[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： yOCcp+`T}  
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关键点说几个： NVh>Q>B$_  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） _(s|Q  
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 lo;9sTUHT  
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 E?5B>Jer#  

以下是几个重要的函数： %Bun@  
1.判断点在区域中函数 iW%0pLn  
2.计算夹角函数 +q?0A^C>  
3.转置函数 ^WYG?/{4  
4.得到区域中心点，及区域半径函数 v@1Jhns  
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） .?)oiPW#  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 3T^dgWXEG  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single :v ~q  
   cax = x2 - x1 pY5HW2TsY|  
   cay = y2 - y1 C^v-&*v  
   cbx = x2 - x3 oa|*-nw  
   cby = y2 - y3 EF{'J8AQ  
   mo_jj = cax * cbx + cay * cby h/~BUg'  
   mo_ca = Sqr(cax * cax + cay * cay) 8pt<)Rs}  
   mo_cb = Sqr(cbx * cbx + cby * cby) dllf~:b  
   cos_acb = mo_jj / (mo_ca * mo_cb) qCT\rZU  
   'ff_cos = cos_acb }n8;A;axi  
   If cos_acb >= 1 Then dV*rnpN  
   nn = 0 2G> ]W?>  
   ElseIf cos_acb <= -1 Then 9rc n*sm  
   nn = 3.14159265258979 D??/=`|8  
   Else QRa6*AYm  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) rZ4<*Zegv  
   End If ]KT,s].  
   'ff_angle = nn ]Y! Vyn  
   ff_angle = nn * 180 / 3.14159265258979 ai9,4  
End Function

'判断点在区域内函数 eZ$1|Sj]j  
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 Bq`kVfx  
Dim aob, boc, cod, doa, sum As Single Jtk(yp{Zz  
  If ppx = p1x And ppy = p1y Then Lxrn#Z eM  
     point_in = True =%G[vm/-)  
     Exit Function 'mR+W{r  
  End If $oH,:x?}  
  If ppx = p2x And ppy = p2y Then ogbdt1  
     point_in = True 1yc@q8  
     Exit Function 2a-hf|b1  
  End If
>xgd<  
   If ppx = p3x And ppy = p3y Then z*1K<w8  
     point_in = True T+!kRigN~P  
     Exit Function pSUp"wch  
  End If >Sah\u`  
     C>ZeG Vq  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) @U5>w\  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) ?Qk#;~\yB  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) KHiJOeLc  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) rNp#5[e  
    sum = aob + boc + cod + doa \(L^ /]}G)  
    If 360.01 > sum And sum > 359.99 Then 7^5BnF@  
       point_in = True (P8oXb+%  
    Else *h9vMks o  
       point_in = False ij5YV3  
    End If q>X2=&1  
End Function

'得到点半径,得到交点坐标函数 c-d}E!C:  
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() !f6  
    '求得中心点坐标 <^{:K`  
Dim tt As String gZv<_0N  
Dim rt(3) As Single ;"z>p25=T  
    '判断是否平行 X3yr6J[ ^  
   acx = p3x - p1x B?Skw{&  
   acy = p3y - p1y g!
ww;_  
   bdx = p4x - p2x 1O4"MeF  
   bdy = p4y - p2y 566Qikw2  
   If acx * bdy = acy * bdx Then v'tk:Hm1  
      rt(0) = 0 M5uN1*   
      Exit Function IIkJ"Qg.  
   Else X Rn=;gK%J  
      '判断斜率存在否 ev $eM  
      If p1x = p3x And p2x <> p4x Then Q #gHD  
         tt = "ac_n_bd_y" -s"lW 7N^  
      ElseIf p1x <> p3x And p2x = p4x Then 8vK&d>  
         tt = "ac_y_bd_n" k7*q.20  
      ElseIf p1x <> p3x And p2x <> p4x Then bSfQH4F  
         tt = "ac_y_bd_y" tw66XxE  
      End If k9n93I|Cm  
    Select Case tt R8l9i2  
         Case "ac_n_bd_y" nmr>Aj8[  
            'bd线段方程 Df (6DuW  
            k_bd = bdy / bdx C#>C59  
            b_bd = p2y - k_bd * p2x cht#~d  
            p_x = p1x Q1z04m1_y[  
            p_y = k_bd * p_x + b_bd .E&~]<  
         Case "ac_y_bd_n" 3QpTO,  
            'ac线段方程 V_!i KEU  
            k_ac = acy / acx nP^$p C  
            b_ac = p1y - k_ac * p1x o6 /?WR9  
            p_x = p2x zKNk(/y  
            p_y = k_ac * p_x + b_ac H^G*5EQK  
        Case "ac_y_bd_y" jPfoI-  
           'ac，bd线段都要求 @zbXG_J  
           k_ac = acy / acx
GSp1,E2J  
           b_ac = p1y - k_ac * p1x zlfm})+G  
           k_bd = bdy / bdx !_@%/I6  
           b_bd = p2y - k_bd * p2x (P?
9Jct  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) {/ta1&xyG  
           p_y = k_ac * p_x + b_ac lK-I[i!  
        End Select cc[w%jlA#  
      rt(1) = p_x ]G:xTv8  
      rt(2) = p_y
<mN3:G  
     E'Bt1u  
'计算最大半径 }1V&(#H2  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) Nu'rn*Y_  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) o&]qjFo\m  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) {% P;O ?  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) rfjQx]3pB  
Dim bb(5) As Single S
pgVsz  
  bb(1) = rr1 &kG<LGXP#  
  bb(2) = rr2 6{M.S}.^  
  bb(3) = rr3 B !XT:.+  
  bb(4) = rr4 XL:7$  
  nb = rr1 !duR7a  
For i = 1 To 4 ydt1ED0Q-  
    If nb <= bb(i) Then +~-|( y  
       nb = bb(i) d1-QkW^0y  
    End If P1t5-q  
Next i r$KDNa$/a  
    rt(0) = Sqr(nb) /SiQw7yp%  
    rr = rt() ?CIa)dhu  
  End If S'txY\  
         $Ix^Rm9c  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  %5'6^bT  

X4gs{kx}|  
有热压工艺方面的人才或者资料分享下； P
wf":U)  
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 EsdA%`  

高手真多！

楼主威武霸气.