[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： |)_-Bi;MW`  
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描述:请输入描述

图片:2.jpg

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关键点说几个： a}.Y!O&  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） n+2J Dq|?p  
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 |Svk^mq  
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 w!q&  

以下是几个重要的函数： Z^tGu7x  
1.判断点在区域中函数 Qd8b-hg  
2.计算夹角函数 QXk"?yT`E  
3.转置函数 .`LgYW  
4.得到区域中心点，及区域半径函数 C*wdtEGq  
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） 8l 
xY]UT  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 ~ v1W  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single 5 ;vC(Go  
   cax = x2 - x1 29O]S8  
   cay = y2 - y1 ],?pe  
   cbx = x2 - x3 nu 7lh6o=  
   cby = y2 - y3 BRtXf0~&p  
   mo_jj = cax * cbx + cay * cby Kx]> fHK  
   mo_ca = Sqr(cax * cax + cay * cay) dM|g`rr E  
   mo_cb = Sqr(cbx * cbx + cby * cby) :`<psvd  
   cos_acb = mo_jj / (mo_ca * mo_cb) 0(TvQ{  
   'ff_cos = cos_acb Iu6W=A  
   If cos_acb >= 1 Then mmN|F
$;r  
   nn = 0 EX 9Z{xX  
   ElseIf cos_acb <= -1 Then :J%'=_I&H  
   nn = 3.14159265258979 LkaG[^tfN  
   Else ^uBwj}6  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) .;%q/hP  
   End If 8?Wgawx  
   'ff_angle = nn 9}n,@@  
   ff_angle = nn * 180 / 3.14159265258979 {W'8T}q  
End Function

'判断点在区域内函数 "8_,tYAH  
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 `G0*l|m>  
Dim aob, boc, cod, doa, sum As Single KZi'v
6  
  If ppx = p1x And ppy = p1y Then ^teaJy%  
     point_in = True r:#Q9EA  
     Exit Function 3*2I$e!Jt  
  End If x.G"D(  
  If ppx = p2x And ppy = p2y Then 4[_L=zD  
     point_in = True D@5s8xv  
     Exit Function iha9!kf  
  End If 8vO;IK]9b^  
   If ppx = p3x And ppy = p3y Then :Fo4O'UC  
     point_in = True -=>U =|  
     Exit Function Lv3XYZ
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  End If w#
<^RKk  
     n`QO(pZ6+  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 1(#RN9   
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) CnQg*+  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) U%n,XOJ  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) p~FQcW'a~  
    sum = aob + boc + cod + doa 9[,s4sxH  
    If 360.01 > sum And sum > 359.99 Then 9IOGc}  
       point_in = True =1Ri]b  
    Else 1M=   
       point_in = False C;%Y\S  
    End If 1h{>[ 'L  
End Function

'得到点半径,得到交点坐标函数 k*O
vcYL1A  
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() \a?K?v|8  
    '求得中心点坐标 e& p_f<  
Dim tt As String U @)k3^
 
Dim rt(3) As Single <_>.!9q  
    '判断是否平行 au,jAk  
   acx = p3x - p1x p %L1uwLG  
   acy = p3y - p1y .<HC[ls  
   bdx = p4x - p2x #n=A)#'my  
   bdy = p4y - p2y pFEZDf}:  
   If acx * bdy = acy * bdx Then YsZ{1W  
      rt(0) = 0 .uBO  
      Exit Function ](_{,P  
   Else {:,_A  
      '判断斜率存在否 =w?M_[&K)  
      If p1x = p3x And p2x <> p4x Then b~jIv:9T  
         tt = "ac_n_bd_y" :Jjw"}SfK#  
      ElseIf p1x <> p3x And p2x = p4x Then FOc|*>aKP  
         tt = "ac_y_bd_n" %3rTQ:X
 
      ElseIf p1x <> p3x And p2x <> p4x Then GKiq0*/M  
         tt = "ac_y_bd_y" Q js2hj-$  
      End If W=UqX{-j)  
    Select Case tt  oHOW5  
         Case "ac_n_bd_y" B;SzuCW  
            'bd线段方程 H_Iim[v#  
            k_bd = bdy / bdx UlnyTz~  
            b_bd = p2y - k_bd * p2x KUF$
h Er  
            p_x = p1x o>@=N2n  
            p_y = k_bd * p_x + b_bd .\Ul!&y  
         Case "ac_y_bd_n" g})6V  
            'ac线段方程 5/t
j  
            k_ac = acy / acx Ze#Jhn@  
            b_ac = p1y - k_ac * p1x ,.[.SU#V  
            p_x = p2x 4 #aqz9k  
            p_y = k_ac * p_x + b_ac : #3OcD4  
        Case "ac_y_bd_y" -xw98  
           'ac，bd线段都要求 C/CN '  
           k_ac = acy / acx {%=S+89l  
           b_ac = p1y - k_ac * p1x ^eT@!N  
           k_bd = bdy / bdx 'G<}U343=8  
           b_bd = p2y - k_bd * p2x /X@7ju
;  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) ('T4Db  
           p_y = k_ac * p_x + b_ac l8er$8S}  
        End Select (L`l+t1  
      rt(1) = p_x MJ1W*'9</W  
      rt(2) = p_y 5LO4P>f
q  
     cT_uJbP+  
'计算最大半径 $< A8gTJ  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) xR*5q1j  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) {An8/"bv}  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) &1*4%N@'  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 7X(rLd 6#  
Dim bb(5) As Single Rl y jOf{0  
  bb(1) = rr1 )!N2'Ld  
  bb(2) = rr2 y=-{Q  
  bb(3) = rr3 tceIA8d6  
  bb(4) = rr4 BO8%:/37[4  
  nb = rr1 M_qP!+Y  
For i = 1 To 4 =]!8:I?C<  
    If nb <= bb(i) Then xR0~S 3caI  
       nb = bb(i) -"2<h:#  
    End If kSLSxfR  
Next i J f\Qf  
    rt(0) = Sqr(nb) %|#P&`  
    rr = rt() ny278tr Q7  
  End If PZKbnu  
         <dq,y>  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  |-SI(Khjk  

z1}tC\9'%  
有热压工艺方面的人才或者资料分享下； )_x8?:lv  
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 A-AN6.  

高手真多！

楼主威武霸气.