[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： ej=}OH4  
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图片:2.jpg

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关键点说几个： K 6,c||#<  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 8p1:dTI5Pb  
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 :R$v7{1  
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 WE-+WC!!:  

以下是几个重要的函数： GpR,n2  
1.判断点在区域中函数 yWr&G@>G  
2.计算夹角函数 {e0aH `me  
3.转置函数 pF}E`U=Z  
4.得到区域中心点，及区域半径函数 %0 U@k!lP  
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） H;Gs0Qi;  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 Z1(!syg  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single \D#+0  
   cax = x2 - x1 yC!>7@m  
   cay = y2 - y1 2{g&9  
   cbx = x2 - x3 ICTjUQP  
   cby = y2 - y3 H3Zt3l1u+  
   mo_jj = cax * cbx + cay * cby ,.Lo)[(  
   mo_ca = Sqr(cax * cax + cay * cay) 4(,X.GVY/  
   mo_cb = Sqr(cbx * cbx + cby * cby) ";n%^I}  
   cos_acb = mo_jj / (mo_ca * mo_cb) 8|\xU9VT  
   'ff_cos = cos_acb =H}}dC<)  
   If cos_acb >= 1 Then a
@?ebCE  
   nn = 0 e >7Ka\  
   ElseIf cos_acb <= -1 Then 0-d&R@lX.  
   nn = 3.14159265258979 nGTqW/k[+s  
   Else gDH|I;!  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) '6T *b  
   End If -W|~YK7e  
   'ff_angle = nn zThut!O  
   ff_angle = nn * 180 / 3.14159265258979 .Lm`v0'w  
End Function

'判断点在区域内函数 pT;xoe   
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 h?GE-F  
Dim aob, boc, cod, doa, sum As Single X: Be'  
  If ppx = p1x And ppy = p1y Then L|A1bxt  
     point_in = True 3b<;y%  
     Exit Function ^4{{ +G)j  
  End If 6(q8y(.`  
  If ppx = p2x And ppy = p2y Then !B#tJD  
     point_in = True >R\!Qk  
     Exit Function X(C=O?A  
  End If C{V,=Fo^  
   If ppx = p3x And ppy = p3y Then l!}7GWj  
     point_in = True 8: VRq  
     Exit Function n."XiXsN  
  End If }jNVR#D:  
     m
DA1$fj"  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) GGGz7_s ?  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) ]TsmWob  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) ^3Z~RK\}  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) e&9v`8}   
    sum = aob + boc + cod + doa 1EliR uJ  
    If 360.01 > sum And sum > 359.99 Then qqu]r  
       point_in = True )fc+B
_  
    Else IXR%IggJA  
       point_in = False `Z (`  
    End If  t&
G #%  
End Function

'得到点半径,得到交点坐标函数
-.UUa  
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() 8oP"?ew#  
    '求得中心点坐标 S$nEflcz  
Dim tt As String m=MM  
Dim rt(3) As Single f5#VU7=1F2  
    '判断是否平行 &3YXDNm  
   acx = p3x - p1x ET~^P  
   acy = p3y - p1y EB5^eNdL  
   bdx = p4x - p2x 12bztlv  
   bdy = p4y - p2y .wcKG9u  
   If acx * bdy = acy * bdx Then ezr'"1Ba}  
      rt(0) = 0 6W N(Tw  
      Exit Function p@+D$  
   Else y~rtYI  
      '判断斜率存在否 V}q=!zz  
      If p1x = p3x And p2x <> p4x Then = /=?l  
         tt = "ac_n_bd_y" U~<~>^[  
      ElseIf p1x <> p3x And p2x = p4x Then >]?!9@#IH  
         tt = "ac_y_bd_n" OJ)XJL  
      ElseIf p1x <> p3x And p2x <> p4x Then x
)e(g}n  
         tt = "ac_y_bd_y" /#e-x|L  
      End If !l1jQq_mK  
    Select Case tt OH vV_  
         Case "ac_n_bd_y" h%U,g 9_  
            'bd线段方程 e|.a%,Dcy  
            k_bd = bdy / bdx zR }vw{  
            b_bd = p2y - k_bd * p2x /Au7X'}  
            p_x = p1x
?4lEHef  
            p_y = k_bd * p_x + b_bd `FIS2sl/  
         Case "ac_y_bd_n" K%NgZ(x(  
            'ac线段方程 IlMst16q5  
            k_ac = acy / acx A
{\!nq_~N  
            b_ac = p1y - k_ac * p1x O29GPs  
            p_x = p2x c4FU@^Vv  
            p_y = k_ac * p_x + b_ac r%` |kN  
        Case "ac_y_bd_y" cu"ge]},  
           'ac，bd线段都要求 Ly`FU)  
           k_ac = acy / acx  =E:a\r  
           b_ac = p1y - k_ac * p1x 3aEO9v,n  
           k_bd = bdy / bdx a O(&<  
           b_bd = p2y - k_bd * p2x L7$1rO<  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) )|L#i2?:  
           p_y = k_ac * p_x + b_ac d{RMX<;G  
        End Select !R1OSVFp  
      rt(1) = p_x v^1n.l %E  
      rt(2) = p_y %CG=mTP  
     `:EU
~4s\  
'计算最大半径 E3h-?ugO'  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y)
B7nm7[V  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) G'6f6i|<I@  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) =}YaV@g<f  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) t3;QF  
Dim bb(5) As Single ,\0>d}eh!  
  bb(1) = rr1 (:ij'Zbz  
  bb(2) = rr2 $3{I'r]  
  bb(3) = rr3 #^bn~  
  bb(4) = rr4 ^97\TmzP{  
  nb = rr1 -v?)E S  
For i = 1 To 4 8jfEvwY  
    If nb <= bb(i) Then {#}?-X  
       nb = bb(i) MGSD;Lgn  
    End If &%`0&y  
Next i !i?aRI/6  
    rt(0) = Sqr(nb) S *K0OUq  
    rr = rt() aUEnQ%YU"  
  End If !_j6\r=  
         >d5L4&r  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  SH#!Y  

P~7p~ke  
有热压工艺方面的人才或者资料分享下； rEG!A87Zz  
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 =E4~/F}9/T  

高手真多！

楼主威武霸气.