[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： bPOx~ CMh  
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关键点说几个： OeYLL4H  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） =F&RQ}$  
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 2X*<Fma3C  
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 W,~1KUTc  

以下是几个重要的函数：
,7P^]V1  
1.判断点在区域中函数 e_], O_Z  
2.计算夹角函数 2[po~}2-0  
3.转置函数 5@$4.BGcF  
4.得到区域中心点，及区域半径函数 mPin\-I  
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） a1SOC=.M
;  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 f9UaAdJ(  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single )V3(nZY  
   cax = x2 - x1 cl{W]4*$  
   cay = y2 - y1 k!=GNRRZE  
   cbx = x2 - x3 lmK
q xs4  
   cby = y2 - y3 L59oh  
   mo_jj = cax * cbx + cay * cby =zeLs0s;  
   mo_ca = Sqr(cax * cax + cay * cay) SRN9(LN  
   mo_cb = Sqr(cbx * cbx + cby * cby) `?^w  
   cos_acb = mo_jj / (mo_ca * mo_cb) DXW?;|8)O  
   'ff_cos = cos_acb >
x ghq  
   If cos_acb >= 1 Then e[mhbFf-  
   nn = 0 Q5nyD/k4c  
   ElseIf cos_acb <= -1 Then o?K|[gNi  
   nn = 3.14159265258979 O6,"#BX  
   Else n/oipiYx  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) =veOVv[Q&/  
   End If >B/&V|E  
   'ff_angle = nn ^FM9} t/U,  
   ff_angle = nn * 180 / 3.14159265258979 ZT"|o\G^
Q  
End Function

'判断点在区域内函数 o1X/<.0+  
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 x*&&?nV Iz  
Dim aob, boc, cod, doa, sum As Single ?ey&Un"  
  If ppx = p1x And ppy = p1y Then O%K?l}e  
     point_in = True ccn
`f]5w  
     Exit Function +GYMJK`S+  
  End If \As oeeF  
  If ppx = p2x And ppy = p2y Then )n}]]^Sc  
     point_in = True ^UvK~5tBV  
     Exit Function 6"Lsui??  
  End If qN1 -plY  
   If ppx = p3x And ppy = p3y Then {8#N7(%z  
     point_in = True $;
2eH  
     Exit Function ))IgB).3M  
  End If =F
%wlzF:  
     Qw<kX*fxrI  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) X}j'L&{F@  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) }.M
oDR3\  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) adO!Gs9f?  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 9IvcKzS2  
    sum = aob + boc + cod + doa =EcIXDzC>  
    If 360.01 > sum And sum > 359.99 Then qBBYckS.  
       point_in = True W?^8/1U  
    Else ]~\SR0  
       point_in = False pcuMGo-#  
    End If %<w
Q  
End Function

'得到点半径,得到交点坐标函数 m
0
I #  
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() 3{Ek-{9  
    '求得中心点坐标 R(2HYZ  
Dim tt As String e7XsyL'
|p  
Dim rt(3) As Single GP{$v:RG  
    '判断是否平行 PTzp;.  
   acx = p3x - p1x z;bH<cQ  
   acy = p3y - p1y ~mXZfG/D  
   bdx = p4x - p2x Sv7>IVC?@  
   bdy = p4y - p2y (>rS _#^  
   If acx * bdy = acy * bdx Then @ate49W  
      rt(0) = 0 2vqmsl?  
      Exit Function $Yx6#m}[M  
   Else 7>PF~=  
      '判断斜率存在否 1Lm].tq  
      If p1x = p3x And p2x <> p4x Then Y7*(_P3/  
         tt = "ac_n_bd_y" $[
M}K  
      ElseIf p1x <> p3x And p2x = p4x Then NJ|NJp&0  
         tt = "ac_y_bd_n" sR"zRn  
      ElseIf p1x <> p3x And p2x <> p4x Then 85r)>aCMn  
         tt = "ac_y_bd_y" 943I:, B  
      End If CB*`  
    Select Case tt /S7+B]  
         Case "ac_n_bd_y" [cGt  
            'bd线段方程 ~K5Cr  
            k_bd = bdy / bdx vp\PYg;x  
            b_bd = p2y - k_bd * p2x *[d~Nk%Y$  
            p_x = p1x F=oHl@  
            p_y = k_bd * p_x + b_bd .k# N7[q=  
         Case "ac_y_bd_n" nB cp7e  
            'ac线段方程 2 ) TG  
            k_ac = acy / acx o &BPG@n  
            b_ac = p1y - k_ac * p1x "n{9- VEmN  
            p_x = p2x YPF&U4CN  
            p_y = k_ac * p_x + b_ac x @1px&^  
        Case "ac_y_bd_y" +M44XhT  
           'ac，bd线段都要求 KY4d+~2  
           k_ac = acy / acx y#]}5gJ  
           b_ac = p1y - k_ac * p1x gB(9vhj$  
           k_bd = bdy / bdx R&6n?g6@/V  
           b_bd = p2y - k_bd * p2x |7rR99  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) p>k]C:h  
           p_y = k_ac * p_x + b_ac =ud`6{R  
        End Select \e?.hmq  
      rt(1) = p_x OOCQsoN
  
      rt(2) = p_y n_<mPU  
     -L@]I$Yo  
'计算最大半径 d32@M~vD  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 90Xt_$_}s  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) ]UK`?J=t2g  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) h6g=$8E  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) Q/9a,85  
Dim bb(5) As Single 60`+9(^  
  bb(1) = rr1 $GQphXb$  
  bb(2) = rr2 ;LHDh_.pX  
  bb(3) = rr3 ?V#Gx>\  
  bb(4) = rr4 iPMB$SdfO  
  nb = rr1 M6# \na  
For i = 1 To 4 {UP'tXah  
    If nb <= bb(i) Then zLh Fbyn(  
       nb = bb(i) m])Lw@#9W  
    End If Xa4GqV9M/-  
Next i s>T`l  
    rt(0) = Sqr(nb) 2bWUa~%B  
    rr = rt() 3f_i1|>)'  
  End If ]}'^`  
         ,,S9$@R  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  <raG07{!*  

;R!*I%  
有热压工艺方面的人才或者资料分享下； 5U
~OP  
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 U@?6*,b(.  

高手真多！

楼主威武霸气.