def renderTo(self, plot, dest):
"""
Render a plot to a file
Supported formats are:
- pdf: Portable Document Format PDF
- ps: Postcript
- svg: Scalable Vector Graphics SVG
- all image formats supported by Qt, see QImageWriter.supportedImageFormats()
Scalable vector graphic formats like PDF or SVG are superior to
raster graphics formats.
:param qwt.plot.QwtPlot plot: Plot widget
:param dest: QPaintDevice, QPrinter or QSvgGenerator instance
.. seealso::
:py:meth:`render()`,
:py:meth:`qwt.painter.QwtPainter.setRoundingAlignment()`
"""
if isinstance(dest, QPaintDevice):
w = dest.width()
h = dest.height()
rect = QRectF(0, 0, w, h)
elif isinstance(dest, QPrinter):
w = dest.width()
h = dest.height()
rect = QRectF(0, 0, w, h)
aspect = rect.width() / rect.height()
if aspect < 1.0:
rect.setHeight(aspect * rect.width())
elif isinstance(dest, QSvgGenerator):
rect = dest.viewBoxF()
if rect.isEmpty():
rect.setRect(0, 0, dest.width(), dest.height())
if rect.isEmpty():
rect.setRect(0, 0, 800, 600)
else:
raise TypeError("Unsupported destination type %s" % type(dest))
p = QPainter(dest)
self.render(plot, p, rect)
