[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： &O
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关键点说几个： r gi4>  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） L)S V?FBx  
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 K(?p]wh  
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 ,g3n/'rP%  

以下是几个重要的函数： IJ:JH=8  
1.判断点在区域中函数 tWQ$`<h  
2.计算夹角函数 E}#&2n8Y  
3.转置函数 V^>< =DNE  
4.得到区域中心点，及区域半径函数 Q)8I(*  
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） 1CJAFi>%D  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 A^zd:h-  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single qd~9uo&[Ig  
   cax = x2 - x1 Q~rE+?n9F  
   cay = y2 - y1 ?V(+Cc  
   cbx = x2 - x3 8KKhD$  
   cby = y2 - y3 )M"xCO3a  
   mo_jj = cax * cbx + cay * cby !-
&;t7R  
   mo_ca = Sqr(cax * cax + cay * cay) 5{vuN)K3  
   mo_cb = Sqr(cbx * cbx + cby * cby) ^oClf(  
   cos_acb = mo_jj / (mo_ca * mo_cb) P{: 5i%qC  
   'ff_cos = cos_acb %&s4YD/{  
   If cos_acb >= 1 Then &^Gp  
   nn = 0 e+<9Sh7&  
   ElseIf cos_acb <= -1 Then qG]0z_dPE~  
   nn = 3.14159265258979 .*J /F$  
   Else k/BlkjlNE  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) H!l9a  
   End If %u2",eHCB  
   'ff_angle = nn M~+DxnJ=  
   ff_angle = nn * 180 / 3.14159265258979 XK)0Mt\  
End Function

'判断点在区域内函数 iqN?'8  
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 D6C h6i5$  
Dim aob, boc, cod, doa, sum As Single k^zU;  
  If ppx = p1x And ppy = p1y Then s%RG_"l  
     point_in = True Q8.LlE999  
     Exit Function bL+}n8B  
  End If Vjd>j; H  
  If ppx = p2x And ppy = p2y Then da@W6Ovx  
     point_in = True _6g(C_m'T?  
     Exit Function Jje!*?&8X  
  End If %36@1l-N  
   If ppx = p3x And ppy = p3y Then 8xkLfN|N=  
     point_in = True ,lFp4C  
     Exit Function s#(%u t  
  End If T8yMaC  
     !fjB oK+  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 4=N(@mS  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) yM,Y8^  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) jdx T662q  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) Iyb_5 UmpF  
    sum = aob + boc + cod + doa rZE+B25T~  
    If 360.01 > sum And sum > 359.99 Then {kr14l*2  
       point_in = True q1m{G1W n  
    Else S,Tc\}  
       point_in = False Z9Z\2t  
    End If RdNLf  
End Function

'得到点半径,得到交点坐标函数 DgY !)cS  
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() q%dbx:y#  
    '求得中心点坐标 l,zhBnD  
Dim tt As String j0s$}FPUI  
Dim rt(3) As Single vhcp[=e :  
    '判断是否平行 T k@~w  
   acx = p3x - p1x "M3;>"
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   acy = p3y - p1y /'b7q y  
   bdx = p4x - p2x o$rF-?  
   bdy = p4y - p2y  Lw%_xRn)  
   If acx * bdy = acy * bdx Then l@ (:Q!Sk  
      rt(0) = 0 Y*S:/b~y  
      Exit Function 1Kd6tnX  
   Else =itQ@``r  
      '判断斜率存在否 t[@>u'YKt  
      If p1x = p3x And p2x <> p4x Then 5pK _-:?  
         tt = "ac_n_bd_y" n9n)eI)R  
      ElseIf p1x <> p3x And p2x = p4x Then A7|L|+ ?  
         tt = "ac_y_bd_n" z,4 D'F&  
      ElseIf p1x <> p3x And p2x <> p4x Then \ Ce
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h  
         tt = "ac_y_bd_y" `uH7~ r^  
      End If
b&dv("e 4  
    Select Case tt 5$+ssR_?k  
         Case "ac_n_bd_y" |(.%
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            'bd线段方程 ge<D}6GQ  
            k_bd = bdy / bdx <HzL%DX  
            b_bd = p2y - k_bd * p2x (z?j{J  
            p_x = p1x R<(xWH  
            p_y = k_bd * p_x + b_bd _A])q  
         Case "ac_y_bd_n" &/WE{W  
            'ac线段方程 C,GZ  
            k_ac = acy / acx VxuV`Plf  
            b_ac = p1y - k_ac * p1x PB?2{Cj
 
            p_x = p2x Gh@~~\  
            p_y = k_ac * p_x + b_ac ]V_A4Df  
        Case "ac_y_bd_y" -
;J6S  
           'ac，bd线段都要求 Poa&htxe1  
           k_ac = acy / acx `E?0jQ  
           b_ac = p1y - k_ac * p1x M.r7^9P  
           k_bd = bdy / bdx / *PHX@  
           b_bd = p2y - k_bd * p2x zn7)>cQ905  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) 32j}ep.*  
           p_y = k_ac * p_x + b_ac 7 )rL<+  
        End Select 4^M"V5tDx  
      rt(1) = p_x qb/}&J7+  
      rt(2) = p_y H-U_  
     eZN"t~\rX  
'计算最大半径 7GWOJ^)  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 7(N+'8  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) 5j6`W?|q  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) PP>6  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) j49Uj}:j  
Dim bb(5) As Single d7 H*F  
  bb(1) = rr1 R&J?XQ  
  bb(2) = rr2 :dAd5v2f  
  bb(3) = rr3 x3Y)l1gh  
  bb(4) = rr4 ,"XiI$Le  
  nb = rr1 9 fYNSr  
For i = 1 To 4 7t:tS7{}  
    If nb <= bb(i) Then $2?j2}M  
       nb = bb(i) 8/BMFRJ  
    End If Zd-6_,r  
Next i XclTyUGoK+  
    rt(0) = Sqr(nb) +E_yEH7_)  
    rr = rt() \ "$$c  
  End If =R|XFZ,  
         [!-gb+L  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  zjQ746<&)i  

Q[biy{(b8  
有热压工艺方面的人才或者资料分享下； N}?|ik
 
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 kGYpJg9=  

高手真多！

楼主威武霸气.