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# Copyright 2007 Nanorex, Inc. See LICENSE file for details.
"""
test_polyline_drag.py
@author: Bruce
@version: $Id$
Simple test/example code for making a polyline.
Goal is just to demonstrate intercepting mouse events
to change the usual meaning of a click,
detecting GLPane enter/leave, etc.
Not yet suitable for use as a real example.
Doesn't yet store the polyline anywhere.
Just a stub for now.
"""
from exprs.State_preMixin import State_preMixin
from prototype.test_commands import ExampleCommand
from geometry.VQT import V
from utilities.constants import red
# TODO: import the following from somewhere
DX = V(1,0,0)
DY = V(0,1,0)
ORIGIN = V(0,0,0)
from exprs.attr_decl_macros import Instance, State
from exprs.Rect import Line
from exprs.Rect import Spacer
from exprs.If_expr import If_expr
from exprs.ExprsConstants import Point
NullDrawable = Spacer() # kluge; should refile
class test_polyline_drag(State_preMixin, ExampleCommand):
# class constants needed by mode API for example commands
commandName = 'test_polyline_drag-commandName'
featurename = "Prototype: Example Polyline Drag Command"
## PM_class = test_polyline_drag_PM
# tracked state
rubberBand_enabled = State(bool, False, doc = "whether we're rubberbanding a new segment now")
# TODO:
### grab a polyline object from an example file in exprs ### (the one that has a closed boolean and can draw in 3d)
### have a list of them, we're rubberbanding last segment of last one...
lastSegmentStart = ORIGIN + 6 * DY # stub
lastSegmentEnd = State( Point, doc = "endpoint of last segment; only meaningful when rubberBand_enabled")
# note: these might be redundant with some points in a polyline object;
# should they be aliases into one?
rubberBandDrawable = If_expr( rubberBand_enabled,
Line( lastSegmentStart, lastSegmentEnd,
red,
thickness = 4
),
NullDrawable
)
whatWeDraw = Instance(rubberBandDrawable)
# init methods
def __init__(self, glpane):
# not sure why this method is needed, see comment in test_connectWithState.__init__
super(test_polyline_drag, self).__init__(glpane)
ExampleCommand.__init__(self, glpane)
return
def Draw(self):
super(test_polyline_drag, self).Draw() #k
self.whatWeDraw.draw()
return
def leftDown(self, event):
print "leftDown"
# TODO:
# get the point (mouseray in plane)
# make a real point there (or mark it as real, if we have a point object for it already)
# (so it has a blue dot of its own)
# update self.rubberBand_enabled
# STUB:
self.rubberBand_enabled = True
self.lastSegmentEnd = self.lastSegmentStart + 3 * DX
ExampleCommand.leftDown(self, event)
### will this prevent this error in mouse release:
## AttributeError: 'test_polyline_drag' object has no attribute 'LMB_press_event'
## [GLPane.py:1805] [selectAtomsMode.py:899]
return
pass
# end
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