# Copyright 2021 Huawei Technologies Co., Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ============================================================================
"""Method to draw a qubit topology."""
# pylint: disable=too-few-public-methods,too-many-arguments
from typing import Dict
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.patches import Circle as PltCircle
from matplotlib.patches import Rectangle as PltRectangle
from ...core.circuit import Circuit
from ...device import QubitNode, QubitsTopology
from ._config import _topology_default_style
from .circuit_svg_drawer import Circle, Line, Rect, SVGContainer, Text, box, super_align
def _ext_edges(circ: Circuit):
out = []
for g in circ:
all_qubits = g.obj_qubits + g.ctrl_qubits
all_qubits.sort()
if len(all_qubits) == 2:
out.append((all_qubits[0], all_qubits[1]))
elif len(all_qubits) > 2:
raise ValueError(f"gate {g} too big, need to do decomposition first.")
return set(out)
class SVGQNode(SVGContainer):
"""Qubit node on topology svg graph."""
def __init__(self, qnode: QubitNode, svg_config):
"""Initialize a svg qubit node."""
super().__init__()
q_circle = Circle(0, 0, svg_config['r']).fill(qnode.color)
q_id = Text(0, 0, str(qnode.qubit_id)).fill(svg_config['id_color']).font_size(svg_config['id_fs'])
self.add(q_circle)
self.add(q_id)
self.shift(qnode.poi_x * svg_config['f'], qnode.poi_y * svg_config['f'])
# pylint: disable=too-many-locals
[文档]def draw_topology(
topo: QubitsTopology,
circuit: Circuit = None,
style: Dict = None,
):
"""
Draw a qubit topology as a svg picture.
Args:
topo (:class:`.device.QubitsTopology`): The qubit topology.
circuit (:class:`~.core.circuit.Circuit`): The given quantum circuit you want to execute on
given qubit topology. Default: ``None``.
style (Dict): The picture style configuration. Default: ``None``.
"""
if style is None:
style = _topology_default_style
f = style['f']
if circuit is None:
selected = []
else:
selected = _ext_edges(circ=circuit)
for q1, q2 in selected:
if not topo.is_coupled_with(q1, q2):
raise RuntimeError(f"Failed to execute circuit: qubit {q1} is not coupled with {q2}.")
qubits_view = SVGContainer()
for q_id in topo.all_qubit_id():
qubits_view.add(SVGQNode(topo[q_id], style))
edges_view = SVGContainer()
edge_color = {}
for edge in topo.edges_with_id():
color = topo.get_edge_color(*edge)
edge_color[edge] = style['couple_color'] if color is None else color
for id1, id2 in topo.edges_with_id():
q1, q2 = topo[id1], topo[id2]
x1, y1 = q1.poi_x, q1.poi_y
x2, y2 = q2.poi_x, q2.poi_y
line = Line(x1 * f, x2 * f, y1 * f, y2 * f)
color = edge_color.get((id1, id2), style['couple_color'])
if (id1, id2) in selected or (id2, id1) in selected:
color = style['selected_edge_c']
line.stroke(color).stroke_width(style['couple_w'])
edges_view.add(line)
qubits_box = box(qubits_view)
background = Rect(0, 0, qubits_box['width'], qubits_box['height'])
background.fill("#ffffff")
super_align(background, qubits_view, 'middle', 'middle', 'h')
super_align(background, qubits_view, 'middle', 'middle', 'v')
new_q_box = box(qubits_view)
edges_view.shift(new_q_box['left'] - qubits_box['left'], new_q_box['top'] - qubits_box['top'])
view = SVGContainer()
view.add(background)
view.add(edges_view)
view.add(qubits_view)
return view
class PltQNode:
"""QNode in matplotlib."""
def __init__(self, qnode: QubitNode, ax, svg_config):
"""Construct a qnode."""
x = qnode.poi_x * svg_config['f']
y = -qnode.poi_y * svg_config['f']
c = PltCircle((x, y), svg_config['r'], facecolor=qnode.color)
ax.add_patch(c)
ax.text(
x,
y,
str(qnode.qubit_id),
ha='center',
va='center',
color=svg_config['id_color'],
fontsize=svg_config['id_fs'],
)
class PltLine:
"""Line object in matplotlib."""
def __init__(self, x1, x2, y1, y2, color, w, ax):
"""Construct a line object."""
y1, y2 = -y1, -y2
c = (x2 - x1) + 1j * (y2 - y1)
ang = np.angle(c)
h = w
w = np.abs(c)
v = h / 2 * np.exp(1j * (ang - np.pi / 2))
corner = x1 + 1j * y1 + v
real_x = corner.real
real_y = corner.imag
rect = PltRectangle((real_x, real_y), w, h, facecolor=color, angle=ang / np.pi * 180)
ax.add_patch(rect)
# pylint: disable=too-many-locals
[文档]def draw_topology_plt(
topo: QubitsTopology,
circuit: Circuit = None,
style: Dict = None,
):
"""
Draw a qubit topology with matplotlib.
Args:
topo (:class:`.device.QubitsTopology`): The qubit topology.
circuit (:class:`~.core.circuit.Circuit`): The given quantum circuit you want to execute on
given qubit topology. Default: ``None``.
style (Dict): The picture style configuration. Default: ``None``.
"""
if style is None:
style = _topology_default_style
f = style['f']
if circuit is None:
selected = []
else:
selected = _ext_edges(circ=circuit)
for q1, q2 in selected:
if not topo.is_coupled_with(q1, q2):
raise RuntimeError(f"Failed to execute circuit: qubit {q1} is not coupled with {q2}.")
_, ax = plt.subplots()
edge_color = {}
for edge in topo.edges_with_id():
color = topo.get_edge_color(*edge)
edge_color[edge] = style['couple_color'] if color is None else color
for id1, id2 in topo.edges_with_id():
q1, q2 = topo[id1], topo[id2]
x1, y1 = q1.poi_x, q1.poi_y
x2, y2 = q2.poi_x, q2.poi_y
color = edge_color.get((id1, id2), style['couple_color'])
if (id1, id2) in selected or (id2, id1) in selected:
color = style['selected_edge_c']
PltLine(x1 * f, x2 * f, y1 * f, y2 * f, color, style['couple_w'], ax)
for q_id in topo.all_qubit_id():
PltQNode(topo[q_id], ax, style)
ax.set_axis_off()
ax.axis('equal')
plt.show()