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