[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： pK)!o  
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图片:2.jpg

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关键点说几个： (1%A@4  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） YH&0Vy#c$  
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 H2CpZK'  
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 KqXPxp^_Al  

以下是几个重要的函数： %ejq|i7  
1.判断点在区域中函数 _B
G7JvI  
2.计算夹角函数 )%HIC@MM6  
3.转置函数 H_w?+Rig  
4.得到区域中心点，及区域半径函数 0_-P~^A  
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） VBK|*Tl  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 /b410NP5  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single ~Sx\>wBlc  
   cax = x2 - x1 &a'LOq+r'  
   cay = y2 - y1 </W"e!?X  
   cbx = x2 - x3 c,}VC-  
   cby = y2 - y3 gq~"Z[T  
   mo_jj = cax * cbx + cay * cby 5i%\m  
   mo_ca = Sqr(cax * cax + cay * cay) \Npvm49  
   mo_cb = Sqr(cbx * cbx + cby * cby) TwKi_nh2m  
   cos_acb = mo_jj / (mo_ca * mo_cb) z<8VJZd  
   'ff_cos = cos_acb pMoza8  
   If cos_acb >= 1 Then y8dOx=c  
   nn = 0 @QF;m  
   ElseIf cos_acb <= -1 Then P|TM
4i]  
   nn = 3.14159265258979 X#o;`QM  
   Else P[jh^!<j  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) TNF  
   End If 6Y9<| .  
   'ff_angle = nn hz5t/
E  
   ff_angle = nn * 180 / 3.14159265258979 So4#n7  
End Function

'判断点在区域内函数 olK*uD'`  
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 "+hU
t  
Dim aob, boc, cod, doa, sum As Single !
p_l(@f  
  If ppx = p1x And ppy = p1y Then ^!x qOp!  
     point_in = True ,C|aiSh0-  
     Exit Function f4vdJ5pV  
  End If >2NsBS(  
  If ppx = p2x And ppy = p2y Then 5[~C!t;  
     point_in = True !$<Kp6  
     Exit Function Y]i:$X]C?X  
  End If aj-:JTf  
   If ppx = p3x And ppy = p3y Then c*R18,5-  
     point_in = True <"av 
/`;  
     Exit Function ?F~0\T,7  
  End If &LQfs4}a,  
     rY)m
"'puP  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) &uI33=  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) AOx8OiqE:  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) ".?y!VY  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y)
}xY|z"&  
    sum = aob + boc + cod + doa GqgJ]m  
    If 360.01 > sum And sum > 359.99 Then  !>Q{co'  
       point_in = True 6mjD@  
    Else R9UC0D:-x  
       point_in = False 'lmjZ{k  
    End If 0UQ DB5u  
End Function

'得到点半径,得到交点坐标函数 5"D\n B%  
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() <<H'Z  
    '求得中心点坐标 ~u r}6T  
Dim tt As String fmFs  
Dim rt(3) As Single |xpOU*k  
    '判断是否平行 vb`:  
   acx = p3x - p1x qnO/4\qq  
   acy = p3y - p1y .C1g Dry]  
   bdx = p4x - p2x :kXxxS  
   bdy = p4y - p2y q'jInwY|x  
   If acx * bdy = acy * bdx Then q2M%AvR  
      rt(0) = 0 \]Rmq_O  
      Exit Function B*fBb.Z  
   Else kZ!&3G9>-  
      '判断斜率存在否 E%$[*jZ  
      If p1x = p3x And p2x <> p4x Then <O{G&  
         tt = "ac_n_bd_y" cN)noGkp  
      ElseIf p1x <> p3x And p2x = p4x Then axv-UdE;  
         tt = "ac_y_bd_n" RMAbu*D0  
      ElseIf p1x <> p3x And p2x <> p4x Then y <P1VES  
         tt = "ac_y_bd_y" Ua+Us"M3}  
      End If v&`n}lS  
    Select Case tt
,MD>Jx|  
         Case "ac_n_bd_y" T=fVD8  
            'bd线段方程 +^a@U^V  
            k_bd = bdy / bdx 0:eK}tC  
            b_bd = p2y - k_bd * p2x (KR.dxzjf  
            p_x = p1x Z FIgKWZ'  
            p_y = k_bd * p_x + b_bd C(}Kfi@6N  
         Case "ac_y_bd_n" oSP^ .BJ$  
            'ac线段方程 Qq\hD@Z|  
            k_ac = acy / acx Rz33_ qA  
            b_ac = p1y - k_ac * p1x ~bfjP2 g  
            p_x = p2x kqLpt  
            p_y = k_ac * p_x + b_ac 9A}n
Z1Y  
        Case "ac_y_bd_y" 5~"m$/yE  
           'ac，bd线段都要求 Q>\9/DjUp  
           k_ac = acy / acx r4 ;nkx  
           b_ac = p1y - k_ac * p1x #}8gHI-9%  
           k_bd = bdy / bdx Tg v]30F)  
           b_bd = p2y - k_bd * p2x x%RE3J-  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) Ft8ii|-  
           p_y = k_ac * p_x + b_ac > Cx;h=  
        End Select h'A #Yp0,  
      rt(1) = p_x wodff_l  
      rt(2) = p_y 'zQp64]F  
     a6g+"EcH#'  
'计算最大半径 ae] hCWK  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) u~2
7\oj,  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) $PTl{  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) pbqJtBBDDS  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) UujKgL4  
Dim bb(5) As Single *)i+c{~  
  bb(1) = rr1 C6:; T%  
  bb(2) = rr2 "R-Pe\W  
  bb(3) = rr3 w5mSoKb  
  bb(4) = rr4 k7bfgb{  
  nb = rr1 -)E6{  
For i = 1 To 4 PJ'@!jx  
    If nb <= bb(i) Then yzz(<s:o/  
       nb = bb(i) s=)1:jYk  
    End If |A:+[35  
Next i m[&pR2T  
    rt(0) = Sqr(nb) N#
vV;
 
    rr = rt() .T7S1C $HP  
  End If MT.D#jv&  
         ],Y+|uX->  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  4GTB82V$  

>\c"U1%E  
有热压工艺方面的人才或者资料分享下； ITu5Y"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 %O_Ed {G4t  

高手真多！

楼主威武霸气.