[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： )4a&OlEI  
COj50t/  
11 .RG *  

关键点说几个： (^9q7)n  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） _q=$L eO5  
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 A A<9XC  
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 
9GkG'  

以下是几个重要的函数： f8N  
1.判断点在区域中函数 =}r&>|rrJ  
2.计算夹角函数 /43DR;4  
3.转置函数 kzns:-a  
4.得到区域中心点，及区域半径函数 &N*S   
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） -j]r\EVKS  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 ?_W "=WpC  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single RURO0`^  
   cax = x2 - x1 Q-O:L  
   cay = y2 - y1 i3;Z:,A4NN  
   cbx = x2 - x3 t wtGkkC  
   cby = y2 - y3 wXXv0OzK  
   mo_jj = cax * cbx + cay * cby qg:1  
   mo_ca = Sqr(cax * cax + cay * cay) -&))$h3o\  
   mo_cb = Sqr(cbx * cbx + cby * cby) +Z$X5Th  
   cos_acb = mo_jj / (mo_ca * mo_cb) l%fnGe` _  
   'ff_cos = cos_acb x gaN0!  
   If cos_acb >= 1 Then '4dnC2a]  
   nn = 0 S][:b  
   ElseIf cos_acb <= -1 Then U@m<  
   nn = 3.14159265258979 *[W!ng  
   Else Ao`9fI#q  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) ^;W,:y&  
   End If #dW$"u  
   'ff_angle = nn 6$)Yqg`X  
   ff_angle = nn * 180 / 3.14159265258979 9<[RXY  
End Function

'判断点在区域内函数 7gD$Q
 
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 7ou2SL}k  
Dim aob, boc, cod, doa, sum As Single RFg$N@g,  
  If ppx = p1x And ppy = p1y Then 4y 582u6^  
     point_in = True GsqrKrbJ  
     Exit Function HX+'{zm]  
  End If `j4ukOnG  
  If ppx = p2x And ppy = p2y Then z6'zNM7M  
     point_in = True )]>=Uo  
     Exit Function h5Qxa$Oq  
  End If 8"8sI  
   If ppx = p3x And ppy = p3y Then Om>6<3n  
     point_in = True rCYNdfdpp  
     Exit Function `9S<E  
  End If .t"s>jq 1  
     vuDp_p*]S  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) Y/gVyQ(  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 9J%dd0  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) BR5$;-7W  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 6],5X^*Y  
    sum = aob + boc + cod + doa !R{L`T0  
    If 360.01 > sum And sum > 359.99 Then Ms^Y:,;Hi  
       point_in = True ' 'UiQ  
    Else UvQxtT]  
       point_in = False r^*,eF  
    End If _e~EQ[,  
End Function

'得到点半径,得到交点坐标函数 [|k@Suv |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() J#:%| F%  
    '求得中心点坐标 IWm|6@y  
Dim tt As String <]CO}r   
Dim rt(3) As Single !8l4H
c8  
    '判断是否平行 ;"joebZ/  
   acx = p3x - p1x  U]e;=T:3  
   acy = p3y - p1y A`X$jpAn&  
   bdx = p4x - p2x 8 A%)m  
   bdy = p4y - p2y \P{VJ^)0  
   If acx * bdy = acy * bdx Then RMLs(?e  
      rt(0) = 0 p_P'2mf  
      Exit Function Rfa1v*(  
   Else d['BtVJ  
      '判断斜率存在否 #[I`VA\x  
      If p1x = p3x And p2x <> p4x Then hz\7Z+$L_  
         tt = "ac_n_bd_y" "V?U^L>SF  
      ElseIf p1x <> p3x And p2x = p4x Then F5+f?B~?R?  
         tt = "ac_y_bd_n" 'Ur$jW  
      ElseIf p1x <> p3x And p2x <> p4x Then 5<ery~q  
         tt = "ac_y_bd_y" :j?Lil%R  
      End If v9M;W+J  
    Select Case tt B[cZEFo\
 
         Case "ac_n_bd_y" q'c'rN^  
            'bd线段方程 EVRg/{X  
            k_bd = bdy / bdx A5?[j QT0  
            b_bd = p2y - k_bd * p2x +uv]d
D*i  
            p_x = p1x bS* "C,b~s  
            p_y = k_bd * p_x + b_bd Mg^GN-l  
         Case "ac_y_bd_n" E>SnH  
            'ac线段方程 j>
?c]h{-  
            k_ac = acy / acx &*MwKr<y  
            b_ac = p1y - k_ac * p1x _Y}(v((;  
            p_x = p2x ]_F%{8|  
            p_y = k_ac * p_x + b_ac lm]4zs /A  
        Case "ac_y_bd_y" qjUQ2
d  
           'ac，bd线段都要求 &IOChQ`8P  
           k_ac = acy / acx Cd6^aFoK!  
           b_ac = p1y - k_ac * p1x c5]^jUB6  
           k_bd = bdy / bdx
ivw2EEo,  
           b_bd = p2y - k_bd * p2x (B,CL222x  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) ":eHR}Hzx  
           p_y = k_ac * p_x + b_ac R:i7Rb2C  
        End Select 8~rD#8`6j  
      rt(1) = p_x `C] t2^  
      rt(2) = p_y oh#6>|  
     t[iE >  
'计算最大半径 !:rQ@PSy9  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) I^\YD9~=x  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) obaJT"1  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) \gj@O5rGP  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) p0'A\@|  
Dim bb(5) As Single 6^UeEmjc  
  bb(1) = rr1 -br/  
  bb(2) = rr2 [T~O%ly7x&  
  bb(3) = rr3 )Hl;9  
  bb(4) = rr4 ,Iwri\  
  nb = rr1 Wx;9N  
For i = 1 To 4 x:
@HtTX  
    If nb <= bb(i) Then 5XA6IL|/l  
       nb = bb(i) Xm\tyLY  
    End If x1Z?x,-D"  
Next i 3H@TvV/;f  
    rt(0) = Sqr(nb) ?sp  
    rr = rt() !t~S.`
vF  
  End If q=UKL`;C}U  
         :
4&qASn  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  = 14'R4:  

U$ _?T-x  
有热压工艺方面的人才或者资料分享下； #xm<|s   
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 :&#hjeltt  

高手真多！

楼主威武霸气.