[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： |0BmEF  
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图片:2.jpg

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关键点说几个： t :sKvJ  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） UIIR$,XB  
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 3T%WfS+  
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 /EA4-#uw  

以下是几个重要的函数： <{JHFU`^  
1.判断点在区域中函数 rX)PN3TD  
2.计算夹角函数 Gmf.lHr$%  
3.转置函数 K3M<%  
4.得到区域中心点，及区域半径函数 "n=`{~F  
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） Da0E)  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 jxm.x[1ki^  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single Eo!1 WRruF  
   cax = x2 - x1 TwqyQ49  
   cay = y2 - y1 4w}\2&=  
   cbx = x2 - x3 .R#p<"$I  
   cby = y2 - y3 )
0 .
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   mo_jj = cax * cbx + cay * cby p3M)gH=N  
   mo_ca = Sqr(cax * cax + cay * cay) ={o>g'  
   mo_cb = Sqr(cbx * cbx + cby * cby) J$%mG*Y(  
   cos_acb = mo_jj / (mo_ca * mo_cb) |K YONQ  
   'ff_cos = cos_acb snK$? 9vh  
   If cos_acb >= 1 Then . Zrt/;  
   nn = 0 G^ZL,{  
   ElseIf cos_acb <= -1 Then P>+{}c}3I  
   nn = 3.14159265258979 be|k"s|6)  
   Else MS)#S&  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) h/?8F^C#v  
   End If 47ppyh6@  
   'ff_angle = nn RF
U(wek  
   ff_angle = nn * 180 / 3.14159265258979 ),(ejRP'r  
End Function

'判断点在区域内函数 WO?EzQ ?  
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 mk2T  
Dim aob, boc, cod, doa, sum As Single O8(;=exA  
  If ppx = p1x And ppy = p1y Then @s}I_@  
     point_in = True *6sB$E_y  
     Exit Function 9$c0<~B\  
  End If UTGR{>=>  
  If ppx = p2x And ppy = p2y Then bg[k8*.:F  
     point_in = True *91iFeKj=  
     Exit Function j0B, \A  
  End If d8`^;T ;}d  
   If ppx = p3x And ppy = p3y Then LyH8T'C~  
     point_in = True ,UopGlA ,  
     Exit Function *v)JX _  
  End If iJv4%|9  
     y44FejH(v  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) ywXerz7dUk  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) S5*wUd*p#  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) B$1nq#@  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) .7++wo!,  
    sum = aob + boc + cod + doa nud,ag  
    If 360.01 > sum And sum > 359.99 Then Po'yr]pr  
       point_in = True C18pK8-  
    Else mf=,6fx28  
       point_in = False 8W)3rD>  
    End If .'mmn5E  
End Function

'得到点半径,得到交点坐标函数 rpu9  
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() rVd(H  
    '求得中心点坐标 <&\HXAOd  
Dim tt As String A^ $9[_  
Dim rt(3) As Single 6[,*2a8  
    '判断是否平行 Izm8 qt=m  
   acx = p3x - p1x )` -b\8uw  
   acy = p3y - p1y #qWa[k
B  
   bdx = p4x - p2x fp|!LU  
   bdy = p4y - p2y /1:`?% ,2  
   If acx * bdy = acy * bdx Then Iz,a Hrq  
      rt(0) = 0
8~AO~  
      Exit Function V9z/yNo  
   Else ZfM(%rx  
      '判断斜率存在否 jJdw\`  
      If p1x = p3x And p2x <> p4x Then VJ;n0*/  
         tt = "ac_n_bd_y" _?#}@?  
      ElseIf p1x <> p3x And p2x = p4x Then "]>JtK  
         tt = "ac_y_bd_n" VFz(U)._  
      ElseIf p1x <> p3x And p2x <> p4x Then *2N$l>ql:k  
         tt = "ac_y_bd_y" EzqYHY+_r  
      End If GV#"2{t j  
    Select Case tt \_}Y4  
         Case "ac_n_bd_y" wG[X*/v  
            'bd线段方程 YbB8D-  
            k_bd = bdy / bdx Uq `B#JI  
            b_bd = p2y - k_bd * p2x XSC._)ztEE  
            p_x = p1x ag^EH"%zw  
            p_y = k_bd * p_x + b_bd />c F  
         Case "ac_y_bd_n" 
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            'ac线段方程 f?kA,!  
            k_ac = acy / acx \&ra&3o  
            b_ac = p1y - k_ac * p1x #]<j.Fc`  
            p_x = p2x W(a31d  
            p_y = k_ac * p_x + b_ac W}#eQ|oCV  
        Case "ac_y_bd_y" :pj#t$:!  
           'ac，bd线段都要求 ~K]5`(KV  
           k_ac = acy / acx Cp=DdmR  
           b_ac = p1y - k_ac * p1x vggyQf%  
           k_bd = bdy / bdx zY_BnJ^  
           b_bd = p2y - k_bd * p2x S]mXfB(mh  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) +#7e?B  
           p_y = k_ac * p_x + b_ac ukb2[mb*u  
        End Select 'AU(WHf  
      rt(1) = p_x 8sjAr.iT.  
      rt(2) = p_y I!3qb-.Q  
     :S'P lH  
'计算最大半径 VCfa<hn  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) !4TMgM  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) '1{co/Y  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) xU+
c?OLi  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) &Iv3_T<
AF  
Dim bb(5) As Single tQE=c7/M  
  bb(1) = rr1 =EwC6+8*M  
  bb(2) = rr2 D_er(  
  bb(3) = rr3 xR `4<  
  bb(4) = rr4 'z7,)Q&8  
  nb = rr1 ew -5VL   
For i = 1 To 4 ,paD
/  
    If nb <= bb(i) Then XA75tU[#  
       nb = bb(i) ]`39E"zY  
    End If |2
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Next i 0V6gNEAUg  
    rt(0) = Sqr(nb) l2Z!;Wm(  
    rr = rt() 21i?$ uU  
  End If w:%3]2c  
         I?c "\Fe  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  @|A wT  

:.xdG>\n3  
有热压工艺方面的人才或者资料分享下； x.gR
TR`7(  
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 *c"tW8uR  

高手真多！

楼主威武霸气.