[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： 1+jYpYEQW  
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关键点说几个： {wP|b@(1t  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） {9".o,  
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 yxN!*~BvL  
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 %?hLo8  

以下是几个重要的函数： XL^N5  
1.判断点在区域中函数 >8fH5  
2.计算夹角函数 UwkX[u  
3.转置函数 <UJJ],)^1A  
4.得到区域中心点，及区域半径函数 |"qB2.[  
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）
T''+zk  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 Lzx$"R-  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single 4V|z)=)A  
   cax = x2 - x1 ^:DhHqvK  
   cay = y2 - y1 DhNo +"!z  
   cbx = x2 - x3 F.pHL)37  
   cby = y2 - y3 |$w={N^4  
   mo_jj = cax * cbx + cay * cby AH'4H."o/9  
   mo_ca = Sqr(cax * cax + cay * cay) t!~YO'<dS  
   mo_cb = Sqr(cbx * cbx + cby * cby) s9kLB
.  
   cos_acb = mo_jj / (mo_ca * mo_cb) /lB0>Us  
   'ff_cos = cos_acb )]>G,.9C}  
   If cos_acb >= 1 Then <ytKf<a%e  
   nn = 0 ?lDcaI>+n  
   ElseIf cos_acb <= -1 Then *rcuhw"^b#  
   nn = 3.14159265258979 8@yc}~8 *  
   Else ClMtl59  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) nP\V1pgA  
   End If * \o$-6<  
   'ff_angle = nn
~Oq,[,W  
   ff_angle = nn * 180 / 3.14159265258979 $dTfvd  
End Function

'判断点在区域内函数 3H'nRK},  
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 vN,}
aV2nq  
Dim aob, boc, cod, doa, sum As Single O/Mz?$8J  
  If ppx = p1x And ppy = p1y Then `+hy#1]  
     point_in = True L);||]B  
     Exit Function 7t-*L}~WA  
  End If YKe0:cWc  
  If ppx = p2x And ppy = p2y Then [pW1=tI  
     point_in = True -[=AlqL  
     Exit Function F7Dc!JNa  
  End If P
10p<@?  
   If ppx = p3x And ppy = p3y Then %kZ~xbY  
     point_in = True rX!+@>4_L  
     Exit Function =WmBpUh  
  End If otz_nF;E  
     ? gA=39[j  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) )-.Cne;n  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) -.b Io  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) ^\vfos  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 20/
P M9  
    sum = aob + boc + cod + doa 53`9^|:  
    If 360.01 > sum And sum > 359.99 Then 9*=@/1  
       point_in = True }+{*, z  
    Else hINnb7o  
       point_in = False Q"OV>klk  
    End If q: Bt]2x  
End Function

'得到点半径,得到交点坐标函数 ,5eH2W  
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() /$FXg;h9$  
    '求得中心点坐标 V@#*``M,3  
Dim tt As String ]]J#7L#  
Dim rt(3) As Single z*M}=`M$  
    '判断是否平行 hl6,#2$  
   acx = p3x - p1x Yg=E@F   
   acy = p3y - p1y -5V)q.Og  
   bdx = p4x - p2x + ZR(  
   bdy = p4y - p2y >/TB_ykb  
   If acx * bdy = acy * bdx Then bK03S Vx  
      rt(0) = 0 ;[T
ljcbS  
      Exit Function ,
J~,ga~  
   Else *? K4!q'  
      '判断斜率存在否 `a9k!3_L  
      If p1x = p3x And p2x <> p4x Then e9~cBG|  
         tt = "ac_n_bd_y" 9RG\UbX)^|  
      ElseIf p1x <> p3x And p2x = p4x Then r#_7]_
3  
         tt = "ac_y_bd_n" pu/m8  
      ElseIf p1x <> p3x And p2x <> p4x Then `e'G.@  
         tt = "ac_y_bd_y" .sd B3x
 
      End If qDby!^ryc  
    Select Case tt -`zG_]=-  
         Case "ac_n_bd_y" -"~
L2f"?  
            'bd线段方程 M&uzOK+  
            k_bd = bdy / bdx v}7@CP]nV  
            b_bd = p2y - k_bd * p2x *Rz{44LP&  
            p_x = p1x 8A2if9E3  
            p_y = k_bd * p_x + b_bd RGT_}ni  
         Case "ac_y_bd_n" b@=zrhQ  
            'ac线段方程 gB(9vhj$  
            k_ac = acy / acx &mh Ln4^  
            b_ac = p1y - k_ac * p1x 0zeUP{MQ  
            p_x = p2x uk`T+@K  
            p_y = k_ac * p_x + b_ac YHs?QsP  
        Case "ac_y_bd_y" GN\8![J  
           'ac，bd线段都要求 7*zB*"B'1t  
           k_ac = acy / acx g~~m'^  
           b_ac = p1y - k_ac * p1x )-0[ra]  
           k_bd = bdy / bdx -L@]I$Yo  
           b_bd = p2y - k_bd * p2x d32@M~vD  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) 90Xt_$_}s  
           p_y = k_ac * p_x + b_ac ]UK`?J=t2g  
        End Select h6g=$8E  
      rt(1) = p_x "Jb3&qdU  
      rt(2) = p_y %lXbCE:[  
     WI,40&<  
'计算最大半径 q&u$0XmV  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) ?ouV   
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) (FM4 ^#6  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) ,/~[S  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) YV*b~6{d  
Dim bb(5) As Single pPoH5CzcK  
  bb(1) = rr1 .j:i&j(  
  bb(2) = rr2 [!^cd%l  
  bb(3) = rr3 W&<g} N+  
  bb(4) = rr4 h]qT1(I  
  nb = rr1 'KSa8;:=C  
For i = 1 To 4 LRWOBD  
    If nb <= bb(i) Then aw1P5aPmX  
       nb = bb(i) $9G3LgcS  
    End If hQJo~'W=  
Next i >W'j9+Va  
    rt(0) = Sqr(nb) [1NaH  
    rr = rt() <lFdexH"T  
  End If 8fnR1mWG  
         ]K7`-p~T  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  l4 "\) ];  

.=XD)>$  
有热压工艺方面的人才或者资料分享下； [4XC#OgA  
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 |1l&@#j!2  

高手真多！

楼主威武霸气.