[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： Ty|c@X  

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关键点说几个： @z JZoJL]J  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） r9'H7J  
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 >
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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 V+~
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以下是几个重要的函数： +Z(VWu6  
1.判断点在区域中函数 TmAb! Y|F  
2.计算夹角函数 <rmV$_  
3.转置函数 LbI])M  
4.得到区域中心点，及区域半径函数 \eN/fTPm  
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） CnA)>4E*'  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 M<pgaB0  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single FEswNB(]*  
   cax = x2 - x1 nE%qm -  
   cay = y2 - y1 Vo8"/]_h  
   cbx = x2 - x3 _I5+o\;1  
   cby = y2 - y3 HjR<4;2  
   mo_jj = cax * cbx + cay * cby x"De 9SB  
   mo_ca = Sqr(cax * cax + cay * cay) K%Ml2V   
   mo_cb = Sqr(cbx * cbx + cby * cby) R;2 -/MT-  
   cos_acb = mo_jj / (mo_ca * mo_cb) zKT<QM!`  
   'ff_cos = cos_acb <9ph c  
   If cos_acb >= 1 Then  ?C\9
lLX  
   nn = 0 d_B5@9e#  
   ElseIf cos_acb <= -1 Then vLS6Gb't  
   nn = 3.14159265258979 }epN<DL  
   Else p4_uY7^6  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1)
mq9&To!  
   End If #JM*QVzv  
   'ff_angle = nn .1}(Bywm5  
   ff_angle = nn * 180 / 3.14159265258979 .p_$]  
End Function

'判断点在区域内函数 aR $P}]H  
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?I3xb  
Dim aob, boc, cod, doa, sum As Single K)OlCpHc  
  If ppx = p1x And ppy = p1y Then EZV$1pa  
     point_in = True T94$}- 5/)  
     Exit Function en)DN3  
  End If AQZ\
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  If ppx = p2x And ppy = p2y Then x]T;W&s  
     point_in = True ktRdf6:~  
     Exit Function ,55`s#;  
  End If 0}N^l=jQ  
   If ppx = p3x And ppy = p3y Then :8g \B{  
     point_in = True Fjb[Ev  
     Exit Function IK);BN2<L  
  End If ,5:86'p  
     H++rwVwj#h  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 50A_+f.7%  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) B%/Pn 2  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) I%`2RXBt3^  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) &D#v0!e~x  
    sum = aob + boc + cod + doa :QNEA3Q  
    If 360.01 > sum And sum > 359.99 Then 7 &Aakl  
       point_in = True ptcU_*Gd  
    Else 3-D!ZS&  
       point_in = False ^y,ip=<5\3  
    End If 8:bNFgJD  
End Function

'得到点半径,得到交点坐标函数 %oo&
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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~5l?4u#  
    '求得中心点坐标 U Lq%,ca  
Dim tt As String IP3-lru  
Dim rt(3) As Single iu .{L(m  
    '判断是否平行 nJnan,`W  
   acx = p3x - p1x -#r_9HQ,w  
   acy = p3y - p1y =@'"\ "Nh  
   bdx = p4x - p2x t9}XO M*  
   bdy = p4y - p2y ZI1RB fR  
   If acx * bdy = acy * bdx Then zV]0S o  
      rt(0) = 0 ':=C2x1d|  
      Exit Function {SJLM0=Z  
   Else c8u0\X,  
      '判断斜率存在否 1Sy#*  
      If p1x = p3x And p2x <> p4x Then vR,'':  
         tt = "ac_n_bd_y" *=8)]_=f  
      ElseIf p1x <> p3x And p2x = p4x Then ~gf$ L9  
         tt = "ac_y_bd_n" `e bB+gI  
      ElseIf p1x <> p3x And p2x <> p4x Then d dPJx<  
         tt = "ac_y_bd_y" SCo9[EJ  
      End If qrdI"  
    Select Case tt qhtc?A/0}  
         Case "ac_n_bd_y" B@4#y9`5  
            'bd线段方程 z(xvt>  
            k_bd = bdy / bdx ]1K &U5p  
            b_bd = p2y - k_bd * p2x u0,~pJvX  
            p_x = p1x 86Rit!ih  
            p_y = k_bd * p_x + b_bd U;31}'b  
         Case "ac_y_bd_n" YW5E |z  
            'ac线段方程 m
s$o,[  
            k_ac = acy / acx PIA&s6U  
            b_ac = p1y - k_ac * p1x 1ysA~2  
            p_x = p2x O Rfl v+  
            p_y = k_ac * p_x + b_ac
LCG<  
        Case "ac_y_bd_y" `XnFc*L 1  
           'ac，bd线段都要求 _eF*8 /z  
           k_ac = acy / acx kB 2bT}  
           b_ac = p1y - k_ac * p1x 4Vs;Y&t]  
           k_bd = bdy / bdx +SJ aE] $  
           b_bd = p2y - k_bd * p2x zt8ZJlNK  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) [H&m@*UO  
           p_y = k_ac * p_x + b_ac Vf@/}=X *  
        End Select YP7<j*s8  
      rt(1) = p_x "n\!y~:  
      rt(2) = p_y I}:/v$btM  
     9we=aX5  
'计算最大半径 29GiNy+ob  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) M_e!s}F  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) 1vThb  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) 4 qnQF]4  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 8177x7UG2[  
Dim bb(5) As Single {r"
s.|
n  
  bb(1) = rr1  }N[sydL  
  bb(2) = rr2 {hl_/ aG  
  bb(3) = rr3 r}991O<  
  bb(4) = rr4 4e:hKv,+4  
  nb = rr1 }
"T:z{n  
For i = 1 To 4 L+u_153  
    If nb <= bb(i) Then pSAXp#g  
       nb = bb(i) O~D}&M@/R  
    End If ] =D+a&  
Next i vL><Y.kOEs  
    rt(0) = Sqr(nb) QK72F  
    rr = rt() E )PEKWK\  
  End If 83dOSS2  
         >hXUq9;:  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  jW6@U%[!b  

0wc+<CUW  
有热压工艺方面的人才或者资料分享下； aB$Y5  
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 !|}>Y  

高手真多！

楼主威武霸气.