[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： tL}_kK_!  
.u\xA7X  
u7}C):@H  

关键点说几个： Q5>]f/LD  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） k.Q4oyei  
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 N={0A  
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 O~&j}WN  

以下是几个重要的函数： 5%;=(Oig  
1.判断点在区域中函数 XG;Dj<Dm  
2.计算夹角函数 Zil<*(kv{  
3.转置函数 8Q\ T,C  
4.得到区域中心点，及区域半径函数 53O}`xX!6  
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） "d c- !  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 $[{YE[a  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single 9Je+|+s]  
   cax = x2 - x1 v#b(0G  
   cay = y2 - y1 $J!WuOz4^i  
   cbx = x2 - x3 Twq,6X-  
   cby = y2 - y3 a}5/?/  
   mo_jj = cax * cbx + cay * cby /nzJ`d  
   mo_ca = Sqr(cax * cax + cay * cay) H.#zbKj  
   mo_cb = Sqr(cbx * cbx + cby * cby) $3yn-'o'A  
   cos_acb = mo_jj / (mo_ca * mo_cb) @\|Fd)  
   'ff_cos = cos_acb cs0rz= ZdH  
   If cos_acb >= 1 Then ).8NZ Aj
 
   nn = 0 )kvrQ6  
   ElseIf cos_acb <= -1 Then @ *n oma  
   nn = 3.14159265258979 UthM?g^  
   Else :@K~>^+U  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) @:K={AIa  
   End If ^C70b)68  
   'ff_angle = nn 
8<PQ31  
   ff_angle = nn * 180 / 3.14159265258979 n7(/ml+Q_  
End Function

'判断点在区域内函数 'W*ODAz6  
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 v{oHC4  
Dim aob, boc, cod, doa, sum As Single !m6=Us  
  If ppx = p1x And ppy = p1y Then R/Te;z  
     point_in = True !]l;n Fd  
     Exit Function e7M6|6nb  
  End If }E#1Z\)  
  If ppx = p2x And ppy = p2y Then 2aJ_[3p/h]  
     point_in = True A}G>JL  
     Exit Function *_/n$& I%&  
  End If a3C\?5  
   If ppx = p3x And ppy = p3y Then 36\_Y?zx%  
     point_in = True sDP8!  
     Exit Function XU6SYC"t%~  
  End If 5q _n6
9b  
     |Pq z0n=v  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) vBYk"a6SD  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) `@^s}rt+  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) v%;Nyab6$  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) AQTV1f_  
    sum = aob + boc + cod + doa Y3bZ&G)  
    If 360.01 > sum And sum > 359.99 Then ub]"b[j\1  
       point_in = True |6 E !wW  
    Else :ioD*k  
       point_in = False O:jaA3  
    End If C~R,,  
End Function

'得到点半径,得到交点坐标函数 Ue(\-b\)  
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() zXML<?w  
    '求得中心点坐标 O6
n]l  
Dim tt As String VvTi>2(.  
Dim rt(3) As Single @P/6NMjZ^  
    '判断是否平行 \-CL}Z}S  
   acx = p3x - p1x b=XHE1^rM  
   acy = p3y - p1y 4nKlW_{,  
   bdx = p4x - p2x fr
<V])  
   bdy = p4y - p2y (lt{$0   
   If acx * bdy = acy * bdx Then 4rUOk"li  
      rt(0) = 0 j.+}Z |  
      Exit Function k:#u%Z   
   Else $lb$<  
      '判断斜率存在否 Bb.U4#  
      If p1x = p3x And p2x <> p4x Then nx
@,oC4  
         tt = "ac_n_bd_y" BVu{To:g  
      ElseIf p1x <> p3x And p2x = p4x Then 9](RZ6A+o  
         tt = "ac_y_bd_n" Dr5AJ`y9A  
      ElseIf p1x <> p3x And p2x <> p4x Then > *soc!#Y  
         tt = "ac_y_bd_y" R
<;;Ph  
      End If bVOJp% *s  
    Select Case tt >*WT[UU  
         Case "ac_n_bd_y" \nU_UH  
            'bd线段方程 F<J`1 :  
            k_bd = bdy / bdx c+501's  
            b_bd = p2y - k_bd * p2x
,M=s3D8C  
            p_x = p1x nIGElt]  
            p_y = k_bd * p_x + b_bd yZc#@R[0  
         Case "ac_y_bd_n" ,$Xhwr  
            'ac线段方程 :H>0/^Mg0  
            k_ac = acy / acx 7'Gkip  
            b_ac = p1y - k_ac * p1x :*MR$Jf  
            p_x = p2x 6mV^akapv  
            p_y = k_ac * p_x + b_ac id[caP=`  
        Case "ac_y_bd_y" GrI<w.9X  
           'ac，bd线段都要求 pyp0SGCM:  
           k_ac = acy / acx yaYJmhG  
           b_ac = p1y - k_ac * p1x 3<_=Vyf  
           k_bd = bdy / bdx {!^0j{T  
           b_bd = p2y - k_bd * p2x mX[J15  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) Yb4%W-5  
           p_y = k_ac * p_x + b_ac r0q?e`nsA  
        End Select #@J{ )  
      rt(1) = p_x j7~Rw"(XQc  
      rt(2) = p_y :M8y 2fh  
     /6:qmh2  
'计算最大半径 /xCX. C  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) :Z+Jt=;  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) ]Rj?OSok  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) yiMqe^zy  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) C(kL
=WD   
Dim bb(5) As Single 'oF XNO  
  bb(1) = rr1 Qcn;:6_&W  
  bb(2) = rr2 )j. .)o  
  bb(3) = rr3 Bo8NY!  
  bb(4) = rr4 WWT1_&0  
  nb = rr1 !o\e/HGc!  
For i = 1 To 4 gv,1 CK  
    If nb <= bb(i) Then [DvQk?,t  
       nb = bb(i) m]Mm(7v(  
    End If l OiZ2_2  
Next i p$mt&,p  
    rt(0) = Sqr(nb) onl,R{,`0  
    rr = rt() /rHlFl|Wy  
  End If B7PdavO#  
         3Scc"9]  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  a&UzIFdB  

g@T}h[  
有热压工艺方面的人才或者资料分享下； vPc*x5w-  
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 e\O-5hp7  

高手真多！

楼主威武霸气.