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548 lines
21 KiB
Python
548 lines
21 KiB
Python
"""
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A layoutgrid is a nrows by ncols set of boxes, meant to be used by
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`._constrained_layout`, each box is analogous to a subplotspec element of
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a gridspec.
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Each box is defined by left[ncols], right[ncols], bottom[nrows] and top[nrows],
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and by two editable margins for each side. The main margin gets its value
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set by the size of ticklabels, titles, etc on each Axes that is in the figure.
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The outer margin is the padding around the Axes, and space for any
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colorbars.
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The "inner" widths and heights of these boxes are then constrained to be the
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same (relative the values of `width_ratios[ncols]` and `height_ratios[nrows]`).
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The layoutgrid is then constrained to be contained within a parent layoutgrid,
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its column(s) and row(s) specified when it is created.
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"""
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import itertools
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import kiwisolver as kiwi
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import logging
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import numpy as np
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import matplotlib as mpl
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import matplotlib.patches as mpatches
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from matplotlib.transforms import Bbox
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_log = logging.getLogger(__name__)
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class LayoutGrid:
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"""
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Analogous to a gridspec, and contained in another LayoutGrid.
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"""
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def __init__(self, parent=None, parent_pos=(0, 0),
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parent_inner=False, name='', ncols=1, nrows=1,
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h_pad=None, w_pad=None, width_ratios=None,
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height_ratios=None):
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Variable = kiwi.Variable
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self.parent_pos = parent_pos
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self.parent_inner = parent_inner
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self.name = name + seq_id()
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if isinstance(parent, LayoutGrid):
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self.name = f'{parent.name}.{self.name}'
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self.nrows = nrows
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self.ncols = ncols
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self.height_ratios = np.atleast_1d(height_ratios)
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if height_ratios is None:
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self.height_ratios = np.ones(nrows)
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self.width_ratios = np.atleast_1d(width_ratios)
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if width_ratios is None:
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self.width_ratios = np.ones(ncols)
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sn = self.name + '_'
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if not isinstance(parent, LayoutGrid):
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# parent can be a rect if not a LayoutGrid
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# allows specifying a rectangle to contain the layout.
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self.solver = kiwi.Solver()
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else:
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parent.add_child(self, *parent_pos)
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self.solver = parent.solver
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# keep track of artist associated w/ this layout. Can be none
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self.artists = np.empty((nrows, ncols), dtype=object)
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self.children = np.empty((nrows, ncols), dtype=object)
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self.margins = {}
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self.margin_vals = {}
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# all the boxes in each column share the same left/right margins:
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for todo in ['left', 'right', 'leftcb', 'rightcb']:
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# track the value so we can change only if a margin is larger
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# than the current value
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self.margin_vals[todo] = np.zeros(ncols)
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sol = self.solver
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self.lefts = [Variable(f'{sn}lefts[{i}]') for i in range(ncols)]
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self.rights = [Variable(f'{sn}rights[{i}]') for i in range(ncols)]
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for todo in ['left', 'right', 'leftcb', 'rightcb']:
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self.margins[todo] = [Variable(f'{sn}margins[{todo}][{i}]')
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for i in range(ncols)]
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for i in range(ncols):
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sol.addEditVariable(self.margins[todo][i], 'strong')
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for todo in ['bottom', 'top', 'bottomcb', 'topcb']:
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self.margins[todo] = np.empty((nrows), dtype=object)
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self.margin_vals[todo] = np.zeros(nrows)
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self.bottoms = [Variable(f'{sn}bottoms[{i}]') for i in range(nrows)]
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self.tops = [Variable(f'{sn}tops[{i}]') for i in range(nrows)]
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for todo in ['bottom', 'top', 'bottomcb', 'topcb']:
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self.margins[todo] = [Variable(f'{sn}margins[{todo}][{i}]')
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for i in range(nrows)]
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for i in range(nrows):
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sol.addEditVariable(self.margins[todo][i], 'strong')
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# set these margins to zero by default. They will be edited as
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# children are filled.
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self.reset_margins()
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self.add_constraints(parent)
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self.h_pad = h_pad
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self.w_pad = w_pad
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def __repr__(self):
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str = f'LayoutBox: {self.name:25s} {self.nrows}x{self.ncols},\n'
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for i in range(self.nrows):
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for j in range(self.ncols):
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str += f'{i}, {j}: '\
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f'L{self.lefts[j].value():1.3f}, ' \
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f'B{self.bottoms[i].value():1.3f}, ' \
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f'R{self.rights[j].value():1.3f}, ' \
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f'T{self.tops[i].value():1.3f}, ' \
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f'ML{self.margins["left"][j].value():1.3f}, ' \
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f'MR{self.margins["right"][j].value():1.3f}, ' \
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f'MB{self.margins["bottom"][i].value():1.3f}, ' \
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f'MT{self.margins["top"][i].value():1.3f}, \n'
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return str
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def reset_margins(self):
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"""
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Reset all the margins to zero. Must do this after changing
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figure size, for instance, because the relative size of the
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axes labels etc changes.
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"""
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for todo in ['left', 'right', 'bottom', 'top',
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'leftcb', 'rightcb', 'bottomcb', 'topcb']:
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self.edit_margins(todo, 0.0)
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def add_constraints(self, parent):
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# define self-consistent constraints
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self.hard_constraints()
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# define relationship with parent layoutgrid:
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self.parent_constraints(parent)
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# define relative widths of the grid cells to each other
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# and stack horizontally and vertically.
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self.grid_constraints()
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def hard_constraints(self):
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"""
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These are the redundant constraints, plus ones that make the
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rest of the code easier.
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"""
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for i in range(self.ncols):
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hc = [self.rights[i] >= self.lefts[i],
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(self.rights[i] - self.margins['right'][i] -
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self.margins['rightcb'][i] >=
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self.lefts[i] - self.margins['left'][i] -
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self.margins['leftcb'][i])
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]
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for c in hc:
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self.solver.addConstraint(c | 'required')
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for i in range(self.nrows):
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hc = [self.tops[i] >= self.bottoms[i],
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(self.tops[i] - self.margins['top'][i] -
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self.margins['topcb'][i] >=
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self.bottoms[i] - self.margins['bottom'][i] -
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self.margins['bottomcb'][i])
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]
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for c in hc:
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self.solver.addConstraint(c | 'required')
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def add_child(self, child, i=0, j=0):
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# np.ix_ returns the cross product of i and j indices
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self.children[np.ix_(np.atleast_1d(i), np.atleast_1d(j))] = child
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def parent_constraints(self, parent):
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# constraints that are due to the parent...
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# i.e. the first column's left is equal to the
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# parent's left, the last column right equal to the
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# parent's right...
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if not isinstance(parent, LayoutGrid):
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# specify a rectangle in figure coordinates
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hc = [self.lefts[0] == parent[0],
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self.rights[-1] == parent[0] + parent[2],
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# top and bottom reversed order...
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self.tops[0] == parent[1] + parent[3],
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self.bottoms[-1] == parent[1]]
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else:
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rows, cols = self.parent_pos
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rows = np.atleast_1d(rows)
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cols = np.atleast_1d(cols)
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left = parent.lefts[cols[0]]
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right = parent.rights[cols[-1]]
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top = parent.tops[rows[0]]
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bottom = parent.bottoms[rows[-1]]
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if self.parent_inner:
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# the layout grid is contained inside the inner
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# grid of the parent.
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left += parent.margins['left'][cols[0]]
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left += parent.margins['leftcb'][cols[0]]
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right -= parent.margins['right'][cols[-1]]
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right -= parent.margins['rightcb'][cols[-1]]
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top -= parent.margins['top'][rows[0]]
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top -= parent.margins['topcb'][rows[0]]
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bottom += parent.margins['bottom'][rows[-1]]
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bottom += parent.margins['bottomcb'][rows[-1]]
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hc = [self.lefts[0] == left,
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self.rights[-1] == right,
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# from top to bottom
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self.tops[0] == top,
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self.bottoms[-1] == bottom]
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for c in hc:
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self.solver.addConstraint(c | 'required')
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def grid_constraints(self):
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# constrain the ratio of the inner part of the grids
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# to be the same (relative to width_ratios)
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# constrain widths:
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w = (self.rights[0] - self.margins['right'][0] -
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self.margins['rightcb'][0])
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w = (w - self.lefts[0] - self.margins['left'][0] -
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self.margins['leftcb'][0])
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w0 = w / self.width_ratios[0]
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# from left to right
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for i in range(1, self.ncols):
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w = (self.rights[i] - self.margins['right'][i] -
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self.margins['rightcb'][i])
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w = (w - self.lefts[i] - self.margins['left'][i] -
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self.margins['leftcb'][i])
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c = (w == w0 * self.width_ratios[i])
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self.solver.addConstraint(c | 'strong')
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# constrain the grid cells to be directly next to each other.
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c = (self.rights[i - 1] == self.lefts[i])
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self.solver.addConstraint(c | 'strong')
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# constrain heights:
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h = self.tops[0] - self.margins['top'][0] - self.margins['topcb'][0]
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h = (h - self.bottoms[0] - self.margins['bottom'][0] -
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self.margins['bottomcb'][0])
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h0 = h / self.height_ratios[0]
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# from top to bottom:
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for i in range(1, self.nrows):
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h = (self.tops[i] - self.margins['top'][i] -
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self.margins['topcb'][i])
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h = (h - self.bottoms[i] - self.margins['bottom'][i] -
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self.margins['bottomcb'][i])
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c = (h == h0 * self.height_ratios[i])
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self.solver.addConstraint(c | 'strong')
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# constrain the grid cells to be directly above each other.
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c = (self.bottoms[i - 1] == self.tops[i])
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self.solver.addConstraint(c | 'strong')
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# Margin editing: The margins are variable and meant to
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# contain things of a fixed size like axes labels, tick labels, titles
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# etc
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def edit_margin(self, todo, size, cell):
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"""
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Change the size of the margin for one cell.
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Parameters
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----------
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todo : string (one of 'left', 'right', 'bottom', 'top')
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margin to alter.
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size : float
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Size of the margin. If it is larger than the existing minimum it
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updates the margin size. Fraction of figure size.
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cell : int
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Cell column or row to edit.
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"""
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self.solver.suggestValue(self.margins[todo][cell], size)
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self.margin_vals[todo][cell] = size
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def edit_margin_min(self, todo, size, cell=0):
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"""
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Change the minimum size of the margin for one cell.
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Parameters
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----------
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todo : string (one of 'left', 'right', 'bottom', 'top')
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margin to alter.
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size : float
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Minimum size of the margin . If it is larger than the
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existing minimum it updates the margin size. Fraction of
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figure size.
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cell : int
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Cell column or row to edit.
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"""
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if size > self.margin_vals[todo][cell]:
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self.edit_margin(todo, size, cell)
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def edit_margins(self, todo, size):
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"""
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Change the size of all the margin of all the cells in the layout grid.
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Parameters
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----------
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todo : string (one of 'left', 'right', 'bottom', 'top')
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margin to alter.
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size : float
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Size to set the margins. Fraction of figure size.
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"""
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for i in range(len(self.margin_vals[todo])):
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self.edit_margin(todo, size, i)
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def edit_all_margins_min(self, todo, size):
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"""
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Change the minimum size of all the margin of all
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the cells in the layout grid.
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Parameters
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----------
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todo : {'left', 'right', 'bottom', 'top'}
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The margin to alter.
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size : float
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Minimum size of the margin. If it is larger than the
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existing minimum it updates the margin size. Fraction of
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figure size.
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"""
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for i in range(len(self.margin_vals[todo])):
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self.edit_margin_min(todo, size, i)
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def edit_outer_margin_mins(self, margin, ss):
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"""
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Edit all four margin minimums in one statement.
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Parameters
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----------
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margin : dict
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size of margins in a dict with keys 'left', 'right', 'bottom',
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'top'
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ss : SubplotSpec
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defines the subplotspec these margins should be applied to
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"""
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self.edit_margin_min('left', margin['left'], ss.colspan.start)
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self.edit_margin_min('leftcb', margin['leftcb'], ss.colspan.start)
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self.edit_margin_min('right', margin['right'], ss.colspan.stop - 1)
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self.edit_margin_min('rightcb', margin['rightcb'], ss.colspan.stop - 1)
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# rows are from the top down:
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self.edit_margin_min('top', margin['top'], ss.rowspan.start)
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self.edit_margin_min('topcb', margin['topcb'], ss.rowspan.start)
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self.edit_margin_min('bottom', margin['bottom'], ss.rowspan.stop - 1)
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self.edit_margin_min('bottomcb', margin['bottomcb'],
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ss.rowspan.stop - 1)
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def get_margins(self, todo, col):
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"""Return the margin at this position"""
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return self.margin_vals[todo][col]
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def get_outer_bbox(self, rows=0, cols=0):
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"""
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Return the outer bounding box of the subplot specs
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given by rows and cols. rows and cols can be spans.
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"""
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rows = np.atleast_1d(rows)
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cols = np.atleast_1d(cols)
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bbox = Bbox.from_extents(
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self.lefts[cols[0]].value(),
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self.bottoms[rows[-1]].value(),
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self.rights[cols[-1]].value(),
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self.tops[rows[0]].value())
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return bbox
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def get_inner_bbox(self, rows=0, cols=0):
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"""
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Return the inner bounding box of the subplot specs
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given by rows and cols. rows and cols can be spans.
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"""
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rows = np.atleast_1d(rows)
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cols = np.atleast_1d(cols)
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bbox = Bbox.from_extents(
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(self.lefts[cols[0]].value() +
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self.margins['left'][cols[0]].value() +
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self.margins['leftcb'][cols[0]].value()),
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(self.bottoms[rows[-1]].value() +
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self.margins['bottom'][rows[-1]].value() +
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self.margins['bottomcb'][rows[-1]].value()),
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(self.rights[cols[-1]].value() -
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self.margins['right'][cols[-1]].value() -
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self.margins['rightcb'][cols[-1]].value()),
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(self.tops[rows[0]].value() -
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self.margins['top'][rows[0]].value() -
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self.margins['topcb'][rows[0]].value())
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)
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return bbox
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def get_bbox_for_cb(self, rows=0, cols=0):
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"""
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Return the bounding box that includes the
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decorations but, *not* the colorbar...
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"""
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rows = np.atleast_1d(rows)
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cols = np.atleast_1d(cols)
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bbox = Bbox.from_extents(
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(self.lefts[cols[0]].value() +
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self.margins['leftcb'][cols[0]].value()),
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(self.bottoms[rows[-1]].value() +
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self.margins['bottomcb'][rows[-1]].value()),
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(self.rights[cols[-1]].value() -
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self.margins['rightcb'][cols[-1]].value()),
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(self.tops[rows[0]].value() -
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self.margins['topcb'][rows[0]].value())
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)
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return bbox
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def get_left_margin_bbox(self, rows=0, cols=0):
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"""
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Return the left margin bounding box of the subplot specs
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given by rows and cols. rows and cols can be spans.
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"""
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rows = np.atleast_1d(rows)
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cols = np.atleast_1d(cols)
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bbox = Bbox.from_extents(
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(self.lefts[cols[0]].value() +
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self.margins['leftcb'][cols[0]].value()),
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(self.bottoms[rows[-1]].value()),
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(self.lefts[cols[0]].value() +
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self.margins['leftcb'][cols[0]].value() +
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self.margins['left'][cols[0]].value()),
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(self.tops[rows[0]].value()))
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return bbox
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def get_bottom_margin_bbox(self, rows=0, cols=0):
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"""
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Return the left margin bounding box of the subplot specs
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given by rows and cols. rows and cols can be spans.
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"""
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rows = np.atleast_1d(rows)
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cols = np.atleast_1d(cols)
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bbox = Bbox.from_extents(
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(self.lefts[cols[0]].value()),
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(self.bottoms[rows[-1]].value() +
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self.margins['bottomcb'][rows[-1]].value()),
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(self.rights[cols[-1]].value()),
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(self.bottoms[rows[-1]].value() +
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self.margins['bottom'][rows[-1]].value() +
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self.margins['bottomcb'][rows[-1]].value()
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))
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return bbox
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def get_right_margin_bbox(self, rows=0, cols=0):
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"""
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Return the left margin bounding box of the subplot specs
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given by rows and cols. rows and cols can be spans.
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"""
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rows = np.atleast_1d(rows)
|
|
cols = np.atleast_1d(cols)
|
|
|
|
bbox = Bbox.from_extents(
|
|
(self.rights[cols[-1]].value() -
|
|
self.margins['right'][cols[-1]].value() -
|
|
self.margins['rightcb'][cols[-1]].value()),
|
|
(self.bottoms[rows[-1]].value()),
|
|
(self.rights[cols[-1]].value() -
|
|
self.margins['rightcb'][cols[-1]].value()),
|
|
(self.tops[rows[0]].value()))
|
|
return bbox
|
|
|
|
def get_top_margin_bbox(self, rows=0, cols=0):
|
|
"""
|
|
Return the left margin bounding box of the subplot specs
|
|
given by rows and cols. rows and cols can be spans.
|
|
"""
|
|
rows = np.atleast_1d(rows)
|
|
cols = np.atleast_1d(cols)
|
|
|
|
bbox = Bbox.from_extents(
|
|
(self.lefts[cols[0]].value()),
|
|
(self.tops[rows[0]].value() -
|
|
self.margins['topcb'][rows[0]].value()),
|
|
(self.rights[cols[-1]].value()),
|
|
(self.tops[rows[0]].value() -
|
|
self.margins['topcb'][rows[0]].value() -
|
|
self.margins['top'][rows[0]].value()))
|
|
return bbox
|
|
|
|
def update_variables(self):
|
|
"""
|
|
Update the variables for the solver attached to this layoutgrid.
|
|
"""
|
|
self.solver.updateVariables()
|
|
|
|
_layoutboxobjnum = itertools.count()
|
|
|
|
|
|
def seq_id():
|
|
"""Generate a short sequential id for layoutbox objects."""
|
|
return '%06d' % next(_layoutboxobjnum)
|
|
|
|
|
|
def plot_children(fig, lg=None, level=0):
|
|
"""Simple plotting to show where boxes are."""
|
|
if lg is None:
|
|
_layoutgrids = fig.get_layout_engine().execute(fig)
|
|
lg = _layoutgrids[fig]
|
|
colors = mpl.rcParams["axes.prop_cycle"].by_key()["color"]
|
|
col = colors[level]
|
|
for i in range(lg.nrows):
|
|
for j in range(lg.ncols):
|
|
bb = lg.get_outer_bbox(rows=i, cols=j)
|
|
fig.add_artist(
|
|
mpatches.Rectangle(bb.p0, bb.width, bb.height, linewidth=1,
|
|
edgecolor='0.7', facecolor='0.7',
|
|
alpha=0.2, transform=fig.transFigure,
|
|
zorder=-3))
|
|
bbi = lg.get_inner_bbox(rows=i, cols=j)
|
|
fig.add_artist(
|
|
mpatches.Rectangle(bbi.p0, bbi.width, bbi.height, linewidth=2,
|
|
edgecolor=col, facecolor='none',
|
|
transform=fig.transFigure, zorder=-2))
|
|
|
|
bbi = lg.get_left_margin_bbox(rows=i, cols=j)
|
|
fig.add_artist(
|
|
mpatches.Rectangle(bbi.p0, bbi.width, bbi.height, linewidth=0,
|
|
edgecolor='none', alpha=0.2,
|
|
facecolor=[0.5, 0.7, 0.5],
|
|
transform=fig.transFigure, zorder=-2))
|
|
bbi = lg.get_right_margin_bbox(rows=i, cols=j)
|
|
fig.add_artist(
|
|
mpatches.Rectangle(bbi.p0, bbi.width, bbi.height, linewidth=0,
|
|
edgecolor='none', alpha=0.2,
|
|
facecolor=[0.7, 0.5, 0.5],
|
|
transform=fig.transFigure, zorder=-2))
|
|
bbi = lg.get_bottom_margin_bbox(rows=i, cols=j)
|
|
fig.add_artist(
|
|
mpatches.Rectangle(bbi.p0, bbi.width, bbi.height, linewidth=0,
|
|
edgecolor='none', alpha=0.2,
|
|
facecolor=[0.5, 0.5, 0.7],
|
|
transform=fig.transFigure, zorder=-2))
|
|
bbi = lg.get_top_margin_bbox(rows=i, cols=j)
|
|
fig.add_artist(
|
|
mpatches.Rectangle(bbi.p0, bbi.width, bbi.height, linewidth=0,
|
|
edgecolor='none', alpha=0.2,
|
|
facecolor=[0.7, 0.2, 0.7],
|
|
transform=fig.transFigure, zorder=-2))
|
|
for ch in lg.children.flat:
|
|
if ch is not None:
|
|
plot_children(fig, ch, level=level+1)
|