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发表于 2010-1-23 12:34:45
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本帖最后由 sealive_leafage 于 2010-1-23 12:37 编辑 q: ^( b0 q q% a( |; w2 }
" N* ^% g r; n' i- V7 C问题的难点在于在CAD中如何动态实时获得鼠标点的坐标,网上收集了些资料楼主可以体会一下;获得坐标值后则可以实现楼主要求的效果;详细参考:http://tiancao.net/blogview.asp?logID=214
Y: D$ Z8 P9 [# T6 _# z0 W R- _( NCAD VBA实现橡皮筋直线、圆
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5 a- @- v4 v& ^* X9 m# s首先是计时控件,然后是实时捕捉鼠标的屏幕位置,然后是转换获得CAD当前试图鼠标所在的位置坐标,然后才是实时绘制直线或圆。2 g/ n! }5 A- y! m' u, W; `" o
VBA中不可直接使用vb的timer控件,我们可以调用独立的xTimer控件。5 E1 \- U7 S1 d: j# \/ {0 t
控件下载:
: l# q2 `3 N% W' g2 T. S @http://www.tiancao.net/flashget.asp?dizhi=http://www.tiancao.net/attachments/month_0707/qnft_XTimers.rar" z! V3 r# v. Q) G4 t" A
k3 k5 J7 Q/ H7 K( c8 o然后是使用API函数GetCursorPos获得当前鼠标的屏幕坐标。: }. R) J1 L. @% D. I
然后通过读取CAD系统变量viewSize荷Screensize分别得到当前试图的CAD高度和当前视口的屏幕尺寸(屏幕分辨率的像素).然后得到CAD实际尺寸和屏幕像素的比值。
0 n% q1 A* u: W0 [% [精确度于鼠标的频率快慢有关系! u3 `* ^+ h" p; c. J
1 s. O: l8 z4 ~% T% ~" l'获取CAD坐标系统和屏幕像素的比值% G/ F9 a, w1 s
Function ViewScreen() As Double; t; e. O) t! {+ k$ t
Dim ScreenSize As Variant9 a! d5 V+ F% C' x1 J
ScreenSize = ThisDrawing.GetVariable("screensize") '当前视口的屏幕宽度和高度
8 @, [$ P, ?" |2 R$ t8 k( B Dim H As Variant( z+ l' J* W+ W6 ~" l- y" h
H = ThisDrawing.GetVariable("viewsize") '当前视图图形的实际高度
! V7 m% }( Z# ]% D% R" N+ I0 @ ViewScreen = Abs(H / ScreenSize(1))
& g# e+ y' w8 k k5 pEnd Function+ c6 ~8 V0 t5 ^5 p, Y7 Q
Public Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
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& W& c& i8 h% C9 x, r2 r: A实时获得鼠标的屏幕坐标,然后通过屏幕尺寸和cad实际尺寸的比值,计算出鼠标当前的cad坐标。$ K: c8 k/ f; y8 w
然后在基点和鼠标坐标之间绘制直线或圆。. {9 ~8 b! z3 I, s
值得注意的是,屏幕坐标的是以屏幕的左上角为原点的。而cad的世界坐标是以右下角为原点的。0 ?+ J( _- A1 d1 s }- @
% J2 H, T: J8 P' Z4 @6 @) k'得到鼠标屏幕坐标
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Private Type POINTAPI: l5 s! K& L. F2 u& A) B
x As Long l8 B3 Y" _! D3 d" ]
Y As Long
# n& e) M: K& o3 k* w$ W% xEnd Type, x4 k+ ^& q1 _) Y4 w& {
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
6 i1 `% D/ z6 ?! ^3 P1 oDim CAD_Point1 As Variant
! J! `/ a- t Y9 [Dim CAD_Point2 As Variant' ]: U l( y$ _$ m0 p: I' Z! }
Dim ScreenPoint1 As POINTAPI
5 x) @" r b4 r* Q- k% XDim ScreenPoint2(1) As Long
1 n# t1 O- Y4 r/ j G+ ~0 M' t bDim BiLi As Double
! f1 p, z2 d. V/ j- ^, b7 B'获取CAD坐标系统和屏幕像素的比值
: T! D1 `7 H& E$ nFunction ViewScreen() As Double
8 V, \ }4 B# c& h6 `/ h, S: i Dim ScreenSize As Variant
& j9 n9 V9 N: H6 U ScreenSize = ThisDrawing.GetVariable("screensize") '当前视口的屏幕宽度和高度
$ j3 m, F x' j Dim H As Variant, R, ~ B, ^5 [" p* [% ?
H = ThisDrawing.GetVariable("viewsize") '当前视图图形的实际高度2 B4 w7 [' @# @% K Z4 E
ViewScreen = Abs(H / ScreenSize(1))
$ w' H3 w& l7 X3 @( S1 ]) i" ?End Function; a- j, S t5 s4 a, V
'通过CAD坐标计算屏幕坐标2 d$ C/ \- U: `
Sub GetScreenPoint()
6 V! |) Y! q& m+ {# C" t, P BiLi = ViewScreen
) W$ ^5 k: L' k7 T& R U CAD_Point1 = ThisDrawing.Utility.GetPoint(, "先指定一个点:") '获得鼠标所在位置的CAD坐标
6 _/ q# Z# B5 A4 T& B2 }. m2 D ThisDrawing.ModelSpace.AddPoint CAD_Point1+ k; z1 e6 [% P, f1 Q
GetCursorPos ScreenPoint1 '通过api直接获得鼠标所在位置的屏幕坐标
* F6 D% f8 N& G0 O' ]3 O0 i MsgBox "屏幕坐标:" & ScreenPoint1.x & " / " & ScreenPoint1.Y
- Y6 N8 x0 V7 N; b* Z6 _8 ~9 R9 z* e MsgBox "对应的CAD坐标:" & CAD_Point1(0) & " / " & CAD_Point1(1)
. q7 G5 p2 B f! h; z '以上获得了CAD坐标和屏幕坐标的对应关系,下面就可以计算了8 r+ C0 j2 u2 |" K
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CAD_Point2 = ThisDrawing.Utility.GetPoint(CAD_Point1, "指定下一点,这个点将通过计算得到屏幕坐标:")% U* S8 w$ b: i6 J, ?) k
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ScreenPoint2(0) = Int(ScreenPoint1.x + (CAD_Point2(0) - CAD_Point1(0)) / BiLi)
! `0 z) D8 H2 m3 t6 Q% l ScreenPoint2(1) = Int(ScreenPoint1.Y - (CAD_Point2(1) - CAD_Point1(1)) / BiLi): G1 g% \% i% P: e
MsgBox "屏幕坐标:" & ScreenPoint2(0) & " / " & ScreenPoint2(1)! q: a! W2 R. Y7 D) j. I2 g
'为了验证计算坐标,将CAD窗口在屏幕上移动到该点,看看效果吧。, Z0 s7 Q1 M* x8 N' I) z S( E
ThisDrawing.Application.WindowState = acNorm
2 W# g1 Z9 R( H$ A: M ThisDrawing.Application.WindowLeft = ScreenPoint2(0)
$ M1 K# I# h2 U. M ThisDrawing.Application.WindowTop = ScreenPoint2(1)+ a2 }, f' p. o% s' b
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End Sub$ {/ ?6 R' ~# ]# Z+ ^. @! Q; ]
' 通过屏幕坐标计算CAD坐标4 j' w* y' O& Q9 s( E/ v
Sub GetCAD_Point() i/ R; R5 G+ c1 j* L+ U( m
BiLi = ViewScreen
4 O/ f3 g3 D$ n B+ Z0 f CAD_Point1 = ThisDrawing.Utility.GetPoint(, "先指定一个点:") '获得鼠标所在位置的CAD坐标
- _' [# y( @1 Q0 D2 r. X/ b ThisDrawing.ModelSpace.AddPoint CAD_Point1, A! T: J- o# j: e$ |# Z6 Q
GetCursorPos ScreenPoint1 '通过api直接获得鼠标所在位置的屏幕坐标
8 X9 p( q' F7 m MsgBox "屏幕坐标:" & ScreenPoint1.x & " / " & ScreenPoint1.Y& ]2 O7 I7 t. e
MsgBox "对应的CAD坐标:" & CAD_Point1(0) & " / " & CAD_Point1(1)
# z5 o& X& c! b4 R: Q '以上获得了CAD坐标和屏幕坐标的对应关系,下面就可以计算了6 l: H3 `: M5 D4 o+ q" u6 q
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Dim ScreenPoint3 As POINTAPI
, C0 t6 _- ~; u1 d, Q/ `. v GetCursorPos ScreenPoint3
) {/ s, F& [0 i0 C0 u% m# K
- R* e( h1 c+ c5 K Dim CAD_Point3(2) As Double
7 i9 u! S2 t% [5 S '计算cad坐标2 T- ]% ], G0 c
CAD_Point3(0) = CAD_Point1(0) + BiLi * (ScreenPoint3.x - ScreenPoint1.x)
' }# q$ u4 l; y# w; W4 V3 ^ CAD_Point3(1) = CAD_Point1(1) - BiLi * (ScreenPoint3.Y - ScreenPoint1.Y)
8 ]1 z+ v, y# u CAD_Point3(2) = 0- u( j* n8 E$ n: y! l: x* O: @: N
MsgBox "屏幕坐标:" & CAD_Point3(0) & " / " & CAD_Point3(1)% R6 t# f( V( v) x `- E4 _
'为了验证计算坐标,将画一条直线,看看效果吧。
# y% u6 t: B8 F2 Q& Y ThisDrawing.ModelSpace.AddLine CAD_Point1, CAD_Point3- P2 d5 P( B" M! R- w/ d, A
End Sub |
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