[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： '{WEyhaS  
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关键点说几个： 4- QlIIf  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） IhzY7U)}T  
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 qG,h 1  
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 l^I?@{W  

以下是几个重要的函数： ,R=!ts[qi  
1.判断点在区域中函数 I;}U/'RR>  
2.计算夹角函数 Mxw-f4j  
3.转置函数 r1F5'?NZ(0  
4.得到区域中心点，及区域半径函数 64b AWHv  
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） t>quY$}4  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 V|A.M-XLv4  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single De3;}]wC  
   cax = x2 - x1 Q~"Lyy8  
   cay = y2 - y1 OqsuuE  
   cbx = x2 - x3 xN$V(ZX4  
   cby = y2 - y3 zEQQ4)mA  
   mo_jj = cax * cbx + cay * cby auIW>0?}  
   mo_ca = Sqr(cax * cax + cay * cay) _"F=4`lJ  
   mo_cb = Sqr(cbx * cbx + cby * cby) ~i?Jg/qcxN  
   cos_acb = mo_jj / (mo_ca * mo_cb) t{UWb~"  
   'ff_cos = cos_acb A'![*O  
   If cos_acb >= 1 Then [qxpu{  
   nn = 0 Q,9KLi3  
   ElseIf cos_acb <= -1 Then ?0u"No52m  
   nn = 3.14159265258979 >r)UDa+  
   Else Ib2&L  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) ~
BTm6*'h  
   End If R4)l4rnO  
   'ff_angle = nn %1cxZxGT  
   ff_angle = nn * 180 / 3.14159265258979 kLs{B  
End Function

'判断点在区域内函数 L#D)[v"  
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 3>5gh8!-  
Dim aob, boc, cod, doa, sum As Single y]i}j,e0L  
  If ppx = p1x And ppy = p1y Then %26HB w=JF  
     point_in = True k,OxGG  
     Exit Function &9Z@P[f  
  End If kSJ;kz,_  
  If ppx = p2x And ppy = p2y Then 8%; .H-  
     point_in = True oN83`Z  
     Exit Function [N*S5^>1  
  End If .1h\r, #  
   If ppx = p3x And ppy = p3y Then 4ke.p<dG  
     point_in = True nRHlHu  
     Exit Function 6P9#6mZ  
  End If !oRN,m[7)p  
     }f{5-iwD}  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) S=L#8CID  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) blG?("0!  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) #RdcSrw)W!  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 0|hOoO]?q&  
    sum = aob + boc + cod + doa cy8r}wD  
    If 360.01 > sum And sum > 359.99 Then 0ikA@SAq  
       point_in = True MD0d  
    Else bLggh]Fh  
       point_in = False ~T._v;IT  
    End If sV%=z}n=  
End Function

'得到点半径,得到交点坐标函数 @71y:)W<  
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() MqWM!v-M  
    '求得中心点坐标 sWq}/!@&  
Dim tt As String {v3@g[:|  
Dim rt(3) As Single g1UQ6Oa  
    '判断是否平行 ;$r!eFY;  
   acx = p3x - p1x Ko0T[TNkh  
   acy = p3y - p1y e7Sg-NWV  
   bdx = p4x - p2x ~a>3,v-  
   bdy = p4y - p2y fhHTp_u)2  
   If acx * bdy = acy * bdx Then mL@7,GD  
      rt(0) = 0 @a]`C $6  
      Exit Function )qWO}]F  
   Else 4tt=u]:  
      '判断斜率存在否 {X\FS  
      If p1x = p3x And p2x <> p4x Then MLmk=&d  
         tt = "ac_n_bd_y" >BMtR0
  
      ElseIf p1x <> p3x And p2x = p4x Then =*WfS^O  
         tt = "ac_y_bd_n" :y!{=[>M(  
      ElseIf p1x <> p3x And p2x <> p4x Then 51>OwEf<R  
         tt = "ac_y_bd_y" #/K71Y  
      End If BLo=@C%w5  
    Select Case tt *^%ohCUi  
         Case "ac_n_bd_y" 1Dm$:),^T}  
            'bd线段方程 *pGbcB
Q  
            k_bd = bdy / bdx J\ 
?  
            b_bd = p2y - k_bd * p2x n*qn8Dq  
            p_x = p1x G7HvA46  
            p_y = k_bd * p_x + b_bd p#dYNed]'  
         Case "ac_y_bd_n" #fF';Y7  
            'ac线段方程 V#-8[G6Ra  
            k_ac = acy / acx &Mh]s\  
            b_ac = p1y - k_ac * p1x p:4oA
<V  
            p_x = p2x `[4{]jX+<  
            p_y = k_ac * p_x + b_ac 9\R+g5  
        Case "ac_y_bd_y" f:A1j\A?  
           'ac，bd线段都要求 sCAWrbOe>  
           k_ac = acy / acx ?CuwA-j  
           b_ac = p1y - k_ac * p1x z`y^o*qc]  
           k_bd = bdy / bdx R?kyJ4S  
           b_bd = p2y - k_bd * p2x ]*AQT7PH  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) v
}"DW?  
           p_y = k_ac * p_x + b_ac TP)}1@  
        End Select hzy#%FaB  
      rt(1) = p_x ]A:G>K  
      rt(2) = p_y Al}%r85  
     E"Y[k8-:2/  
'计算最大半径 09HqiROw  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) ~$ "P\iJ  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) bX&=*L+h6  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) 140_WV?7  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 8<X; 8R  
Dim bb(5) As Single (yhnvZ  
  bb(1) = rr1 DqBiBH[%h  
  bb(2) = rr2 Q2xzux~T  
  bb(3) = rr3 6t`cY  
  bb(4) = rr4 2xpI|+a%  
  nb = rr1 H_7EK  
For i = 1 To 4 Wc{/K6]f  
    If nb <= bb(i) Then ;[[oZ  
       nb = bb(i) agPTY{;  
    End If 4Y}{?]>pu  
Next i 5*Y(%I<  
    rt(0) = Sqr(nb) |Skhx9};  
    rr = rt() sb*)K,U  
  End If _B^Q;54c  
         X?OH//co  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  Z|$M 9E  

y$[:Kh,  
有热压工艺方面的人才或者资料分享下； !!?TkVyEyM  
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 " `FcW  

高手真多！

楼主威武霸气.