[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： vjS`;^9  
nI*.(+h  
bJ^h{]  

关键点说几个： `Lr], >aG  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） T8^9*]:@c!  
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 p!UR;xHI\  
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 (4YLUN&1O$  

以下是几个重要的函数： F1Z'tj
j+  
1.判断点在区域中函数 1VJ${\H]  
2.计算夹角函数 ^ij0<*ca9  
3.转置函数 *vb"mB  
4.得到区域中心点，及区域半径函数 (0 T!-hsP  
5.再有就是若干个点抽取其中一部分；或者采用随机分布（该方法会有重合点，所以没采用） u$T]A8e  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 Gx C+lqH#  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single U6.aoqb%  
   cax = x2 - x1 x%mRDm~-  
   cay = y2 - y1 s)-oCT$[  
   cbx = x2 - x3 2 @#yQB1  
   cby = y2 - y3 &S>{9y%  
   mo_jj = cax * cbx + cay * cby pD{OB  
   mo_ca = Sqr(cax * cax + cay * cay) eRMN=qP.q  
   mo_cb = Sqr(cbx * cbx + cby * cby) ~,)jZ-fw  
   cos_acb = mo_jj / (mo_ca * mo_cb) +CSpL2@  
   'ff_cos = cos_acb xi (@\A  
   If cos_acb >= 1 Then <i~xJi%1#  
   nn = 0 a/J<(sak~X  
   ElseIf cos_acb <= -1 Then D3Q+K  
   nn = 3.14159265258979 zD{]3pg  
   Else KIF9[/P  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) -@>{q/  
   End If 7H Har'=T  
   'ff_angle = nn u^2`$W  
   ff_angle = nn * 180 / 3.14159265258979 3ahriZe  
End Function

'判断点在区域内函数 L( 6b2{"  
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 N3G9
o`k  
Dim aob, boc, cod, doa, sum As Single Q>1BOH1by  
  If ppx = p1x And ppy = p1y Then tc~gn!"  
     point_in = True B}"R@;N  
     Exit Function j9
7+'AKX  
  End If yY$^ R|t  
  If ppx = p2x And ppy = p2y Then /zIG5RK>  
     point_in = True zhJeTctRz  
     Exit Function T~UDD3  
  End If DGFSD Py[  
   If ppx = p3x And ppy = p3y Then D6ZHvY8R  
     point_in = True k{*EoV[.$  
     Exit Function Z`-$b~0  
  End If 6P{bUom?  
     !U`4  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) x;vfmgty  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) w{tA{{  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) Fs]N9],=I  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) NO5k1/-  
    sum = aob + boc + cod + doa WuK<?1meN  
    If 360.01 > sum And sum > 359.99 Then %H\b5& _y  
       point_in = True Jh+;+"  
    Else hDXTC_^s  
       point_in = False t24`*'  
    End If dS1HA>c)O  
End Function

'得到点半径,得到交点坐标函数 [Qs`@u<%  
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() qGX@mo({  
    '求得中心点坐标 a?gF;AYk  
Dim tt As String &g?GF\Y  
Dim rt(3) As Single uzp\V 39  
    '判断是否平行 hWly8B[I  
   acx = p3x - p1x SS/vw%  
   acy = p3y - p1y e=LrgRy+  
   bdx = p4x - p2x {t;o^pUF  
   bdy = p4y - p2y Oti;wf G7o  
   If acx * bdy = acy * bdx Then P#TPI*qw  
      rt(0) = 0 ~ZafTCa;  
      Exit Function 4&E"{d >  
   Else ,!> ~izB  
      '判断斜率存在否 :>!-[hfQ  
      If p1x = p3x And p2x <> p4x Then 56C8)?  
         tt = "ac_n_bd_y" B~:yM1f@u4  
      ElseIf p1x <> p3x And p2x = p4x Then d- ZUuw  
         tt = "ac_y_bd_n" ]I*RuDv}  
      ElseIf p1x <> p3x And p2x <> p4x Then A^aY-V  
         tt = "ac_y_bd_y" V_3oAu54s{  
      End If FH}?QebSR  
    Select Case tt K qJE?caw  
         Case "ac_n_bd_y" (H:c80/V  
            'bd线段方程 ")8l'^Mq2  
            k_bd = bdy / bdx .qE  
            b_bd = p2y - k_bd * p2x :uYZ1O  
            p_x = p1x ztU"CRa8  
            p_y = k_bd * p_x + b_bd ];5J  
         Case "ac_y_bd_n" -O &>HA  
            'ac线段方程 >|S@twy  
            k_ac = acy / acx =*fq5v  
            b_ac = p1y - k_ac * p1x La6 9or   
            p_x = p2x xR-;,=J  
            p_y = k_ac * p_x + b_ac ,OlS>>,  
        Case "ac_y_bd_y" _HM?p(H@  
           'ac，bd线段都要求 fDYTupKXH  
           k_ac = acy / acx POk5+^  
           b_ac = p1y - k_ac * p1x 9o,Eqx4J  
           k_bd = bdy / bdx n]6'!Eo  
           b_bd = p2y - k_bd * p2x QP~["%}T  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) [ as,AX  
           p_y = k_ac * p_x + b_ac l]wfL;u  
        End Select n\;;T1rM  
      rt(1) = p_x &Sb)a  
      rt(2) = p_y 'A{zH{
 
     9ug4p']  
'计算最大半径 #;99vwc  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) ta95]|z"j  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) xqSZ{E:  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) 0Fkr3x  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 
a)lCp  
Dim bb(5) As Single `BZ|[ q3  
  bb(1) = rr1 >}wFePl  
  bb(2) = rr2
nU=  
  bb(3) = rr3 _#M4zO7  
  bb(4) = rr4 9'(^Coq  
  nb = rr1 5~pxu  
For i = 1 To 4 QcWg  
    If nb <= bb(i) Then io\t>_  
       nb = bb(i) N?c~AEk9U  
    End If U _pPI$ =  
Next i Lp%J:ogV`  
    rt(0) = Sqr(nb) p+Q9?9  
    rr = rt() F u5zj\0J  
  End If B _ J2Bf  
         m>Z3p7!N}  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  UCj<FN `  

:}q)]W  
有热压工艺方面的人才或者资料分享下； yK"HHdYTV  
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 UHk)!P>  

高手真多！

楼主威武霸气.