David Poundall wrote:
> Hi Chris,
> As part of my GUI interface I am emulating some of the functionality of
> visio. That is to say…
> Shift + wheel operation à pan left/right
>
> Wheel operation à Pan up/down
>
> Control + wheel operation à Zoom.
This should be quite doable , in a GUIMode. I think there are examples of:
wheel pan up/down
and
wheel Zoom
in various places. Zoom is certainly there.
> def OnKeyDown(self,event):
> self.controlDown = event.ControlDown()
> self.altDown = event.AltDown()
> self.shiftDown = event.ShiftDown()
This isn't the way to do it, what you want is something like:
def OnWheel(self, event):
modifier = None
if event.ShiftDown:
#pan left right code
elif event.CmdDown: (this is "command on Mac, control elsewhere)
if event.GetWheelRotation() < 0:
self.Canvas.Zoom(0.9)
else:
self.Canvas.Zoom(1.1)
else:
#pan up/down code
if event.GetWheelRotation() < 0:
self.Canvas.Zoom(0.9)
else:
self.Canvas.Zoom(1.1)
> if self.Pan.StartMove <> None:
> xy[1] = xy[1] + float(1.0*event.m_wheelRotation / 6)
> self.Pan.MoveImage(event, xy)
> print 'Up/Down ---- ',xy
MoveImage takes a "Shift" parameter -- how much you want to move the
image, not it's position. It can take either pixel or world coordinates:
def MoveImage(self, shift, CoordType):
"""
move the image in the window.
shift is an (x,y) tuple, specifying the amount to shift in each
direction
It can be in any of three coordinates: Panel, Pixel, World,
specified by the CoordType parameter
Panel coordinates means you want to shift the image by some
fraction of the size of the displaced image
Pixel coordinates means you want to shift the image by some
number of pixels
World coordinates mean you want to shift the image by an amount
in Floating point world coordinates
"""
So you need to decide how much you want to shift the image with each
click of the wheel -- 20 pixels? 1/10 of the Window width? whatever.
-Chris
--
Christopher Barker, Ph.D.
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