[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： @*!8  
NKh8'=S  

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图片:2.jpg

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关键点说几个： @LqLtr@A  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） !-)Hog5\  
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 >Ta|#]{  
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 $QN}2lJ>  

以下是几个重要的函数： `2
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1.判断点在区域中函数 2M1}`H\  
2.计算夹角函数 GAI(=  
3.转置函数 f_I6g uDPz  
4.得到区域中心点，及区域半径函数 jv_z%
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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） Xt& rYv  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 3V2dN)\  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single R+}7]tva6C  
   cax = x2 - x1 KsVN<eR{  
   cay = y2 - y1 uI lm!*0  
   cbx = x2 - x3 (]ToBju  
   cby = y2 - y3 T8'm{[C  
   mo_jj = cax * cbx + cay * cby $S Kax#[  
   mo_ca = Sqr(cax * cax + cay * cay) *ETSx{)8  
   mo_cb = Sqr(cbx * cbx + cby * cby) Ww\M3Q`h  
   cos_acb = mo_jj / (mo_ca * mo_cb) ~*NG~Kn"s  
   'ff_cos = cos_acb apy9B6%PJ+  
   If cos_acb >= 1 Then !79eF)  
   nn = 0 +xYU$e6Z  
   ElseIf cos_acb <= -1 Then d%?$
UnQ  
   nn = 3.14159265258979 l|{q8i#4V  
   Else -,YoVB!T  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) ]40@yr
c  
   End If !:BmDX[<n  
   'ff_angle = nn ~[a6  
   ff_angle = nn * 180 / 3.14159265258979 Q>d<4]`  
End Function

'判断点在区域内函数 +%sMd]$,n  
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 Gv\39+9=  
Dim aob, boc, cod, doa, sum As Single Lqa|9|!  
  If ppx = p1x And ppy = p1y Then 
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     point_in = True " i!Xiy~  
     Exit Function 2p|ed=ly%  
  End If +Z7:(o<  
  If ppx = p2x And ppy = p2y Then i U"2uLgb  
     point_in = True e|1.-P@  
     Exit Function "rVf{
  
  End If a'!p^/6?  
   If ppx = p3x And ppy = p3y Then 7ILb&JQ!%{  
     point_in = True u;G-46  
     Exit Function T;C0t9Yew  
  End If (Q(=MEar  
     1
[:tiTG|C  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) `=%mU/v  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) g>*P}r~;^b  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) +?9. &<?  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) O= 84ZP%  
    sum = aob + boc + cod + doa i+@t_pxc  
    If 360.01 > sum And sum > 359.99 Then A<p6]#t#X)  
       point_in = True }}b &IA#  
    Else Um%$TGw5  
       point_in = False Eg+z(m$M  
    End If HRg< f= oz  
End Function

'得到点半径,得到交点坐标函数 W[B;;"ro  
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() -izZ D  
    '求得中心点坐标 *pSD[E>SU  
Dim tt As String *
\#?)q  
Dim rt(3) As Single M _e^KF  
    '判断是否平行 D` abVf  
   acx = p3x - p1x !SAR/sdXf  
   acy = p3y - p1y gJY
X  
   bdx = p4x - p2x Jty/gjK+  
   bdy = p4y - p2y  %Z-B{I(  
   If acx * bdy = acy * bdx Then ~]78R!HJ  
      rt(0) = 0 9jf2b  
      Exit Function
~8tb^  
   Else 9B
9:lR  
      '判断斜率存在否 chszP{-@X  
      If p1x = p3x And p2x <> p4x Then mw flx8  
         tt = "ac_n_bd_y" 4fL/,j/^  
      ElseIf p1x <> p3x And p2x = p4x Then + 0 |d2_]E  
         tt = "ac_y_bd_n" ay>u``$R  
      ElseIf p1x <> p3x And p2x <> p4x Then {w52]5l  
         tt = "ac_y_bd_y" L4!T  
      End If NsF8`rg  
    Select Case tt $E6bu4I  
         Case "ac_n_bd_y" JXAH/N&i  
            'bd线段方程 b |JM4jgK  
            k_bd = bdy / bdx Uu(FFd~3  
            b_bd = p2y - k_bd * p2x Rd:wMy$  
            p_x = p1x dU.H9\p  
            p_y = k_bd * p_x + b_bd g1(`a`M  
         Case "ac_y_bd_n" K!qV82b='{  
            'ac线段方程 w;]~2$  
            k_ac = acy / acx M&ec%<lM  
            b_ac = p1y - k_ac * p1x k*k 9hv?  
            p_x = p2x ^k}%k#)  
            p_y = k_ac * p_x + b_ac ]vUTb9>{?  
        Case "ac_y_bd_y" vJfj1 f  
           'ac，bd线段都要求 &? z6f9*$  
           k_ac = acy / acx Y~g*"J5j  
           b_ac = p1y - k_ac * p1x &\ \)x.!  
           k_bd = bdy / bdx VhX~sJ1%Gp  
           b_bd = p2y - k_bd * p2x MB!$s_~o#L  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) woyeKOr  
           p_y = k_ac * p_x + b_ac ZuVes?&j  
        End Select Xw]L'+V=  
      rt(1) = p_x gQlL0jAV  
      rt(2) = p_y =plU3D2  
     I1fUV72  
'计算最大半径 s*UO!bHa  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) !fK9YW(Im  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) 99u9L)  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) +kZW:t!-  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) sY@x(qkIOc  
Dim bb(5) As Single <p\iB'y  
  bb(1) = rr1 ofHe8a8  
  bb(2) = rr2 \Ss6F]K]  
  bb(3) = rr3 rFU|oDF  
  bb(4) = rr4 B,avI&7M;S  
  nb = rr1 Fpckb18}(O  
For i = 1 To 4 ?n9?`8a#  
    If nb <= bb(i) Then ';Ew-u  
       nb = bb(i) Gb_y"rx?0  
    End If g4NbzU[I  
Next i d,*#yzO  
    rt(0) = Sqr(nb) KQ2jeJ/pj  
    rr = rt() Hribk[99  
  End If !R"iV^?V  
         k+`e0Jago  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  ?N/6m  

bJ#]Xm(]D  
有热压工艺方面的人才或者资料分享下； ^qP}/H[QT  
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 H 6~
6hg  

高手真多！

楼主威武霸气.