[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： yb2*K+Kv  
+[V[{n  

描述:请输入描述

图片:2.jpg

rteViq+|.  

关键点说几个： Sdz!J 1  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） f(=yC}si  
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 12])``9  
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 sTU]ntoQqR  

以下是几个重要的函数： zh2$U dZ|M  
1.判断点在区域中函数 9-eYCg7C|  
2.计算夹角函数 8K*X]Z h  
3.转置函数 h ^g"FSzP  
4.得到区域中心点，及区域半径函数 zL5r8mD3  
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） 4JKB6~Y  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 9E)*X  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single p<?~~7V  
   cax = x2 - x1 l<<0:
~+q  
   cay = y2 - y1 nS"K dPM  
   cbx = x2 - x3 ,*Y*ov23aQ  
   cby = y2 - y3 Nt,)5_K <  
   mo_jj = cax * cbx + cay * cby @/l
{  
   mo_ca = Sqr(cax * cax + cay * cay) k:4 Zc3  
   mo_cb = Sqr(cbx * cbx + cby * cby) MB"uJUk  
   cos_acb = mo_jj / (mo_ca * mo_cb) V^QKn+/  
   'ff_cos = cos_acb J5)e 7  
   If cos_acb >= 1 Then )|@b GEk  
   nn = 0 %/>\`d?  
   ElseIf cos_acb <= -1 Then LO[1xE9  
   nn = 3.14159265258979 yc|C}
oQF  
   Else l " pCxA  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1)  ^ 'FC.  
   End If %E?:9. :NJ  
   'ff_angle = nn 7s;<5xc  
   ff_angle = nn * 180 / 3.14159265258979 m(q6Xe:Vc  
End Function

'判断点在区域内函数 ZLy
J  
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 N#@xo)-H  
Dim aob, boc, cod, doa, sum As Single MG>g?s
'!  
  If ppx = p1x And ppy = p1y Then leiED'  
     point_in = True </t_<I0{  
     Exit Function E$.|h;i]Q  
  End If FH)bE#4  
  If ppx = p2x And ppy = p2y Then kuu9'Sqc'b  
     point_in = True 3:<+9X  
     Exit Function v\rOs+.s  
  End If =x>z|1  
   If ppx = p3x And ppy = p3y Then H.uflO  
     point_in = True c=I!?a"  
     Exit Function *U.$=4Az  
  End If {.bLh0  
     JmrQDO_(  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 8xj4N%PA  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) }U7>_b2  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) S+ymdZ)xZ`  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) -))>7skc  
    sum = aob + boc + cod + doa to[EA6J8l  
    If 360.01 > sum And sum > 359.99 Then !s.G$ JS<  
       point_in = True w
4'(Y,(`  
    Else '97)c7E  
       point_in = False V:6#IL  
    End If >r{3t{  
End Function

'得到点半径,得到交点坐标函数 ZgtW  
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() <%JdQ82?  
    '求得中心点坐标 wC!(STu  
Dim tt As String ]SBv3Q0D7  
Dim rt(3) As Single sa#=#0yg  
    '判断是否平行 9Vzk:zOT  
   acx = p3x - p1x :KgLjhj|)  
   acy = p3y - p1y q]<Xx{_  
   bdx = p4x - p2x XT{1!I(  
   bdy = p4y - p2y 9Lk.\.  
   If acx * bdy = acy * bdx Then "M7ry9dDH  
      rt(0) = 0 )7q;Fm_/  
      Exit Function k:7UU4M 5  
   Else 3, ,Z  
      '判断斜率存在否 IL3,dad'^  
      If p1x = p3x And p2x <> p4x Then .{7?Y;_(  
         tt = "ac_n_bd_y" }w8h^(+B  
      ElseIf p1x <> p3x And p2x = p4x Then j0=`Jf  
         tt = "ac_y_bd_n" +SPC@E_v  
      ElseIf p1x <> p3x And p2x <> p4x Then zq4,%$y8|  
         tt = "ac_y_bd_y" 7*'_&0   
      End If 3tnYK&  
    Select Case tt W}Nd3  
         Case "ac_n_bd_y" &wNN| fH  
            'bd线段方程 Zx}=c4I(y  
            k_bd = bdy / bdx 1Na CGD"  
            b_bd = p2y - k_bd * p2x YH':cze  
            p_x = p1x 4mshB  
            p_y = k_bd * p_x + b_bd kt[#@M!}  
         Case "ac_y_bd_n" F!pUfF,&  
            'ac线段方程 &^9f)xb  
            k_ac = acy / acx l3-KswU  
            b_ac = p1y - k_ac * p1x 3WPMS/  
            p_x = p2x (`3Bi]7  
            p_y = k_ac * p_x + b_ac X?>S24I"9  
        Case "ac_y_bd_y" {nryAXK  
           'ac，bd线段都要求 xd(AUl4qY  
           k_ac = acy / acx v bb mmv  
           b_ac = p1y - k_ac * p1x !!2~lG<]  
           k_bd = bdy / bdx e{=7,DRH<  
           b_bd = p2y - k_bd * p2x 4LBjqv,P  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac)
ywq{9)vq  
           p_y = k_ac * p_x + b_ac `E!t,*(*E  
        End Select )/ s9ty  
      rt(1) = p_x Vy}:Q[  
      rt(2) = p_y g'pE z  
      `Yoafa  
'计算最大半径 ,e.y4 vnU  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) Oq+C<}eg  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) |8+<qgQ  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) 'QCvN b6  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) yc%AkhX*  
Dim bb(5) As Single _ esFx  
  bb(1) = rr1 Aba6/  
  bb(2) = rr2 "ajZ&{Z  
  bb(3) = rr3 #\`6ZHW  
  bb(4) = rr4 Yv"uIj+']  
  nb = rr1 Lb2Bu>  
For i = 1 To 4 Z]9 )1&  
    If nb <= bb(i) Then -|f9~(t  
       nb = bb(i) }
E?s*iP  
    End If (6 0,0|s  
Next i OEB_LI'  
    rt(0) = Sqr(nb) L?al2aopF  
    rr = rt() 4+v~{  
  End If L x9`y t6  
         O~qB  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  RJd55+h  

g{a_{P  
有热压工艺方面的人才或者资料分享下； >TtkG|/U-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 #kV=;(lq  

高手真多！

楼主威武霸气.