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curve.py
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curve.py
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# This file is part of MyPaint.
# Copyright (C) 2007-2011 by Martin Renold <martinxyz@gmx.ch>
# Copyright (C) 2011-2013 by Andrew Chadwick <a.t.chadwick@gmail.com>
# Copyright (C) 2014-2019 by The MyPaint Team
#
# 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 2 of the License, or
# (at your option) any later version.
from __future__ import division, print_function
import logging
from math import pi
from lib.gibindings import Gtk, Gdk
from lib.helpers import clamp
logger = logging.getLogger(__name__)
RADIUS = 2
class CurveWidget(Gtk.DrawingArea):
"""Widget for modifying a (restricted) nonlinear curve.
"""
__gtype_name__ = 'CurveWidget'
_SNAP_TO = tuple(float(n)/100 for n in range(0, 105, 5))
_WHINED_ABOUT_ALPHA = False
def __init__(self, changed_cb=None, magnetic=True, npoints=None,
ylockgroups=()):
Gtk.DrawingArea.__init__(self)
self.points = [(0.0, 0.2), (.25, .5), (.75, .75), (1.0, 1.0)]
self._ylock = {}
self.ylockgroups = ylockgroups
self.maxpoints = None
self._npoints = None
self.npoints = npoints
self.grabbed = None
if changed_cb is None:
self.changed_cb = lambda *a: None
else:
self.changed_cb = changed_cb
self.magnetic = magnetic
self.connect("draw", self.draw_cb)
self.connect("button-press-event", self.button_press_cb)
self.connect("button-release-event", self.button_release_cb)
self.connect("motion-notify-event", self.motion_notify_cb)
self.set_events(Gdk.EventMask.EXPOSURE_MASK |
Gdk.EventMask.BUTTON_PRESS_MASK |
Gdk.EventMask.BUTTON_RELEASE_MASK |
Gdk.EventMask.POINTER_MOTION_MASK
)
self.set_size_request(300, 200)
self.graypoint = None
@property
def npoints(self):
"""If the curve contains a fixed number of points, return that number.
:return: The point count if the count is fixed, otherwise None
:rtype: int | None
"""
return self._npoints
@npoints.setter
def npoints(self, n):
"""Set the number of points for a fixed curve, or disable fixedness.
:param n: The number of points, or None to disable
:type n: int | None
"""
self._npoints = n
self.maxpoints = 64 if not n else n
@property
def ylockgroups(self):
"""Get a copy of the y-lock groups used by the curve.
:return: Dictionary of index-> (i1, i2, ...) associations
:rtype: dict
"""
return {k: w for k, w in self._ylock.items()}
@ylockgroups.setter
def ylockgroups(self, ylockgroups):
"""Set y-lock groups from a list of index tuples.
Each tuple should contain a up a set of indices that represent curve
points that will share the same y-value. When the y-value of one point
in a group is changed, all other points in that same group are changed.
:param ylockgroups: List of tuples of indices
:type ylockgroups: [(int, int, ..)]
"""
self._ylock.clear()
for group in ylockgroups:
for idx in group:
self._ylock[idx] = tuple(i for i in group if i != idx)
def eventpoint(self, event_x, event_y):
width, height = self.get_display_area()
x, y = event_x, event_y
x -= RADIUS
y -= RADIUS
x = x / width
y = y / height
return x, y
def get_display_area(self):
alloc = self.get_allocation()
width, height = alloc.width, alloc.height
width -= 2*RADIUS
height -= 2*RADIUS
width = width / 4 * 4
height = height / 4 * 4
return width, height
def set_point(self, index, value):
y = value[1]
self.points[index] = value
if index in self._ylock:
for locked_to in self._ylock[index]:
self.points[locked_to] = (self.points[locked_to][0], y)
def button_press_cb(self, widget, event):
if not (self.points or event.button == 1):
return
x, y = self.eventpoint(event.x, event.y)
# Note: Squared distance used for comparisons
def dist_squared(p):
return abs(x - p[0])**2 + abs(y - p[1])**2
points = self.points
dsq, pos = min((dist_squared(p), i) for i, p in enumerate(points))
# Unless the number of points are fixed, maxed out, or the intent
# was to move an existing point, insert a new curve point.
if not (self.npoints or dsq <= 0.003 or len(points) >= self.maxpoints):
candidates = [i+1 for i, (px, _) in enumerate(points) if px < x]
insert_pos = candidates and candidates[-1]
if insert_pos and insert_pos < len(points):
points.insert(insert_pos, (x, clamp(y, 0.0, 1.0)))
pos = insert_pos
self.queue_draw()
self.grabbed = pos
def button_release_cb(self, widget, event):
if not event.button == 1:
return
if self.grabbed:
if self.points[self.grabbed] is None:
self.points.pop(self.grabbed)
self.grabbed = None
# notify user of the widget
self.changed_cb(self)
def motion_notify_cb(self, widget, event):
if self.grabbed is None:
return
x, y = self.eventpoint(event.x, event.y)
i = self.grabbed
points = self.points
# XXX this may fail for non contiguous groups.
if i in self._ylock:
i_candidate = None
if x > points[max(self._ylock[i])][0]:
i_candidate = max((i,) + self._ylock[i])
elif x < points[min(self._ylock[i])][0]:
i_candidate = min((i,) + self._ylock[i])
if (i_candidate is not None and
abs(points[i][0] - points[i_candidate][0]) < 0.001):
i = i_candidate
out = False # by default, points cannot be removed
if i == len(points) - 1:
# last point stays right
left_bound = right_bound = 1.0
elif i == 0:
# first point stays left
left_bound = right_bound = 0.0
else:
# other points can be dragged out
left_bound = points[i-1][0]
right_bound = points[i+1][0]
margin = 0.02
inside_x_bounds = left_bound - margin < x < right_bound + margin
inside_y_bounds = -0.1 <= y <= 1.1
out = not (self.npoints or (inside_x_bounds and inside_y_bounds))
if out:
points[i] = None
else:
y = clamp(y, 0.0, 1.0)
if self.magnetic:
x_diff = [abs(x - v) for v in self._SNAP_TO]
y_diff = [abs(y - v) for v in self._SNAP_TO]
if min(x_diff) < 0.015 and min(y_diff) < 0.015:
y = self._SNAP_TO[y_diff.index(min(y_diff))]
x = self._SNAP_TO[x_diff.index(min(x_diff))]
x = clamp(x, left_bound, right_bound)
self.set_point(i, (x, y))
self.queue_draw()
def draw_cb(self, widget, cr):
def gdk2rgb(c):
if c.alpha < 1 and not self.__class__._WHINED_ABOUT_ALPHA:
logger.warning('The GTK3 style is reporting a color with '
'alpha less than 1. This should be harmless, '
'but please report any glitches with the curve '
'widget. Adwaita is thought not to suffer from '
'this problem.')
self.__class__._WHINED_ABOUT_ALPHA = True
return c.red, c.green, c.blue
style = widget.get_style_context()
state = widget.get_state_flags()
fg = gdk2rgb(style.get_color(state))
width, height = self.get_display_area()
if width <= 0 or height <= 0:
return
# 1-pixel width, align lines with pixels
# (but filled rectangles are off by 0.5px now)
cr.translate(0.5, 0.5)
# draw feint grid lines
cr.set_line_width(0.333)
cr.set_source_rgb(*fg)
for i in range(11):
cr.move_to(RADIUS, i*height/10 + RADIUS)
cr.line_to(width + RADIUS, i*height/10 + RADIUS)
cr.move_to(i*width/10 + RADIUS, RADIUS)
cr.line_to(i*width/10 + RADIUS, height + RADIUS)
cr.stroke()
# The graypoint is represented by a dashed vertical line spanning the
# entire graph, with a gap where a circle marks the vertical position.
if self.graypoint:
x1, y1 = self.graypoint
x1 = int(x1*width) + RADIUS
y1 = int(y1*height) + RADIUS
cr.set_line_width(0.5)
cr.set_dash([height/50.0])
cr.move_to(x1, RADIUS)
cr.line_to(x1, y1 - 2 * RADIUS)
cr.move_to(x1, y1 + 2 * RADIUS)
cr.line_to(x1, height + RADIUS)
cr.stroke()
cr.set_dash([])
cr.arc(x1, y1, 2 * RADIUS, 0, 2*pi)
cr.stroke()
# back to regular weight
cr.set_line_width(1.0)
# draw points
prev_x = prev_y = 0
for p in self.points:
if p is None:
continue
current_x = int(p[0] * width) + RADIUS
current_y = int(p[1] * height) + RADIUS
cr.rectangle(
current_x-RADIUS-0.5, current_y-RADIUS-0.5,
2*RADIUS+1, 2*RADIUS+1
)
cr.fill()
# If it's the first point, we won't draw any lines yet
if p is not self.points[0]:
cr.move_to(prev_x, prev_y)
cr.line_to(current_x, current_y)
cr.stroke()
prev_x, prev_y = current_x, current_y
return True
def _test(case=1):
logging.basicConfig()
win = Gtk.Window()
curve = CurveWidget()
if case == 1:
curve.ylockgroups = [(1, 2), (3, 4)]
curve.npoints = 6
curve.points = [
(0., 0.), (.2, .5), (.4, .75), (.6, .5), (.8, .3), (1., 1.)
]
curve.graypoint = (0.5, 0.0)
win.add(curve)
win.set_title("curve test")
win.connect("destroy", lambda *a: Gtk.main_quit())
win.show_all()
Gtk.main()
if __name__ == '__main__':
_test()