Chris and FloatCanvas Users,
Awhile back I messaged about the development of a Bounding Box HitMap
system for the FloatCanvas. Here is an update. The HitTest() function of
the FloatCanvas, in addition to identifying which objects bounding boxes
contain the hitpoint, should determine which is on top by referencing
the self._ForeDrawList and self._DrawList (in that order) through a
python list index. I have attached the code below in case anyone else is
interested or can give me pointers on how to improve this code. I will
eventually have to develop a Z index which I believe can be attached to
the FloatCanvas Object, but at first I would imagine each Z index will
contain many objects, and ultimately the order will get determined by
the _DrawList and _ForeDrawList once again.
def HitTest(self, event, HitEvent):
""" Hit Test Function for BoundingBox Based HitMap System"""
if self.HitDict:
#Get Mouse Event Position
xy = event.GetPosition()
xy = self.PixelToWorld( xy ) #Convert to the correct coords
objects = [] #Create object list for holding multiple objects
object_index_list = [] #Create list for holding the indexes
# check if there are any objects in the dict for this event
for key2 in self.HitDict[HitEvent].keys():
bb = self.HitDict[HitEvent][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]:
Object = self.HitDict[HitEvent][key2]
objects.append([Object,xy])
try:
#First try the foreground index and add the
length of the background index
#to account for the two 'layers' that already
exist in the code
index = self._ForeDrawList.index(Object) +
len(self._DrawList)
except:
index = self._DrawList.index(Object) #Now check
background if not found in foreground
object_index_list.append(index) #append the index found
for index,item in enumerate(objects):
print item[0].Name,object_index_list[index]
if len(objects) > 0: #If no objects then do nothing
#Get the highest index object
highest_object_array =
objects[object_index_list.index(max(object_index_list))]
#Unpack Array
highest_object = highest_object_array[0]
highest_xy = highest_object_array[1]
#Assign Hit Coords and do CallBackFunction
highest_object.HitCoords = self.PixelToWorld( highest_xy )
highest_object.HitCoordsPixel = highest_xy
highest_object.CallBackFuncs[HitEvent](highest_object)
return True
else:
return False
--
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: [email protected]
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