[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： lxbC 7?O
 
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关键点说几个： WX`wz>KK^  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） <Wj/A/  
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 wr(*RI"  
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 0,):;OI  

以下是几个重要的函数： ^vzXT>t-M  
1.判断点在区域中函数 U[q39FR  
2.计算夹角函数 (y\.uPu!  
3.转置函数 )(1tDQ`L>  
4.得到区域中心点，及区域半径函数 &$#NV@  
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） }s#4m  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 a", 8N"'  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single D6\k}4n-  
   cax = x2 - x1 &##JZ  
   cay = y2 - y1 9/R=_y-  
   cbx = x2 - x3 Qi9M4Yv  
   cby = y2 - y3 N]|)O]/[  
   mo_jj = cax * cbx + cay * cby 'X_%m~}N  
   mo_ca = Sqr(cax * cax + cay * cay) Go~3L8 '  
   mo_cb = Sqr(cbx * cbx + cby * cby) =#%Vs>G  
   cos_acb = mo_jj / (mo_ca * mo_cb) q _:7uQ  
   'ff_cos = cos_acb 6Q*zZ]kg  
   If cos_acb >= 1 Then gA2]kZg  
   nn = 0 'm/`= QX  
   ElseIf cos_acb <= -1 Then ),-MrL8c%  
   nn = 3.14159265258979 "T>;wyGW  
   Else P Qi=  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) `2HNQiK'@  
   End If <sjz_::V8R  
   'ff_angle = nn sB'~=1m^  
   ff_angle = nn * 180 / 3.14159265258979 @4]
dv> Z  
End Function

'判断点在区域内函数 kAAD&t;w  
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 cN]g^  
Dim aob, boc, cod, doa, sum As Single f;,^ ]mw  
  If ppx = p1x And ppy = p1y Then "J%dI9tM{  
     point_in = True zj#8@gbh+  
     Exit Function V<t!gT#&o!  
  End If p9*Ak U&]  
  If ppx = p2x And ppy = p2y Then ?
&@a{-  
     point_in = True [d6
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     Exit Function A04E <nr  
  End If HP[M"u  
   If ppx = p3x And ppy = p3y Then 7[YulC-pH  
     point_in = True w\5;;9_#  
     Exit Function _4X3g%nXl  
  End If !u=A9i!  
     /jd.<r=_I  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 42.y.LtZ  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) Rj])c^ZA'*  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) f9?f!k  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) k\}\>&Zqu  
    sum = aob + boc + cod + doa eq7>-Dmi@  
    If 360.01 > sum And sum > 359.99 Then >~rytg]f  
       point_in = True q#P@,|nc:  
    Else Ydh+iLjhx  
       point_in = False unAu8k^  
    End If y"Jma`Vjq  
End Function

'得到点半径,得到交点坐标函数 cxn*!TwDs  
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() !A&>Eeai  
    '求得中心点坐标 XywsjeI4  
Dim tt As String V D.T=(  
Dim rt(3) As Single @Avve8S  
    '判断是否平行 @agxu-Y  
   acx = p3x - p1x +9R@cUr  
   acy = p3y - p1y (Kb_/  
   bdx = p4x - p2x $`6Q\=*R/  
   bdy = p4y - p2y aP/Ff%5T  
   If acx * bdy = acy * bdx Then 6QG"~>v7'(  
      rt(0) = 0 F8d:7`lO@/  
      Exit Function W|AK"vf  
   Else *`~]XM@H  
      '判断斜率存在否 eizni\  
      If p1x = p3x And p2x <> p4x Then Fu[<zA^  
         tt = "ac_n_bd_y" r!y3VmJ'm  
      ElseIf p1x <> p3x And p2x = p4x Then )h`8</#m{  
         tt = "ac_y_bd_n" f yhBfA:u  
      ElseIf p1x <> p3x And p2x <> p4x Then uXo?  
         tt = "ac_y_bd_y" jkV9$W0  
      End If _o'a|=Osx>  
    Select Case tt .njk^,N  
         Case "ac_n_bd_y" ,C}s8|@k  
            'bd线段方程 \"1%>O*  
            k_bd = bdy / bdx A&
D<}y/%  
            b_bd = p2y - k_bd * p2x l-?#oy  
            p_x = p1x G|.6%-  
            p_y = k_bd * p_x + b_bd !v<`^`x9I  
         Case "ac_y_bd_n" ob]j1gYb  
            'ac线段方程 vC!B}~RG  
            k_ac = acy / acx ErxvGB
(2  
            b_ac = p1y - k_ac * p1x !4+ FN)  
            p_x = p2x L'u*WHj|v  
            p_y = k_ac * p_x + b_ac 7\[)5j  
        Case "ac_y_bd_y" Nj=0bg"Qg5  
           'ac，bd线段都要求 *>E_lWW.  
           k_ac = acy / acx lx:.9>  
           b_ac = p1y - k_ac * p1x :pvB}RYD  
           k_bd = bdy / bdx aY0{vX  
           b_bd = p2y - k_bd * p2x ?10L *PD@  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) !3`X Gg  
           p_y = k_ac * p_x + b_ac $;Z0CG  
        End Select </!GU*  
      rt(1) = p_x m\G
45%m  
      rt(2) = p_y PFjh]/=  
     m ;yIFO  
'计算最大半径 17#t7Yk  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) Vp&"[rC_z  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) Y2[ik<  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) mC} b>\  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) kK=f@
l  
Dim bb(5) As Single GD%qrK?  
  bb(1) = rr1 iL
Q;`/j  
  bb(2) = rr2 VUC_|=?dL  
  bb(3) = rr3 X 4\V4_  
  bb(4) = rr4 cCs@[D#O1  
  nb = rr1 ndu$N$7+  
For i = 1 To 4 `=%G&_3_<  
    If nb <= bb(i) Then pZKK7
  
       nb = bb(i) (t5vBUj  
    End If Z-3("%_$/  
Next i V/tl-;W  
    rt(0) = Sqr(nb) iUq_vQ@}}  
    rr = rt() ET(/h/r  
  End If 5xQ5)B4k  
         5w5"rcV  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  j?g#8L;W\w  

w,_LC)9  
有热压工艺方面的人才或者资料分享下； }:QoYNq  
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 T0.sL9  

高手真多！

楼主威武霸气.