[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： ac@\\2srV  
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关键点说几个： >
Q"3dw  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） ~^'t70 :D  
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 ? ][/hL@[  
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 Q (gA:aQ  

以下是几个重要的函数： ~K|ha26W  
1.判断点在区域中函数 V}2[chbl
 
2.计算夹角函数 N 5
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3.转置函数 HKOSS-`5  
4.得到区域中心点，及区域半径函数 x2b t^!t.  
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） MX!N?k#KhP  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 37tJ6R6[  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single mB bGj3u;  
   cax = x2 - x1 J=O_nup6C  
   cay = y2 - y1 G$/Qcr6W<  
   cbx = x2 - x3 mmNn,>AO!  
   cby = y2 - y3 I
>-1kFma;  
   mo_jj = cax * cbx + cay * cby Pum&\.l  
   mo_ca = Sqr(cax * cax + cay * cay) Ts=TaRwWf  
   mo_cb = Sqr(cbx * cbx + cby * cby) fp3`O9+em  
   cos_acb = mo_jj / (mo_ca * mo_cb) pOl6x iMx  
   'ff_cos = cos_acb 7fT_]H8  
   If cos_acb >= 1 Then
(X
2[}K  
   nn = 0 k#V\O2lb  
   ElseIf cos_acb <= -1 Then =XSupM[T  
   nn = 3.14159265258979 @qA11C.hq  
   Else jEP'jib%  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) i{HzY[  
   End If gKWUHlQY  
   'ff_angle = nn Q;m8 drU  
   ff_angle = nn * 180 / 3.14159265258979 ):L0{W{  
End Function

'判断点在区域内函数 mGw*6kOIS  
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 /}d)g4\j  
Dim aob, boc, cod, doa, sum As Single fLkC

|  
  If ppx = p1x And ppy = p1y Then !(j<Y0xo:  
     point_in = True b0N7[M1Xl  
     Exit Function zmFKd5  
  End If ^'b\OUty-  
  If ppx = p2x And ppy = p2y Then j4#S/:Q<7  
     point_in = True ~Hb0)M@y7  
     Exit Function ]<_v;Q<t  
  End If Qgo|\=  
   If ppx = p3x And ppy = p3y Then _2}/rwVg  
     point_in = True Z?eedVV@  
     Exit Function B/JMH 1r  
  End If Y)AHM0;g  
     .&KC2#4  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) Fa X3@Sd!  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) -e+im(2D=  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) 5~i}!n  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) ECuNkmUI  
    sum = aob + boc + cod + doa _Vt CC
/  
    If 360.01 > sum And sum > 359.99 Then A_.}-dzF  
       point_in = True =cx_3gCr{  
    Else 5J6~]J  
       point_in = False T&E'MB  
    End If r!p:73L8  
End Function

'得到点半径,得到交点坐标函数 6k ]+DbT  
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() 9%?a\#C  
    '求得中心点坐标 DC'L-]#<  
Dim tt As String e1R<+`]  
Dim rt(3) As Single Okd7ua-f  
    '判断是否平行 XK@Ct eP"  
   acx = p3x - p1x G=KXA'R)1.  
   acy = p3y - p1y 42PA?^xPw  
   bdx = p4x - p2x }I~)o!N%7  
   bdy = p4y - p2y ?T>)7Y)  
   If acx * bdy = acy * bdx Then 8+&Da  
      rt(0) = 0 U1=\ `)u;  
      Exit Function /t _QA  
   Else VO,F[E~_  
      '判断斜率存在否 =n_>7@9l  
      If p1x = p3x And p2x <> p4x Then ?Pt*4NaT;  
         tt = "ac_n_bd_y" AhNz[A  
      ElseIf p1x <> p3x And p2x = p4x Then Lr(My3vF8q  
         tt = "ac_y_bd_n" 1Zgv+
.  
      ElseIf p1x <> p3x And p2x <> p4x Then bxAHzOB(\  
         tt = "ac_y_bd_y" Q
\*zF,ek  
      End If
6LzN#g  
    Select Case tt i[n3ILn  
         Case "ac_n_bd_y" |I=GI]I  
            'bd线段方程 '.t{\  
            k_bd = bdy / bdx +)*oPSQ5  
            b_bd = p2y - k_bd * p2x )1Z @}o 9  
            p_x = p1x 7k#0EhN1>  
            p_y = k_bd * p_x + b_bd zw%1a 3!  
         Case "ac_y_bd_n" ##yH*{/&  
            'ac线段方程 8 v<*xy  
            k_ac = acy / acx -b'/}zz  
            b_ac = p1y - k_ac * p1x >d^DN;p  
            p_x = p2x BBRZlx  
            p_y = k_ac * p_x + b_ac F Xp_`9.zH  
        Case "ac_y_bd_y" /wJocx]vQ  
           'ac，bd线段都要求 ZtOv'nTD  
           k_ac = acy / acx _>Oc>.MB  
           b_ac = p1y - k_ac * p1x NPt3#k^bW  
           k_bd = bdy / bdx M HKnHPv  
           b_bd = p2y - k_bd * p2x )3)f
q:[  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) xZ`h8  
           p_y = k_ac * p_x + b_ac bHioM{S  
        End Select 'TDp%s*;  
      rt(1) = p_x lxtt+R  
      rt(2) = p_y _5v]69C#  
     {:`XhPS<B  
'计算最大半径 KzLkT7,y+  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) vk|xYDD  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) m~8=?R+m  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) 7Q #A  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) a} :2lL%  
Dim bb(5) As Single FLaj|Z~#)  
  bb(1) = rr1 %[k"A  
  bb(2) = rr2 23P7%\  
  bb(3) = rr3 Md>9Daa~  
  bb(4) = rr4 Kq}-)  
  nb = rr1 )W!\D/C+  
For i = 1 To 4 z/f0.RJ  
    If nb <= bb(i) Then *~8g:;u  
       nb = bb(i) N=c{@h  
    End If 7J5Yzu)D  
Next i \kC'y9k  
    rt(0) = Sqr(nb)  lLNI5C  
    rr = rt() 2mfG:^^c  
  End If GT-ONwVDq  
         <ua! ]~  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  A
nQUdU  

*ub"!}$st  
有热压工艺方面的人才或者资料分享下； slV]CXW)t  
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 LEY k  

高手真多！

楼主威武霸气.