[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： ma1(EJ/  
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关键点说几个： w<Zdq}{jO  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） j,\tejl1  
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 vf6`s\6  
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 DE'Xq6#PK  

以下是几个重要的函数： jMTRcj];(  
1.判断点在区域中函数 +8]W\<Kp  
2.计算夹角函数 )t*S'R  
3.转置函数 G}182"#4  
4.得到区域中心点，及区域半径函数 $[)6H7!U)  
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） ~u};XhZ  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 yb[{aL^4%  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single W,xi>5k  
   cax = x2 - x1 ,.~ W  
   cay = y2 - y1 gmXy>{T  
   cbx = x2 - x3 ue,#,
3{m  
   cby = y2 - y3 ~D<7W4c  
   mo_jj = cax * cbx + cay * cby E~'q?LJOB  
   mo_ca = Sqr(cax * cax + cay * cay) 98X!
uh'  
   mo_cb = Sqr(cbx * cbx + cby * cby) oxUE79  
   cos_acb = mo_jj / (mo_ca * mo_cb) >`<Ued  
   'ff_cos = cos_acb >.a+:   
   If cos_acb >= 1 Then M' &J_g  
   nn = 0 ,O$Z,J4VL  
   ElseIf cos_acb <= -1 Then Is4%}J!8  
   nn = 3.14159265258979 Gtj(  
   Else 83mlZ1jQz  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) Y'tqm&}  
   End If 99\{!W  
   'ff_angle = nn I8%d;G~  
   ff_angle = nn * 180 / 3.14159265258979  Ask' !  
End Function

'判断点在区域内函数 SQ1M4:hP  
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 Mfnlue](  
Dim aob, boc, cod, doa, sum As Single X=rc3~}f  
  If ppx = p1x And ppy = p1y Then -9=M9}eDF  
     point_in = True CBiU#h q  
     Exit Function >wz;}9v  
  End If 08<k'Oi]  
  If ppx = p2x And ppy = p2y Then @5{.K/s  
     point_in = True 4yA9Ni  
     Exit Function 7
Vz[ji  
  End If 08TaFzP81  
   If ppx = p3x And ppy = p3y Then Z7tU0  
     point_in = True Q'n(^tbL  
     Exit Function [VY8?y  
  End If :z0s*,QH  
     71oFm1m{  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) tYI]LL  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) tc+GR?-7W  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) ga4/,   
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) Jngll  
    sum = aob + boc + cod + doa -/(DPx  
    If 360.01 > sum And sum > 359.99 Then 3q~":bpAp  
       point_in = True {-xi0
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    Else #rn4$  
       point_in = False viW~'}^k7  
    End If %NF<bEV  
End Function

'得到点半径,得到交点坐标函数 Wo:zU  
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() "e1{V8 4  
    '求得中心点坐标 |'V<>v.v  
Dim tt As String wQo6!
H"K  
Dim rt(3) As Single -Z`(? k  
    '判断是否平行 E%wV  
   acx = p3x - p1x TIK/%T  
   acy = p3y - p1y 8! |.H p  
   bdx = p4x - p2x _ 6+,R  
   bdy = p4y - p2y "4Vi=*2V  
   If acx * bdy = acy * bdx Then WrE-Zti  
      rt(0) = 0 %5Q
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      Exit Function J)7,&Gc6  
   Else _1w.B8Lyz@  
      '判断斜率存在否 (uuEjM$3%  
      If p1x = p3x And p2x <> p4x Then EuKrYY]g  
         tt = "ac_n_bd_y" 
#hy5c,}>  
      ElseIf p1x <> p3x And p2x = p4x Then TnvHO_P,  
         tt = "ac_y_bd_n" _/QKWk&j  
      ElseIf p1x <> p3x And p2x <> p4x Then ?MV[=LPL  
         tt = "ac_y_bd_y" ^F0k2
pB  
      End If 'NQMZfz  
    Select Case tt fd!pM4"0  
         Case "ac_n_bd_y" `@fhge  
            'bd线段方程 bl:a&<F  
            k_bd = bdy / bdx C|.$L<`  
            b_bd = p2y - k_bd * p2x OEy:#9<'  
            p_x = p1x 7`uA  
            p_y = k_bd * p_x + b_bd 2-"Lxe65f  
         Case "ac_y_bd_n" #K<=xP  
            'ac线段方程 h8iaJqqvJ  
            k_ac = acy / acx C;58z5*,  
            b_ac = p1y - k_ac * p1x i#@v_^q  
            p_x = p2x %9~kA5Qj  
            p_y = k_ac * p_x + b_ac }2iKi(io*  
        Case "ac_y_bd_y" >0g`U  
           'ac，bd线段都要求 PK.h E{R  
           k_ac = acy / acx (x1"uy7_  
           b_ac = p1y - k_ac * p1x 3&a*]
  
           k_bd = bdy / bdx zCj*:n  
           b_bd = p2y - k_bd * p2x 9:CVN@E  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) @,yFY  
           p_y = k_ac * p_x + b_ac eu}:Wg2  
        End Select T(sG.%  
      rt(1) = p_x ?FY@fO?es  
      rt(2) = p_y 26('V `N  
     $.r}g\43P  
'计算最大半径 q^jq
LT&w  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 32iWYN  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) xvdnEaWe$  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) By"^ Z`EP4  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) z/P^-N>  
Dim bb(5) As Single ' F 6au[  
  bb(1) = rr1 $dVgFot  
  bb(2) = rr2 NSiYUAug  
  bb(3) = rr3  eo<~1w  
  bb(4) = rr4 vZ_DG}n11  
  nb = rr1 *mK);@pL  
For i = 1 To 4 5JU(@}Db  
    If nb <= bb(i) Then R uFu,H-  
       nb = bb(i) %Zl_{Q]h  
    End If st'?3A  
Next i 654jS!  
    rt(0) = Sqr(nb) e%@[d<Ta\  
    rr = rt() eHnei F  
  End If =B o4yN  
         QX.F1T2e?  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  wM&x8 <  

me`$5Z`
 
有热压工艺方面的人才或者资料分享下； Y 
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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
"m;(T{ v  

高手真多！

楼主威武霸气.