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86 lines
2.5 KiB
Python
86 lines
2.5 KiB
Python
5 years ago
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"""
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This module is to support *bbox_inches* option in savefig command.
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"""
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from matplotlib.transforms import Bbox, TransformedBbox, Affine2D
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def adjust_bbox(fig, bbox_inches, fixed_dpi=None):
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"""
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Temporarily adjust the figure so that only the specified area
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(bbox_inches) is saved.
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It modifies fig.bbox, fig.bbox_inches,
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fig.transFigure._boxout, and fig.patch. While the figure size
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changes, the scale of the original figure is conserved. A
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function which restores the original values are returned.
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"""
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origBbox = fig.bbox
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origBboxInches = fig.bbox_inches
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orig_tight_layout = fig.get_tight_layout()
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_boxout = fig.transFigure._boxout
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fig.set_tight_layout(False)
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asp_list = []
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locator_list = []
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for ax in fig.axes:
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pos = ax.get_position(original=False).frozen()
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locator_list.append(ax.get_axes_locator())
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asp_list.append(ax.get_aspect())
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def _l(a, r, pos=pos):
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return pos
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ax.set_axes_locator(_l)
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ax.set_aspect("auto")
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def restore_bbox():
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for ax, asp, loc in zip(fig.axes, asp_list, locator_list):
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ax.set_aspect(asp)
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ax.set_axes_locator(loc)
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fig.bbox = origBbox
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fig.bbox_inches = origBboxInches
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fig.set_tight_layout(orig_tight_layout)
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fig.transFigure._boxout = _boxout
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fig.transFigure.invalidate()
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fig.patch.set_bounds(0, 0, 1, 1)
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if fixed_dpi is not None:
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tr = Affine2D().scale(fixed_dpi)
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dpi_scale = fixed_dpi / fig.dpi
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else:
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tr = Affine2D().scale(fig.dpi)
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dpi_scale = 1.
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_bbox = TransformedBbox(bbox_inches, tr)
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fig.bbox_inches = Bbox.from_bounds(0, 0,
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bbox_inches.width, bbox_inches.height)
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x0, y0 = _bbox.x0, _bbox.y0
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w1, h1 = fig.bbox.width * dpi_scale, fig.bbox.height * dpi_scale
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fig.transFigure._boxout = Bbox.from_bounds(-x0, -y0, w1, h1)
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fig.transFigure.invalidate()
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fig.bbox = TransformedBbox(fig.bbox_inches, tr)
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fig.patch.set_bounds(x0 / w1, y0 / h1,
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fig.bbox.width / w1, fig.bbox.height / h1)
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return restore_bbox
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def process_figure_for_rasterizing(fig, bbox_inches_restore, fixed_dpi=None):
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"""
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This need to be called when figure dpi changes during the drawing
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(e.g., rasterizing). It recovers the bbox and re-adjust it with
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the new dpi.
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"""
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bbox_inches, restore_bbox = bbox_inches_restore
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restore_bbox()
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r = adjust_bbox(fig, bbox_inches, fixed_dpi)
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return bbox_inches, r
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