[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： <s#}`R.#2  
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描述:请输入描述

图片:2.jpg

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关键点说几个： ,?#-1uIGL>  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） n(f&uV_):  
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 ccm <rZ7  
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 WuGm~<NS  

以下是几个重要的函数： zPk
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1.判断点在区域中函数 4GHIRH C%[  
2.计算夹角函数 WAdl@){  
3.转置函数 &1':s|c  
4.得到区域中心点，及区域半径函数 [7s5Vt|  
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） P|(J]/  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 ntkinbbD  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single ~fU
Smc  
   cax = x2 - x1 */+s^{W7  
   cay = y2 - y1 RU>vnDaC  
   cbx = x2 - x3 0F~9t!  
   cby = y2 - y3 {Jy%h8n*  
   mo_jj = cax * cbx + cay * cby O#U
"c5%  
   mo_ca = Sqr(cax * cax + cay * cay) 7Rh:+bT  
   mo_cb = Sqr(cbx * cbx + cby * cby)
h1gb&?w5P  
   cos_acb = mo_jj / (mo_ca * mo_cb) `i:0dVs  
   'ff_cos = cos_acb .6;B3  
   If cos_acb >= 1 Then dDuA%V0  
   nn = 0 T8(wzs  
   ElseIf cos_acb <= -1 Then $tKATL*  
   nn = 3.14159265258979 Zn} )&Xt  
   Else N*MR6~z4  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) jbGH3 L  
   End If g`6wj|@ =W  
   'ff_angle = nn 7w$R-Y/E  
   ff_angle = nn * 180 / 3.14159265258979 c]n03o  
End Function

'判断点在区域内函数 :&-}S>pC  
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 T> 'Vaxo  
Dim aob, boc, cod, doa, sum As Single IjRmpVcwN  
  If ppx = p1x And ppy = p1y Then -Mv
w'#(0  
     point_in = True eC{Z  
     Exit Function y~=hM   
  End If . R}y"O\  
  If ppx = p2x And ppy = p2y Then %Tb|Yfyr C  
     point_in = True 'nS3o.}  
     Exit Function Rqz
()M  
  End If FlG^'UD  
   If ppx = p3x And ppy = p3y Then 4w6K|v<X  
     point_in = True D5b_m|7%  
     Exit Function v`w?QIB]  
  End If NXNon*"  
     15:@pq\  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) S:uEK  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 
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    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) +"
cyOC  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) {wXN kq  
    sum = aob + boc + cod + doa K@~#Gdnl  
    If 360.01 > sum And sum > 359.99 Then EM/+1 _u  
       point_in = True q$rA-`jw  
    Else rM=A"  
       point_in = False K-C,+eI  
    End If PI \,`^)y  
End Function

'得到点半径,得到交点坐标函数 'sBXH EZA]  
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() f1$mh1J W  
    '求得中心点坐标 s)8M? |[`I  
Dim tt As String 97wy;'J[u  
Dim rt(3) As Single +%\j$Pv  
    '判断是否平行 VFSn!o:C  
   acx = p3x - p1x 2\\3<  
   acy = p3y - p1y >#U<#  
   bdx = p4x - p2x *b{lL5  
   bdy = p4y - p2y ]U1,Nh
Zu  
   If acx * bdy = acy * bdx Then mh7sY;SvM  
      rt(0) = 0 W.D3$  
      Exit Function -b0'Q  
   Else )$h9Y   
      '判断斜率存在否 arQ%  
      If p1x = p3x And p2x <> p4x Then ,1;8DfVZV  
         tt = "ac_n_bd_y"
&N_c-@2O  
      ElseIf p1x <> p3x And p2x = p4x Then N$&ePU J  
         tt = "ac_y_bd_n" Cj 2Xl  
      ElseIf p1x <> p3x And p2x <> p4x Then U.7y8#qf3R  
         tt = "ac_y_bd_y" tq:tY}:4  
      End If ?b7g9 G4  
    Select Case tt 
<ii1nz  
         Case "ac_n_bd_y" 0s9z @>2  
            'bd线段方程 tm1UH 4  
            k_bd = bdy / bdx 5 t`ap  
            b_bd = p2y - k_bd * p2x @IY?DO  
            p_x = p1x &f<1=2dm  
            p_y = k_bd * p_x + b_bd !GGGh0Bj  
         Case "ac_y_bd_n" IPR tm!  
            'ac线段方程 _d| 62VS  
            k_ac = acy / acx 71"JL",  
            b_ac = p1y - k_ac * p1x Y0B1xL@  
            p_x = p2x 4<Sa,~4  
            p_y = k_ac * p_x + b_ac [&qbc#L  
        Case "ac_y_bd_y" 1uS-Tx  
           'ac，bd线段都要求 zL}
,`:(.  
           k_ac = acy / acx /3[9{r  
           b_ac = p1y - k_ac * p1x M1^C8cz  
           k_bd = bdy / bdx 51M^yG&M  
           b_bd = p2y - k_bd * p2x 1:x
nD  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) +Sd,l>8\  
           p_y = k_ac * p_x + b_ac \}x'>6zr2  
        End Select ]AA%J@  
      rt(1) = p_x bLM"t0  
      rt(2) = p_y CSL{Q  
     2>}\XKF).  
'计算最大半径 h [IYA1/y  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) pP0Vg'V  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) $?)3&\)R  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) i,IM?+4  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) OOBcJC  
Dim bb(5) As Single 3Q$'qZw p  
  bb(1) = rr1 ~`\9Q  
  bb(2) = rr2 RzzFhU#r  
  bb(3) = rr3 _rMT{q3  
  bb(4) = rr4 )jk1S  
  nb = rr1 u.
kY
p  
For i = 1 To 4 q^N0abzgP  
    If nb <= bb(i) Then
B80odU&  
       nb = bb(i) B8UZ9I$n  
    End If wVp4c?s  
Next i !rXcGj(k  
    rt(0) = Sqr(nb) *F szGn<  
    rr = rt() %[nR|a<  
  End If !FB \h<6  
         \+{t4Im  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  B%tIwUE2  

U4>O\sU  
有热压工艺方面的人才或者资料分享下； X^}A*4j  
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 }q%jO  

高手真多！

楼主威武霸气.