[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： =XYc2.t  
x+~!M:fAc9  

描述:请输入描述

图片:2.jpg

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关键点说几个： An}RD73!w  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） !m))Yp-"H  
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 Px-VRANZt  
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 k:7Gb7\  

以下是几个重要的函数： u,:hT] ~+  
1.判断点在区域中函数 I%:?f{\  
2.计算夹角函数 _'G'>X>}WU  
3.转置函数 X'\h^\yOo  
4.得到区域中心点，及区域半径函数 sk07|9nU  
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） &=S:I!9;;  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 "uL~D5!f  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single <L*`WO]\l  
   cax = x2 - x1 %t6-wWM97  
   cay = y2 - y1 kf<c[su  
   cbx = x2 - x3 s8's(*]  
   cby = y2 - y3 mA.,.<xE@  
   mo_jj = cax * cbx + cay * cby
WB_BEh[>j  
   mo_ca = Sqr(cax * cax + cay * cay) a-S tOO5s  
   mo_cb = Sqr(cbx * cbx + cby * cby) Vg,nNa3  
   cos_acb = mo_jj / (mo_ca * mo_cb) WC=d@d)M  
   'ff_cos = cos_acb %rhZH^2  
   If cos_acb >= 1 Then f34/whD65  
   nn = 0 }%PK %/ zI  
   ElseIf cos_acb <= -1 Then J,?F+Qji&=  
   nn = 3.14159265258979 WK?5`|1l:x  
   Else #^]vhnbN  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) ->?tB1}^  
   End If g yV>k=B  
   'ff_angle = nn h*40jZ  
   ff_angle = nn * 180 / 3.14159265258979 Gt?l 2s  
End Function

'判断点在区域内函数 <b *sn]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 >W >Ei(f  
Dim aob, boc, cod, doa, sum As Single 'Nt)7U>oC9  
  If ppx = p1x And ppy = p1y Then @.i#uMWF`  
     point_in = True [[^95:  
     Exit Function ;/Z-|+!IJt  
  End If FP=27=  
  If ppx = p2x And ppy = p2y Then ;ltk}hJ]
 
     point_in = True Djc-f  
     Exit Function AIn/v`JeX  
  End If ,m]5j_< }  
   If ppx = p3x And ppy = p3y Then VZr:yE  
     point_in = True =9 )k:S(  
     Exit Function R)*DkL!  
  End If N8Zz6{rp  
     GrJLQO0$N  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) [|c%<|d2  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 6YNL4HE?  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) a,S;JF)v  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) M.s'~S7y  
    sum = aob + boc + cod + doa q!'p   
    If 360.01 > sum And sum > 359.99 Then ihwJBN>(  
       point_in = True 4c(Em+4  
    Else A&Aj!#  
       point_in = False  P33xt~  
    End If P[G>uA>Z1  
End Function

'得到点半径,得到交点坐标函数 EI 35&7(  
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() r#4/~a5i~  
    '求得中心点坐标 UWKgf? _  
Dim tt As String rq8 d}wj  
Dim rt(3) As Single CKK}Z;~:  
    '判断是否平行 _7;:*'>a4  
   acx = p3x - p1x p+V#86(3  
   acy = p3y - p1y '-RacNY  
   bdx = p4x - p2x RhHm[aN  
   bdy = p4y - p2y 7LVG0A2>7  
   If acx * bdy = acy * bdx Then BXYH&2]Q  
      rt(0) = 0 HVHv,:bPo  
      Exit Function (VjU,'h  
   Else _;;Zz&c  
      '判断斜率存在否 i}DS+~8v  
      If p1x = p3x And p2x <> p4x Then 9ET1Er{4  
         tt = "ac_n_bd_y" ,oA<xP-*  
      ElseIf p1x <> p3x And p2x = p4x Then 'v V7@@  
         tt = "ac_y_bd_n" b@;Wh-{d  
      ElseIf p1x <> p3x And p2x <> p4x Then W~ET/h  
         tt = "ac_y_bd_y" [MFnS",7c  
      End If ,.W7Z~z  
    Select Case tt I8 :e`L  
         Case "ac_n_bd_y" ^HJ?k:u  
            'bd线段方程 =zyA~}M2  
            k_bd = bdy / bdx |M?vFF]TN  
            b_bd = p2y - k_bd * p2x ;cI*"-I:F  
            p_x = p1x Df^F)\7!N?  
            p_y = k_bd * p_x + b_bd ~bhS$*t64  
         Case "ac_y_bd_n" *$<W"@%^J  
            'ac线段方程 @9B*V~ <  
            k_ac = acy / acx ?FAI@
4  
            b_ac = p1y - k_ac * p1x erUYR"  
            p_x = p2x \uJRjw+  
            p_y = k_ac * p_x + b_ac kJ_8|  
        Case "ac_y_bd_y" rKrHd  
           'ac，bd线段都要求 PVo7Sy!'H  
           k_ac = acy / acx K@O^\  
           b_ac = p1y - k_ac * p1x =+!l8o&o,  
           k_bd = bdy / bdx Z]]Ur  
           b_bd = p2y - k_bd * p2x 4D0jt$==  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) ;v:(  
           p_y = k_ac * p_x + b_ac IA@>'O  
        End Select tR|dnC4U  
      rt(1) = p_x Ku75YFO,5  
      rt(2) = p_y /D&&7;jJ  
     sCFxn  
'计算最大半径 r0XEB,}  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) =:^aBN#  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) e|\xFV=4  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) kyJbV[o<#  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) %tyo(HZQ  
Dim bb(5) As Single /kbU<  
  bb(1) = rr1 -!j6&  
  bb(2) = rr2 i41~-?Bc  
  bb(3) = rr3 7 $e6H|j@  
  bb(4) = rr4 G.rz6o;  
  nb = rr1 ^viabkf C  
For i = 1 To 4 mn/)_1'
,  
    If nb <= bb(i) Then cq4~(PXTg  
       nb = bb(i) VVas>/0qr  
    End If SO$Af!S:bB  
Next i <+QQiFj  
    rt(0) = Sqr(nb) ]4l2jY  
    rr = rt() 8W\yM;'  
  End If hx:q@[ +J/  
         }Kp!,  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  1oQw)X  

%*R, ceuI  
有热压工艺方面的人才或者资料分享下； Q:A#4Z  
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 y]db]pP5  

高手真多！

楼主威武霸气.