Draw rectangle on a Window DC

[Dennis Lee Bieber]

Anand fed this fish to the penguins on Monday 21 October 2002 07:01 am:

> Hi
> 
>     I need to draw a rectangle when the user selects an area
> over a wxPanel containing a wxStaticBitmap. The rectangle shoud change
> in size according to the dragging of the mouse.
>
        I have no idea of the features of wx* but...
 
>  How do I write the event processing code so that I dont have many
> rectangles overlapping each other, but just one that keeps changing
> size ?
>
        The general technique for "rubber band" lines is to draw with an 
exclusive-or operator. Then, before updating position, you redraw on 
the old coordinates.
 
> The code I have right now,
> 
>  if event.Dragging():
>                   
        somewhere in here you need to redraw/erase the old box, THEN get the 
new

>                     self.endpt = event.GetPosition()
>                     w = (self.endpt.x - self.stpt.x) # stpt is stored
>                     in earlier
>                                                      # left mouse
>                                                      # click.

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