i) z-MQGqxR  
    End If H5 z1_O_+  
Next i BI%^7\HZ  
    rt(0) = Sqr(nb) (2eS:1+'8  
    rr = rt() ,marNG  
  End If ,< g%
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         E2M<I;:EA  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  Y=|p}>.}  

U"/T`f'H z  
有热压工艺方面的人才或者资料分享下； g%T
okl  
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 Mi#i 3y(  

高手真多！

楼主威武霸气.