[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：
;^8X(R  
asYUb&Hz88  
F[0w*i&u5  

关键点说几个： MAgoxq~;V  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） <T$rvS  
2.需要定义光轴的方向；简便的方法就是指定光源坐标，及网点区域坐标，这样光轴就确定了 <\?dPRw2>  
3.网点区域密度可调；把区域分成若干小块，每块的密度不同即可 ^ }|$_  

以下是几个重要的函数： xGK"`\V  
1.判断点在区域中函数 o@r~KFIe  
2.计算夹角函数 oBWa\
N  
3.转置函数 bO+L#Kf  
4.得到区域中心点，及区域半径函数 qmbhx9V   
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） ?qczMck_  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 Zex`n:Wl?j  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single ~>5
 
   cax = x2 - x1 4Kn)5>  
   cay = y2 - y1 .\|}5J9W  
   cbx = x2 - x3 HmRmZ3~  
   cby = y2 - y3 DM*u;t{i  
   mo_jj = cax * cbx + cay * cby =~{W;VZt'  
   mo_ca = Sqr(cax * cax + cay * cay) Zs}EGC~&  
   mo_cb = Sqr(cbx * cbx + cby * cby) p/Lk'h~  
   cos_acb = mo_jj / (mo_ca * mo_cb) X5o{d4R L  
   'ff_cos = cos_acb Hc-Ke1+  
   If cos_acb >= 1 Then Cg%}=  
   nn = 0 2M?L++i  
   ElseIf cos_acb <= -1 Then _SQ0`=+  
   nn = 3.14159265258979 LKu ,H  
   Else fBct%M 3  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) p|'Rm]&jb  
   End If 4>te>[  
   'ff_angle = nn 
"l 1z@  
   ff_angle = nn * 180 / 3.14159265258979 JS0957K  
End Function

'判断点在区域内函数 \$D41_Wt|  
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 \Gz 79VW  
Dim aob, boc, cod, doa, sum As Single hZeF? G)L'  
  If ppx = p1x And ppy = p1y Then zZ{(7Kfz  
     point_in = True 0*8uo Wt&  
     Exit Function GQ=Pkko  
  End If qc@v"pIz'S  
  If ppx = p2x And ppy = p2y Then Zi ;7.PqL  
     point_in = True t-$Hti7Lk  
     Exit Function )TyI~5>;  
  End If qM:*!Aq0g  
   If ppx = p3x And ppy = p3y Then UpCkB}OhR1  
     point_in = True WOuk> /  
     Exit Function )VFS&|#\  
  End If ;q%V)4  
     _f<#+*y  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) hwd{^  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) (j884bu  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) ]`_eaW?Ua  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) l08JL  
    sum = aob + boc + cod + doa ~MLBO  
    If 360.01 > sum And sum > 359.99 Then cg'z:_l  
       point_in = True 3B[u2o>  
    Else ,ko0XQBl  
       point_in = False 1c}LX.9K  
    End If tz`T#9  
End Function

'得到点半径,得到交点坐标函数 "c0Nv8_G  
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() 53)*i\9&  
    '求得中心点坐标 PBp+(o-  
Dim tt As String C9"yu&l  
Dim rt(3) As Single K
{[N.dX(  
    '判断是否平行 EGJrnz8  
   acx = p3x - p1x xzOM\Nq?O  
   acy = p3y - p1y TrmrA$5f  
   bdx = p4x - p2x DYaOlT(rE  
   bdy = p4y - p2y /H<tv5mXJ  
   If acx * bdy = acy * bdx Then [eO6H2@=z  
      rt(0) = 0 @c^g<  
      Exit Function anxwK47  
   Else V( SRw  
      '判断斜率存在否 gaxxB]8  
      If p1x = p3x And p2x <> p4x Then TM^.y Y  
         tt = "ac_n_bd_y" (`FY{]Wz!  
      ElseIf p1x <> p3x And p2x = p4x Then Q!v]njCIB7  
         tt = "ac_y_bd_n" N"&qy3F  
      ElseIf p1x <> p3x And p2x <> p4x Then Kzf^ras4u  
         tt = "ac_y_bd_y"  _V_GdQ  
      End If OysO55
i  
    Select Case tt g"Gj8QLDz  
         Case "ac_n_bd_y" Nkg^;-CV0  
            'bd线段方程 `]4bH,%~  
            k_bd = bdy / bdx AN 'L- E  
            b_bd = p2y - k_bd * p2x DS6g_SS3  
            p_x = p1x 2;&!]2vo$  
            p_y = k_bd * p_x + b_bd &)#bdt[  
         Case "ac_y_bd_n" Trt1M  
            'ac线段方程 |;MW98 A  
            k_ac = acy / acx f4r)g2Zb[  
            b_ac = p1y - k_ac * p1x fT  
            p_x = p2x RoeLf Ow  
            p_y = k_ac * p_x + b_ac sRDxa5<MD  
        Case "ac_y_bd_y" #>\%7b59>  
           'ac，bd线段都要求 B{\qYL/~  
           k_ac = acy / acx Y<9]7R(\;  
           b_ac = p1y - k_ac * p1x _"c:Z!L  
           k_bd = bdy / bdx ;}E$>]*Yn  
           b_bd = p2y - k_bd * p2x YB3?Ftgw  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) El4SL'E@  
           p_y = k_ac * p_x + b_ac .[8g6:>  
        End Select P*.0kR1n  
      rt(1) = p_x I2^Eo5'  
      rt(2) = p_y Q_M:v  
     9  7Mi{Zz  
'计算最大半径 Tg\wBhJr|  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) z<,rE  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) j]bNOC2.L  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) _1kcz]]F  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) Q]<6i  
Dim bb(5) As Single |]'0z0>  
  bb(1) = rr1
'  
  bb(2) = rr2 o%.0@W  
  bb(3) = rr3 z`KP }-  
  bb(4) = rr4 6P U]I+  
  nb = rr1 FCA]zR1  
For i = 1 To 4 35PIfqm  
    If nb <= bb(i) Then t'im\_$F  
       nb = bb(i) Z@ZSn0  
    End If 3KN>t)A#  
Next i XL!^tMk  
    rt(0) = Sqr(nb) /j:fc?yv  
    rr = rt() Ch,%xs.)G  
  End If UhVJ!NrT  
         fs;pX/:FR  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  SdOE^_@:  

?)V}_%fVv  
有热压工艺方面的人才或者资料分享下； sksop4gu5  
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 _E<  

高手真多！

楼主威武霸气.