[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： T
-7(3#&  
j':<7n/A  
Y-+Kf5_[  

关键点说几个： JLu$UR4  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） Zm6jF  
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 mT|r:Yr:  
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 y0) mBCX  

以下是几个重要的函数： [3tU0BU"  
1.判断点在区域中函数 j!0-3YKv  
2.计算夹角函数 #0^a-47PA<  
3.转置函数 ew c:-2Y^  
4.得到区域中心点，及区域半径函数 +I:/8,&-x  
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） N!\1O,  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 K&-uW_0  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single ybIqn0&[  
   cax = x2 - x1 VjeF3pmBa  
   cay = y2 - y1 =#{q#COK$  
   cbx = x2 - x3 PbV1FB_  
   cby = y2 - y3 jF#Dc[*  
   mo_jj = cax * cbx + cay * cby q+?q[:nR-  
   mo_ca = Sqr(cax * cax + cay * cay) YCdtf7P=q  
   mo_cb = Sqr(cbx * cbx + cby * cby) ,kFp%qNj  
   cos_acb = mo_jj / (mo_ca * mo_cb) Wk }}f|O0  
   'ff_cos = cos_acb lgbq^d  
   If cos_acb >= 1 Then fP\*5|7%R  
   nn = 0  W}Rzn  
   ElseIf cos_acb <= -1 Then ZF<$6"4N  
   nn = 3.14159265258979 DW)81*~g  
   Else C_h$$G{S(  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) I(/*pa?m{  
   End If <e@4;Z(h04  
   'ff_angle = nn I%z,s{9p  
   ff_angle = nn * 180 / 3.14159265258979 Z:,`hW*A6  
End Function

'判断点在区域内函数 M~.1:%khM  
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 nM!_C-
yX  
Dim aob, boc, cod, doa, sum As Single 'W&ewZH_h  
  If ppx = p1x And ppy = p1y Then r#J_;P{U  
     point_in = True n<A<Xj08T9  
     Exit Function 2=VFUR 8  
  End If OgzKX>N`A  
  If ppx = p2x And ppy = p2y Then A^\g]rmK  
     point_in = True F&7^M0x\ O  
     Exit Function aR)w~s\6  
  End If "=2'Oqp1  
   If ppx = p3x And ppy = p3y Then r( bA>L*mk  
     point_in = True *}>)E]O@  
     Exit Function Fj`K$K?  
  End If fBBtS S  
     X7*fmD=Uy  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 4Q,|7@  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 1q|iw  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) L=I;0Ip9y  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) A(n3<(O/{Z  
    sum = aob + boc + cod + doa Ns\};j?TU*  
    If 360.01 > sum And sum > 359.99 Then }>b@=5O  
       point_in = True p?4,YV|#  
    Else CsjrQ-#9yn  
       point_in = False _9<Mo;C  
    End If ~,x4cOdR#  
End Function

'得到点半径,得到交点坐标函数 I*n]8c  
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() tHr4/  
    '求得中心点坐标 ` ^;J<l  
Dim tt As String #S[Y}-]T  
Dim rt(3) As Single Th$xk9TK^@  
    '判断是否平行 )&%Y{a#  
   acx = p3x - p1x E,Xl8rC  
   acy = p3y - p1y 6;(b-D
hi  
   bdx = p4x - p2x "@t bm[  
   bdy = p4y - p2y %Nx,ZD@  
   If acx * bdy = acy * bdx Then lWBewnLKE  
      rt(0) = 0 h+j*vX/!  
      Exit Function `$vf9'\+  
   Else 7W>(T8K X\  
      '判断斜率存在否 xxld.j6  
      If p1x = p3x And p2x <> p4x Then \~l"  
         tt = "ac_n_bd_y" j' b0sve|?  
      ElseIf p1x <> p3x And p2x = p4x Then R^"mGe\LL  
         tt = "ac_y_bd_n" d?V/V'T[  
      ElseIf p1x <> p3x And p2x <> p4x Then Y&bO[(>1  
         tt = "ac_y_bd_y" v4Kf{
9q#  
      End If Oc5f8uv  
    Select Case tt $"MGu^0;1  
         Case "ac_n_bd_y" >4os%T  
            'bd线段方程  pQ7<\8s*  
            k_bd = bdy / bdx SH O&:2  
            b_bd = p2y - k_bd * p2x **.23<n^W  
            p_x = p1x 3Zwhv+CP[  
            p_y = k_bd * p_x + b_bd D$E#:[  
         Case "ac_y_bd_n" Zqb*-1Qw"*  
            'ac线段方程 MeAY\V%G=o  
            k_ac = acy / acx ^AERGB\36  
            b_ac = p1y - k_ac * p1x ^oNcZK>  
            p_x = p2x +Eel|)Z*Q  
            p_y = k_ac * p_x + b_ac Y' 5X4Ks|  
        Case "ac_y_bd_y" 
RMdU1
@  
           'ac，bd线段都要求 &-m}w:j=  
           k_ac = acy / acx ,bP8"|e  
           b_ac = p1y - k_ac * p1x *e:2iM)8~  
           k_bd = bdy / bdx ?8;WP&  
           b_bd = p2y - k_bd * p2x ?yu@eo  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) LLbI}:  
           p_y = k_ac * p_x + b_ac p&D7&Sb[  
        End Select +fq\K]  
      rt(1) = p_x yw1Xxwc  
      rt(2) = p_y ,fo7. h4{  
     OF:0jOW  
'计算最大半径 v9(N}hoP  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) bfkFk  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) -OnKvpeI  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) fA=Lb^,M  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) ID,os_ T=  
Dim bb(5) As Single
_qh\  
  bb(1) = rr1 9fOE.  
  bb(2) = rr2 LLMGs: [  
  bb(3) = rr3 }G!'SZ$F 5  
  bb(4) = rr4 ngk:q5Tp  
  nb = rr1 @g*[}`8]y  
For i = 1 To 4 Y@qugQM>  
    If nb <= bb(i) Then 2EO9IxIf  
       nb = bb(i) u#Bj#y!  
    End If Ak$9\Sl  
Next i ;";>7k/}  
    rt(0) = Sqr(nb) [jEA|rd~}  
    rr = rt() >t.PU.OM  
  End If fd62m]X  
         RN;#H
_ q  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  DG3Mcf@5  

G)""^YB-  
有热压工艺方面的人才或者资料分享下； 2m72PU<.  
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 \`8F.oZ^)  

高手真多！

楼主威武霸气.