[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： m:7bynT{  
NdQ?3'WJ  
bxHk0w  

关键点说几个： I2Q?7p  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） +y#979A,  
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 O$^YUHD  
3.网点区域密度可调；把区域分成若干小块，每块的密度不同即可 w$H
C!  

以下是几个重要的函数： 7.-|3Wcg  
1.判断点在区域中函数 7n.J.<+9  
2.计算夹角函数 VgL<uxq  
3.转置函数 #+=afJ  
4.得到区域中心点，及区域半径函数 =!aV?kNS8  
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） wEyh;ID3#  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 >d|W>|8e  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single 4BX*-t  
   cax = x2 - x1 U6"50G~u  
   cay = y2 - y1 N0NMRU]zT  
   cbx = x2 - x3 n$9!G  
   cby = y2 - y3 ektFk"W3A\  
   mo_jj = cax * cbx + cay * cby $@X,J
2&  
   mo_ca = Sqr(cax * cax + cay * cay) 3@SfCG&|e  
   mo_cb = Sqr(cbx * cbx + cby * cby) 54-x 14")  
   cos_acb = mo_jj / (mo_ca * mo_cb) -)/>qFj)  
   'ff_cos = cos_acb 3dfSu'  
   If cos_acb >= 1 Then &0myA_So  
   nn = 0 z> SCv;Q  
   ElseIf cos_acb <= -1 Then B Xp3u|t  
   nn = 3.14159265258979 w*x}4wW  
   Else $U1'n@/J  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 9dAs
XEWh  
   End If i "xq SLf=  
   'ff_angle = nn dBkB9nz  
   ff_angle = nn * 180 / 3.14159265258979 1Y_fX  
End Function

'判断点在区域内函数 Ek:u[Uw\  
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 ^gy(~u  
Dim aob, boc, cod, doa, sum As Single q\\J9`Q$J  
  If ppx = p1x And ppy = p1y Then R_csKj  
     point_in = True +KZc"0?
 
     Exit Function +oc}kv,h]  
  End If 6 J#C  
  If ppx = p2x And ppy = p2y Then ZD*>i=S  
     point_in = True c?|/c9f  
     Exit Function (NP=5lLH  
  End If AdhCC13B  
   If ppx = p3x And ppy = p3y Then cIH`,bR  
     point_in = True '7$v@Tvnre  
     Exit Function q?6Zu:':  
  End If p^2pv{by  
     qsLsyi|zG  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) }rN"H4)  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 7}xKiHh:  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) zx^)Qb/EL6  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) L^22,B 0  
    sum = aob + boc + cod + doa Qx:+n`$
/  
    If 360.01 > sum And sum > 359.99 Then 8.@yD^
'  
       point_in = True ~"(1~7_  
    Else wvfCj6}S&  
       point_in = False u931^~Ci  
    End If f!87JE=<  
End Function

'得到点半径,得到交点坐标函数 Q.nEY6B_  
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() |^FDsJUN  
    '求得中心点坐标 i cZQv]  
Dim tt As String m^`X|xK-  
Dim rt(3) As Single  X(bb1  
    '判断是否平行 H94$Xi"Bd
 
   acx = p3x - p1x RgEUTpX  
   acy = p3y - p1y uH`ds+Hp  
   bdx = p4x - p2x
kG%<5QH  
   bdy = p4y - p2y ]TGJ|X  
   If acx * bdy = acy * bdx Then }L@YLnc%  
      rt(0) = 0 A:N!H_x  
      Exit Function B3K%V|;z )  
   Else rGoB&% pc  
      '判断斜率存在否 $UKDXQF"  
      If p1x = p3x And p2x <> p4x Then )m?oQ#`m  
         tt = "ac_n_bd_y" 1W5YS +pf  
      ElseIf p1x <> p3x And p2x = p4x Then  Vb/J`  
         tt = "ac_y_bd_n" `9@!"p f  
      ElseIf p1x <> p3x And p2x <> p4x Then +1e*>jE  
         tt = "ac_y_bd_y" S!rUdxO  
      End If T `N(=T^*  
    Select Case tt yp8 .\.  
         Case "ac_n_bd_y" ao 32n  
            'bd线段方程 k/Cr ^J"  
            k_bd = bdy / bdx X!r!lW  
            b_bd = p2y - k_bd * p2x =#8J9  
            p_x = p1x K?P.1H`  
            p_y = k_bd * p_x + b_bd P||u{]vU  
         Case "ac_y_bd_n" x`a@h\n  
            'ac线段方程 Il!iqDHz3  
            k_ac = acy / acx !m78/[LW  
            b_ac = p1y - k_ac * p1x NJn~XCq  
            p_x = p2x d@`yRueWiV  
            p_y = k_ac * p_x + b_ac d d8^V_Kx  
        Case "ac_y_bd_y" )5&Wt@7Kj`  
           'ac，bd线段都要求 W.>yIA%  
           k_ac = acy / acx In
Rn!~_N  
           b_ac = p1y - k_ac * p1x K{HdqmxL.I  
           k_bd = bdy / bdx a]75z)XR  
           b_bd = p2y - k_bd * p2x *,mbZE=<  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) }eBy p  
           p_y = k_ac * p_x + b_ac l@## Ex9  
        End Select 6jom6/F 4  
      rt(1) = p_x 0M pX.
0  
      rt(2) = p_y ]kc]YO7i%R  
     ~bvx<:8*%  
'计算最大半径 HD Eqq  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 6VRVk7"  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) MiN68x9  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) erqg|TsFj  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) eDG=-a4  
Dim bb(5) As Single |qfnbi-\  
  bb(1) = rr1 f'*HP%+Y  
  bb(2) = rr2 >pz/wTOi  
  bb(3) = rr3 ;sb0,2YyP  
  bb(4) = rr4 lkB
ab$S)  
  nb = rr1 IC7n;n9  
For i = 1 To 4 6]na#<  
    If nb <= bb(i) Then h1J-AfV  
       nb = bb(i)  ,8@@r7  
    End If
|(Io(e  
Next i I5PaY.i  
    rt(0) = Sqr(nb) 4{*K%p
v\  
    rr = rt() 6$2)m;| XY  
  End If /9W-;l{=z  
         d
7P| x  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  \{P(s:  

7Oru{BQ">  
有热压工艺方面的人才或者资料分享下； 6ZR'1_i6i=  
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 r8}GiP0|  

高手真多！

楼主威武霸气.