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95 lines
2.6 KiB
95 lines
2.6 KiB
from __future__ import print_function, division, absolute_import |
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from fontTools.misc.py23 import * |
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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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""" |
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def __init__(self, glyphSet): |
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BasePen.__init__(self, glyphSet) |
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self.bounds = None |
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def _moveTo(self, pt): |
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bounds = self.bounds |
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if bounds: |
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self.bounds = updateBounds(bounds, pt) |
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else: |
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x, y = pt |
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self.bounds = (x, y, x, y) |
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def _lineTo(self, pt): |
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self.bounds = updateBounds(self.bounds, pt) |
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def _curveToOne(self, bcp1, bcp2, pt): |
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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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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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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(bounds, calcCubicBounds( |
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self._getCurrentPoint(), bcp1, bcp2, pt)) |
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self.bounds = bounds |
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def _qCurveToOne(self, bcp, pt): |
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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(bounds, calcQuadraticBounds( |
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self._getCurrentPoint(), bcp, pt)) |
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self.bounds = bounds |
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if __name__ == "__main__": |
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def draw(pen): |
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pen.moveTo((0, 0)) |
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pen.lineTo((0, 100)) |
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pen.qCurveTo((50, 75), (60, 50), (50, 25), (0, 0)) |
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pen.curveTo((-50, 25), (-60, 50), (-50, 75), (0, 100)) |
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pen.closePath() |
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pen = ControlBoundsPen(None) |
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draw(pen) |
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print(pen.bounds) |
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pen = BoundsPen(None) |
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draw(pen) |
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print(pen.bounds)
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