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Fix barrier label when output='mpl' #13971

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Fix barrier label when output='mpl' #13971

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Fix barrier label when output='mpl'
atharva-satpute Mar 8, 2025
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atharva-satpute Mar 8, 2025
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6 changes: 3 additions & 3 deletions qiskit/visualization/circuit/matplotlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1360,10 +1360,11 @@ def _measure(self, node, node_data, outer_circuit, glob_data):

def _barrier(self, node, node_data, glob_data):
"""Draw a barrier"""
topmost_node = len(node_data[node].q_xy) - 1 if self._reverse_bits else 0
for i, xy in enumerate(node_data[node].q_xy):
xpos, ypos = xy
# For the topmost barrier, reduce the rectangle if there's a label to allow for the text.
if i == 0 and node.op.label is not None:
if i == topmost_node and node.op.label is not None:
ypos_adj = -0.35
else:
ypos_adj = 0.0
Expand All @@ -1388,7 +1389,7 @@ def _barrier(self, node, node_data, glob_data):
self._ax.add_patch(box)

# display the barrier label at the top if there is one
if i == 0 and node.op.label is not None:
if i == topmost_node and node.op.label is not None:
dir_ypos = ypos + 0.65 * HIG
self._ax.text(
xpos,
Expand Down Expand Up @@ -1970,7 +1971,6 @@ def _line(self, xy0, xy1, lc=None, ls=None, zorder=PORDER_LINE):

def _plot_coord(self, x_index, y_index, gate_width, glob_data, flow_op=False):
"""Get the coord positions for an index"""

# Check folding
fold = self._fold if self._fold > 0 else INFINITE_FOLD
h_pos = x_index % fold + 1
Expand Down