/usr/lib/python2.7/dist-packages/ginga/canvas/types/mixins.py is in python-ginga 2.6.1-2.
This file is owned by root:root, with mode 0o644.
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# mixins.py -- classes for basic shapes drawn on ginga canvases.
#
# This is open-source software licensed under a BSD license.
# Please see the file LICENSE.txt for details.
#
import math
import numpy
from ginga.canvas.CanvasObject import (CanvasObjectBase, Point,
MovePoint, ScalePoint, RotatePoint)
from ginga import trcalc
from ginga.util.six.moves import map
#
# ==== MIXIN CLASSES FOR BASE OBJECTS ====
#
class OnePointMixin(object):
def __get_points(self):
return numpy.asarray([(self.x, self.y)])
def __set_points(self, pts):
pts = numpy.asarray(pts)
self.x, self.y = pts[0, 0], pts[0, 1]
points = property(__get_points, __set_points)
def get_center_pt(self):
points = self.get_data_points(points=[(self.x, self.y)])
return points[0]
def setup_edit(self, detail):
detail.center_pos = self.get_center_pt()
detail.points = self.get_data_points()
def set_edit_point(self, i, pt, detail):
if i == 0:
x, y = pt
self.move_to(x, y)
else:
raise ValueError("No point corresponding to index %d" % (i))
def get_edit_points(self, viewer):
return [MovePoint(*self.get_center_pt())]
def get_llur(self):
x, y = self.crdmap.to_data(self.x, self.y)
return (x-0.5, y-0.5, x+0.5, y+0.5)
def rotate_by(self, theta_deg):
pass
def scale_by(self, scale_x, scale_y):
pass
class TwoPointMixin(object):
def __get_points(self):
return numpy.asarray([(self.x1, self.y1), (self.x2, self.y2)])
def __set_points(self, pts):
pts = numpy.asarray(pts)
self.x1, self.y1 = pts[0, 0], pts[0, 1]
self.x2, self.y2 = pts[1, 0], pts[1, 1]
points = property(__get_points, __set_points)
def get_point_by_index(self, i):
return self.points[i]
def get_center_pt(self):
points = self.get_data_points(points=[
((self.x1 + self.x2) / 2., (self.y1 + self.y2) / 2.),
])
return points[0]
def set_edit_point(self, i, pt, detail):
if i == 0:
x, y = pt
self.move_to(x, y)
elif i in (1, 2):
self.set_point_by_index(i-1, pt)
elif i == 3:
scalef = self.calc_scale_from_pt(pt, detail)
self.rescale_by(scalef, scalef, detail)
elif i == 4:
delta_deg = self.calc_rotation_from_pt(pt, detail)
self.rerotate_by(delta_deg, detail)
else:
raise ValueError("No point corresponding to index %d" % (i))
def get_edit_points(self, viewer):
move_pt, scale_pt, rotate_pt = self.get_move_scale_rotate_pts(viewer)
points = self.get_data_points()
return [move_pt,
Point(*points[0]),
Point(*points[1]),
scale_pt,
rotate_pt,
]
def setup_edit(self, detail):
detail.center_pos = self.get_center_pt()
detail.points = self.get_data_points()
def get_llur(self):
points = self.get_data_points()
x1, y1 = points[0]
x2, y2 = points[1]
return self.swapxy(x1, y1, x2, y2)
class OnePointOneRadiusMixin(OnePointMixin):
def __init__(self):
OnePointMixin.__init__(self)
def set_edit_point(self, i, pt, detail):
if i == 0:
x, y = pt
self.move_to(x, y)
elif i == 1:
scalef = self.calc_scale_from_pt(pt, detail)
self.radius = detail.radius * scalef
elif i == 2:
delta_deg = self.calc_rotation_from_pt(pt, detail)
self.rotate_by(delta_deg)
else:
raise ValueError("No point corresponding to index %d" % (i))
def get_edit_points(self, viewer):
move_pt, scale_pt, rotate_pt = self.get_move_scale_rotate_pts(viewer)
points = self.get_data_points(points=(
self.crdmap.offset_pt((self.x, self.y), self.radius, 0),
))
return [move_pt,
ScalePoint(*points[0]),
rotate_pt,
]
def setup_edit(self, detail):
detail.center_pos = self.get_center_pt()
detail.radius = self.radius
detail.points = numpy.array(self.get_data_points())
def get_llur(self):
points = (self.crdmap.offset_pt((self.x, self.y),
-self.radius, -self.radius),
self.crdmap.offset_pt((self.x, self.y),
self.radius, -self.radius),
self.crdmap.offset_pt((self.x, self.y),
self.radius, self.radius),
self.crdmap.offset_pt((self.x, self.y),
-self.radius, self.radius))
mpts = numpy.asarray(self.get_data_points(points=points))
if hasattr(self, 'rot_deg'):
xd, yd = self.crdmap.to_data(self.x, self.y)
mpts = trcalc.rotate_coord(mpts, self.rot_deg, [xd, yd])
t_ = mpts.T
x1, y1 = t_[0].min(), t_[1].min()
x2, y2 = t_[0].max(), t_[1].max()
return (x1, y1, x2, y2)
def rotate_by(self, theta_deg):
pass
def scale_by(self, scale_x, scale_y):
self.radius *= max(scale_x, scale_y)
class OnePointTwoRadiusMixin(OnePointMixin):
def __init__(self):
OnePointMixin.__init__(self)
def set_edit_point(self, i, pt, detail):
if i == 0:
x, y = pt
self.move_to(x, y)
elif i == 1:
scale_x, scale_y = self.calc_dual_scale_from_pt(pt, detail)
self.xradius = detail.xradius * scale_x
elif i == 2:
scale_x, scale_y = self.calc_dual_scale_from_pt(pt, detail)
self.yradius = detail.yradius * scale_y
elif i == 3:
scale_x, scale_y = self.calc_dual_scale_from_pt(pt, detail)
self.xradius = detail.xradius * scale_x
self.yradius = detail.yradius * scale_y
elif i == 4:
scalef = self.calc_scale_from_pt(pt, detail)
self.xradius = detail.xradius * scalef
self.yradius = detail.yradius * scalef
elif i == 5:
delta_deg = self.calc_rotation_from_pt(pt, detail)
self.rotate_by(delta_deg)
else:
raise ValueError("No point corresponding to index %d" % (i))
def get_edit_points(self, viewer):
move_pt, scale_pt, rotate_pt = self.get_move_scale_rotate_pts(viewer)
points = (self.crdmap.offset_pt((self.x, self.y),
self.xradius, 0),
self.crdmap.offset_pt((self.x, self.y),
0, self.yradius),
self.crdmap.offset_pt((self.x, self.y),
self.xradius, self.yradius),
)
points = self.get_data_points(points=points)
return [move_pt, # location
Point(*points[0]), # adj xradius
Point(*points[1]), # adj yradius
Point(*points[2]), # adj both
scale_pt,
rotate_pt,
]
def setup_edit(self, detail):
detail.center_pos = self.get_center_pt()
detail.xradius = self.xradius
detail.yradius = self.yradius
detail.points = self.get_data_points()
def rotate_by(self, theta_deg):
new_rot = math.fmod(self.rot_deg + theta_deg, 360.0)
self.rot_deg = new_rot
return new_rot
def scale_by(self, scale_x, scale_y):
self.xradius *= scale_x
self.yradius *= scale_y
def get_llur(self):
points = (self.crdmap.offset_pt((self.x, self.y),
-self.xradius, -self.yradius),
self.crdmap.offset_pt((self.x, self.y),
self.xradius, -self.yradius),
self.crdmap.offset_pt((self.x, self.y),
self.xradius, self.yradius),
self.crdmap.offset_pt((self.x, self.y),
-self.xradius, self.yradius))
mpts = numpy.asarray(self.get_data_points(points=points))
if hasattr(self, 'rot_deg'):
xd, yd = self.crdmap.to_data(self.x, self.y)
mpts = trcalc.rotate_coord(mpts, self.rot_deg, [xd, yd])
t_ = mpts.T
x1, y1 = t_[0].min(), t_[1].min()
x2, y2 = t_[0].max(), t_[1].max()
return (x1, y1, x2, y2)
class PolygonMixin(object):
"""Mixin for polygon-based objects.
"""
def __init__(self):
pass
def insert_pt(self, idx, pt):
self.points.insert(idx, pt)
def delete_pt(self, idx):
self.points.pop(idx)
def get_center_pt(self):
# default is geometric average of points
P = numpy.asarray(self.get_data_points())
x = P[:, 0]
y = P[:, 1]
ctr_x = numpy.sum(x) / float(len(x))
ctr_y = numpy.sum(y) / float(len(y))
return ctr_x, ctr_y
def get_llur(self):
points = numpy.asarray(self.get_data_points())
t_ = points.T
x1, y1 = t_[0].min(), t_[1].min()
x2, y2 = t_[0].max(), t_[1].max()
return (x1, y1, x2, y2)
def contains_arr(self, x_arr, y_arr):
# NOTE: we use a version of the ray casting algorithm
# See: http://alienryderflex.com/polygon/
xa, ya = x_arr, y_arr
# promote input arrays dimension cardinality, if necessary
promoted = False
if len(xa.shape) == 1:
xa = xa.reshape(1, -1)
promoted = True
if len(ya.shape) == 1:
ya = ya.reshape(-1, 1)
promoted = True
result = numpy.empty((ya.size, xa.size), dtype=numpy.bool)
result.fill(False)
points = self.get_data_points()
xj, yj = points[-1]
for point in points:
xi, yi = point
tf = numpy.logical_and(
numpy.logical_or(numpy.logical_and(yi < ya, yj >= ya),
numpy.logical_and(yj < ya, yi >= ya)),
numpy.logical_or(xi <= xa, xj <= xa))
# NOTE: get a divide by zero here for some elements whose tf=False
# Need to figure out a way to conditionally do those w/tf=True
# Till then we use the warnings module to suppress the warning.
## with warnings.catch_warnings():
## warnings.simplefilter('default', RuntimeWarning)
# NOTE postscript: warnings context manager causes this computation
# to fail silently sometimes where it previously worked with a
# warning--commenting out the warning manager for now
cross = ((xi + (ya - yi).astype(numpy.float) /
(yj - yi) * (xj - xi)) < xa)
result[tf == True] ^= cross[tf == True]
xj, yj = xi, yi
if promoted:
# de-promote result
result = result[numpy.eye(len(y_arr), len(x_arr), dtype=numpy.bool)]
return result
def contains(self, xp, yp):
x_arr, y_arr = numpy.array([xp]), numpy.array([yp])
res = self.contains_arr(x_arr, y_arr)
return res[0]
def set_edit_point(self, i, pt, detail):
num_points = len(self.points)
if i == 0:
x, y = pt
self.move_to(x, y)
elif i-1 < num_points:
self.set_point_by_index(i-1, pt)
elif i == num_points + 1:
scalef = self.calc_scale_from_pt(pt, detail)
self.rescale_by(scalef, scalef, detail)
elif i == num_points + 2:
delta_deg = self.calc_rotation_from_pt(pt, detail)
self.rerotate_by(delta_deg, detail)
else:
raise ValueError("No point corresponding to index %d" % (i))
def get_edit_points(self, viewer):
move_pt, scale_pt, rotate_pt = self.get_move_scale_rotate_pts(viewer)
points = self.get_data_points()
return [move_pt] + list(points) + [scale_pt, rotate_pt]
def setup_edit(self, detail):
detail.center_pos = self.get_center_pt()
detail.points = self.get_data_points()
#END
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