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""" The base class for moveable shapes. """
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# Standard library imports.
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# Enthought library imports.
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from enthought.enable.api import ColorTrait, Component, Pointer
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from enthought.kiva import Font, MODERN
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from enthought.traits.api import Float, Property, Str, Tuple
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class Shape(Component):
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""" The base class for moveable shapes. """
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#### 'Component' interface ################################################
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# The background color of this component.
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bgcolor = 'transparent'
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#### 'Shape' interface ####################################################
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# The coordinates of the centre of the shape.
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centre = Property(Tuple)
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fill_color = ColorTrait
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# The pointer for the 'normal' event state.
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normal_pointer = Pointer('arrow')
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# The pointer for the 'moving' event state.
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moving_pointer = Pointer('hand')
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text_color = ColorTrait
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# The text displayed in the shape.
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#### 'Private' interface ##################################################
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# The difference between the location of a mouse-click and the component's
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###########################################################################
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# 'Interactor' interface
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###########################################################################
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def normal_key_pressed(self, event):
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""" Event handler. """
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print 'normal_key_pressed', event.character
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def normal_left_down(self, event):
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""" Event handler. """
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if self.is_in(event.x, event.y):
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self.event_state = 'moving'
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event.window.mouse_owner = self
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event.window.set_pointer(self.moving_pointer)
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self._offset_x = event.x - self.x
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self._offset_y = event.y - self.y
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self.container.bring_to_top(self)
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def moving_mouse_move(self, event):
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""" Event handler. """
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self.position = [event.x - self._offset_x, event.y - self._offset_y]
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def moving_left_up(self, event):
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""" Event handler. """
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self.event_state = 'normal'
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event.window.set_pointer(self.normal_pointer)
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event.window.mouse_owner = None
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def moving_mouse_leave(self, event):
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""" Event handler. """
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self.moving_left_up(event)
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###########################################################################
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###########################################################################
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def _get_centre(self):
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""" Property getter. """
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ox, oy = self.position
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def _text_default(self):
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""" Trait initializer. """
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return type(self).__name__
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###########################################################################
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# Protected 'Shape' interface
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###########################################################################
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def _distance_between(self, (x1, y1), (x2, y2)):
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""" Return the distance between two points. """
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return math.sqrt(pow(x1 - x2, 2) + pow(y1 - y2, 2))
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def _draw_text(self, gc):
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""" Draw the shape's text. """
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if len(self.text) > 0:
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gc.set_fill_color(self._get_text_color(self.event_state))
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gc.set_font(Font(family=MODERN, size=16))
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tx, ty, tw, th = gc.get_text_extent(self.text)
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gc.set_text_position(x+(dx-tw)/2, y+(dy-th)/2)
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gc.show_text(self.text)
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def _get_fill_color(self, event_state):
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""" Return the fill color based on the event state. """
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if event_state == 'normal':
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fill_color = self.fill_color_
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r, g, b, a = self.fill_color_
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fill_color = (r, g, b, 0.5)
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def _get_text_color(self, event_state):
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""" Return the text color based on the event state. """
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if event_state == 'normal':
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text_color = self.text_color_
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r, g, b, a = self.text_color_
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text_color = (r, g, b, 0.5)
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#### EOF ######################################################################
added
removed
examples/enable/shapes/shape.py
