[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： -@(LN%7
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关键点说几个： \KhcNr?ja=  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） yk?bz  
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 xcW\U^1d  
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 K{DC{yLu  

以下是几个重要的函数： 17KQ  
1.判断点在区域中函数 >1!u]R<3  
2.计算夹角函数 7zw0g~+  
3.转置函数 8<Iq)A]'Z  
4.得到区域中心点，及区域半径函数 gvT}UNqL  
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） ]`$yY5&W0  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 : b`N(]  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single P'8RaO&d  
   cax = x2 - x1 6m?<"y8]  
   cay = y2 - y1 N0S^{j,i  
   cbx = x2 - x3 4O-LLH  
   cby = y2 - y3 6{.U7="  
   mo_jj = cax * cbx + cay * cby qa^cJ1@  
   mo_ca = Sqr(cax * cax + cay * cay) f1aZnl  
   mo_cb = Sqr(cbx * cbx + cby * cby) o.!o4&WH  
   cos_acb = mo_jj / (mo_ca * mo_cb) Cik1~5iF  
   'ff_cos = cos_acb i24k ]F  
   If cos_acb >= 1 Then L/jaUt[,  
   nn = 0 ;B 8Q,.t>x  
   ElseIf cos_acb <= -1 Then Z4/D38_  
   nn = 3.14159265258979 gV.?Myy  
   Else 6Pl|FIJF  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 3&})gU&a  
   End If 5/nL[4Z  
   'ff_angle = nn >Gpq{Ph[  
   ff_angle = nn * 180 / 3.14159265258979 r&8aB85  
End Function

'判断点在区域内函数 v Z]j%c@  
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 cV6H!\  
Dim aob, boc, cod, doa, sum As Single @LOfqQ$FE  
  If ppx = p1x And ppy = p1y Then ZXs,TaU  
     point_in = True H]tD~KM<  
     Exit Function }iKjef#J  
  End If :7LA/j  
  If ppx = p2x And ppy = p2y Then sf2%WPK  
     point_in = True ;l!<A  
     Exit Function zp8x/,gwF  
  End If }o:LwxNO  
   If ppx = p3x And ppy = p3y Then cVx SO`jZw  
     point_in = True mQ`atFz:Z  
     Exit Function $[A^8[//  
  End If t[2b~peNI  
     H(;@7dh  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) pZS]i "  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) g "Du]_,  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) O=bkq}  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) /g>-s&w  
    sum = aob + boc + cod + doa &UH0Tw4   
    If 360.01 > sum And sum > 359.99 Then me2vR#  
       point_in = True ?rOj?J9  
    Else
GAY?F  
       point_in = False 82,^Pu  
    End If >g !Z|ju  
End Function

'得到点半径,得到交点坐标函数 :2xGfy??  
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() uT=r*p(v  
    '求得中心点坐标 * ;sz/.  
Dim tt As String <k8WnA ~Fl  
Dim rt(3) As Single =LLpJ+  
    '判断是否平行 fLs>|Rh  
   acx = p3x - p1x Vq0X:<9  
   acy = p3y - p1y ZhCd**  
   bdx = p4x - p2x pmBN?<  
   bdy = p4y - p2y j_,/U^Ws|f  
   If acx * bdy = acy * bdx Then I*%3E.Z@g  
      rt(0) = 0 OP+*%$wR  
      Exit Function axmq/8X  
   Else Z{vc6oj  
      '判断斜率存在否 (L4llZ;q  
      If p1x = p3x And p2x <> p4x Then YSxr(\~j  
         tt = "ac_n_bd_y" i Ehc<  
      ElseIf p1x <> p3x And p2x = p4x Then `EgX#  
         tt = "ac_y_bd_n" QaLaw-lx  
      ElseIf p1x <> p3x And p2x <> p4x Then OMk3\FV2Z  
         tt = "ac_y_bd_y" Dn<3#V  
      End If EG^ rh;  
    Select Case tt ;B |  
         Case "ac_n_bd_y" LodP,\T  
            'bd线段方程 V?yQm4  
            k_bd = bdy / bdx DXD+,y\=  
            b_bd = p2y - k_bd * p2x ,k_ b-/  
            p_x = p1x ;Egl8Vhr  
            p_y = k_bd * p_x + b_bd dpE^BWv3  
         Case "ac_y_bd_n" ~Qif-|[V  
            'ac线段方程 `vzMuL;  
            k_ac = acy / acx J#H,QYnf(L  
            b_ac = p1y - k_ac * p1x 4_>;|2  
            p_x = p2x Q'jGNWep  
            p_y = k_ac * p_x + b_ac ylos6]zS8  
        Case "ac_y_bd_y" v$@1q9 5J  
           'ac，bd线段都要求 fk15O_#3  
           k_ac = acy / acx D"$ 97  
           b_ac = p1y - k_ac * p1x c/.s`hz  
           k_bd = bdy / bdx I/upiqy  
           b_bd = p2y - k_bd * p2x %h0BA.r  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) 0J[B3JO@M  
           p_y = k_ac * p_x + b_ac .!^O
mT,u  
        End Select !W,LG$=/  
      rt(1) = p_x PUD
8  
      rt(2) = p_y |g \_xl  
     A#']e8  
'计算最大半径 unFm~rcf  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) , 0X J|#%  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) }9U_4k  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) AXxyB"7A}  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) d]K8*a%[-  
Dim bb(5) As Single ~Fo2MwE2~  
  bb(1) = rr1 f uU"  
  bb(2) = rr2 pRlScD_};  
  bb(3) = rr3 wbr$w>n  
  bb(4) = rr4 UxB3/!<5g3  
  nb = rr1 2s,cyCw&  
For i = 1 To 4 z@ZI$.w  
    If nb <= bb(i) Then vq9O|E3  
       nb = bb(i) s^6,"C  
    End If zN5};e}^v  
Next i {4SaSv^/  
    rt(0) = Sqr(nb) };}N1[D  
    rr = rt() Iw?f1]  
  End If T1RY1hb|g>  
         WoNJF6=?  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  48;b  

#{k+^7aQ  
有热压工艺方面的人才或者资料分享下； FL$S_JAw  
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 3T 0'zJ2f  

高手真多！

楼主威武霸气.