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177 lines
4.3 KiB
177 lines
4.3 KiB
from fontTools.pens.basePen import BasePen
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def pointToString(pt):
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return " ".join([str(i) for i in pt])
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class SVGPathPen(BasePen):
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def __init__(self, glyphSet):
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BasePen.__init__(self, glyphSet)
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self._commands = []
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self._lastCommand = None
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self._lastX = None
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self._lastY = None
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def _handleAnchor(self):
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"""
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>>> pen = SVGPathPen(None)
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>>> pen.moveTo((0, 0))
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>>> pen.moveTo((10, 10))
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>>> pen._commands
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['M10 10']
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"""
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if self._lastCommand == "M":
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self._commands.pop(-1)
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def _moveTo(self, pt):
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"""
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>>> pen = SVGPathPen(None)
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>>> pen.moveTo((0, 0))
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>>> pen._commands
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['M0 0']
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>>> pen = SVGPathPen(None)
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>>> pen.moveTo((10, 0))
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>>> pen._commands
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['M10 0']
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>>> pen = SVGPathPen(None)
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>>> pen.moveTo((0, 10))
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>>> pen._commands
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['M0 10']
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"""
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self._handleAnchor()
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t = "M%s" % (pointToString(pt))
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self._commands.append(t)
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self._lastCommand = "M"
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self._lastX, self._lastY = pt
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def _lineTo(self, pt):
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"""
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# duplicate point
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>>> pen = SVGPathPen(None)
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>>> pen.moveTo((10, 10))
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>>> pen.lineTo((10, 10))
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>>> pen._commands
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['M10 10']
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# vertical line
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>>> pen = SVGPathPen(None)
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>>> pen.moveTo((10, 10))
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>>> pen.lineTo((10, 0))
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>>> pen._commands
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['M10 10', 'V0']
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# horizontal line
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>>> pen = SVGPathPen(None)
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>>> pen.moveTo((10, 10))
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>>> pen.lineTo((0, 10))
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>>> pen._commands
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['M10 10', 'H0']
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# basic
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>>> pen = SVGPathPen(None)
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>>> pen.lineTo((70, 80))
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>>> pen._commands
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['L70 80']
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# basic following a moveto
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>>> pen = SVGPathPen(None)
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>>> pen.moveTo((0, 0))
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>>> pen.lineTo((10, 10))
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>>> pen._commands
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['M0 0', ' 10 10']
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"""
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x, y = pt
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# duplicate point
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if x == self._lastX and y == self._lastY:
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return
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# vertical line
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elif x == self._lastX:
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cmd = "V"
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pts = str(y)
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# horizontal line
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elif y == self._lastY:
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cmd = "H"
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pts = str(x)
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# previous was a moveto
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elif self._lastCommand == "M":
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cmd = None
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pts = " " + pointToString(pt)
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# basic
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else:
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cmd = "L"
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pts = pointToString(pt)
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# write the string
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t = ""
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if cmd:
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t += cmd
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self._lastCommand = cmd
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t += pts
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self._commands.append(t)
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# store for future reference
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self._lastX, self._lastY = pt
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def _curveToOne(self, pt1, pt2, pt3):
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"""
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>>> pen = SVGPathPen(None)
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>>> pen.curveTo((10, 20), (30, 40), (50, 60))
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>>> pen._commands
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['C10 20 30 40 50 60']
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"""
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t = "C"
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t += pointToString(pt1) + " "
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t += pointToString(pt2) + " "
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t += pointToString(pt3)
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self._commands.append(t)
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self._lastCommand = "C"
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self._lastX, self._lastY = pt3
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def _qCurveToOne(self, pt1, pt2):
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"""
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>>> pen = SVGPathPen(None)
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>>> pen.qCurveTo((10, 20), (30, 40))
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>>> pen._commands
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['Q10 20 30 40']
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"""
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assert pt2 is not None
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t = "Q"
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t += pointToString(pt1) + " "
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t += pointToString(pt2)
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self._commands.append(t)
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self._lastCommand = "Q"
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self._lastX, self._lastY = pt2
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def _closePath(self):
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"""
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>>> pen = SVGPathPen(None)
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>>> pen.closePath()
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>>> pen._commands
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['Z']
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"""
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self._commands.append("Z")
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self._lastCommand = "Z"
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self._lastX = self._lastY = None
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def _endPath(self):
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"""
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>>> pen = SVGPathPen(None)
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>>> pen.endPath()
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>>> pen._commands
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['Z']
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"""
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self._closePath()
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self._lastCommand = None
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self._lastX = self._lastY = None
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def getCommands(self):
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return "".join(self._commands)
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if __name__ == "__main__":
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import sys
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import doctest
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sys.exit(doctest.testmod().failed)
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