Chris,
The application requires that users essentially create 'representations'
of things like city water distribution networks, which can get quite
large. You are correct that this only becomes a problem if we want the
objects to be 'hit-able' and there are more than ~10,000 of them.
Here is the solution I ended up with for hit testing without using a
color map (using the bounding box of the object) :
# Custom Hit Test Function to Replace FloatCanvas.HitTest
def HitTest(self, event, HitEvent):
if self.HitDict:
# check if there are any objects in the dict for this event
xy = event.GetPosition()
xy = self.PixelToWorld( xy )
for key in self.HitDict.keys():
for key2 in self.HitDict[key].keys():
bb = self.HitDict[key][key2].BoundingBox
if xy[0] > bb[0,0] and xy[0] < bb[1,0] and xy[1] <
bb[1,1] and xy[1] > bb[0,1]:
print 'Hit Found1'
Object = self.HitDict[key][key2]
## Add the hit coords to the Object
Object.HitCoords = self.PixelToWorld( xy )
Object.HitCoordsPixel = xy
Object.CallBackFuncs[HitEvent](Object)
print 'Hit Found2'
return True
return False
For the MouseOverTest I modified it to contain a similar loop.
I have found that the performance is nearly identical on my Core Duo
t2...@1.86ghz (2 GIG RAM) for up to 30,000 to 40,000 objects. Redrawing
the canvas with this many items is the limiting factor and any paint
action I want to have after the hit test is going to take awhile anyway.
I could speed this up to facilitate mouse over responses by indexing
items in a grid (making the number of dictionary items to loop through
smaller) but the most important thing for my application is that it
doesn't fail as objects get added to the workspace.
I am not sure if there is any underlying issue or problem with wxPython
or wxWidgets. It could very well be caching the brush and pens for the
dispaly bitmap. The color map requires that we have a different pen and
brush for each hit-able object, and whether or not they are cached can't
make a difference since it doesn't reduce the set.
Also, your link: [
http://msdn.microsoft.com/en-us/library/ms724291(VS.85
<http://msdn.microsoft.com/en-us/library/ms724291%28VS.85>).aspx ]
doesn't appear to be working.
Thanks for your help on this issue.
--
Benjamin Jessup
Mechanical Engineering Consultant
ABZ, Inc.
4451 Brookfield Corporate Dr. Suite 107
Chantilly, VA 20151
Office: (703)-631-7401
Fax: (703)-631-5282
Email: b...@abzinc.com
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