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""" Defines utility functions for working with SVG documents in Qt.
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"""
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# System library imports.
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from IPython.external.qt import QtCore, QtGui, QtSvg
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def save_svg(string, parent=None):
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""" Prompts the user to save an SVG document to disk.
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Parameters:
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-----------
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string : basestring
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A Python string containing a SVG document.
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parent : QWidget, optional
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The parent to use for the file dialog.
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Returns:
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--------
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The name of the file to which the document was saved, or None if the save
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was cancelled.
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"""
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if isinstance(string, unicode):
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string = string.encode('utf-8')
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dialog = QtGui.QFileDialog(parent, 'Save SVG Document')
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dialog.setAcceptMode(QtGui.QFileDialog.AcceptSave)
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dialog.setDefaultSuffix('svg')
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dialog.setNameFilter('SVG document (*.svg)')
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if dialog.exec_():
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filename = dialog.selectedFiles()[0]
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f = open(filename, 'w')
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try:
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f.write(string)
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finally:
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f.close()
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return filename
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return None
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def svg_to_clipboard(string):
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""" Copy a SVG document to the clipboard.
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Parameters:
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-----------
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string : basestring
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A Python string containing a SVG document.
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"""
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if isinstance(string, unicode):
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string = string.encode('utf-8')
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mime_data = QtCore.QMimeData()
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mime_data.setData('image/svg+xml', string)
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QtGui.QApplication.clipboard().setMimeData(mime_data)
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def svg_to_image(string, size=None):
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""" Convert a SVG document to a QImage.
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Parameters:
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-----------
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string : basestring
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A Python string containing a SVG document.
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size : QSize, optional
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The size of the image that is produced. If not specified, the SVG
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document's default size is used.
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Raises:
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-------
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ValueError
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If an invalid SVG string is provided.
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Returns:
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--------
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A QImage of format QImage.Format_ARGB32.
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"""
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if isinstance(string, unicode):
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string = string.encode('utf-8')
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renderer = QtSvg.QSvgRenderer(QtCore.QByteArray(string))
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if not renderer.isValid():
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raise ValueError('Invalid SVG data.')
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if size is None:
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size = renderer.defaultSize()
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image = QtGui.QImage(size, QtGui.QImage.Format_ARGB32)
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painter = QtGui.QPainter(image)
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renderer.render(painter)
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return image
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