# tool_skew.py
#
# Copyright 2018-2023 Romain F. T.
#
# This program 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, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 this program. If not, see .
from gi.repository import Gdk
from .abstract_transform_tool import AbstractCanvasTool
from .optionsbar_skew import OptionsBarSkew
from .utilities_overlay import utilities_show_handles_on_context
class ToolSkew(AbstractCanvasTool):
__gtype_name__ = 'ToolSkew'
def __init__(self, window):
# This is the name of the tool changing rectangles into parallelograms.
# It's synonymous with tilt, slant, bend. If you need a reference to
# translate it, this is named after MS Paint's "Stretch/Skew" dialog.
super().__init__('skew', _("Skew"), 'tool-skew-symbolic', window)
self._x = 0
self._y = 0
self.add_tool_action_simple('skew-exists', self.select_flowbox_child)
self.add_tool_action_enum('crop-expand', 'initial')
def try_build_pane(self):
self.pane_id = 'skew'
self.window.options_manager.try_add_bottom_pane(self.pane_id, self)
def build_bottom_pane(self):
bar = OptionsBarSkew()
self.yx_spinbtn = bar.yx_spinbtn
self.xy_spinbtn = bar.xy_spinbtn
self.yx_spinbtn.connect('value-changed', self.on_coord_changed)
self.xy_spinbtn.connect('value-changed', self.on_coord_changed)
return bar
def get_options_model(self):
if self.apply_to_selection:
return None
else:
return super().get_options_model()
def get_options_label(self):
if self.apply_to_selection:
return super().get_options_label()
else:
return _("Skewing options")
def get_editing_tips(self):
label_direction = _("The directions of the deformation are hinted by the mouse pointer")
label_modifiers = None
if self.apply_to_selection:
label_action = _("Skewing the selection")
label_confirm = None
else:
label_action = _("Skewing the canvas")
label_confirm = self.label + " - " + \
_("Don't forget to confirm the operation!")
if not self.get_image().get_mouse_is_pressed():
label_modifiers = _("Press , , or both, to " + \
"quickly change the 'expand with' option")
full_list = [label_action, label_direction, label_confirm, label_modifiers]
return list(filter(None, full_list))
def on_tool_selected(self, *args):
super().on_tool_selected()
self.set_action_sensitivity('crop-expand', not self.apply_to_selection)
self._reset_values()
############################################################################
def get_yx(self):
return self.yx_spinbtn.get_value_as_int()
def get_xy(self):
return self.xy_spinbtn.get_value_as_int()
def _set_cursor_name(self):
if self._directions == '':
self.cursor_name = 'not-allowed'
return
if self._directions == 'nw' or self._directions == 'se':
self.cursor_name = 'nwse-resize'
elif self._directions == 'ne' or self._directions == 'sw':
self.cursor_name = 'nesw-resize'
elif self._directions == 'n' or self._directions == 's':
self.cursor_name = 'ew-resize'
elif self._directions == 'e' or self._directions == 'w':
self.cursor_name = 'ns-resize'
def _get_width(self):
if self.apply_to_selection:
source_pixbuf = self.get_selection_pixbuf()
else:
source_pixbuf = self.get_main_pixbuf()
return source_pixbuf.get_width()
def _get_height(self):
if self.apply_to_selection:
source_pixbuf = self.get_selection_pixbuf()
else:
source_pixbuf = self.get_main_pixbuf()
return source_pixbuf.get_height()
def on_coord_changed(self, *args):
self.build_and_do_op()
def _reset_values(self, *args):
self._update_expansion_rgba()
self._yx = 0 # vertical deformation
self._xy = 0 # horizontal deformation
self.yx_spinbtn.set_value(0)
self.xy_spinbtn.set_value(0)
self.build_and_do_op()
############################################################################
def on_unclicked_motion_on_area(self, event, surface):
self.set_directional_cursor(event.x, event.y)
def on_press_on_area(self, event, surface, event_x, event_y):
self.x_press = event_x
self.y_press = event_y
self._yx = self.get_yx() # vertical deformation
self._xy = self.get_xy() # horizontal deformation
# TODO répliquer ce que fait le scale avec son x2/y2 qui évite un effet
# flamby dégueulasse lié aux arrondis ?
self._update_expansion_rgba(event.button)
self.update_modifier_state(event.state)
if 'SHIFT' in self._modifier_keys and 'ALT' in self._modifier_keys:
self._force_expansion_rgba('secondary', event.button)
elif 'SHIFT' in self._modifier_keys:
self._force_expansion_rgba('alpha')
elif 'ALT' in self._modifier_keys:
self._force_expansion_rgba('initial')
def on_motion_on_area(self, event, surface, event_x, event_y, render=True):
if self._directions == '' or not render:
return
delta_x = event_x - self.x_press
delta_y = event_y - self.y_press
yx = self._yx
xy = self._xy
if 'n' in self._directions:
xy -= 100 * delta_x/self._get_width()
if 's' in self._directions:
xy += 100 * delta_x/self._get_width()
if 'w' in self._directions:
yx -= 100 * delta_y/self._get_height()
if 'e' in self._directions:
yx += 100 * delta_y/self._get_height()
self.yx_spinbtn.set_value(yx)
self.xy_spinbtn.set_value(xy)
def on_release_on_area(self, event, surface, event_x, event_y):
self.on_motion_on_area(event, surface, event_x, event_y)
self.build_and_do_op() # technically already done
############################################################################
def on_draw_above(self, area, cairo_context):
x1 = 0
y1 = 0
scaled_xy = abs(self.get_xy()) * (self._get_height() / self._get_width())
scaled_yx = abs(self.get_yx()) * (self._get_width() / self._get_height())
p_xy = (scaled_xy + 100) / 100
p_yx = (scaled_yx + 100) / 100
x2 = x1 + self._get_width() * p_xy
y2 = y1 + self._get_height() * p_yx
x1, x2, y1, y2 = self.get_image().get_corrected_coords(x1, x2, y1, y2, \
self.apply_to_selection, False)
self._draw_temp_pixbuf(cairo_context, x1, y1)
thickness = self.get_overlay_thickness()
utilities_show_handles_on_context(cairo_context, x1, x2, y1, y2, thickness)
############################################################################
def build_operation(self):
operation = {
'tool_id': self.id,
'is_selection': self.apply_to_selection,
'is_preview': True,
'local_dx': 0,
'local_dy': 0,
'yx': self.yx_spinbtn.get_value_as_int()/100,
'xy': self.xy_spinbtn.get_value_as_int()/100,
'rgba': self._expansion_rgba,
}
return operation
def do_tool_operation(self, operation):
self.start_tool_operation(operation)
if operation['is_selection']:
source_pixbuf = self.get_selection_pixbuf()
prefill = False
else:
source_pixbuf = self.get_main_pixbuf()
prefill = True
source_surface = Gdk.cairo_surface_create_from_pixbuf(source_pixbuf, 0, None)
source_surface.set_device_scale(self.scale_factor(), self.scale_factor())
xy = operation['xy']
x0 = 0.0
if xy < 0:
x0 = int(-1 * xy * source_surface.get_height())
yx = operation['yx']
y0 = 0.0
if yx < 0:
y0 = int(-1 * yx * source_surface.get_width())
coefs = [1.0, yx, xy, 1.0, x0, y0]
new_surface = self.get_deformed_surface(source_surface, coefs, prefill)
new_pixbuf = Gdk.pixbuf_get_from_surface(new_surface, 0, 0, \
new_surface.get_width(), new_surface.get_height())
self.get_image().set_temp_pixbuf(new_pixbuf)
self.common_end_operation(operation)
############################################################################
################################################################################