[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： oeZUd}P  
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关键点说几个： SSxz
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1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） yoJ.[M4q  
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 ZDAW>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 }zS5o [OE  

以下是几个重要的函数： _~MX~M3MB  
1.判断点在区域中函数 WR`NISSp  
2.计算夹角函数 )`(]jx!  
3.转置函数 JBLUX,  
4.得到区域中心点，及区域半径函数 j}B86oX  
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） }IZw6KiN  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 QK#wsw  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single >$9
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   cax = x2 - x1 OA=~i/n~  
   cay = y2 - y1 b=xn(HE8|  
   cbx = x2 - x3 a*LfT<hmU3  
   cby = y2 - y3 D
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   mo_jj = cax * cbx + cay * cby j*gJP !  
   mo_ca = Sqr(cax * cax + cay * cay) 7(X z%v  
   mo_cb = Sqr(cbx * cbx + cby * cby) NU?<bIQ  
   cos_acb = mo_jj / (mo_ca * mo_cb) ;*t#:U*  
   'ff_cos = cos_acb aA52Li
  
   If cos_acb >= 1 Then (AtyM?*  
   nn = 0 5qW>#pTFVV  
   ElseIf cos_acb <= -1 Then A9 g%>  
   nn = 3.14159265258979 A"&<$5Q  
   Else ni%)a  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1)  >(ip-R  
   End If 0QW=2rs  
   'ff_angle = nn _p%n%Oce
 
   ff_angle = nn * 180 / 3.14159265258979 hL6;n*S=  
End Function

'判断点在区域内函数 oV0 45G  
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 irD5;xk([  
Dim aob, boc, cod, doa, sum As Single } v:YSG  
  If ppx = p1x And ppy = p1y Then m<-!~ ew  
     point_in = True $8UW^#Bpq  
     Exit Function iaEQF]*cC  
  End If f+uyO7  
  If ppx = p2x And ppy = p2y Then MkoK(m{7  
     point_in = True O
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     Exit Function WIf.;B)L  
  End If 2<I=xWwFA  
   If ppx = p3x And ppy = p3y Then ]&]DFY~n  
     point_in = True r4X}U|s!0  
     Exit Function =FhP$r*  
  End If Fy Ih\  
     0Q&(j7`^@  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) >x;\H(g  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) FUI*nkZY  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) ^gvTc+|  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) ~>u|7M$(  
    sum = aob + boc + cod + doa w=WF$)ZU  
    If 360.01 > sum And sum > 359.99 Then !Z:XSF[T  
       point_in = True )/>BgXwH  
    Else b-VygLN  
       point_in = False rN}
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    End If 3PU_STSix  
End Function

'得到点半径,得到交点坐标函数 f_S$CFa@  
Function rr(p1x As Single, p1y As Single, p2x As Single, p2y As Single, p3x As Single, p3y As Single, p4x As Single, p4y As Single) As Single() bKCE;Wu:G  
    '求得中心点坐标 hbx4[Pf  
Dim tt As String yqq1a o  
Dim rt(3) As Single (V6bX]<  
    '判断是否平行 apk,\L@sZ  
   acx = p3x - p1x F*PhV|XU  
   acy = p3y - p1y 2 3PRb<q  
   bdx = p4x - p2x <C'_:&M  
   bdy = p4y - p2y !\7`I}:  
   If acx * bdy = acy * bdx Then }b(hD|e  
      rt(0) = 0 AuXUD9-  
      Exit Function uH9Vj<E$K  
   Else ,]2?S5R  
      '判断斜率存在否 c{/R
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      If p1x = p3x And p2x <> p4x Then n]IF`kYQV  
         tt = "ac_n_bd_y" dRJ ](Gw  
      ElseIf p1x <> p3x And p2x = p4x Then XMI*obS'z  
         tt = "ac_y_bd_n" /@ @F nQ++  
      ElseIf p1x <> p3x And p2x <> p4x Then n;Oe-+oSC  
         tt = "ac_y_bd_y" dw<i)P^   
      End If ^}-l["u`  
    Select Case tt rS BI'op  
         Case "ac_n_bd_y" 4@-tT;$  
            'bd线段方程 )-3~^Y#r_  
            k_bd = bdy / bdx :.*Q@X}-I  
            b_bd = p2y - k_bd * p2x gS+X%  
            p_x = p1x pKc!sdC  
            p_y = k_bd * p_x + b_bd G7 UUx+X  
         Case "ac_y_bd_n" AhF@  
            'ac线段方程 _h-agn4[i  
            k_ac = acy / acx jV sH  
            b_ac = p1y - k_ac * p1x `}),wBq  
            p_x = p2x ; CCg]hX  
            p_y = k_ac * p_x + b_ac , lR(5ZI  
        Case "ac_y_bd_y" kS-BB[T  
           'ac，bd线段都要求 CqnHh@]nu  
           k_ac = acy / acx >j=ZB3yZ  
           b_ac = p1y - k_ac * p1x ]%6%rq%9C  
           k_bd = bdy / bdx .4CDQ&B0K  
           b_bd = p2y - k_bd * p2x oDA'$]UL  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) 3HrG^/  
           p_y = k_ac * p_x + b_ac l7VO8p]y[R  
        End Select !.j{vvQ/  
      rt(1) = p_x F|F0#HC ?  
      rt(2) = p_y L>14=Pr^(  
     %"H:
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'计算最大半径 .:j{d}p}  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) K]m#~J3d>  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) mw
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   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) `VwG]2 I  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) b/UXO$_~-  
Dim bb(5) As Single *1dZs~_  
  bb(1) = rr1 yf:0u_&]  
  bb(2) = rr2 XE2Un1i}j1  
  bb(3) = rr3 4~Cf_`X}]  
  bb(4) = rr4 ~RbVcB#  
  nb = rr1 ~%*l>GkP*  
For i = 1 To 4 N9/k`ZGC  
    If nb <= bb(i) Then %6cr4}Zm}  
       nb = bb(i) jo"nK,r  
    End If l\{Qnb(  
Next i F\JS?zt2  
    rt(0) = Sqr(nb) RDbNC v#  
    rr = rt() 6n2RTH  
  End If w@-G_-6W  
         y05!-G:Y\  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  L~+aD2E {  

Sh
RMzU  
有热压工艺方面的人才或者资料分享下； 7oLlRU  
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 ~*h)`uM  

高手真多！

楼主威武霸气.