[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： {jG`l$$  
)v0vdAh'b  

描述:请输入描述

图片:2.jpg

[Nc
Ok,  

关键点说几个： DBRJtU!5x  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） -C+vmY*@  
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 qT4s*kqr  
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 :ux`*,zh  

以下是几个重要的函数： wah`  
1.判断点在区域中函数 `upNP/,  
2.计算夹角函数 W#!\.m`5  
3.转置函数 cx|j _5%i  
4.得到区域中心点，及区域半径函数 i`~y%y  
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） Gf?KpU  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 4]bTO  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single d
,77L  
   cax = x2 - x1 hk I$ow(  
   cay = y2 - y1 S,H{\c  
   cbx = x2 - x3 zP9!fA  
   cby = y2 - y3 P(`IY+  
   mo_jj = cax * cbx + cay * cby dY,'6JzC  
   mo_ca = Sqr(cax * cax + cay * cay) R|suBF3  
   mo_cb = Sqr(cbx * cbx + cby * cby) 'Khq!pC   
   cos_acb = mo_jj / (mo_ca * mo_cb) D1f=f88/}  
   'ff_cos = cos_acb 0`W~
2ai  
   If cos_acb >= 1 Then )~`zjVx_  
   nn = 0
Ssj'1[%  
   ElseIf cos_acb <= -1 Then ^tv*I~>J!  
   nn = 3.14159265258979 ^{w&&+#,q  
   Else g@Zc'g/XB  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 9YJb~tuZ73  
   End If A-
W7!0  
   'ff_angle = nn W.a/k7 p  
   ff_angle = nn * 180 / 3.14159265258979 YblRwic  
End Function

'判断点在区域内函数 ctZW7  
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 s+[=nau('w  
Dim aob, boc, cod, doa, sum As Single O!g>
f  
  If ppx = p1x And ppy = p1y Then rdb%/@.-  
     point_in = True R9W(MLe58  
     Exit Function sJr$[?  
  End If e9 NHbq  
  If ppx = p2x And ppy = p2y Then #_E8>;)k  
     point_in = True _ReQQti[
 
     Exit Function lY1m%  
  End If /nrD
U*  
   If ppx = p3x And ppy = p3y Then IQM!dC  
     point_in = True ri:fo'4TO  
     Exit Function =3"Nn4Z  
  End If DGU$3w  
     Dx
Yu   
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) WDZEnauE  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) <W?,n%  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) 78X;ZMY  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) u7/M>YJ`
T  
    sum = aob + boc + cod + doa jk|0<-3  
    If 360.01 > sum And sum > 359.99 Then v}!,4,]:&  
       point_in = True PXkPC%j  
    Else dlWw=^  
       point_in = False ENGw <  
    End If lj[Bd >  
End Function

'得到点半径,得到交点坐标函数 hP7nt  
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() ZQyT$l~b  
    '求得中心点坐标 9u:MF0:W  
Dim tt As String (s9?#t6  
Dim rt(3) As Single )ow3Bl8w  
    '判断是否平行 H fRxgA@  
   acx = p3x - p1x &o?pZ(\C  
   acy = p3y - p1y _-D(N/  
   bdx = p4x - p2x 5X  
   bdy = p4y - p2y .D7\Hao  
   If acx * bdy = acy * bdx Then /O8'8sL5  
      rt(0) = 0
7Fq|Zc`P  
      Exit Function *kDXx&7B$  
   Else D.HAp+lx  
      '判断斜率存在否 >_5D`^  
      If p1x = p3x And p2x <> p4x Then <cl$?].RE!  
         tt = "ac_n_bd_y" t$}+oCnkv  
      ElseIf p1x <> p3x And p2x = p4x Then 72PDqK#  
         tt = "ac_y_bd_n" \O^= Z{3y  
      ElseIf p1x <> p3x And p2x <> p4x Then ~zuMX;[  
         tt = "ac_y_bd_y" cd:O@)i  
      End If 9J>DLvl;  
    Select Case tt QJv,@@mu  
         Case "ac_n_bd_y" 5Wn6a$^  
            'bd线段方程 "r[Ea|  
            k_bd = bdy / bdx ncWASw`  
            b_bd = p2y - k_bd * p2x  fBQZ=zh  
            p_x = p1x i4->XvC  
            p_y = k_bd * p_x + b_bd V-jo2+Y5=  
         Case "ac_y_bd_n" {2V=BDS|?K  
            'ac线段方程 T*$uc,  
            k_ac = acy / acx p<jHUG4?'  
            b_ac = p1y - k_ac * p1x E P<U:F  
            p_x = p2x jSddjs  
            p_y = k_ac * p_x + b_ac vK6bpzI 3  
        Case "ac_y_bd_y" C#gQJ=!B  
           'ac，bd线段都要求 D]4?
UL  
           k_ac = acy / acx +[cm  
           b_ac = p1y - k_ac * p1x hwexv 9""  
           k_bd = bdy / bdx b?r0n]  
           b_bd = p2y - k_bd * p2x bi,%QZZ  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) & ??)gMM[  
           p_y = k_ac * p_x + b_ac I{M2nQi  
        End Select F9d][ P@@  
      rt(1) = p_x ~)()PO  
      rt(2) = p_y YrB-;R1+  
     ZkqC1u3  
'计算最大半径 Q(%uDUg%  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) Ir]b.6B  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) zO!`sPP  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) u<+;]8[o  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 0}aJCJ9sx=  
Dim bb(5) As Single 0V1kZ.  
  bb(1) = rr1 P~?u2,.E[  
  bb(2) = rr2 u_mm*o~)g  
  bb(3) = rr3 >+8mq]8^  
  bb(4) = rr4 8o~
\L= l  
  nb = rr1 X_=oJi|:  
For i = 1 To 4 Va9vDb6  
    If nb <= bb(i) Then GifD>c |z  
       nb = bb(i) \Z)''
:},C  
    End If Q9rE_}Z  
Next i {0e5<"i  
    rt(0) = Sqr(nb) "i#!  
    rr = rt() rPQ$e!m1Ee  
  End If H4%wq  
         iPHMyxT+S  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  VRMlr.T+  

M}us^t*  
有热压工艺方面的人才或者资料分享下； -@AGQ+e  
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 a'Aru^el  

高手真多！

楼主威武霸气.