[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： *Pm
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图片:2.jpg

TrI+F+;  

关键点说几个： --h\tj\U  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） cILS  
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 "@ >6<(Ki  
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 VL%. maj  

以下是几个重要的函数： #GM^:rF  
1.判断点在区域中函数 n%E,[JT  
2.计算夹角函数 (MGgr  
3.转置函数 <Gpji5f2  
4.得到区域中心点，及区域半径函数 ~J\qkQ  
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） ? AfThJc  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 #j2kT  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single BU -;P  
   cax = x2 - x1 7@@g|l]  
   cay = y2 - y1 ~n=DI/AJ@-  
   cbx = x2 - x3 a1pp=3Pd?~  
   cby = y2 - y3 3IYF
vq~  
   mo_jj = cax * cbx + cay * cby y._'o7%  
   mo_ca = Sqr(cax * cax + cay * cay) .xIAep_  
   mo_cb = Sqr(cbx * cbx + cby * cby) ^ZMbJe%L  
   cos_acb = mo_jj / (mo_ca * mo_cb) !Z_+H<fi+I  
   'ff_cos = cos_acb ('x]@  
   If cos_acb >= 1 Then ]>
M\|,wh  
   nn = 0 ixA.b#!1  
   ElseIf cos_acb <= -1 Then TcZ.5Oe6h#  
   nn = 3.14159265258979 py;p7y!gxA  
   Else tW/k  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) V$ZclV2:Ih  
   End If 8 a]'G)(ts  
   'ff_angle = nn (dlp5:lQz  
   ff_angle = nn * 180 / 3.14159265258979 B[8bkFS>]  
End Function

'判断点在区域内函数 g}MUfl-L  
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 +/[M Ex=   
Dim aob, boc, cod, doa, sum As Single QIiy\E%  
  If ppx = p1x And ppy = p1y Then Y w0,K&  
     point_in = True M\{n+r-m  
     Exit Function "3^tVX%$\[  
  End If )$]lf }  
  If ppx = p2x And ppy = p2y Then uZ6krI  
     point_in = True l
pG%rN!  
     Exit Function #Hrzk!&9  
  End If 1<ag=D`F_"  
   If ppx = p3x And ppy = p3y Then %,bD| NKp  
     point_in = True * zp tbZ  
     Exit Function `XxnQng  
  End If t@!n?j I  
     JmCMFqB9  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) {R_>KE1  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) ;M?)-dpZ  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) :)#;0o5  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) J+/}m}bx  
    sum = aob + boc + cod + doa G(t:s5:  
    If 360.01 > sum And sum > 359.99 Then f\_RW;y|m  
       point_in = True ]s=|+tz\V  
    Else 6:5K?Y
o  
       point_in = False m?kiGC&m  
    End If 4]r_K2.cc  
End Function

'得到点半径,得到交点坐标函数 x^K4&'</  
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() &3SS.&g4W  
    '求得中心点坐标 zA5nr`  
Dim tt As String  Qxz[  
Dim rt(3) As Single 
m
[}P  
    '判断是否平行 -+E.I*st  
   acx = p3x - p1x n%3!)/$  
   acy = p3y - p1y l\Ozy  
   bdx = p4x - p2x g@#he95 }  
   bdy = p4y - p2y ox&5}&\  
   If acx * bdy = acy * bdx Then _=$~l^Y[  
      rt(0) = 0 )M0`dy{1  
      Exit Function jt}Re,  
   Else 4|PWR_x  
      '判断斜率存在否 wlNL;W@w  
      If p1x = p3x And p2x <> p4x Then t/[lA=0 )2  
         tt = "ac_n_bd_y" SrKitSG  
      ElseIf p1x <> p3x And p2x = p4x Then %DSr@IX  
         tt = "ac_y_bd_n" (1z"=NCp  
      ElseIf p1x <> p3x And p2x <> p4x Then eB~\~@  
         tt = "ac_y_bd_y" SRfh{u  
      End If L62'Amml  
    Select Case tt KSs1EmB  
         Case "ac_n_bd_y" V,KIi_Z  
            'bd线段方程 OG}890$n  
            k_bd = bdy / bdx #R5\k-I  
            b_bd = p2y - k_bd * p2x %gmx47  
            p_x = p1x 6Rfv3  
            p_y = k_bd * p_x + b_bd 2 `AdNt,  
         Case "ac_y_bd_n" o(ow{S@=4  
            'ac线段方程 nZioFE}  
            k_ac = acy / acx Onx6Fy]L  
            b_ac = p1y - k_ac * p1x <.)=CK  
            p_x = p2x Fu.aV876\f  
            p_y = k_ac * p_x + b_ac =b%f@x_U1  
        Case "ac_y_bd_y" Owf!dMA;nF  
           'ac，bd线段都要求 THwM',6  
           k_ac = acy / acx TFk
G"ev  
           b_ac = p1y - k_ac * p1x w"0$cL3  
           k_bd = bdy / bdx wKpGJ& {  
           b_bd = p2y - k_bd * p2x Kyh6QA^  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) ,t 2CQ  
           p_y = k_ac * p_x + b_ac P8c_GEna  
        End Select
XEiVs\) G  
      rt(1) = p_x "[ LUv5  
      rt(2) = p_y [6TI_U~  
     tEL;,1  
'计算最大半径 j#f/M3  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 3.YH7rN  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) wwl,F=| Y  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) )FwOg;=3M"  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) SGl|
{+(A  
Dim bb(5) As Single Gxd/t#;  
  bb(1) = rr1 W $D 34(  
  bb(2) = rr2 9SeGkwec?$  
  bb(3) = rr3 .45wwouZkc  
  bb(4) = rr4 p>)1Z<D"a  
  nb = rr1 Mh`^-*c?  
For i = 1 To 4 |6d:k~p  
    If nb <= bb(i) Then ++~ G\T9H  
       nb = bb(i) _j+,'\B  
    End If P{dR pH|  
Next i 8nI~iN?"  
    rt(0) = Sqr(nb) .g/!u(iy  
    rr = rt() @Xoh@:j\  
  End If ^RnQX#+  
         _,^f,W
O~  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  U|h@Pw z  

\v_t: "  
有热压工艺方面的人才或者资料分享下； a-TsD}'X  
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 4d'tK^X  

高手真多！

楼主威武霸气.