ImagXpress可以讓用戶選擇正在瀏覽的圖像的一部分，這個(gè)部分中，稱為Rubberband，可以用很多種方式使用：比如，復(fù)制到另一個(gè)控制或緩沖區(qū)，或被選擇作為一個(gè)區(qū)域來處理。下面來看一下在Activex & COM版本中Rubberband的使用。

Rubberband使用

1、調(diào)用RubberBand方法，設(shè)置state = true，在一個(gè)指定的位置啟動(dòng)一個(gè)rubberband。

2、調(diào)用RubberbandUpdate方法更新rubberband矩形的結(jié)束坐標(biāo)，RubberBandH 、RubberBandW、RubberBandL和RubberBandT屬性真是可讀，會(huì)返回rubberband矩形坐標(biāo)的的高度、寬度和坐標(biāo)，當(dāng)調(diào)用RubberBand方法的時(shí)候，就會(huì)更新這些屬性。

3、調(diào)用 CopyRubberbandDIB 方法，復(fù)制rubberband構(gòu)建的內(nèi)容到一個(gè)DIB中。

Activate the rubberband when the user first clicks the mouse
Private Sub ImagXpress1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
     ' CLEAR ANY EXISTING RUBBER BANDING REGION
     ImagXpress1.RubberBand False, X, Y, False
     ' CONVERT X & Y TO PIXELS
     X = X / Screen.TwipsPerPixelX
     Y = Y / Screen.TwipsPerPixelY
 
     ' TURN THE RUBBER BANDING ON, SET THE STARTING POINT
     ImagXpress1.RubberBand True, X, Y, False
End Sub
 
' Track the user's changes whenever they move the mouse
Private Sub ImagXpress1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
' UPDATE THE RUBBER BAND
X = X / Screen.TwipsPerPixelX
Y = Y / Screen.TwipsPerPixelY
ImagXpress1.RubberbandUpdate X, Y
End Sub
 
' Do something with the region when the user lifts off the mouse
Private Sub ImagXpress1_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
Dim xpos, ypos, w, h As Integer
' YOU CAN DO ANYTHING WITH, OR TO, THE REGION THE USER HAS SELECTED. IN THIS EXAMPLE, WE WILL
' COPY THE AREA TO ANOTHER CONTROL.
ImagXpress2.hDib = ImagXpress1.CopyRubberbandDib
ImagXpress2.ZoomToFit ZOOMFIT_BEST
' TURN THE RUBBER BAND OFF
ImagXpress1.RubberBand False, X, Y, False
End Sub

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