Source code for mpl_toolkits.mplot3d.axis3d

# axis3d.py, original mplot3d version by John Porter
# Created: 23 Sep 2005
# Parts rewritten by Reinier Heeres <[email protected]>

import numpy as np

import matplotlib.transforms as mtransforms
from matplotlib import (
    artist, lines as mlines, axis as maxis, patches as mpatches, rcParams)
from . import art3d, proj3d


def move_from_center(coord, centers, deltas, axmask=(True, True, True)):
    """
    For each coordinate where *axmask* is True, move *coord* away from
    *centers* by *deltas*.
    """
    coord = np.asarray(coord)
    return coord + axmask * np.copysign(1, coord - centers) * deltas


def tick_update_position(tick, tickxs, tickys, labelpos):
    """Update tick line and label position and style."""

    tick.label1.set_position(labelpos)
    tick.label2.set_position(labelpos)
    tick.tick1line.set_visible(True)
    tick.tick2line.set_visible(False)
    tick.tick1line.set_linestyle('-')
    tick.tick1line.set_marker('')
    tick.tick1line.set_data(tickxs, tickys)
    tick.gridline.set_data(0, 0)


[docs]class Axis(maxis.XAxis): """An Axis class for the 3D plots.""" # These points from the unit cube make up the x, y and z-planes _PLANES = ( (0, 3, 7, 4), (1, 2, 6, 5), # yz planes (0, 1, 5, 4), (3, 2, 6, 7), # xz planes (0, 1, 2, 3), (4, 5, 6, 7), # xy planes ) # Some properties for the axes _AXINFO = { 'x': {'i': 0, 'tickdir': 1, 'juggled': (1, 0, 2), 'color': (0.95, 0.95, 0.95, 0.5)}, 'y': {'i': 1, 'tickdir': 0, 'juggled': (0, 1, 2), 'color': (0.90, 0.90, 0.90, 0.5)}, 'z': {'i': 2, 'tickdir': 0, 'juggled': (0, 2, 1), 'color': (0.925, 0.925, 0.925, 0.5)}, }
[docs] def __init__(self, adir, v_intervalx, d_intervalx, axes, *args, rotate_label=None, **kwargs): # adir identifies which axes this is self.adir = adir # This is a temporary member variable. # Do not depend on this existing in future releases! self._axinfo = self._AXINFO[adir].copy() if rcParams['_internal.classic_mode']: self._axinfo.update({ 'label': {'va': 'center', 'ha': 'center'}, 'tick': { 'inward_factor': 0.2, 'outward_factor': 0.1, 'linewidth': { True: rcParams['lines.linewidth'], # major False: rcParams['lines.linewidth'], # minor } }, 'axisline': {'linewidth': 0.75, 'color': (0, 0, 0, 1)}, 'grid': { 'color': (0.9, 0.9, 0.9, 1), 'linewidth': 1.0, 'linestyle': '-', }, }) else: self._axinfo.update({ 'label': {'va': 'center', 'ha': 'center'}, 'tick': { 'inward_factor': 0.2, 'outward_factor': 0.1, 'linewidth': { True: ( # major rcParams['xtick.major.width'] if adir in 'xz' else rcParams['ytick.major.width']), False: ( # minor rcParams['xtick.minor.width'] if adir in 'xz' else rcParams['ytick.minor.width']), } }, 'axisline': { 'linewidth': rcParams['axes.linewidth'], 'color': rcParams['axes.edgecolor'], }, 'grid': { 'color': rcParams['grid.color'], 'linewidth': rcParams['grid.linewidth'], 'linestyle': rcParams['grid.linestyle'], }, }) super().__init__(axes, *args, **kwargs) # data and viewing intervals for this direction self.d_interval = d_intervalx self.v_interval = v_intervalx self.set_rotate_label(rotate_label)
[docs] def init3d(self): self.line = mlines.Line2D( xdata=(0, 0), ydata=(0, 0), linewidth=self._axinfo['axisline']['linewidth'], color=self._axinfo['axisline']['color'], antialiased=True) # Store dummy data in Polygon object self.pane = mpatches.Polygon( np.array([[0, 0], [0, 1], [1, 0], [0, 0]]), closed=False, alpha=0.8, facecolor='k', edgecolor='k') self.set_pane_color(self._axinfo['color']) self.axes._set_artist_props(self.line) self.axes._set_artist_props(self.pane) self.gridlines = art3d.Line3DCollection([]) self.axes._set_artist_props(self.gridlines) self.axes._set_artist_props(self.label) self.axes._set_artist_props(self.offsetText) # Need to be able to place the label at the correct location self.label._transform = self.axes.transData self.offsetText._transform = self.axes.transData
[docs] def get_major_ticks(self, numticks=None): ticks = super().get_major_ticks(numticks) for t in ticks: for obj in [ t.tick1line, t.tick2line, t.gridline, t.label1, t.label2]: obj.set_transform(self.axes.transData) return ticks
[docs] def get_minor_ticks(self, numticks=None): ticks = super().get_minor_ticks(numticks) for t in ticks: for obj in [ t.tick1line, t.tick2line, t.gridline, t.label1, t.label2]: obj.set_transform(self.axes.transData) return ticks
[docs] def set_pane_pos(self, xys): xys = np.asarray(xys) xys = xys[:, :2] self.pane.xy = xys self.stale = True
[docs] def set_pane_color(self, color): """Set pane color to a RGBA tuple.""" self._axinfo['color'] = color self.pane.set_edgecolor(color) self.pane.set_facecolor(color) self.pane.set_alpha(color[-1]) self.stale = True
[docs] def set_rotate_label(self, val): """ Whether to rotate the axis label: True, False or None. If set to None the label will be rotated if longer than 4 chars. """ self._rotate_label = val self.stale = True
[docs] def get_rotate_label(self, text): if self._rotate_label is not None: return self._rotate_label else: return len(text) > 4
def _get_coord_info(self, renderer): mins, maxs = np.array([ self.axes.get_xbound(), self.axes.get_ybound(), self.axes.get_zbound(), ]).T centers = (maxs + mins) / 2. deltas = (maxs - mins) / 12. mins = mins - deltas / 4. maxs = maxs + deltas / 4. vals = mins[0], maxs[0], mins[1], maxs[1], mins[2], maxs[2] tc = self.axes.tunit_cube(vals, self.axes.M) avgz = [tc[p1][2] + tc[p2][2] + tc[p3][2] + tc[p4][2] for p1, p2, p3, p4 in self._PLANES] highs = np.array([avgz[2*i] < avgz[2*i+1] for i in range(3)]) return mins, maxs, centers, deltas, tc, highs
[docs] def draw_pane(self, renderer): renderer.open_group('pane3d', gid=self.get_gid()) mins, maxs, centers, deltas, tc, highs = self._get_coord_info(renderer) info = self._axinfo index = info['i'] if not highs[index]: plane = self._PLANES[2 * index] else: plane = self._PLANES[2 * index + 1] xys = [tc[p] for p in plane] self.set_pane_pos(xys) self.pane.draw(renderer) renderer.close_group('pane3d')
[docs] @artist.allow_rasterization def draw(self, renderer): self.label._transform = self.axes.transData renderer.open_group('axis3d', gid=self.get_gid()) ticks = self._update_ticks() info = self._axinfo index = info['i'] mins, maxs, centers, deltas, tc, highs = self._get_coord_info(renderer) # Determine grid lines minmax = np.where(highs, maxs, mins) maxmin = np.where(highs, mins, maxs) # Draw main axis line juggled = info['juggled'] edgep1 = minmax.copy() edgep1[juggled[0]] = maxmin[juggled[0]] edgep2 = edgep1.copy() edgep2[juggled[1]] = maxmin[juggled[1]] pep = np.asarray( proj3d.proj_trans_points([edgep1, edgep2], self.axes.M)) centpt = proj3d.proj_transform(*centers, self.axes.M) self.line.set_data(pep[0], pep[1]) self.line.draw(renderer) # Grid points where the planes meet xyz0 = np.tile(minmax, (len(ticks), 1)) xyz0[:, index] = [tick.get_loc() for tick in ticks] # Draw labels # The transAxes transform is used because the Text object # rotates the text relative to the display coordinate system. # Therefore, if we want the labels to remain parallel to the # axis regardless of the aspect ratio, we need to convert the # edge points of the plane to display coordinates and calculate # an angle from that. # TODO: Maybe Text objects should handle this themselves? dx, dy = (self.axes.transAxes.transform([pep[0:2, 1]]) - self.axes.transAxes.transform([pep[0:2, 0]]))[0] lxyz = 0.5 * (edgep1 + edgep2) # A rough estimate; points are ambiguous since 3D plots rotate reltoinches = self.figure.dpi_scale_trans.inverted() ax_inches = reltoinches.transform(self.axes.bbox.size) ax_points_estimate = sum(72. * ax_inches) deltas_per_point = 48 / ax_points_estimate default_offset = 21. labeldeltas = ( (self.labelpad + default_offset) * deltas_per_point * deltas) axmask = [True, True, True] axmask[index] = False lxyz = move_from_center(lxyz, centers, labeldeltas, axmask) tlx, tly, tlz = proj3d.proj_transform(*lxyz, self.axes.M) self.label.set_position((tlx, tly)) if self.get_rotate_label(self.label.get_text()): angle = art3d._norm_text_angle(np.rad2deg(np.arctan2(dy, dx))) self.label.set_rotation(angle) self.label.set_va(info['label']['va']) self.label.set_ha(info['label']['ha']) self.label.draw(renderer) # Draw Offset text # Which of the two edge points do we want to # use for locating the offset text? if juggled[2] == 2: outeredgep = edgep1 outerindex = 0 else: outeredgep = edgep2 outerindex = 1 pos = move_from_center(outeredgep, centers, labeldeltas, axmask) olx, oly, olz = proj3d.proj_transform(*pos, self.axes.M) self.offsetText.set_text(self.major.formatter.get_offset()) self.offsetText.set_position((olx, oly)) angle = art3d._norm_text_angle(np.rad2deg(np.arctan2(dy, dx))) self.offsetText.set_rotation(angle) # Must set rotation mode to "anchor" so that # the alignment point is used as the "fulcrum" for rotation. self.offsetText.set_rotation_mode('anchor') #---------------------------------------------------------------------- # Note: the following statement for determining the proper alignment of # the offset text. This was determined entirely by trial-and-error # and should not be in any way considered as "the way". There are # still some edge cases where alignment is not quite right, but this # seems to be more of a geometry issue (in other words, I might be # using the wrong reference points). # # (TT, FF, TF, FT) are the shorthand for the tuple of # (centpt[info['tickdir']] <= pep[info['tickdir'], outerindex], # centpt[index] <= pep[index, outerindex]) # # Three-letters (e.g., TFT, FTT) are short-hand for the array of bools # from the variable 'highs'. # --------------------------------------------------------------------- if centpt[info['tickdir']] > pep[info['tickdir'], outerindex]: # if FT and if highs has an even number of Trues if (centpt[index] <= pep[index, outerindex] and np.count_nonzero(highs) % 2 == 0): # Usually, this means align right, except for the FTT case, # in which offset for axis 1 and 2 are aligned left. if highs.tolist() == [False, True, True] and index in (1, 2): align = 'left' else: align = 'right' else: # The FF case align = 'left' else: # if TF and if highs has an even number of Trues if (centpt[index] > pep[index, outerindex] and np.count_nonzero(highs) % 2 == 0): # Usually mean align left, except if it is axis 2 if index == 2: align = 'right' else: align = 'left' else: # The TT case align = 'right' self.offsetText.set_va('center') self.offsetText.set_ha(align) self.offsetText.draw(renderer) if self.axes._draw_grid and len(ticks): # Grid lines go from the end of one plane through the plane # intersection (at xyz0) to the end of the other plane. The first # point (0) differs along dimension index-2 and the last (2) along # dimension index-1. lines = np.stack([xyz0, xyz0, xyz0], axis=1) lines[:, 0, index - 2] = maxmin[index - 2] lines[:, 2, index - 1] = maxmin[index - 1] self.gridlines.set_segments(lines) self.gridlines.set_color(info['grid']['color']) self.gridlines.set_linewidth(info['grid']['linewidth']) self.gridlines.set_linestyle(info['grid']['linestyle']) self.gridlines.do_3d_projection() self.gridlines.draw(renderer) # Draw ticks tickdir = info['tickdir'] tickdelta = deltas[tickdir] if highs[tickdir]: ticksign = 1 else: ticksign = -1 for tick in ticks: # Get tick line positions pos = edgep1.copy() pos[index] = tick.get_loc() pos[tickdir] = ( edgep1[tickdir] + info['tick']['outward_factor'] * ticksign * tickdelta) x1, y1, z1 = proj3d.proj_transform(*pos, self.axes.M) pos[tickdir] = ( edgep1[tickdir] - info['tick']['inward_factor'] * ticksign * tickdelta) x2, y2, z2 = proj3d.proj_transform(*pos, self.axes.M) # Get position of label default_offset = 8. # A rough estimate labeldeltas = ( (tick.get_pad() + default_offset) * deltas_per_point * deltas) axmask = [True, True, True] axmask[index] = False pos[tickdir] = edgep1[tickdir] pos = move_from_center(pos, centers, labeldeltas, axmask) lx, ly, lz = proj3d.proj_transform(*pos, self.axes.M) tick_update_position(tick, (x1, x2), (y1, y2), (lx, ly)) tick.tick1line.set_linewidth( info['tick']['linewidth'][tick._major]) tick.draw(renderer) renderer.close_group('axis3d') self.stale = False
# TODO: Get this to work (more) properly when mplot3d supports the # transforms framework.
[docs] def get_tightbbox(self, renderer, *, for_layout_only=False): # inherited docstring if not self.get_visible(): return # We have to directly access the internal data structures # (and hope they are up to date) because at draw time we # shift the ticks and their labels around in (x, y) space # based on the projection, the current view port, and their # position in 3D space. If we extend the transforms framework # into 3D we would not need to do this different book keeping # than we do in the normal axis major_locs = self.get_majorticklocs() minor_locs = self.get_minorticklocs() ticks = [*self.get_minor_ticks(len(minor_locs)), *self.get_major_ticks(len(major_locs))] view_low, view_high = self.get_view_interval() if view_low > view_high: view_low, view_high = view_high, view_low interval_t = self.get_transform().transform([view_low, view_high]) ticks_to_draw = [] for tick in ticks: try: loc_t = self.get_transform().transform(tick.get_loc()) except AssertionError: # Transform.transform doesn't allow masked values but # some scales might make them, so we need this try/except. pass else: if mtransforms._interval_contains_close(interval_t, loc_t): ticks_to_draw.append(tick) ticks = ticks_to_draw bb_1, bb_2 = self._get_tick_bboxes(ticks, renderer) other = [] if self.line.get_visible(): other.append(self.line.get_window_extent(renderer)) if (self.label.get_visible() and not for_layout_only and self.label.get_text()): other.append(self.label.get_window_extent(renderer)) return mtransforms.Bbox.union([*bb_1, *bb_2, *other])
@property def d_interval(self): return self.get_data_interval() @d_interval.setter def d_interval(self, minmax): self.set_data_interval(*minmax) @property def v_interval(self): return self.get_view_interval() @v_interval.setter def v_interval(self, minmax): self.set_view_interval(*minmax)
# Use classes to look at different data limits class XAxis(Axis): get_view_interval, set_view_interval = maxis._make_getset_interval( "view", "xy_viewLim", "intervalx") get_data_interval, set_data_interval = maxis._make_getset_interval( "data", "xy_dataLim", "intervalx") class YAxis(Axis): get_view_interval, set_view_interval = maxis._make_getset_interval( "view", "xy_viewLim", "intervaly") get_data_interval, set_data_interval = maxis._make_getset_interval( "data", "xy_dataLim", "intervaly") class ZAxis(Axis): get_view_interval, set_view_interval = maxis._make_getset_interval( "view", "zz_viewLim", "intervalx") get_data_interval, set_data_interval = maxis._make_getset_interval( "data", "zz_dataLim", "intervalx")