[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： >9<YQ(  
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图片:2.jpg

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关键点说几个： |J$Bj?  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） w_#C8}2  
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 oc;4;A-;`c  
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 LjCUkbzQF  

以下是几个重要的函数： VUC_|=?dL  
1.判断点在区域中函数 X 4\V4_  
2.计算夹角函数 -J>f,zA  
3.转置函数 P"+R:O\!g  
4.得到区域中心点，及区域半径函数 o:`^1  
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） pgPm0+N  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 q"Sja!-;|  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single :-$TD('F  
   cax = x2 - x1 .Hg{$SAC(w  
   cay = y2 - y1 G"ixw  
   cbx = x2 - x3 b^A7R{G7  
   cby = y2 - y3 n.Y45(@E  
   mo_jj = cax * cbx + cay * cby ^UBzX;|p  
   mo_ca = Sqr(cax * cax + cay * cay) EAHdt=8W{  
   mo_cb = Sqr(cbx * cbx + cby * cby) ,(f({l[J}  
   cos_acb = mo_jj / (mo_ca * mo_cb) ' pIC~  
   'ff_cos = cos_acb .  LeS-  
   If cos_acb >= 1 Then ? M.'YB2  
   nn = 0 h-fm)1S_  
   ElseIf cos_acb <= -1 Then 9{0%M  
   nn = 3.14159265258979 xeKm} MN]S  
   Else vhzz(UPUt  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) $."Fz x  
   End If <) -]'@*c  
   'ff_angle = nn AoY!f'Z  
   ff_angle = nn * 180 / 3.14159265258979 !&5|:96o  
End Function

'判断点在区域内函数 N*\ri0  
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 JW"`i   
Dim aob, boc, cod, doa, sum As Single Q_dMuoI  
  If ppx = p1x And ppy = p1y Then i-.AD4  
     point_in = True R G~GVf  
     Exit Function Hs6Kki1  
  End If g ;XK3R  
  If ppx = p2x And ppy = p2y Then ?)Je%H  
     point_in = True +pQ3bX  
     Exit Function eI%kxqc  
  End If S;oRE'kk  
   If ppx = p3x And ppy = p3y Then |io)?`pj  
     point_in = True 4UND;I&  
     Exit Function O\6gw$  
  End If 7Hj7b:3K&!  
     40z1Qkmaey  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) C=2DxdZG  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) G-,0mo  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) ]@~%i=.7  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) \7IT[<Se  
    sum = aob + boc + cod + doa . g- HB'  
    If 360.01 > sum And sum > 359.99 Then @LSX@V   
       point_in = True [.6bxK  
    Else AUES;2WL  
       point_in = False wFjQ1
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    End If =5:S"WNj  
End Function

'得到点半径,得到交点坐标函数 m"6K_4r]  
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() 1&vR7z]*  
    '求得中心点坐标
mx#)iHY  
Dim tt As String j?g#8L;W\w  
Dim rt(3) As Single 1QnaZhu'  
    '判断是否平行 Zv*uUe  
   acx = p3x - p1x [Dmf.PUe  
   acy = p3y - p1y >/NegJh'F}  
   bdx = p4x - p2x vZs~=nfi#|  
   bdy = p4y - p2y e E(+  
   If acx * bdy = acy * bdx Then o 9(x\g  
      rt(0) = 0 *SlWA)9Y  
      Exit Function =k;X}/  
   Else zMM~4?4  
      '判断斜率存在否 Mm1
>g~o  
      If p1x = p3x And p2x <> p4x Then c#>:U,j
 
         tt = "ac_n_bd_y" i6y=3k  
      ElseIf p1x <> p3x And p2x = p4x Then fI'+4 )@x  
         tt = "ac_y_bd_n" XqwP<5Z  
      ElseIf p1x <> p3x And p2x <> p4x Then  *I}_g4  
         tt = "ac_y_bd_y" k_?~@G[I  
      End If E*kZGHA  
    Select Case tt ?6L8#"=  
         Case "ac_n_bd_y" O1+yOef"k  
            'bd线段方程 Xq"Es  
            k_bd = bdy / bdx [57`V&c5  
            b_bd = p2y - k_bd * p2x P"Z1K5>2L  
            p_x = p1x ePxAZg$ `>  
            p_y = k_bd * p_x + b_bd }o\} qu*  
         Case "ac_y_bd_n" N9M",(WTt}  
            'ac线段方程 rFUd  
            k_ac = acy / acx zAev@+.ld  
            b_ac = p1y - k_ac * p1x 4Lz[bI  
            p_x = p2x ~=<uYv?0s  
            p_y = k_ac * p_x + b_ac AJ3Byb=.  
        Case "ac_y_bd_y" Og?GYe^_  
           'ac，bd线段都要求 Y{Lxo])e  
           k_ac = acy / acx @\>7 wt_'  
           b_ac = p1y - k_ac * p1x Bgp%hK  
           k_bd = bdy / bdx I|;C}lfp  
           b_bd = p2y - k_bd * p2x `.]oH1\  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) c0w1 N]+Ne  
           p_y = k_ac * p_x + b_ac IGab~`c-[  
        End Select
#\O'*mz  
      rt(1) = p_x !1A< jL  
      rt(2) = p_y {~G~=sC$  
     =Lnip<t>ja  
'计算最大半径 "v0SvV<7  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y)  ':DL  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) D
btkWq%  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) Eb CK9  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 2Uu!_n}tNF  
Dim bb(5) As Single :@@m'zF<;  
  bb(1) = rr1 mX?t|:[b  
  bb(2) = rr2 <'BsQHI  
  bb(3) = rr3 ?ef7%0  
  bb(4) = rr4 &l4kwds R  
  nb = rr1 Vock19P  
For i = 1 To 4 }r;=<mc,O  
    If nb <= bb(i) Then %c%`<y<~L  
       nb = bb(i) K$r)^K=s  
    End If tZFpxyF  
Next i e-1G\}E  
    rt(0) = Sqr(nb) fvV"H{V,  
    rr = rt() %|>D{q6C  
  End If m'k>U4  
         z\?<j%e!t  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  jpoNTl'  

i'^! SEt  
有热压工艺方面的人才或者资料分享下； .3cD.']%  
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 AR&l9R[{N  

高手真多！

楼主威武霸气.