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""" A drag drawn polygon. """
from __future__ import with_statement
from enable.primitives.api import Polygon
from enable.api import Pointer
from pyface.action.api import MenuManager
from traits.api import Delegate, Instance
from drawing_tool import DrawingTool
class DragPolygon(DrawingTool):
""" A drag drawn polygon. """
poly = Instance(Polygon, args=())
draw_mode = "overlay"
#### Visible style. ####
# Override the vertex color so as to not draw it.
vertex_color = Delegate('poly', modify=True)
# Override the vertex size so as to not draw it.
vertex_size = Delegate('poly', modify=True)
background_color = Delegate('poly', modify=True)
#### Pointers. ####
# Pointer for the complete state.
complete_pointer = Pointer('cross')
# Pointer for the drawing state.
drawing_pointer = Pointer('cross')
# Pointer for the normal state.
normal_pointer = Pointer('cross')
#### Miscellaneous. ####
# The context menu for the polygon.
menu = Instance(MenuManager)
def reset(self):
self.vertex_color = (0,0,0,0)
self.vertex_size = 0
self.poly.model.points = []
self.event_state = "normal"
return
###########################################################################
# 'Component' interface.
###########################################################################
#### 'complete' state #####################################################
def complete_draw ( self, gc ):
""" Draw the completed polygon. """
with gc:
self.poly.border_dash = None
self.poly._draw_closed(gc)
return
def complete_left_down ( self, event ):
""" Draw a new polygon. """
self.reset()
self.normal_left_down( event )
return
def complete_right_down ( self, event ):
""" Do the context menu if available. """
if self.menu is not None:
if self._is_in((event.x + self.x, event.y - self.y)):
menu = self.menu.create_menu(event.window.control)
### FIXME : The call to _flip_y is necessary but inappropriate.
menu.show(event.x, event.window._flip_y(event.y))
return
#### 'drawing' state ######################################################
def drawing_draw ( self, gc ):
""" Draw the polygon while in 'drawing' state. """
with gc:
self.poly.border_dash = (4.0, 2.0)
self.poly._draw_open(gc)
return
def drawing_left_up ( self, event ):
""" Handle the left mouse button coming up in 'drawing' state. """
self.event_state = 'complete'
self.pointer = self.complete_pointer
self.request_redraw()
self.complete = True
return
def drawing_mouse_move ( self, event ):
""" Handle the mouse moving in 'drawing' state. """
last_point = self.poly.model.points[-1]
# If we have moved, we need to add a point.
if last_point != (event.x + self.x, event.y - self.y):
self.poly.model.points.append((event.x + self.x, event.y - self.y))
self.request_redraw()
return
#### 'normal' state #######################################################
def normal_left_down ( self, event ):
""" Handle the left button down in the 'normal' state. """
self.poly.model.points.append((event.x + self.x, event.y - self.y))
self.event_state = 'drawing'
self.pointer = self.drawing_pointer
self.request_redraw()
return
def normal_mouse_move ( self, event ):
""" Handle the mouse moving in the 'normal' state. """
self.pointer = self.normal_pointer
return
#### EOF ######################################################################
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