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239 lines
7.3 KiB
Python
239 lines
7.3 KiB
Python
"""Visualize DesignSpaceDocument and resulting VariationModel."""
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from fontTools.varLib.models import VariationModel, supportScalar
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from fontTools.designspaceLib import DesignSpaceDocument
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from matplotlib import pyplot
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from mpl_toolkits.mplot3d import axes3d
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from itertools import cycle
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import math
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import logging
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import sys
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log = logging.getLogger(__name__)
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def stops(support, count=10):
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a, b, c = support
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return (
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[a + (b - a) * i / count for i in range(count)]
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+ [b + (c - b) * i / count for i in range(count)]
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+ [c]
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)
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def _plotLocationsDots(locations, axes, subplot, **kwargs):
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for loc, color in zip(locations, cycle(pyplot.cm.Set1.colors)):
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if len(axes) == 1:
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subplot.plot([loc.get(axes[0], 0)], [1.0], "o", color=color, **kwargs)
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elif len(axes) == 2:
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subplot.plot(
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[loc.get(axes[0], 0)],
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[loc.get(axes[1], 0)],
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[1.0],
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"o",
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color=color,
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**kwargs,
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)
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else:
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raise AssertionError(len(axes))
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def plotLocations(locations, fig, names=None, **kwargs):
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n = len(locations)
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cols = math.ceil(n**0.5)
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rows = math.ceil(n / cols)
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if names is None:
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names = [None] * len(locations)
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model = VariationModel(locations)
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names = [names[model.reverseMapping[i]] for i in range(len(names))]
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axes = sorted(locations[0].keys())
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if len(axes) == 1:
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_plotLocations2D(model, axes[0], fig, cols, rows, names=names, **kwargs)
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elif len(axes) == 2:
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_plotLocations3D(model, axes, fig, cols, rows, names=names, **kwargs)
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else:
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raise ValueError("Only 1 or 2 axes are supported")
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def _plotLocations2D(model, axis, fig, cols, rows, names, **kwargs):
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subplot = fig.add_subplot(111)
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for i, (support, color, name) in enumerate(
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zip(model.supports, cycle(pyplot.cm.Set1.colors), cycle(names))
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):
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if name is not None:
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subplot.set_title(name)
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subplot.set_xlabel(axis)
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pyplot.xlim(-1.0, +1.0)
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Xs = support.get(axis, (-1.0, 0.0, +1.0))
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X, Y = [], []
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for x in stops(Xs):
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y = supportScalar({axis: x}, support)
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X.append(x)
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Y.append(y)
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subplot.plot(X, Y, color=color, **kwargs)
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_plotLocationsDots(model.locations, [axis], subplot)
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def _plotLocations3D(model, axes, fig, rows, cols, names, **kwargs):
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ax1, ax2 = axes
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axis3D = fig.add_subplot(111, projection="3d")
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for i, (support, color, name) in enumerate(
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zip(model.supports, cycle(pyplot.cm.Set1.colors), cycle(names))
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):
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if name is not None:
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axis3D.set_title(name)
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axis3D.set_xlabel(ax1)
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axis3D.set_ylabel(ax2)
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pyplot.xlim(-1.0, +1.0)
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pyplot.ylim(-1.0, +1.0)
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Xs = support.get(ax1, (-1.0, 0.0, +1.0))
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Ys = support.get(ax2, (-1.0, 0.0, +1.0))
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for x in stops(Xs):
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X, Y, Z = [], [], []
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for y in Ys:
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z = supportScalar({ax1: x, ax2: y}, support)
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X.append(x)
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Y.append(y)
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Z.append(z)
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axis3D.plot(X, Y, Z, color=color, **kwargs)
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for y in stops(Ys):
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X, Y, Z = [], [], []
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for x in Xs:
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z = supportScalar({ax1: x, ax2: y}, support)
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X.append(x)
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Y.append(y)
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Z.append(z)
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axis3D.plot(X, Y, Z, color=color, **kwargs)
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_plotLocationsDots(model.locations, [ax1, ax2], axis3D)
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def plotDocument(doc, fig, **kwargs):
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doc.normalize()
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locations = [s.location for s in doc.sources]
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names = [s.name for s in doc.sources]
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plotLocations(locations, fig, names, **kwargs)
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def _plotModelFromMasters2D(model, masterValues, fig, **kwargs):
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assert len(model.axisOrder) == 1
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axis = model.axisOrder[0]
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axis_min = min(loc.get(axis, 0) for loc in model.locations)
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axis_max = max(loc.get(axis, 0) for loc in model.locations)
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import numpy as np
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X = np.arange(axis_min, axis_max, (axis_max - axis_min) / 100)
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Y = []
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for x in X:
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loc = {axis: x}
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v = model.interpolateFromMasters(loc, masterValues)
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Y.append(v)
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subplot = fig.add_subplot(111)
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subplot.plot(X, Y, "-", **kwargs)
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def _plotModelFromMasters3D(model, masterValues, fig, **kwargs):
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assert len(model.axisOrder) == 2
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axis1, axis2 = model.axisOrder[0], model.axisOrder[1]
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axis1_min = min(loc.get(axis1, 0) for loc in model.locations)
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axis1_max = max(loc.get(axis1, 0) for loc in model.locations)
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axis2_min = min(loc.get(axis2, 0) for loc in model.locations)
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axis2_max = max(loc.get(axis2, 0) for loc in model.locations)
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import numpy as np
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X = np.arange(axis1_min, axis1_max, (axis1_max - axis1_min) / 100)
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Y = np.arange(axis2_min, axis2_max, (axis2_max - axis2_min) / 100)
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X, Y = np.meshgrid(X, Y)
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Z = []
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for row_x, row_y in zip(X, Y):
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z_row = []
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Z.append(z_row)
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for x, y in zip(row_x, row_y):
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loc = {axis1: x, axis2: y}
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v = model.interpolateFromMasters(loc, masterValues)
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z_row.append(v)
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Z = np.array(Z)
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axis3D = fig.add_subplot(111, projection="3d")
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axis3D.plot_surface(X, Y, Z, **kwargs)
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def plotModelFromMasters(model, masterValues, fig, **kwargs):
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"""Plot a variation model and set of master values corresponding
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to the locations to the model into a pyplot figure. Variation
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model must have axisOrder of size 1 or 2."""
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if len(model.axisOrder) == 1:
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_plotModelFromMasters2D(model, masterValues, fig, **kwargs)
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elif len(model.axisOrder) == 2:
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_plotModelFromMasters3D(model, masterValues, fig, **kwargs)
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else:
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raise ValueError("Only 1 or 2 axes are supported")
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def main(args=None):
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from fontTools import configLogger
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if args is None:
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args = sys.argv[1:]
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# configure the library logger (for >= WARNING)
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configLogger()
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# comment this out to enable debug messages from logger
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# log.setLevel(logging.DEBUG)
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if len(args) < 1:
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print("usage: fonttools varLib.plot source.designspace", file=sys.stderr)
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print(" or")
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print("usage: fonttools varLib.plot location1 location2 ...", file=sys.stderr)
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print(" or")
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print(
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"usage: fonttools varLib.plot location1=value1 location2=value2 ...",
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file=sys.stderr,
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)
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sys.exit(1)
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fig = pyplot.figure()
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fig.set_tight_layout(True)
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if len(args) == 1 and args[0].endswith(".designspace"):
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doc = DesignSpaceDocument()
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doc.read(args[0])
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plotDocument(doc, fig)
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else:
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axes = [chr(c) for c in range(ord("A"), ord("Z") + 1)]
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if "=" not in args[0]:
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locs = [dict(zip(axes, (float(v) for v in s.split(",")))) for s in args]
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plotLocations(locs, fig)
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else:
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locations = []
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masterValues = []
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for arg in args:
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loc, v = arg.split("=")
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locations.append(dict(zip(axes, (float(v) for v in loc.split(",")))))
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masterValues.append(float(v))
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model = VariationModel(locations, axes[: len(locations[0])])
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plotModelFromMasters(model, masterValues, fig)
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pyplot.show()
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if __name__ == "__main__":
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import sys
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sys.exit(main())
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