[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： pXe]hnY  
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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： ]TKM.[[  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） V
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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 q8vRUlf  
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 %suXp,j  

以下是几个重要的函数： mH09* Z  
1.判断点在区域中函数 rDWqJ<8  
2.计算夹角函数 c9
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3.转置函数 :n<<hR0d  
4.得到区域中心点，及区域半径函数 8fs::}0  
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） GGchNt  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 FqK2[]8  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single L`{EXn[  
   cax = x2 - x1 c/E6}OWA  
   cay = y2 - y1 0UT2sM$  
   cbx = x2 - x3 nANoy6z:  
   cby = y2 - y3 Zcn,_b7  
   mo_jj = cax * cbx + cay * cby ,*@6NK,.  
   mo_ca = Sqr(cax * cax + cay * cay) A">A@`}  
   mo_cb = Sqr(cbx * cbx + cby * cby) ?#917M  
   cos_acb = mo_jj / (mo_ca * mo_cb) %L$P']%t@  
   'ff_cos = cos_acb vMOit,{  
   If cos_acb >= 1 Then SggS8$
a`  
   nn = 0 <C_FI` wk  
   ElseIf cos_acb <= -1 Then Kr]`.@/.S  
   nn = 3.14159265258979 *u%4]q  
   Else Ng3MfbFG  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) DHV#PLbN$  
   End If Q[k7taoy  
   'ff_angle = nn K-nf@o+  
   ff_angle = nn * 180 / 3.14159265258979 PDcZno?  
End Function

'判断点在区域内函数 ODH@/  
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 r^k:$wJbRK  
Dim aob, boc, cod, doa, sum As Single ~o+HAc`=v  
  If ppx = p1x And ppy = p1y Then M"]~}*  
     point_in = True >]k'3|vV  
     Exit Function
'%`Wy@  
  End If !#nlWX:~  
  If ppx = p2x And ppy = p2y Then :sBg+MS  
     point_in = True *Ki ],>_~  
     Exit Function r c7"sIkV  
  End If wvm`JOP:A  
   If ppx = p3x And ppy = p3y Then 'Z+~G  
     point_in = True 1TKOvy_  
     Exit Function ]cnLJ^2  
  End If |.Bb Pfe8f  
     }06  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) M ,8r{[2  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) RvYH(!pQ  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) Poacd;*  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) B8_w3;x  
    sum = aob + boc + cod + doa *Ri?mEv hF  
    If 360.01 > sum And sum > 359.99 Then /)xG%J7H  
       point_in = True p IXBJk  
    Else JI}(R4uV  
       point_in = False elZ?>5P$}  
    End If RV|: mI  
End Function

'得到点半径,得到交点坐标函数 pK#Ze/!  
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() Roy0?6O  
    '求得中心点坐标 YZf<S:  
Dim tt As String :*e0Z2=  
Dim rt(3) As Single 2"NRnCx*  
    '判断是否平行 jNV2o  
   acx = p3x - p1x &3>ki0L  
   acy = p3y - p1y -,et. *  
   bdx = p4x - p2x l'VgS:NT  
   bdy = p4y - p2y 28-6(oG  
   If acx * bdy = acy * bdx Then gqJ&Q t#f  
      rt(0) = 0 3Qe:d_  
      Exit Function Bm%:Qc*  
   Else YcGSZ0vQ  
      '判断斜率存在否 pK4I?=A'  
      If p1x = p3x And p2x <> p4x Then L._I"g5 H9  
         tt = "ac_n_bd_y" 7[QU *1bk  
      ElseIf p1x <> p3x And p2x = p4x Then er^z:1'  
         tt = "ac_y_bd_n" B}gi /  
      ElseIf p1x <> p3x And p2x <> p4x Then X4&{/;$  
         tt = "ac_y_bd_y" b/'fC%o,  
      End If q~r)B}  
    Select Case tt X(1nAeQ  
         Case "ac_n_bd_y" =V_}z3b  
            'bd线段方程 ji`N1e,l  
            k_bd = bdy / bdx /Yc!m$uCW  
            b_bd = p2y - k_bd * p2x 31wact^  
            p_x = p1x n w @cAv  
            p_y = k_bd * p_x + b_bd )dG7$,g  
         Case "ac_y_bd_n" O$Wt\Y<q  
            'ac线段方程 jwTb09  
            k_ac = acy / acx ;or(:Yoc-  
            b_ac = p1y - k_ac * p1x :HRJ49a  
            p_x = p2x lKI1bs]i  
            p_y = k_ac * p_x + b_ac vyERt^z  
        Case "ac_y_bd_y" i=reJ(y-  
           'ac，bd线段都要求 75@){ :  
           k_ac = acy / acx 4CS9vv)9R  
           b_ac = p1y - k_ac * p1x iquB]z'  
           k_bd = bdy / bdx 3ZU`}  
           b_bd = p2y - k_bd * p2x S3:Pjz}t  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) RqXcL,,9  
           p_y = k_ac * p_x + b_ac LCRreIIgZ  
        End Select z*l3O~mZ  
      rt(1) = p_x U{RW=sYB~9  
      rt(2) = p_y 85m[^WGyh  
     Q4TI '/  
'计算最大半径 B=7bQli}  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) i15uHl  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) cG,B;kMjo  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) OTL=(k  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) oU$Niw9f  
Dim bb(5) As Single X(?.*m@+TB  
  bb(1) = rr1 rv&(yA  
  bb(2) = rr2 &iR>:=ksN  
  bb(3) = rr3 "dXRUg"  
  bb(4) = rr4 ?2%d;tW  
  nb = rr1 ._~_OVU  
For i = 1 To 4  1SP)`Q  
    If nb <= bb(i) Then _$NFeqLww  
       nb = bb(i)
3@J0-w  
    End If .rD@Q{e50  
Next i x<"1T w5e  
    rt(0) = Sqr(nb) 05LVfgJ'q  
    rr = rt() 9loWh5_1Z  
  End If *O#%hTYq  
         h$DFp  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  7Ab&
C&3  

Se
N4gr*  
有热压工艺方面的人才或者资料分享下； oGM Ls  
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 lYmqFd~p  

高手真多！

楼主威武霸气.