[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： x}`)'a[  
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关键点说几个： Mbly-l{|  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） Y>2#9LA  
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 weGsjy(b]N  
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 #'i,'h+F  

以下是几个重要的函数： zqXDD; w3  
1.判断点在区域中函数 )C0Iy.N-  
2.计算夹角函数 u<Ch]m+  
3.转置函数 'w/S6j  
4.得到区域中心点，及区域半径函数 B1Z;  
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） olHmRJ  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 XZTH[#MqeI  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single s,|v,,<+  
   cax = x2 - x1 >V%.=})K  
   cay = y2 - y1 r. rzU  
   cbx = x2 - x3 +QSH*(,  
   cby = y2 - y3 )2jH&}K  
   mo_jj = cax * cbx + cay * cby fNrpYR X  
   mo_ca = Sqr(cax * cax + cay * cay) gla'urb[i|  
   mo_cb = Sqr(cbx * cbx + cby * cby) ij}{H#0S-  
   cos_acb = mo_jj / (mo_ca * mo_cb) VEL!-e^X&  
   'ff_cos = cos_acb Hr}\-$  
   If cos_acb >= 1 Then 4~vn%O6n  
   nn = 0 je>mAQKi\  
   ElseIf cos_acb <= -1 Then aOUTKyR ~  
   nn = 3.14159265258979 TTo?BVBK  
   Else 9`&sZ|"3  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) Iq{/-,v  
   End If I;{Ua*  
   'ff_angle = nn + =U9<8  
   ff_angle = nn * 180 / 3.14159265258979 M~9IL\J^G  
End Function

'判断点在区域内函数 gU@R   
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 Z3X9-_g  
Dim aob, boc, cod, doa, sum As Single ,K.W
ni#m  
  If ppx = p1x And ppy = p1y Then #1'p?%K.  
     point_in = True &mba{O  
     Exit Function >GDf* ox[  
  End If ~UwqQD1p
 
  If ppx = p2x And ppy = p2y Then T9>,Mx%D[  
     point_in = True )<5hga][~a  
     Exit Function oSO~72  
  End If 8b25D|8l  
   If ppx = p3x And ppy = p3y Then FlbM(ofY  
     point_in = True 0.U- tg0  
     Exit Function $A98h-*x  
  End If 8
(!?y[  
     &i*e&{L7  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) @|d`n\%x  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) kr44@!s+'  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) ]];LA!
n  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) }e>OmfxDBt  
    sum = aob + boc + cod + doa
Jg6@)<n  
    If 360.01 > sum And sum > 359.99 Then ]1q`N7  
       point_in = True Ed#Hilk'  
    Else c
fc=a  
       point_in = False }~v0o# I  
    End If U@LIw6B!KL  
End Function

'得到点半径,得到交点坐标函数 1L4v X  
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() |u[@g`Z  
    '求得中心点坐标 #\6k_toZ  
Dim tt As String 6PMu*-Nv!j  
Dim rt(3) As Single Gr~J-#a3~D  
    '判断是否平行 x!fRT.,}  
   acx = p3x - p1x
u/` t+-A  
   acy = p3y - p1y uAV-wc  
   bdx = p4x - p2x Ro#O{  
   bdy = p4y - p2y p<Vj<6.=?  
   If acx * bdy = acy * bdx Then dF+:9iiAm  
      rt(0) = 0 #ahe@|E'Y  
      Exit Function v2vtkYQN  
   Else /)V8X#,  
      '判断斜率存在否 8HDI]  
      If p1x = p3x And p2x <> p4x Then 6I\4Yv$N  
         tt = "ac_n_bd_y" IG4`f~k^  
      ElseIf p1x <> p3x And p2x = p4x Then xp]_>WGq  
         tt = "ac_y_bd_n" 88zK)k{  
      ElseIf p1x <> p3x And p2x <> p4x Then KWn.  
         tt = "ac_y_bd_y" ;@<e]Ft  
      End If c,5y

H  
    Select Case tt 1sXVuto  
         Case "ac_n_bd_y" lkb,UL;V  
            'bd线段方程 `m-7L  
            k_bd = bdy / bdx |p*s:*TJp  
            b_bd = p2y - k_bd * p2x |N5|B Q(y$  
            p_x = p1x xepp."
O  
            p_y = k_bd * p_x + b_bd Yo,n#<37  
         Case "ac_y_bd_n" I=7 YAm[W  
            'ac线段方程 69zMWuY  
            k_ac = acy / acx gnw?Y 2
 
            b_ac = p1y - k_ac * p1x v.>95|8  
            p_x = p2x (6i.>%|_  
            p_y = k_ac * p_x + b_ac :\|<7n   
        Case "ac_y_bd_y" Q&&oP:4~X*  
           'ac，bd线段都要求 dz)(~@tgz  
           k_ac = acy / acx B{7hRk.5!  
           b_ac = p1y - k_ac * p1x 8LGNV&Edg  
           k_bd = bdy / bdx l'Uj"9r,  
           b_bd = p2y - k_bd * p2x D3C3_ @*  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) !Gh*Vtd8-  
           p_y = k_ac * p_x + b_ac p9~$}!ua  
        End Select gO_d!x*  
      rt(1) = p_x m@g9+7  
      rt(2) = p_y p^ )iC&*0  
     2E@y0[C?  
'计算最大半径 i0&W}Bb'  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) ZP"Xn/L  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) .-cx9&  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) d{(NeTs  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) KKNQ+'?  
Dim bb(5) As Single > |(L3UA9  
  bb(1) = rr1 "?s  
  bb(2) = rr2 7K /quJ  
  bb(3) = rr3 0W]vK$\F*  
  bb(4) = rr4 +
sx$%N  
  nb = rr1 i: VMCNH  
For i = 1 To 4 e9rgJJ  
    If nb <= bb(i) Then A%.ZesjAx  
       nb = bb(i) \y+@mJWa  
    End If J{PNB{v  
Next i a}'dIDj  
    rt(0) = Sqr(nb) }EN-WDJD\  
    rr = rt() WL}XD Kx  
  End If l6pvQ|  
         <4.j]BE  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  +g_m|LF  

.pIO<ZAFT  
有热压工艺方面的人才或者资料分享下； GIhFOK  
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 m|Sf'5fK  

高手真多！

楼主威武霸气.