99 lines
3.1 KiB
Python
99 lines
3.1 KiB
Python
from fontTools.misc.arrayTools import updateBounds, pointInRect, unionRect
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from fontTools.misc.bezierTools import calcCubicBounds, calcQuadraticBounds
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from fontTools.pens.basePen import BasePen
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__all__ = ["BoundsPen", "ControlBoundsPen"]
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class ControlBoundsPen(BasePen):
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"""Pen to calculate the "control bounds" of a shape. This is the
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bounding box of all control points, so may be larger than the
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actual bounding box if there are curves that don't have points
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on their extremes.
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When the shape has been drawn, the bounds are available as the
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``bounds`` attribute of the pen object. It's a 4-tuple::
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(xMin, yMin, xMax, yMax).
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If ``ignoreSinglePoints`` is True, single points are ignored.
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"""
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def __init__(self, glyphSet, ignoreSinglePoints=False):
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BasePen.__init__(self, glyphSet)
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self.ignoreSinglePoints = ignoreSinglePoints
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self.init()
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def init(self):
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self.bounds = None
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self._start = None
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def _moveTo(self, pt):
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self._start = pt
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if not self.ignoreSinglePoints:
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self._addMoveTo()
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def _addMoveTo(self):
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if self._start is None:
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return
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bounds = self.bounds
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if bounds:
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self.bounds = updateBounds(bounds, self._start)
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else:
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x, y = self._start
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self.bounds = (x, y, x, y)
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self._start = None
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def _lineTo(self, pt):
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self._addMoveTo()
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self.bounds = updateBounds(self.bounds, pt)
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def _curveToOne(self, bcp1, bcp2, pt):
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self._addMoveTo()
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bounds = self.bounds
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bounds = updateBounds(bounds, bcp1)
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bounds = updateBounds(bounds, bcp2)
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bounds = updateBounds(bounds, pt)
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self.bounds = bounds
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def _qCurveToOne(self, bcp, pt):
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self._addMoveTo()
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bounds = self.bounds
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bounds = updateBounds(bounds, bcp)
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bounds = updateBounds(bounds, pt)
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self.bounds = bounds
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class BoundsPen(ControlBoundsPen):
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"""Pen to calculate the bounds of a shape. It calculates the
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correct bounds even when the shape contains curves that don't
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have points on their extremes. This is somewhat slower to compute
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than the "control bounds".
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When the shape has been drawn, the bounds are available as the
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``bounds`` attribute of the pen object. It's a 4-tuple::
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(xMin, yMin, xMax, yMax)
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"""
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def _curveToOne(self, bcp1, bcp2, pt):
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self._addMoveTo()
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bounds = self.bounds
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bounds = updateBounds(bounds, pt)
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if not pointInRect(bcp1, bounds) or not pointInRect(bcp2, bounds):
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bounds = unionRect(
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bounds, calcCubicBounds(self._getCurrentPoint(), bcp1, bcp2, pt)
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)
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self.bounds = bounds
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def _qCurveToOne(self, bcp, pt):
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self._addMoveTo()
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bounds = self.bounds
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bounds = updateBounds(bounds, pt)
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if not pointInRect(bcp, bounds):
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bounds = unionRect(
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bounds, calcQuadraticBounds(self._getCurrentPoint(), bcp, pt)
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)
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self.bounds = bounds
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