[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： -CLBf'a  
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关键点说几个： K[yP{01  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） +U)4V}S)  
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 1gQ_76Yck  
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 .$fSWlM;  

以下是几个重要的函数： q@g#DP+C  
1.判断点在区域中函数 O?ODfO+>  
2.计算夹角函数 Lt ^*L%x  
3.转置函数 i+F*vTM2,  
4.得到区域中心点，及区域半径函数 JIIc4fyy8s  
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） v: veKA  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 TB-dV'w  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single {,u})U2  
   cax = x2 - x1
Y'5(exW  
   cay = y2 - y1 cUr!U\X[  
   cbx = x2 - x3 w51l;2$des  
   cby = y2 - y3 N6v?Qzvi  
   mo_jj = cax * cbx + cay * cby vZW[y5  
   mo_ca = Sqr(cax * cax + cay * cay) ?J,,RK.  
   mo_cb = Sqr(cbx * cbx + cby * cby) e"_kH_7sv  
   cos_acb = mo_jj / (mo_ca * mo_cb) ANNVE},  
   'ff_cos = cos_acb T@*'}*  
   If cos_acb >= 1 Then 8N+T=c  
   nn = 0 =H3tkMoi2  
   ElseIf cos_acb <= -1 Then ,@/O\fit)  
   nn = 3.14159265258979 0ckmHv  
   Else r<4j;"lQK  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) |j81?4<)v  
   End If Ctn 4q'Q  
   'ff_angle = nn wZN_YFwQ  
   ff_angle = nn * 180 / 3.14159265258979 .xuzu#-  
End Function

'判断点在区域内函数 awwSgy  
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 +'-.c"  
Dim aob, boc, cod, doa, sum As Single wMj#.Jh  
  If ppx = p1x And ppy = p1y Then s'
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     point_in = True pu+Q3NfR  
     Exit Function SJ<v<
B  
  End If w#[cGaIB  
  If ppx = p2x And ppy = p2y Then B~7!v${  
     point_in = True 0#Lmajs  
     Exit Function o{! :N>(  
  End If ]gg(Z!|iQ  
   If ppx = p3x And ppy = p3y Then vXRY/Zzj1  
     point_in = True pA8As  
     Exit Function =u?aP}zc  
  End If rv(?%h`  
     B~N3k  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) \0d'y#Gp*  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) Hcwfe=K&/  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) 5.oIyC^Ik  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) : S3+
UT  
    sum = aob + boc + cod + doa pITF%J@_]  
    If 360.01 > sum And sum > 359.99 Then <JH,B91  
       point_in = True z-
606g  
    Else w$6Z}M1d  
       point_in = False 3,Yr%`/5'  
    End If 8"9&x} tl-  
End Function

'得到点半径,得到交点坐标函数 7!pKlmQ  
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() qrYbc~jI7  
    '求得中心点坐标 $vfgYl4q  
Dim tt As String 8ROKfPj;z  
Dim rt(3) As Single Ze eV-  
    '判断是否平行 /oHCV0!0  
   acx = p3x - p1x &Y=0 0  
   acy = p3y - p1y ERV]N:(  
   bdx = p4x - p2x d@$|zr6  
   bdy = p4y - p2y > 0MP[  
   If acx * bdy = acy * bdx Then 'R79,)|;[  
      rt(0) = 0 eKvr1m- -  
      Exit Function Iz09O:ER  
   Else >8"Svt$  
      '判断斜率存在否 /;#kV]nF  
      If p1x = p3x And p2x <> p4x Then eZa*WI=  
         tt = "ac_n_bd_y" vTO9XHc E  
      ElseIf p1x <> p3x And p2x = p4x Then #`*uX6C  
         tt = "ac_y_bd_n" OL
>>/T  
      ElseIf p1x <> p3x And p2x <> p4x Then @@Ybg6.+*  
         tt = "ac_y_bd_y" ORs:S$Nt$  
      End If V|97;  
    Select Case tt #dWz,e3   
         Case "ac_n_bd_y" tF`L]1r>  
            'bd线段方程 <|}Z6Ti  
            k_bd = bdy / bdx e$Ds2%SaT  
            b_bd = p2y - k_bd * p2x B>^6tdz  
            p_x = p1x 'K?h6?#  
            p_y = k_bd * p_x + b_bd j2MA['{  
         Case "ac_y_bd_n" \5r^D|Rp}  
            'ac线段方程 5-|!mSd  
            k_ac = acy / acx ?ZlXh51  
            b_ac = p1y - k_ac * p1x [Y .8C$0  
            p_x = p2x z4:!*:.Asu  
            p_y = k_ac * p_x + b_ac j%Au0k
 
        Case "ac_y_bd_y" yS W$zA,  
           'ac，bd线段都要求 1_]X  
           k_ac = acy / acx 9&eY<'MgP  
           b_ac = p1y - k_ac * p1x ;{sZDjev>  
           k_bd = bdy / bdx L1SKOM$  
           b_bd = p2y - k_bd * p2x N>H@vt~  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) STW?0B'Jr  
           p_y = k_ac * p_x + b_ac j~-N2b6z  
        End Select O2{["c e  
      rt(1) = p_x c| ^I}  
      rt(2) = p_y -qIi.]/f"9  
     */;7Uv7  
'计算最大半径 o8g7wM]M  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) \Ggh 95y  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) jq,M1  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) OX7=g$S 1  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) I@cw=_EQL  
Dim bb(5) As Single el9P@r0  
  bb(1) = rr1 I`V<Sh^Qd  
  bb(2) = rr2 9p W~Gz  
  bb(3) = rr3 = j1Jl^[  
  bb(4) = rr4 %GhI0F #  
  nb = rr1 ~XTC:6ts  
For i = 1 To 4 Tz @=N]D  
    If nb <= bb(i) Then 8_('[89m  
       nb = bb(i) #DUfEZ  
    End If W@T\i2r$z  
Next i 4Hj)Av<O(  
    rt(0) = Sqr(nb) z{rV|vQ  
    rr = rt() GTP'js  
  End If X0;u7g2Yz  
         Z3S+")^  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  qf? "v;  

'(vZfzc{J  
有热压工艺方面的人才或者资料分享下； 0AB a&'h  
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
<fCGU  

高手真多！

楼主威武霸气.