[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： =+{.I,g}g@  
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描述:请输入描述

图片:2.jpg

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关键点说几个： @2 dp5  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） jh]wHG  
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 $*%Ml+H-  
3.网点区域密度可调；把区域分成若干小块，每块的密度不同即可 t4?g_$>   

以下是几个重要的函数： ~u8}s4  
1.判断点在区域中函数 K 3&MR=#^  
2.计算夹角函数 @DkPJla&  
3.转置函数 scqG$~O)  
4.得到区域中心点，及区域半径函数 !{s$V2_  
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） 5"y p|Yl  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 FEaf&'G]  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single )0AE*S  
   cax = x2 - x1 AXPUJ?V  
   cay = y2 - y1 9qXHdpb#g"  
   cbx = x2 - x3 r'&9'rir2  
   cby = y2 - y3 um#;S;  
   mo_jj = cax * cbx + cay * cby "XC6 l4Z  
   mo_ca = Sqr(cax * cax + cay * cay) 7@EYF  
   mo_cb = Sqr(cbx * cbx + cby * cby) $'9r=#EH  
   cos_acb = mo_jj / (mo_ca * mo_cb) /gy;~eB01  
   'ff_cos = cos_acb c#"\&~. P  
   If cos_acb >= 1 Then r-N2*uYtu  
   nn = 0 }~QB2&3  
   ElseIf cos_acb <= -1 Then .2xypL8(  
   nn = 3.14159265258979 gyCb\y+\a  
   Else {k
?Y:  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) >+vWtO2  
   End If IH~H6US  
   'ff_angle = nn fws
q:  
   ff_angle = nn * 180 / 3.14159265258979 7U.g4x|<  
End Function

'判断点在区域内函数 X'?v8\mPK  
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 XIjSwR kYJ  
Dim aob, boc, cod, doa, sum As Single pHg8(ru|  
  If ppx = p1x And ppy = p1y Then sM5 w~R>Y  
     point_in = True ?sS'T7r v  
     Exit Function M\v4{\2l0  
  End If Z:/S@ry  
  If ppx = p2x And ppy = p2y Then '|XP}V0I  
     point_in = True ,s)~Y p?<  
     Exit Function \o % ES  
  End If ^_+ks/  
   If ppx = p3x And ppy = p3y Then ~:t2@z4p  
     point_in = True =]zPUzr,|  
     Exit Function TS[Z<m  
  End If 4tuEC-oh  
     J$EE
pL  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) (B$FX<K3  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) iMA)(ZS  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) ycE<7W  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 1|. 0]~0  
    sum = aob + boc + cod + doa 6wu/6DO   
    If 360.01 > sum And sum > 359.99 Then \FKIEg+(2  
       point_in = True vy#c(:UQR  
    Else Y4714  
       point_in = False njq-
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    End If sQ)4kF&,  
End Function

'得到点半径,得到交点坐标函数 s24H.>Z  
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() .X
E]vo  
    '求得中心点坐标 6h,'#|:d  
Dim tt As String nx+& {hn(  
Dim rt(3) As Single $I/p6  
    '判断是否平行 aLq;a  
   acx = p3x - p1x y@Or2bO#  
   acy = p3y - p1y 5 O6MI4:  
   bdx = p4x - p2x LtU+w*Gj  
   bdy = p4y - p2y h/k`+  
   If acx * bdy = acy * bdx Then xD#/@E1'Y  
      rt(0) = 0 n^%u9H  
      Exit Function n$?oZ*;  
   Else w:N2 xI  
      '判断斜率存在否 0IdD  
      If p1x = p3x And p2x <> p4x Then $+);!?^|:  
         tt = "ac_n_bd_y" #RD%GLY  
      ElseIf p1x <> p3x And p2x = p4x Then W6iIL
:sp  
         tt = "ac_y_bd_n" B>mQ\Q  
      ElseIf p1x <> p3x And p2x <> p4x Then 3TtW2h
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         tt = "ac_y_bd_y" HkN +:  
      End If *o#`lH  
    Select Case tt ={Hbx>p  
         Case "ac_n_bd_y" Mzd}9x$'J  
            'bd线段方程 *,p
qpD>  
            k_bd = bdy / bdx `2oi~^.  
            b_bd = p2y - k_bd * p2x ?l(hS\N,  
            p_x = p1x B::?  
            p_y = k_bd * p_x + b_bd +W1rm$Q  
         Case "ac_y_bd_n" DXGO-]!!0  
            'ac线段方程 : L>d]Hn  
            k_ac = acy / acx 6{~I7!m"  
            b_ac = p1y - k_ac * p1x DNy)\+[  
            p_x = p2x FN R& :  
            p_y = k_ac * p_x + b_ac O`=Uq0Vv  
        Case "ac_y_bd_y" [Wh 43Z  
           'ac，bd线段都要求 21[F%,{.),  
           k_ac = acy / acx ]5\vYk  
           b_ac = p1y - k_ac * p1x Kv7NCpq'  
           k_bd = bdy / bdx 6xe |L  
           b_bd = p2y - k_bd * p2x O+N-x8W{  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) MI}D%n*  
           p_y = k_ac * p_x + b_ac 7ou^wt+%  
        End Select ZZ(@:F  
      rt(1) = p_x 1:t>}[Y  
      rt(2) = p_y b+hY^$//  
     bsm,lx]bH^  
'计算最大半径 {;zPW!G  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 8\9EDgT  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) j$^]WRt  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) P33E\O  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) vn<S"  
Dim bb(5) As Single :]s] =q&]  
  bb(1) = rr1 AL0Rn e N  
  bb(2) = rr2 MlZ`g,{  
  bb(3) = rr3 &}cie"\L  
  bb(4) = rr4 gg(U}L ]:  
  nb = rr1 Exr7vL  
For i = 1 To 4 dq(x@&J  
    If nb <= bb(i) Then =-qsz^^a-  
       nb = bb(i) x_K%  
    End If *`#,^p`j b  
Next i u_BSWhiW  
    rt(0) = Sqr(nb) =+p+_}C  
    rr = rt() @2gMtf?<  
  End If tp<VOUa  
         g&>Hy!v,  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15) 
d~-p;i  

'%C.([  
有热压工艺方面的人才或者资料分享下； ?7)(qnbe"  
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 S.|kg2  

高手真多！

楼主威武霸气.