[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： U\z+{]<<  
=@f;s<v/  

描述:请输入描述

图片:2.jpg

rY
qvG  

关键点说几个： dd+).*  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 5%$#3LT|  
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 ^eRuj)$5A  
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 Xz@>sY>Jc  

以下是几个重要的函数： SOL=3hfb^  
1.判断点在区域中函数 U{Z>y?V/  
2.计算夹角函数 +*q@=P,  
3.转置函数 on\\;V_/Q  
4.得到区域中心点，及区域半径函数 2 *$n?  
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） 5dk,!Cjg  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 F?kVW[h?q  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single h~p}08  
   cax = x2 - x1 ?s]`G'=>V`  
   cay = y2 - y1 4/?Zp4g  
   cbx = x2 - x3 C.-a:oQ[  
   cby = y2 - y3 KF)i66  
   mo_jj = cax * cbx + cay * cby v2{s2kB=  
   mo_ca = Sqr(cax * cax + cay * cay) ;>9pJ72r  
   mo_cb = Sqr(cbx * cbx + cby * cby) :N}KScS|Wa  
   cos_acb = mo_jj / (mo_ca * mo_cb) mtHz6+  
   'ff_cos = cos_acb ~~,<+X:  
   If cos_acb >= 1 Then )[*O^bPowI  
   nn = 0 k Dt)S$N4n  
   ElseIf cos_acb <= -1 Then
ex458^N_  
   nn = 3.14159265258979 }q W aE  
   Else beE%%C]X  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1)  /GUuu  
   End If wlM ?gQXU[  
   'ff_angle = nn 9,CC1f  
   ff_angle = nn * 180 / 3.14159265258979 #+0R!Y  
End Function

'判断点在区域内函数 Ai18]QD-  
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 =osw3"ng  
Dim aob, boc, cod, doa, sum As Single {1|7N GQ  
  If ppx = p1x And ppy = p1y Then T(^8ki  
     point_in = True 5Suc#0y  
     Exit Function (t$/G3E  
  End If :w%bw\}  
  If ppx = p2x And ppy = p2y Then l0if#?4\r  
     point_in = True P'9io!
Z-s  
     Exit Function 98'XSL|  
  End If W%K8HAP"  
   If ppx = p3x And ppy = p3y Then 8T )ELhTj  
     point_in = True %W;Gf9.w  
     Exit Function hP8&n9o  
  End If `+c9m^  
     e~]e9-L>I  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) g8A{aHb1}  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) >[4|6k|\x  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) l>Ja[`X@  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 4^_Au^8R(  
    sum = aob + boc + cod + doa eh4"_t  
    If 360.01 > sum And sum > 359.99 Then WV"QY/e3  
       point_in = True VQMd[/  
    Else .BDRD~kB  
       point_in = False <|Eby!KXR  
    End If k+GnF00N^8  
End Function

'得到点半径,得到交点坐标函数 ,h.Jfo54,  
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() 7C7(bg,7^  
    '求得中心点坐标 @^6OV)  
Dim tt As String (`.qG &6p  
Dim rt(3) As Single X3L[y\  
    '判断是否平行 X8n/XG~_  
   acx = p3x - p1x {^5<{j3e  
   acy = p3y - p1y c0Ro3j\p  
   bdx = p4x - p2x ?WtG|w  
   bdy = p4y - p2y XAxI?y[c
 
   If acx * bdy = acy * bdx Then bW.zxQ:  
      rt(0) = 0 )LrCoI =|  
      Exit Function To{G#QEgG  
   Else K(KP3
Q  
      '判断斜率存在否 EJ;0ypbG  
      If p1x = p3x And p2x <> p4x Then $]U5  
         tt = "ac_n_bd_y" K-k.=6mS  
      ElseIf p1x <> p3x And p2x = p4x Then })Mv9~&S  
         tt = "ac_y_bd_n" 2G}7R5``9  
      ElseIf p1x <> p3x And p2x <> p4x Then AH87UkNL  
         tt = "ac_y_bd_y" Vt)\[Tl~  
      End If +IO1ipc4cE  
    Select Case tt 2T(,H.O  
         Case "ac_n_bd_y" y_4krY|Zx  
            'bd线段方程 QD;f
~fZ  
            k_bd = bdy / bdx 'Kzr-)JS  
            b_bd = p2y - k_bd * p2x Q @OC=  
            p_x = p1x $x_52 j\j  
            p_y = k_bd * p_x + b_bd K9O,7h:x  
         Case "ac_y_bd_n" qwNKRqT  
            'ac线段方程 )C01fZ
hD  
            k_ac = acy / acx KkL:p?@n  
            b_ac = p1y - k_ac * p1x KgTGxCH  
            p_x = p2x h[ZN >T  
            p_y = k_ac * p_x + b_ac IL[|CB1v  
        Case "ac_y_bd_y" OQL09u  
           'ac，bd线段都要求 r{B,uj"  
           k_ac = acy / acx &Wz`>qYL*  
           b_ac = p1y - k_ac * p1x /$Tl#   
           k_bd = bdy / bdx Q#ZD&RZ9.  
           b_bd = p2y - k_bd * p2x q>|[JJ*6_N  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) +65~,e  
           p_y = k_ac * p_x + b_ac 1S[5#ewB;j  
        End Select L^ #<HQ  
      rt(1) = p_x 51ajE2+X&  
      rt(2) = p_y )Rhff$  
     _z(5e  
'计算最大半径 ?y*+^E0  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 'K@{vB  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) ,7fc41O3V  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) e9Ul A  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) q~Q)'*m  
Dim bb(5) As Single DYT -#Ht  
  bb(1) = rr1 I~]Q55  
  bb(2) = rr2 7tfivIj)e  
  bb(3) = rr3 ULNAH`{D  
  bb(4) = rr4 BheEI;}
 
  nb = rr1 [6_Du6\h  
For i = 1 To 4 `J=1&ae{  
    If nb <= bb(i) Then |:e|~sism  
       nb = bb(i) ZH;y>Z  
    End If QLB1:O>  
Next i 16[-3cJ T  
    rt(0) = Sqr(nb) xf^<ec  
    rr = rt() 4QjWZ Wl  
  End If JwI`"$>w  
         3u?`q%Y-e  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  3[0w+{(Q  

SXRdNPXFO  
有热压工艺方面的人才或者资料分享下； ] vC=.&]  
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 NXzU0  

高手真多！

楼主威武霸气.