[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： 59V8cO+qH  
MI`<U:-lP  
zXe]P(p<  

关键点说几个： w(Q{;RNM;  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 1WI^RlWd(  
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 _iu^VK,}  
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 -r[O_[g w  

以下是几个重要的函数： WKq{g+a  
1.判断点在区域中函数 BD M
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2.计算夹角函数 :T#f&|Gg;  
3.转置函数 #_:%Yd  
4.得到区域中心点，及区域半径函数 Yr>7c1FZi  
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） ra1_XR}  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 _F2ofB'  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single z#d*Odc  
   cax = x2 - x1 *^ua2s.  
   cay = y2 - y1 #eKH'fE  
   cbx = x2 - x3 UDlM?r:f  
   cby = y2 - y3 c+ aTO"  
   mo_jj = cax * cbx + cay * cby  bDq<]h_7  
   mo_ca = Sqr(cax * cax + cay * cay) perhR!#J  
   mo_cb = Sqr(cbx * cbx + cby * cby) pzT`.#N:M  
   cos_acb = mo_jj / (mo_ca * mo_cb) L^Fb;sJYI  
   'ff_cos = cos_acb :
bqUA(k  
   If cos_acb >= 1 Then RvyCc!d  
   nn = 0 z
7&m,:M  
   ElseIf cos_acb <= -1 Then ^g"%:4zO  
   nn = 3.14159265258979 X:QRy9]  
   Else }eSrJgF4M  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) )c<[@::i  
   End If ((6?b5[  
   'ff_angle = nn  *1*i5c  
   ff_angle = nn * 180 / 3.14159265258979 3.h0  
End Function

'判断点在区域内函数 !j9(%,PR  
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 lN*"?%<
x>  
Dim aob, boc, cod, doa, sum As Single .+5;AtN  
  If ppx = p1x And ppy = p1y Then {]O.?Yru?  
     point_in = True 8(* ze+8  
     Exit Function tQ)l4Y 8  
  End If Eg1|Kg\&  
  If ppx = p2x And ppy = p2y Then b:$q5  
     point_in = True r>t|.=!  
     Exit Function e
_3B\59k  
  End If J>fq5  
   If ppx = p3x And ppy = p3y Then a@!O}f*  
     point_in = True dlMjy$/
T  
     Exit Function )+f"J$ah  
  End If Cjj(v7[E  
     1/A|$t[  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) Q!h+1fb  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) lN_b&92  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) _Bh
d@S!  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 5oo6d4[  
    sum = aob + boc + cod + doa fbkAu  
    If 360.01 > sum And sum > 359.99 Then )#,a'~w  
       point_in = True f+2mX"Z[F  
    Else ~l*[=0}  
       point_in = False [o.#$(   
    End If Z
.N9e  
End Function

'得到点半径,得到交点坐标函数 /km0[M  
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() ZC)m&V1  
    '求得中心点坐标 |Rb8/WX  
Dim tt As String aQV?}  
Dim rt(3) As Single TrBtTqH)  
    '判断是否平行 |j4;XaG)  
   acx = p3x - p1x cK'}+  
   acy = p3y - p1y R%Xz3Z&|  
   bdx = p4x - p2x o>I,$=  
   bdy = p4y - p2y }jYVB|2  
   If acx * bdy = acy * bdx Then x'V:qv*O  
      rt(0) = 0 Jv~^hN2  
      Exit Function >FL%H=]  
   Else !)FKF7'  
      '判断斜率存在否 2D"aAI<P  
      If p1x = p3x And p2x <> p4x Then ilQt`-O!  
         tt = "ac_n_bd_y" /Y| <0tq  
      ElseIf p1x <> p3x And p2x = p4x Then 7M$cIWe$
 
         tt = "ac_y_bd_n" >&Vz/0  
      ElseIf p1x <> p3x And p2x <> p4x Then D*ZswHT{y  
         tt = "ac_y_bd_y" yRt7&,}zL  
      End If )yS8(F0  
    Select Case tt `=2p6<#z  
         Case "ac_n_bd_y" 3/8<dc  
            'bd线段方程 _hEr,IX=J  
            k_bd = bdy / bdx {G{>Qa|  
            b_bd = p2y - k_bd * p2x }zrapL"9X  
            p_x = p1x 4C9k0]k2  
            p_y = k_bd * p_x + b_bd _Pn 1n  
         Case "ac_y_bd_n" U
Fyk%#L  
            'ac线段方程 M/YS%1  
            k_ac = acy / acx Kae-Y  
            b_ac = p1y - k_ac * p1x =lx~tSiS  
            p_x = p2x <6C:\{eo  
            p_y = k_ac * p_x + b_ac )&ucX  
        Case "ac_y_bd_y" {6>$w/+~  
           'ac，bd线段都要求 ;+lsNf  
           k_ac = acy / acx /$|-!e<5b\  
           b_ac = p1y - k_ac * p1x ~g*5."-i  
           k_bd = bdy / bdx Nu+DVIM  
           b_bd = p2y - k_bd * p2x eCG{KCM~_Z  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) Sp[]vm8N  
           p_y = k_ac * p_x + b_ac 0+KSD{  
        End Select $rPQ%2eF4  
      rt(1) = p_x  Rp6q)  
      rt(2) = p_y h79~d%-  
     )oZ2,]us!  
'计算最大半径 i>(TPj|  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) cuL/y$+EY  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) 6ck%M#v  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) dyB@qh~H  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) J@qLBe(v  
Dim bb(5) As Single ~gg&G~ET  
  bb(1) = rr1 =0SJf 3  
  bb(2) = rr2 Nf}i/  
  bb(3) = rr3 Nr`v|_U  
  bb(4) = rr4 Us% _'}(/U  
  nb = rr1 Op hD_^  
For i = 1 To 4 sk@aOv'*(  
    If nb <= bb(i) Then Asj<u!L  
       nb = bb(i) \!IEZ  
    End If o 80x@ &A:  
Next i -0<ZN(?|  
    rt(0) = Sqr(nb) xsU3c0wbr8  
    rr = rt() N3wy][bo  
  End If x\YVB',h  
         ^grDP*;W  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  B&}lYo  

rEs!gGNN  
有热压工艺方面的人才或者资料分享下； t`1~5#?Du(  
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 z0T6a15f!P  

高手真多！

楼主威武霸气.