[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： 5tlRrf  
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关键点说几个： ]UvB+M]Lv)  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） huC{SzXM  
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 a
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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 ,clbD4  

以下是几个重要的函数： R:~aX,qR  
1.判断点在区域中函数 \jC
) ;mk  
2.计算夹角函数 /z-rBfdy^  
3.转置函数 j[r}!;O  
4.得到区域中心点，及区域半径函数 d1D f`  
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） 9mi@PW}1  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 ,j%\3g`  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single IO\1nB$0nb  
   cax = x2 - x1 UPfE\KN+p#  
   cay = y2 - y1 E/:U,u{  
   cbx = x2 - x3 5sY
$  
   cby = y2 - y3 2y!n c%  
   mo_jj = cax * cbx + cay * cby u2#q7}  
   mo_ca = Sqr(cax * cax + cay * cay) qR@ESJ_  
   mo_cb = Sqr(cbx * cbx + cby * cby) Dge#e  
   cos_acb = mo_jj / (mo_ca * mo_cb) oywiX@]~7  
   'ff_cos = cos_acb Oa/^A-'Q  
   If cos_acb >= 1 Then XVs]Y'*x  
   nn = 0 t1Ts!Q2  
   ElseIf cos_acb <= -1 Then hCQOwk#  
   nn = 3.14159265258979 6{+yAsI  
   Else [(n5-#1S  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 1clzDwW  
   End If (>}1t!1  
   'ff_angle = nn `:C1Wo^<  
   ff_angle = nn * 180 / 3.14159265258979 {-5)nS^_  
End Function

'判断点在区域内函数 4u5j 7`O  
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 ?i<l7
 
Dim aob, boc, cod, doa, sum As Single >v,X:B?+FL  
  If ppx = p1x And ppy = p1y Then m'2F#{  
     point_in = True 8
O^x~[sQ  
     Exit Function |Y"XxM9  
  End If ?c8~VQaQ  
  If ppx = p2x And ppy = p2y Then ^y>V-R/N  
     point_in = True C@-Hm  
     Exit Function Z.${WZW  
  End If  m}yu4  
   If ppx = p3x And ppy = p3y Then va@;V+cD  
     point_in = True l4RqQ+[KA;  
     Exit Function @JSWqi>  
  End If qK'mF#n0#  
     j"jssbu}  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) ewcFz
lA@  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 0j$=KA  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) ]:f.="  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 4<s;xSCL  
    sum = aob + boc + cod + doa w^L`"  
    If 360.01 > sum And sum > 359.99 Then 2]fTDKh  
       point_in = True 'Ft81e)/  
    Else wQ(DX!   
       point_in = False )nHMXZ>Td  
    End If 7b1 yF,N  
End Function

'得到点半径,得到交点坐标函数 )-+tN>Bb  
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() f.ua,,P.  
    '求得中心点坐标 /;_$:`|/  
Dim tt As String 0of:tZU  
Dim rt(3) As Single bHTf{=  
    '判断是否平行 (l][_6Q  
   acx = p3x - p1x eZ
) |m  
   acy = p3y - p1y LEKE+775  
   bdx = p4x - p2x wPghgjF{  
   bdy = p4y - p2y -)J*(7F(6^  
   If acx * bdy = acy * bdx Then Gad&3M0r  
      rt(0) = 0 ~RLj
L"  
      Exit Function nILUo2e~  
   Else !o'a]8  
      '判断斜率存在否 ++2a xRl  
      If p1x = p3x And p2x <> p4x Then (6[<+j&.  
         tt = "ac_n_bd_y" KXTk.\c  
      ElseIf p1x <> p3x And p2x = p4x Then (QFZM"G  
         tt = "ac_y_bd_n" ^p4`o>  
      ElseIf p1x <> p3x And p2x <> p4x Then 1 =?pL$+G  
         tt = "ac_y_bd_y" (O ;R~Io  
      End If }0R"ZPU1Rw  
    Select Case tt ,9|7{j|u  
         Case "ac_n_bd_y" j; /@A lZl  
            'bd线段方程 QdZHIgh`i  
            k_bd = bdy / bdx 2aivc,m{r  
            b_bd = p2y - k_bd * p2x !OV+2suu1  
            p_x = p1x M|{KQ3q:9  
            p_y = k_bd * p_x + b_bd L%7WHtU*#  
         Case "ac_y_bd_n" [Qkj}  
            'ac线段方程 l7ES*==&@0  
            k_ac = acy / acx E#w2'(t  
            b_ac = p1y - k_ac * p1x 0Q%I[f8  
            p_x = p2x k="wEZ;Q  
            p_y = k_ac * p_x + b_ac }8.$)&O$^  
        Case "ac_y_bd_y" _uh@fRyh  
           'ac，bd线段都要求 ;).QhHeg>  
           k_ac = acy / acx ;XY#Jl>tg  
           b_ac = p1y - k_ac * p1x oz'jt} ?  
           k_bd = bdy / bdx %|}7YH41  
           b_bd = p2y - k_bd * p2x sN
[q.M?  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) N*w{NB7L  
           p_y = k_ac * p_x + b_ac #6AcM"  
        End Select -% B)+yq>  
      rt(1) = p_x .:['&; k  
      rt(2) = p_y @ceL9#:uc  
     ^YPw'cZZ&  
'计算最大半径 c_?!V  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) TAM`i3{D  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) 78z/D|{"  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) ^oHK.x#{  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) +/*A}!#v  
Dim bb(5) As Single Z;U\h2TY  
  bb(1) = rr1 bir tA{q  
  bb(2) = rr2 mnMY)-6C  
  bb(3) = rr3 K0^+2lx  
  bb(4) = rr4 %gEfG#S  
  nb = rr1 am WIA`n=  
For i = 1 To 4 wd:SBU~f5*  
    If nb <= bb(i) Then kZ_5R#xK  
       nb = bb(i) ``?Z97rH  
    End If () HIcu*i  
Next i \U`rF  
    rt(0) = Sqr(nb) a67NWH  
    rr = rt() ~f2-%~  
  End If vw q Y;7  
         47/YDy%  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  /uzU]3KF~  

h>+,ba"D  
有热压工艺方面的人才或者资料分享下； Ytnk^/Z1L  
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 |^i+Srh  

高手真多！

楼主威武霸气.