[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： SwH#=hg  
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图片:2.jpg

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关键点说几个： A^pRHbRq  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） )5U7w
 
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 G7HvA46  
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 p#dYNed]'  

以下是几个重要的函数： xNxSgvco,  
1.判断点在区域中函数 eq36mIo  
2.计算夹角函数  !*-|s}e  
3.转置函数 {X&H  
4.得到区域中心点，及区域半径函数 wb-_CQ  
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） 0a's[>-'A  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 H<wkD9v}H5  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single l>jNBxB|/A  
   cax = x2 - x1 QpMi+q Y  
   cay = y2 - y1 eq$.np  
   cbx = x2 - x3 C.9l${QU  
   cby = y2 - y3 t\\`#gc9~i  
   mo_jj = cax * cbx + cay * cby &qae+p?  
   mo_ca = Sqr(cax * cax + cay * cay) 7,Q>>%/0P  
   mo_cb = Sqr(cbx * cbx + cby * cby) xE
qr3(  
   cos_acb = mo_jj / (mo_ca * mo_cb) 05o 1  
   'ff_cos = cos_acb _air'XQ&!  
   If cos_acb >= 1 Then 2umgF  
   nn = 0 >du|
DZq  
   ElseIf cos_acb <= -1 Then w|8T6W|w  
   nn = 3.14159265258979 4Yya+[RY  
   Else W 33MYw  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) TK
Z[H$Z  
   End If PFPZ]XI%F  
   'ff_angle = nn h_K!ch}  
   ff_angle = nn * 180 / 3.14159265258979 EHX/XM  
End Function

'判断点在区域内函数 &-hXk!A  
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 8XdgtYm  
Dim aob, boc, cod, doa, sum As Single )>U7+ Me  
  If ppx = p1x And ppy = p1y Then Dt=@OZW  
     point_in = True bE>"DPq  
     Exit Function j NkobJ1  
  End If B0|!s  
  If ppx = p2x And ppy = p2y Then b]k9c1x  
     point_in = True nb_$g@03  
     Exit Function g=]VQ;{  
  End If k}FmdaPI'  
   If ppx = p3x And ppy = p3y Then G#nZ%qQ:I  
     point_in = True &Na,D7A:3I  
     Exit Function $b
sD'Io  
  End If 1paLxR5  
     AS'%Md&I  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 0Tq=nYZA  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) \x;`8H  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) T1=T  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) ;Bwg'ThT  
    sum = aob + boc + cod + doa On-zbE  
    If 360.01 > sum And sum > 359.99 Then L(
+
I  
       point_in = True FE,BvNBZ  
    Else z1S p'h$  
       point_in = False ce:p*  
    End If '|^x[8^  
End Function

'得到点半径,得到交点坐标函数 qsWy <yL+  
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() 5yk#(i7C  
    '求得中心点坐标 ez<V  
Dim tt As String Dl@Jj?zc  
Dim rt(3) As Single   D9h  
    '判断是否平行 5.d[C/pRw  
   acx = p3x - p1x %y_{?|+  
   acy = p3y - p1y 5Ky(C6E$s  
   bdx = p4x - p2x T:Nc^QP|tm  
   bdy = p4y - p2y 49.B!DqQW&  
   If acx * bdy = acy * bdx Then LyH1tF  
      rt(0) = 0 @ Fkhida  
      Exit Function pZz\o  
   Else 4-m6e$p;  
      '判断斜率存在否 AVi&cvhs  
      If p1x = p3x And p2x <> p4x Then lF
l(Sww!\  
         tt = "ac_n_bd_y" U0Uy C  
      ElseIf p1x <> p3x And p2x = p4x Then LwYWgT
\e  
         tt = "ac_y_bd_n" ! k 1 Ge+  
      ElseIf p1x <> p3x And p2x <> p4x Then YS:p(jtd  
         tt = "ac_y_bd_y" y9b%P]i  
      End If nF B]#LLv  
    Select Case tt f@[qS7ok  
         Case "ac_n_bd_y" wJj:hA}  
            'bd线段方程 eG7Yyz+t$  
            k_bd = bdy / bdx _\na9T~g  
            b_bd = p2y - k_bd * p2x X,{ 3_  
            p_x = p1x aW-6$=W  
            p_y = k_bd * p_x + b_bd m!5Edo-;<  
         Case "ac_y_bd_n" E!_3?:[S_  
            'ac线段方程 "VDMO^  
            k_ac = acy / acx u'nQC*iJb  
            b_ac = p1y - k_ac * p1x yzT4D>1,  
            p_x = p2x i
X[g  
            p_y = k_ac * p_x + b_ac .,20_<j%=  
        Case "ac_y_bd_y" 5|5p -B  
           'ac，bd线段都要求 IC?(F]$%>  
           k_ac = acy / acx Yt?]0i+  
           b_ac = p1y - k_ac * p1x "9 f
+F  
           k_bd = bdy / bdx *YSRZvD<\  
           b_bd = p2y - k_bd * p2x bQ(-M:  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) 3)yL#hXg)  
           p_y = k_ac * p_x + b_ac `/^ _W <  
        End Select .cbC2t95  
      rt(1) = p_x PD&gC88
  
      rt(2) = p_y sn"z'=ch  
     7Ja*T@ !h  
'计算最大半径 W.NZ%~|+e/  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) }wkY`"  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) FgL892[  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) sM+~x<}0  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) \ 'Va(}v  
Dim bb(5) As Single s&Y"a,|Z  
  bb(1) = rr1 -Caj>K  
  bb(2) = rr2 "F%JZO51  
  bb(3) = rr3 X8">DR&>Y  
  bb(4) = rr4 d$jwh(Ivs  
  nb = rr1 R<U]"4CBx  
For i = 1 To 4 7f4O~4.[i  
    If nb <= bb(i) Then i[@13kr  
       nb = bb(i) P#7=h:.522  
    End If - Z`RKR8C  
Next i UKQ"sC  
    rt(0) = Sqr(nb) Fj(GyPFG  
    rr = rt() ZXGi> E
 
  End If f:-l}Zj  
         bMxK@$G~  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  X#lNS+&='  

.B# .   
有热压工艺方面的人才或者资料分享下； !Qe;oMqy}  
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 ?Gki0^~J  

高手真多！

楼主威武霸气.