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|
# -*- coding: utf-8 -*-
"""
@namespace Desenho
Pixmap manipulation
Copyright 2007, NATE-LSI-EPUSP
Oficina is developed in Brazil at Escola Politécnica of
Universidade de São Paulo. NATE is part of LSI (Integrable
Systems Laboratory) and stands for Learning, Work and Entertainment
Research Group. Visit our web page:
www.lsi.usp.br/nate
Suggestions, bugs and doubts, please email oficina@lsi.usp.br
Oficina is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation version 2 of
the License.
Oficina is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public
License along with Oficina; if not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
Boston, MA 02110-1301 USA.
The copy of the GNU General Public License is found in the
COPYING file included in the source distribution.
Authors:
Joyce Alessandra Saul (joycealess@gmail.com)
Andre Mossinato (andremossinato@gmail.com)
Nathalia Sautchuk Patrício (nathalia.sautchuk@gmail.com)
Pedro Kayatt (pekayatt@gmail.com)
Rafael Barbolo Lopes (barbolo@gmail.com)
Alexandre A. Gonçalves Martinazzo (alexandremartinazzo@gmail.com)
Colaborators:
Bruno Gola (brunogola@gmail.com)
Group Manager:
Irene Karaguilla Ficheman (irene@lsi.usp.br)
Cientific Coordinator:
Roseli de Deus Lopes (roseli@lsi.usp.br)
UI Design (OLPC):
Eben Eliason (eben@laptop.org)
Project Coordinator (OLPC):
Manusheel Gupta (manu@laptop.org)
Project Advisor (OLPC):
Walter Bender (walter@laptop.org)
"""
from gi.repository import Gdk
from gi.repository import GObject
from gi.repository import PangoCairo
import logging
import math
import cairo
RESIZE_DELAY = 500 # The time to wait for the resize operation to be
# executed, after the resize controls are pressed.
##Pixmap manipulation
class Desenho:
def __init__(self, widget):
"""Initialize Desenho object.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
"""
self._resize_timer = None
self._rainbow_color_list = ['#ff0000', # red
'#ff8000', # orange
'#ffff00', # yellow
'#80ff00', # lime
'#00ff00', # green
'#00ff80', # green water
'#00ffff', # light blue
'#007fff', # almost blue
'#0000ff', # blue
'#8000ff', # indigo
'#ff00ff', # pink violet
'#ff0080'] # violet
self._rainbow_counter = 0
self.points = []
self._last_points_used = []
self._last_point_drawn_index = 0
def clear_control_points(self):
self._last_points_used = []
def line(self, widget, coords, temp):
"""Draw line.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
"""
if temp == True:
ctx = widget.temp_ctx
else:
ctx = widget.drawing_ctx
ctx.save()
ctx.new_path()
ctx.set_line_width(widget.tool['line size'])
ctx.set_line_cap(cairo.LINE_CAP_ROUND)
ctx.set_source_rgba(*widget.tool['cairo_stroke_color'])
ctx.move_to(widget.oldx, widget.oldy)
ctx.line_to(coords[0], coords[1])
ctx.stroke()
ctx.restore()
# TODO: clip
widget.queue_draw()
def eraser(self, widget, coords, last):
"""Erase part of the drawing.
@param self -- Desenho.Desenho instance
@param last -- last of oldx
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param size -- integer (default 30)
@param shape -- string (default 'circle')
"""
self._trace(widget, coords, last)
def brush(self, widget, coords, last):
"""Paint with brush.
@param self -- Desenho.Desenho instance
@param last -- last of oldx
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param size -- integer (default 30)
@param shape -- string (default 'circle')
"""
self._trace(widget, coords, last)
def stamp(self, widget, coords, last, stamp_size=20):
"""Paint with stamp.
@param self -- Desenho.Desenho instance
@param last -- last of oldx
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param stamp_size -- integer (default 20)
"""
widget.desenha = False
width = widget.resized_stamp.get_width()
height = widget.resized_stamp.get_height()
dx = coords[0] - width / 2
dy = coords[1] - height / 2
widget.drawing_ctx.save()
widget.drawing_ctx.translate(dx, dy)
widget.drawing_ctx.rectangle(dx, dy, width, height)
Gdk.cairo_set_source_pixbuf(widget.drawing_ctx, widget.resized_stamp,
0, 0)
widget.drawing_ctx.paint()
widget.drawing_ctx.restore()
widget.queue_draw_area(dx, dy, width, height)
def rainbow(self, widget, coords, last):
"""Paint with rainbow.
@param self -- Desenho.Desenho instance
@param last -- last of oldx
@param widget -- Area object (GtkDrawingArea)
@param color -- select the color adress
@param coords -- Two value tuple
@param size -- integer (default 30)
@param shape -- string (default 'circle')
"""
_color_str = self._rainbow_color_list[self._rainbow_counter]
_color = Gdk.color_parse(_color_str)
self._rainbow_counter += 1
if self._rainbow_counter > 11:
self._rainbow_counter = 0
widget.drawing_ctx.set_source_rgba(_color.red, _color.green,
_color.blue, 0.3)
self._old_trace(widget, coords, last)
def _old_trace(self, widget, coords, last):
"""
_old_trace is used only by rainbow
"""
widget.desenha = False
size = widget.tool['line size']
shape = widget.tool['line shape']
if shape == 'circle':
if last:
widget.drawing_ctx.set_line_width(size)
widget.drawing_ctx.set_line_cap(cairo.LINE_CAP_ROUND)
widget.drawing_ctx.set_line_join(cairo.LINE_JOIN_ROUND)
widget.drawing_ctx.move_to(last[0], last[1])
widget.drawing_ctx.line_to(coords[0], coords[1])
widget.drawing_ctx.stroke()
else:
widget.drawing_ctx.move_to(coords[0],
coords[1])
widget.drawing_ctx.arc(coords[0], coords[1],
size / 2, 0., 2 * math.pi)
widget.drawing_ctx.fill()
elif shape == 'square':
if last:
points = [(last[0] - size / 2, last[1] - size / 2),
(coords[0] - size / 2, coords[1] - size / 2),
(coords[0] + size / 2, coords[1] + size / 2),
(last[0] + size / 2, last[1] + size / 2)]
for point in points:
widget.drawing_ctx.line_to(*point)
widget.drawing_ctx.fill()
points = [(last[0] + size / 2, last[1] - size / 2),
(coords[0] + size / 2, coords[1] - size / 2),
(coords[0] - size / 2, coords[1] + size / 2),
(last[0] - size / 2, last[1] + size / 2)]
for point in points:
widget.drawing_ctx.line_to(*point)
widget.drawing_ctx.fill()
else:
widget.drawing_ctx.move_to(coords[0] - size / 2,
coords[1] - size / 2)
widget.drawing_ctx.rectangle(coords[0] - size / 2,
coords[1] - size / 2, size, size)
widget.drawing_ctx.fill()
if last:
x = min(coords[0], last[0])
width = max(coords[0], last[0]) - x
y = min(coords[1], last[1])
height = max(coords[1], last[1]) - y
# We add size to avoid drawing dotted lines
widget.queue_draw_area(x - size, y - size,
width + size * 2, height + size * 2)
else:
widget.queue_draw()
def finish_trace(self, widget):
widget.desenha = False
shape = widget.tool['line shape']
rounded = (shape == 'circle')
self._draw_polygon(widget, False, False, self.points, False, rounded)
if not rounded and len(self.points) == 1:
# draw a square if the mouse was not moved
size = widget.tool['line size']
coords = self.points[0]
widget.drawing_ctx.save()
if widget.tool['name'] == 'eraser':
color = (1.0, 1.0, 1.0, 1.0)
else:
color = widget.tool['cairo_stroke_color']
widget.drawing_ctx.set_source_rgba(*color)
widget.drawing_ctx.move_to(coords[0] - size / 2,
coords[1] - size / 2)
widget.drawing_ctx.rectangle(coords[0] - size / 2,
coords[1] - size / 2, size, size)
widget.drawing_ctx.fill()
widget.drawing_ctx.restore()
self.points = []
self._last_point_drawn_index = 0
def _trace(self, widget, coords, last):
widget.desenha = True
size = widget.tool['line size']
shape = widget.tool['line shape']
rounded = (shape == 'circle')
self.points.append((coords[0], coords[1]))
if last:
self._draw_polygon(widget, True, False, self.points, False,
rounded)
self.clear_control_points()
if last:
x = min(coords[0], last[0])
width = max(coords[0], last[0]) - x
y = min(coords[1], last[1])
height = max(coords[1], last[1]) - y
# We add size to avoid drawing dotted lines
widget.queue_draw_area(x - size, y - size,
width + size * 2, height + size * 2)
def square(self, widget, coords, temp, fill):
"""Draw a square.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param temp -- switch between drawing context and temp context
@param fill -- Fill object
"""
x, y, dx, dy, = self.adjust(widget, coords)
points = [(x, y), (x + dx, y), (x + dx, y + dy), (x, y + dy)]
self._draw_polygon(widget, temp, fill, points)
def _draw_polygon(self, widget, temp, fill, points, closed=True,
rounded=False):
if not points:
return
if temp == True:
ctx = widget.temp_ctx
else:
ctx = widget.drawing_ctx
ctx.save()
ctx.new_path()
ctx.move_to(*points[0])
for point in points:
ctx.line_to(*point)
if closed:
ctx.close_path()
if rounded:
ctx.set_line_cap(cairo.LINE_CAP_ROUND)
ctx.set_line_join(cairo.LINE_JOIN_ROUND)
else:
ctx.set_line_cap(cairo.LINE_CAP_SQUARE)
ctx.set_line_join(cairo.LINE_JOIN_MITER)
if fill:
ctx.set_source_rgba(*widget.tool['cairo_fill_color'])
ctx.set_line_width(0)
ctx.fill_preserve()
if widget.tool['name'] == 'eraser':
ctx.set_source_rgba(1.0, 1.0, 1.0, 1.0)
else:
ctx.set_source_rgba(*widget.tool['cairo_stroke_color'])
ctx.set_line_width(widget.tool['line size'])
ctx.stroke()
ctx.restore()
if fill or closed:
self._last_points_used.extend(points)
area = widget.calculate_damaged_area(self._last_points_used)
widget.queue_draw_area(*area)
else:
# if is a open line and is not filled (like when using the pencil)
# we don't need draw all the poligon, can draw only the part
# from the last queue update until now
self._last_points_used = points[self._last_point_drawn_index:]
if self._last_points_used:
area = widget.calculate_damaged_area(self._last_points_used)
self._last_point_drawn_index = len(points)
widget.queue_draw_area(*area)
def triangle(self, widget, coords, temp, fill):
"""Draw a triangle.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param temp -- switch between drawing context and temp context
@param fill -- Fill object
"""
points = [(widget.oldx, widget.oldy),
(widget.oldx + int((coords[0] - widget.oldx) / 2), coords[1]),
(coords[0], widget.oldy)]
self._draw_polygon(widget, temp, fill, points)
def trapezoid(self, widget, coords, temp, fill):
"""Draw a trapezoid.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param temp -- switch between context and temp context
@param fill -- Fill object
"""
dif = int((coords[0] - widget.oldx) / 4)
points = [(widget.oldx, widget.oldy), (widget.oldx + dif, coords[1]),
(coords[0] - dif, coords[1]), (coords[0], widget.oldy)]
self._draw_polygon(widget, temp, fill, points)
def arrow(self, widget, coords, temp, fill):
"""Draw a arrow.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param temp -- switch between context and temp context
@param fill -- Fill object
"""
x = coords[0] - widget.oldx
y = coords[1] - widget.oldy
A = math.atan2(y, x)
dA = 2 * math.pi / 2
r = math.hypot(y, x)
p = [(widget.oldx, widget.oldy)]
p.append((widget.oldx + int(r * math.cos(A)),
widget.oldy + int(r * math.sin(A))))
p.append((widget.oldx + int(0.74 * r * math.cos(A + dA / 6)),
widget.oldy + int(0.74 * r * math.sin(A + dA / 6))))
p.append((widget.oldx + int(2 * r * math.cos(A + dA / 6 + dA / 20)),
widget.oldy + int(2 * r * math.sin(A + dA / 6 + dA / 20))))
p.append((widget.oldx +\
int(2 * r * math.cos(A + dA / 6 - dA / 20 + dA / 6)), \
widget.oldy +\
int(2 * r * math.sin(A + dA / 6 - dA / 20 + dA / 6))))
p.append((widget.oldx + int(0.74 * r * math.cos(A + dA / 6 + dA / 6)),
widget.oldy + int(0.74 * r * math.sin(A + dA / 6 + dA / 6))))
p.append((widget.oldx + int(r * math.cos(A + dA / 2)),
widget.oldy + int(r * math.sin(A + dA / 2))))
self._draw_polygon(widget, temp, fill, p)
def parallelogram(self, widget, coords, temp, fill):
"""Draw a parallelogram.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param temp -- switch between context and temp context
@param fill -- Fill object
"""
x = int((coords[0] - widget.oldx) / 4)
points = [(widget.oldx, widget.oldy), (coords[0] - x, widget.oldy),
(coords[0], coords[1]), (widget.oldx + x, coords[1])]
self._draw_polygon(widget, temp, fill, points)
def star(self, widget, coords, n, temp, fill):
"""Draw polygon with n sides.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param n -- number of sides
@param temp -- switch between context and temp context
@param fill -- Fill object
"""
x = coords[0] - widget.oldx
y = coords[1] - widget.oldy
A = math.atan2(y, x)
dA = 2 * math.pi / n
r = math.hypot(y, x)
p = [(widget.oldx + int(r * math.cos(A)), \
widget.oldy + int(r * math.sin(A))), \
(widget.oldx + int(0.4 * r * math.cos(A + dA / 2)),
widget.oldy + int(0.4 * r * math.sin(A + dA / 2)))]
for _i in range(int(n) - 1):
A = A + dA
p.append((widget.oldx + int(r * math.cos(A)), \
widget.oldy + int(r * math.sin(A))))
p.append((widget.oldx + int(0.4 * r * math.cos(A + dA / 2)), \
widget.oldy + int(0.4 * r * math.sin(A + dA / 2))))
self._draw_polygon(widget, temp, fill, p)
def polygon_regular(self, widget, coords, n, temp, fill):
"""Draw polygon with n sides.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param n -- number of sides
@param temp -- switch between context and temp context
@param fill -- Fill object
"""
x = coords[0] - widget.oldx
y = coords[1] - widget.oldy
A = math.atan2(y, x)
dA = 2 * math.pi / n
r = math.hypot(y, x)
p = [(widget.oldx + int(r * math.cos(A)), \
widget.oldy + int(r * math.sin(A)))]
for _i in range(int(n) - 1):
A = A + dA
p.append((widget.oldx + int(r * math.cos(A)), \
widget.oldy + int(r * math.sin(A))))
self._draw_polygon(widget, temp, fill, p)
def heart(self, widget, coords, temp, fill):
"""Draw polygon with n sides.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param temp -- switch between context and temp context
@param fill -- Fill object
"""
if temp == True:
ctx = widget.temp_ctx
else:
ctx = widget.drawing_ctx
dy = math.fabs(coords[1] - widget.oldy)
r = math.hypot(dy, dy)
w = r / 10.0
if w == 0:
# non invertible cairo matrix
return
ctx.set_line_width(widget.tool['line size'])
line_width = ctx.get_line_width()
ctx.save()
ctx.new_path()
ctx.translate(widget.oldx, widget.oldy)
ctx.scale(w, w)
ctx.move_to(0, 0)
ctx.curve_to(0, -30, -50, -30, -50, 0)
ctx.curve_to(-50, 30, 0, 35, 0, 60)
ctx.curve_to(0, 35, 50, 30, 50, 0)
ctx.curve_to(50, -30, 0, -30, 0, 0)
ctx.set_line_width(line_width / w)
if fill:
ctx.set_source_rgba(*widget.tool['cairo_fill_color'])
ctx.fill_preserve()
ctx.set_source_rgba(*widget.tool['cairo_stroke_color'])
ctx.stroke()
ctx.restore()
# TODO: clip
widget.queue_draw()
def circle(self, widget, coords, temp, fill):
"""Draw a circle.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param temp -- switch between context and temp context
@param fill -- Fill object
"""
if temp == True:
ctx = widget.temp_ctx
else:
ctx = widget.drawing_ctx
x, y, dx, dy = self.adjust(widget, coords)
if dx == 0 or dy == 0:
# scale by 0 gives error
return
ctx.set_line_width(widget.tool['line size'])
line_width = ctx.get_line_width()
ctx.save()
ctx.new_path()
ctx.translate(x, y)
ctx.scale(dx, dy)
ctx.arc(0., 0., 1., 0., 2 * math.pi)
ctx.set_line_width(line_width / float(min(dx, dy)))
if fill:
ctx.set_source_rgba(*widget.tool['cairo_fill_color'])
ctx.fill_preserve()
ctx.set_source_rgba(*widget.tool['cairo_stroke_color'])
ctx.stroke()
ctx.restore()
# TODO: clip
widget.queue_draw()
def clear(self, widget):
"""Clear the drawing.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
"""
logging.debug('Desenho.clear')
widget.desenha = False
widget.textos = []
x, y = 0, 0
width, height = widget.get_size()
# try to clear a selected area first
if widget.is_selected():
x, y, width, height = widget.get_selection_bounds()
widget.drawing_ctx.rectangle(x, y, width, height)
widget.drawing_ctx.set_source_rgb(1.0, 1.0, 1.0)
widget.drawing_ctx.fill()
widget.queue_draw()
def text(self, widget, coord_x, coord_y):
"""Display and draw text in the drawing area.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coord_x
@param coord_y
"""
if not widget.text_in_progress:
widget.text_in_progress = True
widget.activity.move_textview(coord_x, coord_y)
widget.activity.textview.show()
widget.activity.textview.grab_focus()
else:
widget.text_in_progress = False
buf = widget.activity.textview.get_buffer()
start, end = buf.get_bounds()
text = buf.get_text(start, end, True)
textview = widget.activity.textview
tv_layout = textview.create_pango_layout(text)
ctx = widget.drawing_ctx
ctx.save()
ctx.new_path()
ctx.set_source_rgba(*widget.tool['cairo_stroke_color'])
pango_layout = PangoCairo.create_layout(ctx)
pango_layout.set_font_description(widget.get_font_description())
pango_layout.set_text(unicode(text), len(unicode(text)))
tv_alloc = textview.get_allocation()
ctx.move_to(tv_alloc.x, tv_alloc.y)
PangoCairo.show_layout(ctx, pango_layout)
ctx.stroke()
ctx.restore()
widget.activity.textview.hide()
widget.drawing_canvas.flush()
try:
widget.activity.textview.set_text('')
except AttributeError:
buf.set_text('')
widget.enable_undo()
# TODO: clip
widget.queue_draw()
def selection(self, widget, coords):
"""Make a selection.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
"""
x, y, dx, dy = self.adjust(widget, coords, True)
widget.set_selection_bounds(x, y, dx, dy)
# TODO: clip
widget.queue_draw()
def move_selection(self, widget, coords):
"""Move the selection.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param mvcopy -- Copy or Move
@param pixbuf_copy -- For import image
"""
widget.desenha = True
dx = int(coords[0] - widget.oldx)
dy = int(coords[1] - widget.oldy)
x, y, width, height = widget.get_selection_bounds()
if widget.pending_clean_selection_background:
# clear the selection background
widget.clear_selection_background()
widget.pending_clean_selection_background = False
selection_surface = widget.get_selection()
widget.oldx = coords[0]
widget.oldy = coords[1]
new_x, new_y = x + dx, y + dy
widget.set_selection_start(new_x, new_y)
widget.queue_draw()
def resize_selection(self, widget, coords):
"""Move the selection.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param mvcopy -- Copy or Move
@param pixbuf_copy -- For import image
"""
dx = int(coords[0] - widget.oldx)
dy = int(coords[1] - widget.oldy)
sel_width = widget.selection_surface.get_width()
sel_height = widget.selection_surface.get_height()
if widget.pending_clean_selection_background:
# clear the selection background
widget.clear_selection_background()
widget.pending_clean_selection_background = False
width_scale = float(sel_width + dx) / float(sel_width)
height_scale = float(sel_height + dy) / float(sel_height)
if width_scale < 0 or height_scale < 0:
return
widget.resize_selection_surface(width_scale, height_scale)
def freeform(self, widget, coords, temp, fill, param=None):
"""Draw polygon.
@param self -- Desenho.Desenho instance
@param widget -- Area object (GtkDrawingArea)
@param coords -- Two value tuple
@param temp -- switch between drawing context and temp context
@param fill -- Fill object
"""
if param == "moving":
# mouse not pressed moving
if self.points:
if widget.last:
self.points.append((coords[0], coords[1]))
widget.last = []
else:
self.points[-1] = (coords[0], coords[1])
elif param == "motion":
# when mousepress or mousemove
if widget.last:
self.points.append((widget.last[0], widget.last[1]))
self.points.append((coords[0], coords[1]))
else:
self.points.append((widget.oldx, widget.oldy))
self.points.append((coords[0], coords[1]))
widget.last = coords
elif param == "release":
if len(self.points) > 2:
first = self.points[0]
dx = coords[0] - first[0]
dy = coords[1] - first[1]
d = math.hypot(dx, dy)
if d > 20:
widget.last = coords
self.points.append(coords)
else:
# close the polygon
self.points.append((first[0], first[1]))
# set the last point index to zero to force draw all
# the polygon
self._last_point_drawn_index = 0
self._draw_polygon(widget, False, fill, self.points)
widget.desenha = False
widget.last = []
self.points = []
widget.enable_undo()
return
widget.desenha = True
if self.points:
# Draw a circle to show where the freeform start/finish
ctx = widget.temp_ctx
ctx.save()
x_init, y_init = self.points[0]
ctx.new_path()
ctx.translate(x_init, y_init)
ctx.set_line_width(1)
ctx.set_source_rgba(1., 1., 1., 1.)
ctx.set_line_cap(cairo.LINE_CAP_ROUND)
ctx.set_line_join(cairo.LINE_JOIN_ROUND)
ctx.arc(0, 0, 20, 0., 2 * math.pi)
ctx.stroke_preserve()
ctx.set_dash([5, 5], 0)
ctx.set_source_rgba(0., 0., 0., 1.)
ctx.stroke()
ctx.restore()
# Display the polygon open in the temp canvas
self._draw_polygon(widget, True, False, self.points, closed=False)
self.clear_control_points()
def adjust(self, widget, coords, locked=False):
width, height = widget.get_size()
if widget.oldx > int(coords[0]):
xi = int(coords[0])
xf = widget.oldx
else:
xi = widget.oldx
xf = int(coords[0])
if widget.oldy > int(coords[1]):
yi = int(coords[1])
yf = widget.oldy
else:
yi = widget.oldy
yf = int(coords[1])
if locked == True:
if xi < 0:
xi = 0
if yi < 0:
yi = 0
if xf > width:
xf = width
if yf > height:
yf = height
dx = xf - xi
dy = yf - yi
return xi, yi, dx, dy
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