94 lines
3.5 KiB
Python
94 lines
3.5 KiB
Python
#Copyright ReportLab Europe Ltd. 2000-2004
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#see license.txt for license details
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#history http://www.reportlab.co.uk/cgi-bin/viewcvs.cgi/public/reportlab/trunk/reportlab/pdfgen/pathobject.py
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__version__=''' $Id$ '''
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__doc__="""
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PDFPathObject is an efficient way to draw paths on a Canvas. Do not
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instantiate directly, obtain one from the Canvas instead.
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Progress Reports:
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8.83, 2000-01-13, gmcm:
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created from pdfgen.py
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"""
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import string
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from reportlab.pdfgen import pdfgeom
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from reportlab.lib.utils import fp_str
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class PDFPathObject:
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"""Represents a graphic path. There are certain 'modes' to PDF
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drawing, and making a separate object to expose Path operations
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ensures they are completed with no run-time overhead. Ask
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the Canvas for a PDFPath with getNewPathObject(); moveto/lineto/
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curveto wherever you want; add whole shapes; and then add it back
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into the canvas with one of the relevant operators.
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Path objects are probably not long, so we pack onto one line"""
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def __init__(self):
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self._code = []
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self._code.append('n') #newpath
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def getCode(self):
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"pack onto one line; used internally"
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return string.join(self._code, ' ')
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def moveTo(self, x, y):
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self._code.append('%s m' % fp_str(x,y))
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def lineTo(self, x, y):
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self._code.append('%s l' % fp_str(x,y))
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def curveTo(self, x1, y1, x2, y2, x3, y3):
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self._code.append('%s c' % fp_str(x1, y1, x2, y2, x3, y3))
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def arc(self, x1,y1, x2,y2, startAng=0, extent=90):
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"""Contributed to piddlePDF by Robert Kern, 28/7/99.
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Draw a partial ellipse inscribed within the rectangle x1,y1,x2,y2,
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starting at startAng degrees and covering extent degrees. Angles
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start with 0 to the right (+x) and increase counter-clockwise.
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These should have x1<x2 and y1<y2.
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The algorithm is an elliptical generalization of the formulae in
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Jim Fitzsimmon's TeX tutorial <URL: http://www.tinaja.com/bezarc1.pdf>."""
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pointList = pdfgeom.bezierArc(x1,y1, x2,y2, startAng, extent)
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#move to first point
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self._code.append('%s m' % fp_str(pointList[0][:2]))
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for curve in pointList:
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self._code.append('%s c' % fp_str(curve[2:]))
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def arcTo(self, x1,y1, x2,y2, startAng=0, extent=90):
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"""Like arc, but draws a line from the current point to
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the start if the start is not the current point."""
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pointList = pdfgeom.bezierArc(x1,y1, x2,y2, startAng, extent)
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self._code.append('%s l' % fp_str(pointList[0][:2]))
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for curve in pointList:
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self._code.append('%s c' % fp_str(curve[2:]))
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def rect(self, x, y, width, height):
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"""Adds a rectangle to the path"""
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self._code.append('%s re' % fp_str((x, y, width, height)))
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def ellipse(self, x, y, width, height):
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"""adds an ellipse to the path"""
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pointList = pdfgeom.bezierArc(x, y, x + width,y + height, 0, 360)
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self._code.append('%s m' % fp_str(pointList[0][:2]))
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for curve in pointList:
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self._code.append('%s c' % fp_str(curve[2:]))
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def circle(self, x_cen, y_cen, r):
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"""adds a circle to the path"""
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x1 = x_cen - r
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#x2 = x_cen + r
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y1 = y_cen - r
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#y2 = y_cen + r
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width = height = 2*r
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#self.ellipse(x_cen - r, y_cen - r, x_cen + r, y_cen + r)
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self.ellipse(x1, y1, width, height)
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def close(self):
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"draws a line back to where it started"
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self._code.append('h')
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