[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： b6UpE`\z  
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图片:2.jpg

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关键点说几个： 1) Nj.#)  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 1ne
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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 8/k"A-m  
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
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以下是几个重要的函数： yoH,4,!G  
1.判断点在区域中函数 e'MW"uCP}  
2.计算夹角函数 /2'l=R5#  
3.转置函数 *yv@B!r  
4.得到区域中心点，及区域半径函数 66-tNy  
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） ?I$-im  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 O-huC:zZh  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single [ ebk u_  
   cax = x2 - x1 msY6zJc`  
   cay = y2 - y1 5>lIrBf
 
   cbx = x2 - x3 h5(OjlMC  
   cby = y2 - y3 bct8~dY  
   mo_jj = cax * cbx + cay * cby v[r8-0c  
   mo_ca = Sqr(cax * cax + cay * cay) 7"F29\  
   mo_cb = Sqr(cbx * cbx + cby * cby) THARr#1b};  
   cos_acb = mo_jj / (mo_ca * mo_cb) [+_>g4M~%  
   'ff_cos = cos_acb "n_X4e+18P  
   If cos_acb >= 1 Then u 7:Iv  
   nn = 0 >g m  
   ElseIf cos_acb <= -1 Then G\o9mEzQ  
   nn = 3.14159265258979 TbaZFLr  
   Else d8iq9AP\o  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 53 -Owjpx  
   End If |Sm/s;&c6  
   'ff_angle = nn qtmKX  
   ff_angle = nn * 180 / 3.14159265258979 9w~SzpJ%  
End Function

'判断点在区域内函数 U E$Ix  
Function point_in(p1x As Single, p1y As Single, p2x As Single, p2y As Single, p3x As Single, p3y As Single, p4x As Single, p4y As Single, ppx As Single, ppy As Single) As Boolean ~>HzAo9e  
Dim aob, boc, cod, doa, sum As Single 0)M8Tm0$  
  If ppx = p1x And ppy = p1y Then s<rV1D  
     point_in = True TkJ[N4'0  
     Exit Function #?V rt,n  
  End If [h8s0  
  If ppx = p2x And ppy = p2y Then `<7!Rh,tS^  
     point_in = True #qh ,  
     Exit Function aZ+><1TD  
  End If :m(DRD  
   If ppx = p3x And ppy = p3y Then Mc<u?H  
     point_in = True i")0 3b  
     Exit Function mBE&>}G<  
  End If 0{g*\W*+~  
     Bp3E)l  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) &!OEd]  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) DzQ  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) DY9]$h*y  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) ]8}51y8  
    sum = aob + boc + cod + doa  ?C#E_  
    If 360.01 > sum And sum > 359.99 Then N0.|Mb"?t  
       point_in = True DU0/if9.  
    Else Pc_aEBq  
       point_in = False tAF?.\x"g  
    End If nYFrp)DLK  
End Function

'得到点半径,得到交点坐标函数 W3:Fw6v  
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;;^u  
    '求得中心点坐标 qD4]7"9  
Dim tt As String 8 {
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Dim rt(3) As Single ca{MJz
'  
    '判断是否平行 ;~EQS.Qp  
   acx = p3x - p1x NS~;{d\  
   acy = p3y - p1y I5_HaC>  
   bdx = p4x - p2x y=Kqv^  
   bdy = p4y - p2y kIVQ2hmv  
   If acx * bdy = acy * bdx Then P"8Ix  
      rt(0) = 0 8o$rF7.-  
      Exit Function !Aw^X} C  
   Else mK[Z#obc=  
      '判断斜率存在否 ?: yz/9(  
      If p1x = p3x And p2x <> p4x Then %bAQ>E2;m  
         tt = "ac_n_bd_y" h6Z:+  
      ElseIf p1x <> p3x And p2x = p4x Then A~2)ZdAN  
         tt = "ac_y_bd_n" W<r<K=`5P  
      ElseIf p1x <> p3x And p2x <> p4x Then Zd6ik&S   
         tt = "ac_y_bd_y" ;:fW]5"R  
      End If wSN9`"  
    Select Case tt x9vSekV  
         Case "ac_n_bd_y" @PEFl"  
            'bd线段方程 c3^!S0U  
            k_bd = bdy / bdx @ph!3<(In,  
            b_bd = p2y - k_bd * p2x dRX~eIw  
            p_x = p1x LE\=Y;%  
            p_y = k_bd * p_x + b_bd Uj):}xgi'  
         Case "ac_y_bd_n" P.'.KZJ:WD  
            'ac线段方程 STp9Gh-  
            k_ac = acy / acx V4n~Z+k  
            b_ac = p1y - k_ac * p1x C9!t&<\}  
            p_x = p2x m&:&z7^p  
            p_y = k_ac * p_x + b_ac L"qJZU  
        Case "ac_y_bd_y" 1f`De`zXzr  
           'ac，bd线段都要求 Y~WdN<g  
           k_ac = acy / acx 5#,H&ui\  
           b_ac = p1y - k_ac * p1x qq/>E*~  
           k_bd = bdy / bdx s-$Wc)l  
           b_bd = p2y - k_bd * p2x H<(F$7Q!\  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) 6ZqU:^3  
           p_y = k_ac * p_x + b_ac {^WK#$]  
        End Select fF(2bVKP:  
      rt(1) = p_x &-3e3)  
      rt(2) = p_y X
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     )G/bP!^+(  
'计算最大半径 &h-_|N  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) R2,9%!iiX  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y)  g2vm]j  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) <]qNjsdb9"  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) um.ZAS_kmc  
Dim bb(5) As Single QK]P=pE'C  
  bb(1) = rr1 {821e&r  
  bb(2) = rr2 --K)7  
  bb(3) = rr3 ?v
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  bb(4) = rr4 %Mda<3P  
  nb = rr1 ';tlV u  
For i = 1 To 4 ?UtKu  
    If nb <= bb(i) Then Qr.{_M  
       nb = bb(i) 79T_9}M  
    End If 1l,fK)z  
Next i x?Abk  
    rt(0) = Sqr(nb) GV0\+A"vD  
    rr = rt() O[ma% E*0  
  End If 5pCicwea#  
         uY]';OtG  
End Function

高手啊.人才啊.

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

W(62.3d~}?  
有热压工艺方面的人才或者资料分享下； Csu9u'.V  
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 EuHQp7  

高手真多！

楼主威武霸气.