Source code for enable.drawing.drag_line
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#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
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""" A drag drawn line. """
from enable.api import Line
from traits.api import Instance
from .drawing_tool import DrawingTool
[docs]class DragLine(DrawingTool):
"""
A drag drawn line. This is not a straight line, but can be a free-form,
curved path.
"""
# Override the vertex color so as to not draw it.
vertex_color = (0.0, 0.0, 0.0, 0.0)
# Because this class subclasses DrawingTool and not Line, it contains
# an instance of the Line primitive.
line = Instance(Line, args=())
# Override the default value of this inherited trait
draw_mode = "overlay"
[docs] def reset(self):
self.line.vertex_color = self.vertex_color
self.line.points = []
self.event_state = "normal"
# ------------------------------------------------------------------------
# "complete" state
# ------------------------------------------------------------------------
[docs] def complete_draw(self, gc):
""" Draw the completed line. """
self.line.line_dash = None
self.line._draw_mainlayer(gc)
# ------------------------------------------------------------------------
# "drawing" state
# ------------------------------------------------------------------------
[docs] def drawing_left_up(self, event):
""" Handle the left mouse button coming up in the 'drawing' state. """
self.event_state = "complete"
event.window.set_pointer("arrow")
self.request_redraw()
self.complete = True
event.handled = True
[docs] def drawing_mouse_move(self, event):
""" Handle the mouse moving in 'drawing' state. """
last_point = self.line.points[-1]
# If we have moved, we need to add a point.
if last_point != (event.x + self.x, event.y - self.y):
self.line.points.append((event.x + self.x, event.y - self.y))
self.request_redraw()
# ------------------------------------------------------------------------
# "normal" state
# ------------------------------------------------------------------------
[docs] def normal_left_down(self, event):
""" Handle the left button down in the 'normal' state. """
self.line.points.append((event.x + self.x, event.y - self.y))
self.event_state = "drawing"
event.window.set_pointer("pencil")
event.handled = True
self.request_redraw()
