[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： fcF|m5  
R"O%##Ws  

描述:请输入描述

图片:2.jpg

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关键点说几个： }[PwA[k'  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 8w[O%  
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 ETL7|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 L{>rN`{  

以下是几个重要的函数： jmq^98jB  
1.判断点在区域中函数 }15&<s  
2.计算夹角函数 Y_y!$jd(N  
3.转置函数 By7lSbj  
4.得到区域中心点，及区域半径函数 (NR( )2  
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） *.wj3'wV  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 ;5\'PrE  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single Nes|4Z<  
   cax = x2 - x1 y
nMYf  
   cay = y2 - y1 PuZzl%i P3  
   cbx = x2 - x3 JleClB(2n/  
   cby = y2 - y3 o?M;f\Fy  
   mo_jj = cax * cbx + cay * cby #X*);cn  
   mo_ca = Sqr(cax * cax + cay * cay) Gy["_;+xU  
   mo_cb = Sqr(cbx * cbx + cby * cby) ^2rj);{V  
   cos_acb = mo_jj / (mo_ca * mo_cb) 8irTGA  
   'ff_cos = cos_acb bg0ix"  
   If cos_acb >= 1 Then .tfal9  
   nn = 0 p(GI0
2|n  
   ElseIf cos_acb <= -1 Then X~o;jJC  
   nn = 3.14159265258979 b9?Vpu`?  
   Else 8kU(>' ^_:  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) =(TMcu$4`  
   End If s@%>  
   'ff_angle = nn `]GL3cIh:  
   ff_angle = nn * 180 / 3.14159265258979 7W4m&+  
End Function

'判断点在区域内函数 5'{QMnfB  
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 $1s>efP-  
Dim aob, boc, cod, doa, sum As Single ~n
0Exw(  
  If ppx = p1x And ppy = p1y Then :si&A;k  
     point_in = True 8VG~n?y  
     Exit Function `]19}GK~xo  
  End If "#8^":,4  
  If ppx = p2x And ppy = p2y Then 8?<J,zu@AV  
     point_in = True ]1GyEr:  
     Exit Function 69ycP(  
  End If ^a3 (QKS  
   If ppx = p3x And ppy = p3y Then }NV<k
 
     point_in = True Ax@
7RJ||  
     Exit Function 4C:dkaDq]  
  End If /s(PFN8#Y  
     5?(dI9A"K  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) # E8?2]  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) U~7{q >  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) EXW?)_pg  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 6y`FW[  
    sum = aob + boc + cod + doa 6b`
Jq>v  
    If 360.01 > sum And sum > 359.99 Then >U4bK^/Bp  
       point_in = True #sv}%oV,F  
    Else ?6N
\AM'  
       point_in = False =/ !A  
    End If j[$+DCO#|m  
End Function

'得到点半径,得到交点坐标函数 >: @\SU  
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() !HXsxNe  
    '求得中心点坐标 mkBQTQGT  
Dim tt As String ~7\`qH  
Dim rt(3) As Single lY|]  
    '判断是否平行 &s\,+d0  
   acx = p3x - p1x t[b(erO'  
   acy = p3y - p1y rX`fjS*C  
   bdx = p4x - p2x ^:O*Sx.CA  
   bdy = p4y - p2y J04R,B  
   If acx * bdy = acy * bdx Then geqx":gpx9  
      rt(0) = 0 $'a]lR  
      Exit Function `"iPJw14  
   Else dftX$TS  
      '判断斜率存在否 1o   
      If p1x = p3x And p2x <> p4x Then D2:ShyYAS  
         tt = "ac_n_bd_y" 0R&7vn  
      ElseIf p1x <> p3x And p2x = p4x Then OXoEA a  
         tt = "ac_y_bd_n" 4 T/ ~erc  
      ElseIf p1x <> p3x And p2x <> p4x Then *Hh*!ePp  
         tt = "ac_y_bd_y" aJ]t1  
      End If r9-)+R J  
    Select Case tt diw5h};W  
         Case "ac_n_bd_y" xkaed  
            'bd线段方程 .e S* F  
            k_bd = bdy / bdx ,fm{ krE  
            b_bd = p2y - k_bd * p2x `-rtU  
            p_x = p1x n2(\pQKm  
            p_y = k_bd * p_x + b_bd k@9q5lu;T  
         Case "ac_y_bd_n" MY&?*pV)  
            'ac线段方程 LyNur8 Zi  
            k_ac = acy / acx `3UvKqe  
            b_ac = p1y - k_ac * p1x &v r0{]V^  
            p_x = p2x \5) ZI'q  
            p_y = k_ac * p_x + b_ac ia-&?  
        Case "ac_y_bd_y" 34vH+,!u  
           'ac，bd线段都要求 Oo%%f+  
           k_ac = acy / acx YE@!`!`d:  
           b_ac = p1y - k_ac * p1x @Z
~0!VY  
           k_bd = bdy / bdx ^DR`!.ttr  
           b_bd = p2y - k_bd * p2x /Dk`?  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) QVR-`d/  
           p_y = k_ac * p_x + b_ac O<0-`=W,a  
        End Select TrHUM4  
      rt(1) = p_x K5d>{c  
      rt(2) = p_y ^`(3X  
     ^F/H?V/PX  
'计算最大半径 `+WQ^dP@  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) Jz_`dLL^w  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) m] IN-'  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) YW-Ge  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) YccD^w[`B  
Dim bb(5) As Single C5#$NV99p  
  bb(1) = rr1 }Ot2; T  
  bb(2) = rr2 \,b_8^  
  bb(3) = rr3 a^9}ceu?   
  bb(4) = rr4 RXbZaje$  
  nb = rr1 }9&~+Q2  
For i = 1 To 4 _5768G`P  
    If nb <= bb(i) Then X]%n#\t,]  
       nb = bb(i) 2`h  
    End If HBgt!D0MZ  
Next i ^(yU)k3pu  
    rt(0) = Sqr(nb) sX
=_|<[  
    rr = rt() S 5nri(m  
  End If y8O<_VOO}"  
         "V7&@3  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  `Al( AT(p  

.A`Q!  
有热压工艺方面的人才或者资料分享下； %;|^*?!J0  
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 jNa'l<dn]  

高手真多！

楼主威武霸气.