[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： KKC%!Xy  
t?"(Zb  

描述:请输入描述

图片:2.jpg

r^5%0_F]  

关键点说几个： NF0_D1Goi  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） M P8Sd1_=  
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 # Wi?I=,  
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 Mp/l*"(  

以下是几个重要的函数： !dT+cZsf  
1.判断点在区域中函数 ~vz%I^xW  
2.计算夹角函数 Z3JUYEAS  
3.转置函数 hEHd$tH06  
4.得到区域中心点，及区域半径函数 pq`uB  
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） eN<L)a:J_  
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 U\|ZCH\]  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single s|WwB
T
 
   cax = x2 - x1 Dnd; N/9  
   cay = y2 - y1 ]L~NYe9  
   cbx = x2 - x3 (T*$4KGV  
   cby = y2 - y3 &:l-;7d  
   mo_jj = cax * cbx + cay * cby Y'iI_cg  
   mo_ca = Sqr(cax * cax + cay * cay) yMWh#[phH  
   mo_cb = Sqr(cbx * cbx + cby * cby) 2 `>a(  
   cos_acb = mo_jj / (mo_ca * mo_cb) ]qqgEZ1!Y  
   'ff_cos = cos_acb l$&~(YE f  
   If cos_acb >= 1 Then 36{GZDGQ  
   nn = 0 Wu 0:X*>}p  
   ElseIf cos_acb <= -1 Then ./ {79  
   nn = 3.14159265258979 $.vm n,:.  
   Else V<UChD)N`  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) {3x>kRaKci  
   End If DURWE,W>  
   'ff_angle = nn @e<(o UE  
   ff_angle = nn * 180 / 3.14159265258979 o,WjM[e  
End Function

'判断点在区域内函数 ZMQ=D!kT  
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 @#4-4.6I<x  
Dim aob, boc, cod, doa, sum As Single SyVGm@  
  If ppx = p1x And ppy = p1y Then >>J3"XHX  
     point_in = True KZjh<sjX|  
     Exit Function *U^Y@""a  
  End If d AcSG  
  If ppx = p2x And ppy = p2y Then g$s;;V/8e
 
     point_in = True D[yyFo,z  
     Exit Function 5z_d$.CIc  
  End If 8)0]cX  
   If ppx = p3x And ppy = p3y Then ?z1v_Jh  
     point_in = True MOD&3>NI  
     Exit Function LH4A!a]  
  End If n- 2X?<_Z  
     elR'e6Q  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) _4N.]jr5  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) bKpy?5&>  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) ~`AB-0t.u  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) P{9:XSa%  
    sum = aob + boc + cod + doa 4Et(3[P71  
    If 360.01 > sum And sum > 359.99 Then {T-\BTh&Q  
       point_in = True _uO$=4Sd  
    Else 6axxyh%  
       point_in = False `r}_92Tt  
    End If Y$L` G  
End Function

'得到点半径,得到交点坐标函数 `Xos]L'w  
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() /f[Ek5/-0  
    '求得中心点坐标 >B{qPrmI  
Dim tt As String Z^V;B _  
Dim rt(3) As Single n0=]C%wr  
    '判断是否平行 ~5HT_B U=  
   acx = p3x - p1x s^zlBvr|.  
   acy = p3y - p1y Gt&yz"?D  
   bdx = p4x - p2x %!\=$s}g  
   bdy = p4y - p2y *W8n8qG%T  
   If acx * bdy = acy * bdx Then +S{m!j%B  
      rt(0) = 0 E,m|E]WP  
      Exit Function ~ =u8H  
   Else :=hL}(~]  
      '判断斜率存在否 fDsT@W,K  
      If p1x = p3x And p2x <> p4x Then h-PJC/>  
         tt = "ac_n_bd_y" b;VI
R,2  
      ElseIf p1x <> p3x And p2x = p4x Then J920A^)j!  
         tt = "ac_y_bd_n" '^)'q\v'k  
      ElseIf p1x <> p3x And p2x <> p4x Then GUu8 N  
         tt = "ac_y_bd_y" / <(|4e  
      End If =wX;OK|U(^  
    Select Case tt %$ya>0?mq  
         Case "ac_n_bd_y" X}Q4;='C-  
            'bd线段方程 qA '^b~  
            k_bd = bdy / bdx Hpix:To  
            b_bd = p2y - k_bd * p2x 0cG[<\qT  
            p_x = p1x 2-'_Nwkl*  
            p_y = k_bd * p_x + b_bd ~a_hOKU5  
         Case "ac_y_bd_n" Y)k"KRW+  
            'ac线段方程 h>bjG  
            k_ac = acy / acx JAHg_!  
            b_ac = p1y - k_ac * p1x sN1H{W  
            p_x = p2x 2@MpWj4  
            p_y = k_ac * p_x + b_ac ,C6(  
        Case "ac_y_bd_y" i]<@  
           'ac，bd线段都要求 |WaWmp(pQ  
           k_ac = acy / acx qK$O /g,  
           b_ac = p1y - k_ac * p1x zmQQ/7K  
           k_bd = bdy / bdx `mcb0  
           b_bd = p2y - k_bd * p2x jlb8<xIC]  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) X}'rPz\Lu  
           p_y = k_ac * p_x + b_ac #om Gj&  
        End Select bDDP:INm.  
      rt(1) = p_x P\dfxR;8%  
      rt(2) = p_y
GOxP{d?  
     6/cm TT$i  
'计算最大半径 }N9PV/a  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) o%Q9]=%!  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) U>kaQ54/  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) <&[`
 +  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) nrE.0Ue1  
Dim bb(5) As Single 7J3A]>q
U  
  bb(1) = rr1 2XyyU}.$  
  bb(2) = rr2 rWWpP<  
  bb(3) = rr3 Jhj ]`$J  
  bb(4) = rr4 IgJG,!>h  
  nb = rr1 \GHj_r  
For i = 1 To 4 n=b!c@f4  
    If nb <= bb(i) Then Pjq9BK9p  
       nb = bb(i) @B0fRG y  
    End If <,O|fY%  
Next i .Od@i$E>&  
    rt(0) = Sqr(nb) <>KQ8:  
    rr = rt() uLv  
  End If L"0dB.  
         lre(]oBXA  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  =yRv*C  

S6JWsi4C:,  
有热压工艺方面的人才或者资料分享下； P=P']\`p+  
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 .
|P :n'  

高手真多！

楼主威武霸气.