Hi Mailing List and Hi Chris,
I have a strange problem when scrolling/panning using the GUIMove Mode.
In my class, i have a FloatCanvas like this:
self.canvas = FloatCanvas.FloatCanvas(self, ProjectionFun = None,
Debug = 0,BackgroundColor = "GREY",)
on which i'm scrolling using a modified GUIMove. Modified in the way
that i just mapped scrolling to the right button instead of the left.
So it's basically:
def OnLeftDown(self, event):
EventType = FloatCanvas.EVT_FC_LEFT_DOWN
if not self.Canvas.HitTest(event, EventType):
self.Canvas._RaiseMouseEvent(event, EventType)
def OnLeftUp(self, event):
EventType = FloatCanvas.EVT_FC_LEFT_UP
if not self.Canvas.HitTest(event, EventType):
self.Canvas._RaiseMouseEvent(event, EventType)
def OnLeftDouble(self, event):
EventType = FloatCanvas.EVT_FC_LEFT_DCLICK
if not self.Canvas.HitTest(event, EventType):
self.Canvas._RaiseMouseEvent(event, EventType)
def OnRightUp(self, event):
if self.StartMove is not None:
StartMove = self.StartMove
EndMove = N.array(event.GetPosition())
DiffMove = StartMove-EndMove
if N.sum(DiffMove**2) > 16:
self.Canvas.MoveImage(DiffMove, 'Pixel')
self.StartMove = None
self.Canvas.SetCursor(self.Cursor)
def OnRightDown(self, event):
self.Canvas.CaptureMouse()
self.StartMove = N.array( event.GetPosition() )
self.PrevMoveXY = (0,0)
EventType = FloatCanvas.EVT_FC_RIGHT_DOWN
if not self.Canvas.HitTest(event, EventType):
self.Canvas._RaiseMouseEvent(event, EventType)
I had the OnMove and MoveImage Methods defined like this:
def OnMove(self, event):
self.Canvas.MouseOverTest(event)
self.Canvas._RaiseMouseEvent(event,FloatCanvas.EVT_FC_MOTION)
self.Canvas.MouseOverTest(event)
self.Canvas._RaiseMouseEvent(event,FloatCanvas.EVT_FC_MOTION)
if event.Dragging() and event.RightIsDown() and not
self.StartMove is None:
self.MoveImage(event)
def MoveImage(self, event):
xy1 = N.array( event.GetPosition() )
wh = self.Canvas.PanelSize
xy_tl = xy1 - self.StartMove
dc = wx.ClientDC(self.Canvas)
dc.BeginDrawing()
x1,y1 = self.PrevMoveXY
x2,y2 = xy_tl
w,h = self.Canvas.PanelSize
##fixme: This sure could be cleaner!
## This is all to fill in the background with the background color
## without flashing as the image moves.
if x2 > x1 and y2 > y1:
xa = xb = x1
ya = yb = y1
wa = w
ha = y2 - y1
wb = x2- x1
hb = h
elif x2 > x1 and y2 <= y1:
xa = x1
ya = y1
wa = x2 - x1
ha = h
xb = x1
yb = y2 + h
wb = w
hb = y1 - y2
elif x2 <= x1 and y2 > y1:
xa = x1
ya = y1
wa = w
ha = y2 - y1
xb = x2 + w
yb = y1
wb = x1 - x2
hb = h - y2 + y1
elif x2 <= x1 and y2 <= y1:
xa = x2 + w
ya = y1
wa = x1 - x2
ha = h
xb = x1
yb = y2 + h
wb = w
hb = y1 - y2
dc.SetPen(wx.TRANSPARENT_PEN)
dc.SetBrush(self.Canvas.BackgroundBrush)
dc.DrawRectangle(xa, ya, wa, ha)
dc.DrawRectangle(xb, yb, wb, hb)
self.PrevMoveXY = xy_tl
if self.Canvas._ForeDrawList:
dc.DrawBitmapPoint(self.Canvas._ForegroundBuffer,xy_tl)
else:
dc.DrawBitmapPoint(self.Canvas._Buffer,xy_tl)
dc.EndDrawing()
This is basically just grabbed from an earlier version of Chris' GUIMode.py.
However, this gives me the bug that whenever a border of the canvas is
reached, the application just crashes (without giving an error or anything).
I tried replacing the methods with those from recent GUIMove in the
subversion, where OnMove is:
def OnMove(self, event):
# Allways raise the Move event.
self.Canvas._RaiseMouseEvent(event,FloatCanvas.EVT_FC_MOTION)
if event.Dragging() and event.LeftIsDown() and not
self.StartMove is None:
self.MoveImage(event)
and MoveImage is basically exactly the same.
However, this gives me a HUGE Performance problem, as scrolling gets so
slow it basically doesn't happen anymore.
I can't see what's wrong. Anyone?
Thank you,
--
Niels Menke
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