[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： DB(!*6#?  
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关键点说几个： E] rBq_S  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） Ey%KbvNv  
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\&g;n8jA  
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 +[}<u--  

以下是几个重要的函数： r1 b"ta  
1.判断点在区域中函数 wF3 MzN=%  
2.计算夹角函数 H
p@Q  
3.转置函数 x"r,l/gzy  
4.得到区域中心点，及区域半径函数 3-'3w,  
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） MjWxfW/  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 nLCaik_,m  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single Pm,.[5uc  
   cax = x2 - x1 E^$8nqCL:  
   cay = y2 - y1 *eX/ZCn  
   cbx = x2 - x3 7O:g;UI#  
   cby = y2 - y3 wJ7^)tTRF  
   mo_jj = cax * cbx + cay * cby u:mndTpB6x  
   mo_ca = Sqr(cax * cax + cay * cay) 4c[/%e:\-  
   mo_cb = Sqr(cbx * cbx + cby * cby) K)5j  
   cos_acb = mo_jj / (mo_ca * mo_cb) Sp*4Z`^je  
   'ff_cos = cos_acb 9M5W4&  
   If cos_acb >= 1 Then Qqx!'
fft  
   nn = 0 )@P*F)g~  
   ElseIf cos_acb <= -1 Then bwj{5-FU  
   nn = 3.14159265258979 sG)aw`_j  
   Else /0$fYrg>J  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) {&UA60~6  
   End If _,IjB/PR(  
   'ff_angle = nn -y{(h%6  
   ff_angle = nn * 180 / 3.14159265258979 o\]U;#YD  
End Function

'判断点在区域内函数 \P")Eh =d  
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]0EE}%  
Dim aob, boc, cod, doa, sum As Single 6q>}M  
  If ppx = p1x And ppy = p1y Then j>B*8*Ss  
     point_in = True 1U/RMN3`  
     Exit Function j/fniyJ)  
  End If u&^KrOM@#  
  If ppx = p2x And ppy = p2y Then a2tEp+7?  
     point_in = True ^i_+ugJX  
     Exit Function |cgjn*a?M  
  End If K&Bbjb_|  
   If ppx = p3x And ppy = p3y Then Y;%LwDC  
     point_in = True wDGb h=  
     Exit Function gPT_}#_GxM  
  End If =&,T@5&-=  
     NkO+)=  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 6@t&  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) I:G8
B5{J  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) '4<o&b^yQ  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) k sXQ}BE  
    sum = aob + boc + cod + doa euVDrJ^  
    If 360.01 > sum And sum > 359.99 Then =y_KL
  
       point_in = True ,[zSz8R  
    Else q?dd5JzZy,  
       point_in = False 8V 4e\q  
    End If /e|Lw4$@S  
End Function

'得到点半径,得到交点坐标函数 BDvkY  
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() `Wg"m~l$N  
    '求得中心点坐标 wjwCs`  
Dim tt As String D 5n\h5  
Dim rt(3) As Single 1W{oj  
    '判断是否平行 &K[sb%  
   acx = p3x - p1x boGdZ2$h4  
   acy = p3y - p1y a1y<Y`SC9  
   bdx = p4x - p2x kSzap+nB?  
   bdy = p4y - p2y Sx'oa$J  
   If acx * bdy = acy * bdx Then _<#92v!F  
      rt(0) = 0 vj%"x/TP  
      Exit Function _ia&|#n  
   Else ~`FRU/@r  
      '判断斜率存在否 @Kz,TP!%A  
      If p1x = p3x And p2x <> p4x Then @n?"*B  
         tt = "ac_n_bd_y" ch]Q
z[d  
      ElseIf p1x <> p3x And p2x = p4x Then yuBRYy#E|%  
         tt = "ac_y_bd_n" ))f@9m  
      ElseIf p1x <> p3x And p2x <> p4x Then =VzJ>!0  
         tt = "ac_y_bd_y" G=|?aK{p  
      End If 4@3\Ihv  
    Select Case tt '`2'<^yO  
         Case "ac_n_bd_y" i/+^C($'f  
            'bd线段方程 :?\29j#*V  
            k_bd = bdy / bdx py:L-5  
            b_bd = p2y - k_bd * p2x .1RQ}Ro,<  
            p_x = p1x q"<=^vi  
            p_y = k_bd * p_x + b_bd CLzF84@W=  
         Case "ac_y_bd_n" jmwN1Se>  
            'ac线段方程 SoM,o]s#y  
            k_ac = acy / acx O}zHkcL  
            b_ac = p1y - k_ac * p1x j0}wv
~\  
            p_x = p2x i@nRZ$K  
            p_y = k_ac * p_x + b_ac UTh2?Rh/  
        Case "ac_y_bd_y" wg%Z  
           'ac，bd线段都要求 bWp:!w#K  
           k_ac = acy / acx f?tU5EX  
           b_ac = p1y - k_ac * p1x nt$PA(Y  
           k_bd = bdy / bdx >IrQhSF  
           b_bd = p2y - k_bd * p2x Es7 c2YdU  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) GqL&hbpi  
           p_y = k_ac * p_x + b_ac >W] Wc4\  
        End Select ~6kF`}5  
      rt(1) = p_x e8("G[P>  
      rt(2) = p_y pLCj"D).M  
     H!]&
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'计算最大半径 lwX9:[Z  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) STjb2t,a  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) !7I07~&1  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) "zJxWXI  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 8%m\J:eR  
Dim bb(5) As Single aUZ?Ue9l>2  
  bb(1) = rr1 ,+`r2}N \/  
  bb(2) = rr2 xIm2t~i
o  
  bb(3) = rr3 D
b|JR  
  bb(4) = rr4 |
Jd8ul:&e  
  nb = rr1 i /[{xRXiR  
For i = 1 To 4 i*N2@Z[  
    If nb <= bb(i) Then 'uL$j
=vB  
       nb = bb(i) @
NA+Ma{N  
    End If |e@1@q(a[]  
Next i ,dQ*0XO!  
    rt(0) = Sqr(nb) }C_g;7*  
    rr = rt() E*5aLT5!,  
  End If 8Pa*d/5Y(  
         ^2$b8]q  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  wGs'qL"z  

/z!y[ri+J  
有热压工艺方面的人才或者资料分享下； -XnIDXM  
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 7fWZ/;p  

高手真多！

楼主威武霸气.